U.S. patent application number 17/742990 was filed with the patent office on 2022-08-25 for surface treatment device.
The applicant listed for this patent is HONDA MOTOR CO., LTD.. Invention is credited to Yuki Furukawa, Tatsuya Sasaki, Masahiro Yamanaka.
Application Number | 20220267922 17/742990 |
Document ID | / |
Family ID | |
Filed Date | 2022-08-25 |
United States Patent
Application |
20220267922 |
Kind Code |
A1 |
Furukawa; Yuki ; et
al. |
August 25, 2022 |
SURFACE TREATMENT DEVICE
Abstract
A surface treatment device utilizes an electrode device. The
electrode device is provided with a closed part facing a bottom
part of a bottomed hole when inserted inside the bottomed hole, and
a flow through hole linking the inside and outside of the electrode
device is formed in the electrode device. When surface treatment is
implemented on the inner wall surface of the bottomed hole, the
hollow electrode device is inserted into the inside of the bottomed
hole, the electrolytic treatment solution is made to flow through
the space inside the bottomed hole, and power is applied across the
electrode device and the inner wall surface of the bottomed hole.
The closed part faces the bottom part of the bottomed hole as an
electrode across a prescribed surface area; therefore,
electroplating at the bottom part of the bottomed hole proceeds to
the same extent as other sites.
Inventors: |
Furukawa; Yuki; (Tochigi,
JP) ; Yamanaka; Masahiro; (Tochigi, JP) ;
Sasaki; Tatsuya; (Tochigi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HONDA MOTOR CO., LTD. |
Tokyo |
|
JP |
|
|
Appl. No.: |
17/742990 |
Filed: |
May 12, 2022 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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16498637 |
Sep 27, 2019 |
11371158 |
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PCT/JP2018/013741 |
Mar 30, 2018 |
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17742990 |
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International
Class: |
C25D 17/12 20060101
C25D017/12; C25D 5/02 20060101 C25D005/02; C25D 7/04 20060101
C25D007/04 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 31, 2017 |
JP |
2017-071316 |
Claims
1. A surface treatment device for applying surface treatment at an
inner wall surface of a bottomed hole, by utilizing an electrode
device to be inserted thereto, the electrode device comprising: a
hollow bottomed large-diameter electrode pipe that is configured to
insert into a space inside the bottomed hole; and a solid
small-diameter electrode rod that is inserted into a space inside
the hollow bottomed large-diameter electrode pipe so that a
front-end side thereof extends to a bottom part of the hollow
bottomed large-diameter electrode pipe so as to couple therewith; a
solution flow channel formed between an inside surface of the
bottomed hole and an outer surface of the hollow bottomed
large-diameter electrode pipe, so that an electrolytic treatment
solution flows therethrough; an external power supply connected
across the electrode device and the inner wall surface of the
bottomed hole; a front-end member provided at a front-end portion
of the hollow bottomed large-diameter electrode pipe, having a
hemispherical configuration so as to close the front-end portion
thereof facing the inner wall surface of the bottomed hole; and at
least one through hole channel defined in the front-end member
linking an inside and an outside of the hollow bottomed
large-diameter electrode pipe.
2. The surface treatment device according to claim 1, wherein, the
external power supply applies voltage across the electrode device
and the inner wall surface of the bottomed hole, the electrode
device is an anode, and the inner wall surface of the bottomed hole
is a cathode.
3. The surface treatment device according to claim 1, wherein, a
front-end portion of the solid small-diameter electrode rod is
screwed to be joined to the front-end member of the hollow bottomed
large-diameter electrode pipe, so that an electrical connection is
established between the solid small-diameter electrode rod and the
front-end member.
4. The surface treatment device according to claim 1, further
comprising: a solution discharge flow channel formed between an
inside surface of the hollow bottomed large-diameter electrode pipe
and an outer surface of the solid small-diameter electrode rod, so
that the solution discharge flow channel communicates with the
solution flow channel through the through hole channel of the
front-end member so as to discharge the electrolytic treatment
solution therethrough.
Description
TECHNICAL FIELD
[0001] The present invention relates to a surface treatment device
that performs surface treatment such as electroplating,
electrodeposition coating, or electrolytic polishing at an inner
wall surface of a bottomed hole formed as a cooling passage in a
casting mold, for example.
BACKGROUND ART
[0002] In the related art, as this type of surface treatment
device, a surface treatment device including a hollow (pipe-shaped)
electrode facing an inner wall surface of a bottomed hole of a
casting mold is proposed (for example, see Patent Document 1).
[0003] In this manner, when the surface treatment device is used to
implement surface treatment at the inner wall surface of the
bottomed hole of the casting mold, the hollow electrode is inserted
and installed inside the bottomed hole to have a prescribed gap
from the bottomed hole. In this state, an electrolytic treatment
solution is made to flow through a space between an outer
peripheral surface of the electrode and the inner wall surface of
the bottomed hole and a space inside the hollow electrode, and
power is applied across the electrode and the casting mold. In the
surface treatment device, since the electrode has a hollow shape,
the space inside the electrode is used as a flow passage of the
electrolytic treatment solution, and thereby an advantage is
obtained in that the electrolytic treatment solution is
sufficiently circulated to a bottom part of the bottomed hole.
[0004] In addition, another surface treatment device is also
proposed, the surface treatment device including, so to speak, an
electrode having a double pipe structure in which, when a bottomed
hole of a casting mold has a stepped shape (that is, shape having a
size of an inner diameter which changes from an opening to the
bottom part of the bottomed hole), a hollow small-diameter
electrode pipe having a shape corresponding to a small-diameter
part of the bottomed hole is inserted into a space inside a hollow
large-diameter electrode pipe having a shape corresponding to a
large-diameter part of the bottomed hole and projects at a front
end side such that the electrode can correspond to the stepped
shape (for example, see Patent Document 2).
[0005] In this manner, when the surface treatment device is used to
implement surface treatment at an inner wall surface of the
bottomed hole having the stepped shape, the large-diameter
electrode pipe and the small-diameter electrode pipe of an
electrode device are inserted and installed in the large-diameter
part and the small-diameter part of the bottomed hole,
respectively, to have a prescribed gap from the bottomed hole. In
this state, an electrolytic treatment solution is made to flow
through a space between outer peripheral surfaces of the
large-diameter electrode pipe and the small-diameter electrode pipe
of the electrode device and the inner wall surface of the bottomed
hole and a space inside the hollow small-diameter electrode pipe,
and power is applied across the large-diameter electrode pipe and
the small-diameter electrode pipe of the electrode device and the
casting mold. In the surface treatment device, since the
small-diameter electrode pipe of the electrode device has a hollow
shape, the space inside the small-diameter electrode pipe is used
as a flow passage of the electrolytic treatment solution, and
thereby an advantage is obtained in that the electrolytic treatment
solution is sufficiently circulated to the bottom part of the
bottomed hole. [0006] Patent Document 1: Japanese Unexamined Patent
Application, Publication No. 2013-159832 [0007] Patent Document 2:
Japanese Unexamined Patent Application, Publication No.
2015-030897
DISCLOSURE OF THE INVENTION
Problems to be Solved by the Invention
[0008] However, in the surface treatment devices, since a front end
of a small-diameter electrode pipe of an electrode or an electrode
device is open, there is a lack of a surface area of a region of
the small-diameter electrode pipe of the electrode or the electrode
device, the region facing the bottom part of the bottomed hole, and
thus insufficient surface treatment is implemented at the bottom
part of the bottomed hole. Hence, an adhesion state of a treatment
layer deteriorates, and thus a thinner film is likely to be formed
at the bottom part of the bottomed hole than at other sites. As a
result, in order to form a film having a prescribed thickness at
the inner wall surface of the bottomed hole, the surface treatment
needs to be implemented for a long time, and thus a problem arises
in that it is difficult to reduce the time required for the surface
treatment.
[0009] With consideration for such a circumstance, an object of the
invention is to provide a surface treatment device that can easily
reduce the time required for surface treatment while maintaining
flow of an electrolytic treatment solution.
Means for Solving the Problems
[0010] According to the invention, there is provided a surface
treatment device (for example, a surface treatment device 10 to be
described below) that implements surface treatment at an inner wall
surface (for example, an inner wall surface 12d or 12e to be
described below) of a bottomed hole (for example, a bottomed hole
12 to be described below), in which a hollow electrode device (for
example, an electrode device 16 to be described below) is inserted
into an inside of the bottomed hole, an electrolytic treatment
solution is made to flow through the space inside the bottomed
hole, and power is applied across the electrode device and the
inner wall surface of the bottomed hole, and the electrode device
is provided with a closed part (for example, a closed part 15 to be
described below) facing a bottom part (for example, a bottom part
12c to be described below) of the bottomed hole, when insertion of
the electrode device into the inside of the bottomed hole is
completed, and a flow through hole (for example, a flow through
hole 17 to be described below) linking the inside and outside of
the electrode device.
[0011] The electrode device may have a hollow large-diameter
electrode pipe (for example, a large-diameter electrode pipe 16a to
be described below) and a hollow small-diameter electrode pipe (for
example, a small-diameter electrode pipe 16b to be described below)
that is inserted into the space inside the large-diameter electrode
pipe and projects out of the large-diameter electrode pipe at a
front end side. When insertion of the electrode device into the
inside of the bottomed hole is completed, a treatment-solution flow
passage (for example, a second supply passage 37b, a third supply
passage 37c, a first collecting passage 49, or a second collecting
passage 59 to be described below) through which the electrolytic
treatment solution flows may be formed in the space between an
outer peripheral surface of the large-diameter electrode pipe and
the inner wall surface of the bottomed hole and the space between
an inner peripheral surface of the large-diameter electrode pipe
and an outer peripheral surface of the small-diameter electrode
pipe.
[0012] The electrode device may have a hollow bottomed
large-diameter electrode pipe (for example, a large-diameter
electrode pipe 19a to be described below) and a solid
small-diameter electrode part (for example, a small-diameter
electrode part 19b to be described below) that is inserted into the
space inside the large-diameter electrode pipe. An
inserting-direction front end portion (for example, an
inserting-direction front end portion 19c to be described below) of
the small-diameter electrode part may be coupled to a bottom part
(for example, a bottom part 19d to be described below) of the
large-diameter electrode pipe. At least one flow through hole may
be formed at a front end side of the large-diameter electrode pipe
in an inserting direction so as to link the inside and outside of
the large-diameter electrode pipe. The electrolytic treatment
solution may flow into the space between the bottomed hole and the
large-diameter electrode pipe, may flow into the space inside the
large-diameter electrode pipe from the flow through hole, and may
be discharged through the space between the small-diameter
electrode part and the large-diameter electrode pipe.
[0013] The electrode device may have a hollow large-diameter
electrode pipe (for example, a large-diameter electrode pipe 16a to
be described below) and a hollow small-diameter electrode pipe (for
example, a small-diameter electrode pipe 16b to be described below)
that is inserted into the space inside the large-diameter electrode
pipe and projects out of the large-diameter electrode pipe at a
front end side. The flow through hole may link the inside and
outside of the small-diameter electrode pipe. When insertion of the
electrode device into the inside of the bottomed hole is completed,
a treatment-solution flow passage (for example, a second supply
passage 37b, a third supply passage 37c, a first collecting passage
49, or a second collecting passage 59 to be described below)
through which the electrolytic treatment solution flows may be
formed in the space between an outer peripheral surface of the
large-diameter electrode pipe and the inner wall surface of the
bottomed hole and the space inside the small-diameter electrode
pipe.
[0014] In the electrode device, at least a region of the
small-diameter electrode pipe, in which the flow through hole is
formed, may be configured to be supported to freely rotate with
respect to the large-diameter electrode pipe, to be disposed
asymmetrically in a circumferential direction of the small-diameter
electrode pipe, with the flow through hole being inclined with
respect to a radial direction of the small-diameter electrode pipe,
and thereby to rotate by a reaction force produced during flowing
of the electrolytic treatment solution.
[0015] In the electrode device, an outer peripheral surface of a
region of the small-diameter electrode pipe may be masked to be
separated from the electrolytic treatment solution, the region
being positioned inside the large-diameter electrode pipe.
[0016] The surface treatment device may include power-applying
control means that is capable of setting a current value of power
which is applied to the large-diameter electrode pipe to a value
larger or smaller than a current value of power which is applied to
the small-diameter electrode pipe, when power is applied across the
electrode device and the inner wall surface of the bottomed
hole.
[0017] When the electrode device is inserted into the inside of the
bottomed hole such that the large-diameter electrode pipe and the
small-diameter electrode pipe of the electrode device are disposed
in a large-diameter part and a small-diameter part of the bottomed
hole, respectively, a distance (for example, a distance L1 to be
described below) from the outer peripheral surface of the
large-diameter electrode pipe to the inner wall surface of the
bottomed hole and a distance (for example, a distance L3 to be
described below) from a front end of the small-diameter electrode
pipe to the bottom part of the bottomed hole may be set to be
substantially equal to each other.
[0018] When power is applied across the electrode device and the
inner wall surface of the bottomed hole, the electrode device may
be an anode, and the inner wall surface of the bottomed hole may be
a cathode.
Effects of the Invention
[0019] According to the invention, it is possible to provide a
surface treatment device that can easily reduce the time required
for surface treatment while maintaining flow of an electrolytic
treatment solution.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 is a front view illustrating an overall configuration
of a surface treatment device according to a first embodiment of
the invention.
[0021] FIG. 2 is a cross-sectional view of a treatment-solution
supply unit of the surface treatment device illustrated in FIG.
1.
[0022] FIG. 3 is a cross-sectional view of an electrode device of
the surface treatment device illustrated in FIG. 1.
[0023] FIG. 4 is a cross-sectional view of a treatment-solution
discharge unit of the surface treatment device illustrated in FIG.
1.
[0024] FIG. 5 is a cross-sectional view of a treatment-solution
collecting unit of the surface treatment device illustrated in FIG.
1.
[0025] FIG. 6 is a front view of main parts of a small-diameter
electrode pipe of the electrode device of the surface treatment
device illustrated in FIG. 1.
[0026] FIG. 7 is a front view of main parts of a small-diameter
electrode pipe of an electrode device of a surface treatment device
according to a second embodiment of the invention.
[0027] FIG. 8 is a cross-sectional view illustrating an electrode
device of a surface treatment device according to a third
embodiment of the invention.
PREFERRED MODE FOR CARRYING OUT THE INVENTION
[0028] Hereinafter, a first embodiment of the invention will be
described with reference to the drawings.
First Embodiment
[0029] FIG. 1 is a front view illustrating an overall configuration
of a surface treatment device according to the first embodiment of
the invention. FIG. 2 is a cross-sectional view of a
treatment-solution supply unit of the surface treatment device
illustrated in FIG. 1. FIG. 3 is a cross-sectional view of an
electrode device of the surface treatment device illustrated in
FIG. 1. FIG. 4 is a cross-sectional view of a treatment-solution
discharge unit of the surface treatment device illustrated in FIG.
1. FIG. 5 is a cross-sectional view of a treatment-solution
collecting unit of the surface treatment device illustrated in FIG.
1. FIG. 6 is a front view of main parts of a small-diameter
electrode pipe of the electrode device of the surface treatment
device illustrated in FIG. 1.
[0030] As illustrated in FIG. 1, a surface treatment device 10
according to the first embodiment is a device that implements
electroplating at inner wall surfaces 12d and 12e of a bottomed
hole 12 having a stepped shape, the bottomed hole being formed as a
cooling passage in a casting mold 14. The surface treatment device
10 can form a plating film (not illustrated) made of zinc,
chromium, gold, silver, copper, tin or the like or an alloy
thereof. For example, a plating film made of a zinc alloy can be
formed by using an electrolytic treatment solution prepared by
mixing zinc chloride, nickel chloride, ammonium chloride, or the
like.
[0031] The electroplating is implemented at the inner wall surfaces
12d and 12e of the bottomed hole 12 of the casting mold 14, in
order to maintain cooling performance of the casting mold 14 and to
reduce the number of times of maintenance thereof. In other words,
the casting mold 14 is formed of alloy steel or the like and is
cooled with a refrigerant such as water which is supplied into the
bottomed hole 12, for example. In this case, when the refrigerant
comes into direct contact with the inner wall surfaces 12d and 12e
of the bottomed hole 12, thermal contraction or corrosion begins at
the inner wall surfaces 12d and 12e, scale/slime is accumulated at
the inner wall surfaces, the cooling performance of the casting
mold 14 deteriorates, and it is difficult to adjust a temperature
of the casting mold 14. Therefore, it is necessary to perform
maintenance such as removal of accumulated matter or re-plating
treatment, and thus a manufacturing line has to be stopped. In this
respect, in order to avoid a state in which the inner wall surfaces
12d and 12e of the bottomed hole 12 comes into direct contact with
the refrigerant, a plating film is formed at the inner wall
surfaces 12d and 12e of the bottomed hole 12 by using the surface
treatment device 10, and thereby the number of times of maintenance
of the casting mold 14 is reduced.
[0032] Here, as illustrated in FIG. 1, the bottomed hole 12 of the
casting mold 14 has a stepped shape and is configured to have a
large-diameter part 12a formed at a side of an opening (left side
in FIG. 1) and a small-diameter part 12b that is formed at a side
of a bottom part 12c (right side in FIG. 1) and has an inner
diameter smaller than that of the large-diameter part 12a.
[0033] <Overall Configuration of Surface Treatment Device
10>
[0034] Next, an overall configuration of the surface treatment
device 10 will be described. The surface treatment device 10
includes an electrode device 16, a treatment-solution supply unit
18, a treatment-solution discharge unit 20, a treatment-solution
collecting unit 22, and a flexible tube 24.
[0035] <Configuration of Electrode Device 16>
[0036] The electrode device 16 is a pipe body formed by
platinum-coated titanium or the like, for example, and thus a front
end of the electrode device 16 is inserted into the bottomed hole
12, the front end projecting out of the treatment-solution supply
unit 18, in a state of being inserted into an inside of the
bottomed hole 12 of the casting mold 14, as illustrated in FIG. 1.
The electrode device 16 has a so-called double pipe structure and
is configured to have a hollow large-diameter electrode pipe 16a
having an outer diameter smaller than the inner diameter of the
large-diameter part 12a of the bottomed hole 12 and a hollow
small-diameter electrode pipe 16b having an outer diameter smaller
than an inner diameter of the large-diameter electrode pipe
16a.
[0037] A front end side of the large-diameter electrode pipe 16a is
inserted into the large-diameter part 12a of the bottomed hole 12,
and a rear end side thereof is connected to the treatment-solution
discharge unit 20. The small-diameter electrode pipe 16b is
inserted through an inside of the large-diameter electrode pipe
16a, in a state of being electrically insulated from the
large-diameter electrode pipe 16a. In addition, a front end side of
the small-diameter electrode pipe 16b projects outside out of a
front end of the large-diameter electrode pipe 16a so as to be
inserted into the small-diameter part 12b of the bottomed hole 12,
in a state in which the electrode device 16 is inserted into the
inside of the bottomed hole 12 of the casting mold 14. A rear end
side of the small-diameter electrode pipe 16b is connected to the
treatment-solution collecting unit 22.
[0038] An insulation cap 50 is attached to a front end of the
large-diameter electrode pipe 16a. Consequently, the electrode
device 16 and the inner wall surfaces 12d and 12e of the bottomed
hole 12 are prevented from coming into contact with each other, and
the large-diameter electrode pipe 16a and the small-diameter
electrode pipe 16b are prevented from coming into contact with each
other. The insulation cap 50 is formed into a pipe shape and is
made of a material such as silicone rubber or fluororesin having an
insulation property and chemical resistance. The insulation cap 50
is formed to have an inner diameter larger than the outer diameter
of the small-diameter electrode pipe 16b, the small-diameter
electrode pipe 16b is inserted through the insulation cap 50.
[0039] Specifically, the insulation cap 50 is integrally formed by
a circular pipe-shaped insertion part 52 that is fitted into the
large-diameter electrode pipe 16a and a cap part 54 having an outer
diameter substantially equal to the outer diameter of the
large-diameter electrode pipe 16a. The insertion part 52 has an
outer diameter equal to or slightly smaller than the inner diameter
of the large-diameter electrode pipe 16a and is fitted into the
inside of the large-diameter electrode pipe 16a.
[0040] The cap part 54 is formed into a shape corresponding to a
shape of a boundary region between the large-diameter part 12a and
the small-diameter part 12b of the bottomed hole 12, and a
hemispherical curved surface is formed at a front end of the cap
part. Consequently, it is possible to effectively prevent the inner
wall surfaces 12d and 12e of the bottomed hole 12 and the electrode
device 16 from coming into contact with each other.
[0041] A side wall of the cap part 54 has a through-hole 56 that
penetrates the side wall and is linked with an inside of the
insulation cap 50. In other words, the through-hole 56 is linked
with a space between an outer peripheral surface of the
small-diameter electrode pipe 16b and an inner wall surface of the
insulation cap 50.
[0042] In addition, a seal member 58 is sandwiched between an inner
wall surface of the cap part 54 and the outer peripheral surface of
the small-diameter electrode pipe 16b, the inner wall surface being
closer to a front end side than the through-hole 56, thereby,
sealing the space therebetween. Consequently, an electrolytic
treatment solution flowing through a second supply passage 37b
(space between an inner wall surface of the large-diameter part 12a
of the bottomed hole 12 and an outer peripheral surface of the
large-diameter electrode pipe 16a) as a treatment-solution flow
passage flows through the through-hole 56 to a first collecting
passage 49 formed between the large-diameter electrode pipe 16a and
the small-diameter electrode pipe 16b.
[0043] As illustrated in FIG. 3, an O-ring 60 is provided between
the insulation cap 50 and the large-diameter electrode pipe 16a.
The O-ring 60 functions as a joint when the insulation cap 50 is
attached to the large-diameter electrode pipe.
[0044] In addition, the front end side of the small-diameter
electrode pipe 16b is extended outside out of the front end of the
large-diameter electrode pipe 16a via the open insulation cap 50 in
the bottomed hole 12 and is disposed in an inside of the
small-diameter part 12b. A third supply passage 37c as a
treatment-solution flow passage is formed at a space between the
outer peripheral surface of the small-diameter electrode pipe 16b
and an inner wall surface of the small-diameter part 12b of the
bottomed hole 12. An electrolytic treatment solution being split
without flowing into the through-hole 56 from the second supply
passage 37b flows through the third supply passage 37c.
[0045] In addition, the electrolytic treatment solution flowing
through the bottom part 12c of the bottomed hole 12 can flow into
an inside of the small-diameter electrode pipe 16b from a front end
of the small-diameter electrode pipe 16b. In other words, a second
collecting passage 59 as a treatment-solution flow passage is
formed in the inside of the small-diameter electrode pipe 16b.
[0046] Meanwhile, as illustrated in FIGS. 3 and 6, only a front end
portion 16c of the small-diameter electrode pipe 16b of the
electrode device 16 is supported to freely rotate around an axial
core CT1 of the small-diameter electrode pipe 16b in an arrow M
direction via a bearing 16d. The front end portion 16c has a closed
part 15 facing the bottom part 12c of the bottomed hole 12, when
the electrode device 16 is inserted into the inside of the bottomed
hole 12 of the casting mold 14, and a plurality of (for example,
four) flow through holes 17 linking the inside and outside of the
small-diameter electrode pipe 16b are formed to be disposed at
equiangular (for example, 90.degree.) intervals on the
circumference.
[0047] Incidentally, the closed part 15 is formed into a
hemispherical shape corresponding to a shape of the bottom part 12c
of the bottomed hole 12. In addition, the front end portion 16c of
the small-diameter electrode pipe 16b is disposed asymmetrically
(for example, in a triangular shape or a teardrop shape) in a
circumferential direction of the small-diameter electrode pipe 16b,
with the flow through holes 17 being inclined with respect to a
radial direction of the small-diameter electrode pipe 16b, and
thereby the front end portion 16c is configured to rotate by a
reaction force produced during flowing of the electrolytic
treatment solution.
[0048] Further, in the electrode device 16, an outer peripheral
surface of a region of the small-diameter electrode pipe 16b is
masked to be separated from the electrolytic treatment solution,
the region being positioned inside the large-diameter electrode
pipe 16a.
[0049] <Configuration of Treatment-Solution Supply Unit
18>
[0050] As illustrated in FIG. 2, the treatment-solution supply unit
18 has a main-body member 26 that is detachably attached to the
bottomed hole 12 and a first male connector 28 that fixes the
electrode device 16 to the main-body member 26.
[0051] The main-body member 26 has a circular pipe-shaped insertion
part 30 that is inserted into the bottomed hole 12 and a
treatment-solution supply pipe 32 that is connected to
treatment-solution supply means, both the insertion part and the
treatment-solution supply pipe being formed in a projecting manner.
The insertion part 30 has an outer diameter equal to or slightly
smaller than an inner diameter of the bottomed hole 12
(large-diameter part 12a) in the vicinity of an opening. The
insertion part 30 is fitted into the bottomed hole 12, and thereby
it is possible to detachably attach the main-body member 26 to the
bottomed hole 12.
[0052] An annular groove 33 is formed in the main-body member 26,
and a seal member 34 is installed in the annular groove 33. The
seal member 34 seals a space between the casting mold 14 and the
main-body member 26.
[0053] The main-body member 26 has an electrode penetrating hole 36
that penetrates an inside of the main-body member 26. The insertion
part 30 is inserted into the bottomed hole 12, and thereby the
bottomed hole 12 is linked with the electrode penetrating hole 36.
The electrode penetrating hole 36 is a through-hole having an inner
diameter larger than the outer diameter of the large-diameter
electrode pipe 16a, and thus the electrode device 16
(large-diameter electrode pipe 16a and small-diameter electrode
pipe 16b) penetrates an inside of the electrode penetrating hole
36. In addition, the first male connector 28 is attached to a left
end portion of the electrode penetrating hole 36. Consequently, a
relative position of the large-diameter electrode pipe 16a with
respect to the electrode penetrating hole 36 is fixed, and a space
between the outer peripheral surface of the large-diameter
electrode pipe 16a and an inner wall surface of the electrode
penetrating hole 36 is sealed.
[0054] The electrode penetrating hole 36 is linked with an inside
of the treatment-solution supply pipe 32 in the main-body member
26. Hence, the electrolytic treatment solution supplied from the
treatment-solution supply means via the treatment-solution supply
pipe 32 is supplied into the bottomed hole 12 through the space
between the outer peripheral surface of the large-diameter
electrode pipe 16a and the inner wall surface of the electrode
penetrating hole 36.
[0055] In other words, a supply passage of the electrolytic
treatment solution is formed between the outer peripheral surface
of the large-diameter electrode pipe 16a and inner walls of the
electrode penetrating hole 36 and the bottomed hole 12.
Hereinafter, for convenience of description, a supply passage
between the outer peripheral surface of the large-diameter
electrode pipe 16a and the inner wall surface of the electrode
penetrating hole 36, a supply passage between the outer peripheral
surface of the large-diameter electrode pipe 16a and the inner wall
surface 12d of the large-diameter part 12a, and a supply passage
between the outer peripheral surface of the small-diameter
electrode pipe 16b and the inner wall surface 12e of the
small-diameter part 12b are referred to as a "first supply
passage", the "second supply passage", and the "third supply
passage", respectively, and are represented by reference signs of
37a, 37b, and 37c, respectively.
[0056] The first male connector 28 is configured to have a main
connector body 38 and a fastening member 40, and the electrode
device 16 (large-diameter electrode pipe 16a and small-diameter
electrode pipe 16b) is inserted through an inside of the first male
connector. A male screw 42 is formed at an outer peripheral surface
at one end side of the main connector body 38, and the male screw
42 is screwed in the electrode penetrating hole 36. In this manner,
the main connector body 38 is connected to the main-body member 26.
At the same time, it is possible to seal a space between an inner
wall surface at a left end of the electrode penetrating hole 36 and
the outer peripheral surface of the large-diameter electrode pipe
16a.
[0057] In addition, a male screw 44 is formed at an outer
peripheral surface of a left end of the main connector body 38. The
male screw 44 is screwed with a female screw 46 formed at an inner
peripheral surface of the fastening member 40, and thereby a
fastening force is applied to the large-diameter electrode pipe 16a
of the electrode device 16 in the first male connector 28. That is,
an insertion length of the large-diameter electrode pipe 16a is
adjusted in a depth direction of the bottomed hole 12, and then a
fastening force is applied by the fastening member 40.
Consequently, the large-diameter electrode pipe 16a is positioned
in a state in which the insertion length has been adjusted.
[0058] Incidentally, in the electrode device 16, a spacer 48 for
preventing the large-diameter electrode pipe 16a and the
small-diameter electrode pipe 16b from coming into contact with
each other is disposed between the small-diameter electrode pipe
16b and the large-diameter electrode pipe 16a to which the
fastening force is applied. A space between the large-diameter
electrode pipe 16a and the small-diameter electrode pipe 16b
becomes the first collecting passage 49 for collecting the
electrolytic treatment solution. Therefore, the spacer 48 has a
through-hole along a flow-through direction (extension direction of
the first collecting passage 49) such that the electrolytic
treatment solution flows through without interruption.
[0059] <Configuration of Treatment-Solution Discharge Unit
20>
[0060] As illustrated in FIG. 4, the treatment-solution discharge
unit 20 has a main-body member 62, a second male connector 64, a
third male connector 66, and a fourth male connector 68. A
treatment-solution discharge pipe 70 is formed to project from the
main-body member 62, the treatment-solution discharge pipe being
connected to a treatment-solution tank. In addition, a junction
pipe 72 is formed to project from a side wall of the
treatment-solution discharge pipe 70. The main-body member 62 has a
small-diameter-electrode pipe penetrating hole 74 which penetrates
an inside of the main-body member 62 and through which the
small-diameter electrode pipe 16b is inserted. The
small-diameter-electrode pipe penetrating hole 74 is linked with an
inside of the treatment-solution discharge pipe 70. In addition, an
inside of the treatment-solution discharge pipe 70 is linked with
an inside of the junction pipe 72.
[0061] A rear end portion of the large-diameter electrode pipe 16a
is connected to the small-diameter-electrode pipe penetrating hole
74 via the second male connector 64. In addition, an end portion of
the flexible tube 24 is connected to the junction pipe 72 via the
fourth male connector 68.
[0062] All of the second male connector 64, the third male
connector 66, and the fourth male connector 68 have the same
configuration as that of the first male connector 28 described
above, basically. In other words, the second male connector 64 has
a main connector body 76 and a fastening member 78. A step part 80
having a height substantially equal to a wall thickness of the
large-diameter electrode pipe 16a is formed in an inside of the
main connector body 76, and the rear end portion of the
large-diameter electrode pipe 16a is in contact with the step part
80. Consequently, the large-diameter electrode pipe 16a is
positioned with respect to the main connector body 76.
[0063] In addition, a male screw 82 formed at an outer peripheral
surface of a left end of the main connector body 76 is screwed in
the small-diameter-electrode pipe penetrating hole 74, and thereby
the main connector body 76 is connected to the main-body member 62.
On the other hand, a male screw 84 formed at an outer peripheral
surface of a right end of the main connector body 76 is screwed
with a female screw 86 of the fastening member 78, and thereby a
fastening force is applied to the large-diameter electrode pipe 16a
inserted through the second male connector 64. Consequently, the
small-diameter-electrode pipe penetrating hole 74 of the main-body
member 62 and the inside of the large-diameter electrode pipe 16a
are linked in a sealed state from the outside. Hence, the
electrolytic treatment solution flowing through the first
collecting passage 49 flows through the small-diameter-electrode
pipe penetrating hole 74 via the second male connector 64 and is
sent into the treatment-solution discharge pipe 70.
[0064] Incidentally, in the electrode device 16, a spacer 51 for
preventing the large-diameter electrode pipe 16a and the
small-diameter electrode pipe 16b from coming into contact with
each other is disposed between the small-diameter electrode pipe
16b and the large-diameter electrode pipe 16a to which the
fastening force is applied. A space between the large-diameter
electrode pipe 16a and the small-diameter electrode pipe 16b
becomes the first collecting passage 49 for collecting the
electrolytic treatment solution. Therefore, the spacer 51 has a
through-hole along a flow-through direction (extension direction of
the first collecting passage 49) such that the electrolytic
treatment solution flows through without interruption.
[0065] The third male connector 66 has a main connector body 88 and
a fastening member 90. The main connector body 88 is screwed in the
small-diameter-electrode pipe penetrating hole 74, and thereby the
third male connector 66 is attached to the main-body member 62. In
addition, the fastening member 90 is screwed with the main
connector body 88, and thereby a fastening force is applied to the
small-diameter electrode pipe 16b. In other words, an insertion
length of the small-diameter electrode pipe 16b with respect to the
bottomed hole 12 is adjusted, and then, a fastening force is
applied by the fastening member 90. In this manner, the insertion
length of the small-diameter electrode pipe 16b is freely adjusted
with respect to the bottomed hole 12. In addition, in a state in
which a space between the outer peripheral surface of the
small-diameter electrode pipe 16b and an inner wall surface of the
small-diameter-electrode pipe penetrating hole 74 is sealed, it is
possible to fix the small-diameter electrode pipe 16b to the
main-body member 62.
[0066] The fourth male connector 68 has a main connector body 92
and a fastening member 94. The main connector body 92 is screwed
with the junction pipe 72, and thereby the fourth male connector 68
is attached to the main-body member 62. In addition, a step part 96
having a height substantially equal to a wall thickness of the
flexible tube 24 is formed in an inside of the main connector body
92. One end portion of the flexible tube 24 is in contact with the
step part 96, and thereby the flexible tube 24 is fixed to the main
connector body 92.
[0067] In other words, an inside of the flexible tube 24 and the
junction pipe 72 are coupled to each other via the fourth male
connector 68 in a sealed state from the outside. Consequently, the
electrolytic treatment solution flowing through inside of the
flexible tube 24 flows through the junction pipe 72 via the fourth
male connector 68 and is sent into the treatment-solution discharge
pipe 70.
[0068] <Configuration of Treatment-Solution Collecting Unit
22>
[0069] As illustrated in FIG. 5, the treatment-solution collecting
unit 22 has an elbow-type main-body member 98, a fifth male
connector 100, and a sixth male connector 102. A collecting hole
104 is formed to penetrate an inside of the main-body member
98.
[0070] The fifth male connector 100 has a main connector body 106
and a fastening member 108. The main connector body 106 is screwed
at a right end side of the collecting hole 104, and thereby the
fifth male connector 100 is attached to the main-body member 98. In
addition, the fastening member 108 is screwed with the main
connector body 106, and thereby a fastening force is applied to the
small-diameter electrode pipe 16b.
[0071] The sixth male connector 102 has a main connector body 110
and a fastening member 112. The main connector body 110 is screwed
at a lower end side of the collecting hole 104, and thereby the
sixth male connector 102 is attached to the main-body member 98. In
addition, the fastening member 112 is screwed with the main
connector body 110, and thereby a fastening force is applied to the
flexible tube 24.
[0072] <Configuration of Flexible Tube 24>
[0073] The flexible tube 24 is a pipe body having flexibility,
which is made of a resin, rubber, metal, or another material. The
treatment-solution collecting unit 22 and the treatment-solution
discharge unit 20 are connected to each other via the flexible tube
24.
[0074] Incidentally, the surface treatment device 10 further
includes treatment-solution supply means, a treatment-solution
tank, and an external power supply (all not illustrated), in
addition to configurational elements described above. The
treatment-solution supply means supplies the electrolytic treatment
solution into the bottomed hole 12 via the treatment-solution
supply unit 18. The treatment-solution tank stores the electrolytic
treatment solution discharged via the treatment-solution discharge
unit 20. The external power supply supplies a current across the
electrode device 16 and the casting mold 14 and produces a
potential difference between the electrode device 16 and the inner
wall surfaces 12d and 12e of the bottomed hole 12. In this case,
the external power supply is capable of supplying a current having
a different magnitude to each of the large-diameter electrode pipe
16a and the small-diameter electrode pipe 16b of the electrode
device 16.
[0075] <Procedure of Electroplating>
[0076] The surface treatment device 10 has the configuration
described above, and thus the electroplating is implemented by
using the surface treatment device 10 in accordance with the
following procedure, when the electroplating is implemented at the
inner wall surfaces 12d and 12e of the bottomed hole 12 of the
casting mold 14.
[0077] First, in a state in which the large-diameter electrode pipe
16a projects out of the insertion part 30 of the treatment-solution
supply unit 18 by a prescribed length such that the large-diameter
electrode pipe 16a is disposed in the large-diameter part 12a, a
fastening force is applied to the large-diameter electrode pipe 16a
by the first male connector 28 and the second male connector 64.
Consequently, the large-diameter electrode pipe 16a is fixed to the
treatment-solution supply unit 18 and the treatment-solution
discharge unit 20.
[0078] Next, in a state in which the small-diameter electrode pipe
16b projects out of the front end of the large-diameter electrode
pipe 16a by a prescribed length so as to be disposed in the
small-diameter part 12b, a fastening force is applied to the
small-diameter electrode pipe 16b by the third male connector 66
and the fifth male connector 100. Consequently, the small-diameter
electrode pipe 16b is fixed to the treatment-solution discharge
unit 20 and the treatment-solution collecting unit 22.
[0079] Further, the insulation cap 50 is attached to the front end
of the large-diameter electrode pipe 16a.
[0080] In this state, as illustrated in FIG. 1, the electrode
device 16 is inserted into the bottomed hole 12 having the stepped
shape, and the insertion part 30 is fitted in the vicinity of the
opening of the bottomed hole 12. Then, the electrode device 16
comes into a state in which the large-diameter electrode pipe 16a
is separated from the inner wall surface 12d of the large-diameter
part 12a of the bottomed hole 12 by a prescribed distance L1 so as
to be electrically insulated, and the small-diameter electrode pipe
16b is separated from the inner wall surface 12e of the
small-diameter part 12b of the bottomed hole 12 by a prescribed
distance L2 so as to be electrically insulated.
[0081] In this case, the electrode device 16 has a configuration in
which a projecting length of the small-diameter electrode pipe 16b
is appropriately adjusted depending on a depth of the
small-diameter part 12b of the bottomed hole 12 in advance, and
thereby the distance L1 from the outer peripheral surface of the
large-diameter electrode pipe 16a to the inner wall surface 12d of
the bottomed hole 12 and a distance L3 from the front end of the
small-diameter electrode pipe 16b to the bottom part 12c of the
bottomed hole 12 become substantially equal to each other
(L1.apprxeq.L3).
[0082] Next, the electrolytic treatment solution is made to flow
through the space inside the bottomed hole 12. For this, the
electrolytic treatment solution is supplied from the
treatment-solution supply means to the treatment-solution supply
pipe 32. Then, as illustrated in FIG. 2, the electrolytic treatment
solution is supplied into the bottomed hole 12 through the first
supply passage 37a. Afterwards, as illustrated in FIG. 3, the
electrolytic treatment solution flows to the front end of the
large-diameter electrode pipe 16a, and then a part of the
electrolytic treatment solution flows through the first collecting
passage 49 via the through-hole 56, and the rest thereof flows
through the third supply passage 37c and then flows through the
second collecting passage 59 in the small-diameter electrode pipe
16b from the plurality of flow through holes 17.
[0083] In this manner, as illustrated in FIG. 4, the electrolytic
treatment solution flowing through the first collecting passage 49
flows through the treatment-solution discharge pipe 70 via the
small-diameter-electrode pipe penetrating hole 74 in the
treatment-solution discharge unit 20 and is discharged from the
treatment-solution discharge pipe 70 to the treatment-solution
tank.
[0084] On the other hand, as illustrated in FIG. 5, the
electrolytic treatment solution flowing through the second
collecting passage 59 flows into the flexible tube 24 via the
collecting hole 104 in the treatment-solution collecting unit 22.
Consequently, as illustrated in FIG. 4, the electrolytic treatment
solution flows through the junction pipe 72 of the
treatment-solution discharge unit 20 via the flexible tube 24, and
the electrolytic treatment solution converges with the electrolytic
treatment solution from the small-diameter-electrode pipe
penetrating hole 74 and is discharged to the treatment-solution
tank in the treatment-solution discharge pipe 70.
[0085] When the electrolytic treatment solution is made to flow
through the space inside the bottomed hole 12 as described above,
and the electrolytic treatment solution flows from the third supply
passage 37c through the flow through holes 17 of the small-diameter
electrode pipe 16b to the second collecting passage 59 in the
small-diameter electrode pipe 16b, the front end portion 16c of the
small-diameter electrode pipe 16b rotates in the arrow M direction
by a reaction force produced during flowing of the electrolytic
treatment solution.
[0086] In this state, the external power supply applies power
across the electrode device 16 and the inner wall surfaces 12d and
12e of the bottomed hole 12. In this case, the electrode device 16
is an anode, and the inner wall surfaces 12d and 12e of the
bottomed hole 12 (casting mold 14) is a cathode. In addition,
power-applying control means (not illustrated) sets a current value
of power which is applied to the large-diameter electrode pipe 16a
to a value larger or smaller than a current value of power which is
applied to the small-diameter electrode pipe 16b.
[0087] Then, through the electroplating, a plating film is formed
at the inner wall surfaces 12d and 12e of the bottomed hole 12 of
the casting mold 14. In this case, the front end portion 16c of the
small-diameter electrode pipe 16b has the closed part 15, and thus
the closed part 15 as the electrode faces the bottom part 12c of
the bottomed hole 12 across a prescribed surface area. Therefore,
when the electroplating is implemented at the inner wall surfaces
12d and 12e of the bottomed hole 12, the electroplating at the
bottom part 12c of the bottomed hole 12 can proceed to the same
extent as the electroplating at other sites. Furthermore, the front
end portion 16c of the small-diameter electrode pipe 16b has the
flow through holes 17, and thus the flow through holes 17 enables
flow of the electrolytic treatment solution to be maintained.
Hence, it is possible to easily reduce the time required for the
electroplating while maintaining the flow of the electrolytic
treatment solution.
[0088] In addition, since the distance L1 from the outer peripheral
surface of the large-diameter electrode pipe 16a to the inner wall
surface 12d of the bottomed hole 12 and the distance L3 from the
front end of the small-diameter electrode pipe 16b to the bottom
part 12c of the bottomed hole 12 are substantially equal to each
other, it is possible to form a uniform plating film in a depth
direction of the bottomed hole 12.
[0089] Furthermore, since the front end portion 16c of the
small-diameter electrode pipe 16b rotates, the plurality of flow
through holes 17 formed at the front end portion 16c also rotate,
and thus it is possible to form a uniform plating film in a
circumferential direction of the bottomed hole 12.
[0090] Further, in the electrode device 16, since the outer
peripheral surface of the region of the small-diameter electrode
pipe 16b is masked to be separated from the electrolytic treatment
solution, the region being positioned inside the large-diameter
electrode pipe 16a, an electrochemical reaction is prevented at
this masked region, the electrochemical reaction intensively occurs
only at a projecting region (that is, region facing the inner wall
surface 12e of the small-diameter part 12b of the bottomed hole 12)
of the small-diameter electrode pipe 16b. Therefore, it is possible
to sufficiently implement the electroplating at the inner wall
surface 12e of the small-diameter part 12b of the bottomed hole
12.
[0091] In addition, since the current value of power which is
applied to the large-diameter electrode pipe 16a is larger than the
current value of power which is applied to the small-diameter
electrode pipe 16b, a thickness of a plating film formed at the
bottom part 12c of the bottomed hole 12 can be thicker than a
thickness of a plating film formed at other sites.
[0092] Here, the surface treatment device 10 ends the
electroplating.
Second Embodiment
[0093] FIG. 7 is a front view of main parts of a small-diameter
electrode pipe of an electrode device of a surface treatment device
according to a second embodiment of the invention.
[0094] As illustrated in FIG. 7, a surface treatment device 10
according to the second embodiment has the same configuration as
that of the first embodiment described above except that the entire
small-diameter electrode pipe 16b of the electrode device 16 is
configured to rotate by a motor (not illustrated). Incidentally,
the same reference numerals are assigned to the same members as
those of the first embodiment, and thus the description thereof is
omitted.
[0095] Hence, in the second embodiment, the same operational
effects as those of the first embodiment described above are
achieved. Additionally, since the bearing 16d is not provided in
the small-diameter electrode pipe 16b of the electrode device 16,
the small-diameter electrode pipe 16b can be simplified
accordingly.
Third Embodiment
[0096] FIG. 8 is a cross-sectional view illustrating an electrode
device of a surface treatment device according to a third
embodiment of the invention.
[0097] As illustrated in FIG. 8, a surface treatment device 10
according to the third embodiment is a device that implements
electroplating at an inner wall surface 13d of a bottomed hole 13
having a non-stepped shape (that is, shape having a constant size
of an inner diameter from an opening to a bottom part of the
bottomed hole). The surface treatment device 10 includes an
electrode device 19. As illustrated in FIG. 8, the electrode device
19 has a hollow bottomed large-diameter electrode pipe 19a and a
solid small-diameter electrode part 19b that is inserted into the
space inside the large-diameter electrode pipe 19a. An
inserting-direction front end portion 19c of the small-diameter
electrode part 19b is coupled and electrically connected to a
bottom part 19d of the large-diameter electrode pipe 19a, with the
front end portion being screwed in the bottom part 19d of the
large-diameter electrode pipe 19a. At least one flow through hole
17 is formed at a front end side of the large-diameter electrode
pipe 19a in an inserting direction so as to link the inside and
outside of the large-diameter electrode pipe 19a. Incidentally, the
large-diameter electrode pipe 19a is configured to have a
substantially hemispherical front end member 19f which is screwed
to be joined to a cylindrical pipe member 19e.
[0098] The other configurations (for example, the surface treatment
device 10 includes the treatment-solution supply unit 18, the
treatment-solution discharge unit 20, the treatment-solution
collecting unit 22, and the flexible tube 24, in addition to the
electrode device 19) are the same as that of the first embodiment
described above.
[0099] In this manner, the surface treatment device 10 according to
the third embodiment is used to implement electroplating in
accordance with the same procedure as that of the first embodiment
described above, when the electroplating is implemented at the
inner wall surface 13d of the bottomed hole 13.
[0100] However, when the electrolytic treatment solution is made to
flow through a space inside the bottomed hole 13, the electrolytic
treatment solution is made to flow into a space between the
bottomed hole 13 and the large-diameter electrode pipe 19a and to
flow into a space inside the large-diameter electrode pipe 19a from
the flow through hole 17 and is discharged through a space between
the small-diameter electrode part 19b and the large-diameter
electrode pipe 19a, as illustrated by an arrow in FIG. 8.
[0101] In this state, when power is applied across the electrode
device 19 and the inner wall surface 13d of the bottomed hole 13,
the electroplating is implemented at the inner wall surface 13d of
the bottomed hole 13. In this case, since the inserting-direction
front end portion 19c of the small-diameter electrode part 19b is
electrically connected to the bottom part 19d of the large-diameter
electrode pipe 19a, as described above, power can be applied in a
state of having a high current value of the bottom part 19d. As a
result, it is possible to implement thick electroplating at the
bottom part 13c of the bottomed hole 13 facing the bottom part 19d
of the large-diameter electrode pipe 19a.
OTHER EMBODIMENTS
[0102] As described above, the embodiments of the invention are
described; however, the invention is not limited to the
above-described embodiments. In addition, the effects described in
the embodiments are only a list of the most preferred effects
achieved by the invention, and effects of the invention are not
limited to the effects described in the embodiments.
[0103] For example, in the description of the first and second
embodiments described above, the surface treatment device 10 has
the configuration in which the electrolytic treatment solution
flows from the third supply passage 37c through the flow through
holes 17 of the small-diameter electrode pipe 16b to the second
collecting passage 59 in the small-diameter electrode pipe 16b.
However, conversely, the invention can also be similarly applied
also to a case where the electrolytic treatment solution flows from
the second collecting passage 59 in the small-diameter electrode
pipe 16b through the flow through holes 17 of the small-diameter
electrode pipe 16b to the third supply passage 37c.
[0104] In addition, in the description of the first and second
embodiments described above, the surface treatment device 10
includes the electrode device 16 having the double pipe structure
in which the hollow small-diameter electrode pipe 16b is inserted
through the inside of the hollow large-diameter electrode pipe 16a.
However, the small-diameter electrode pipe 16b can be formed to be
solid. In this case, a space between the outer peripheral surface
of the large-diameter electrode pipe 16a and the inner wall surface
12d of the bottomed hole 12 and a space between the inner
peripheral surface of the large-diameter electrode pipe 16a and the
outer peripheral surface of the small-diameter electrode pipe 16b
are used as a treatment-solution flow passage, and thereby the
electrolytic treatment solution can be made to flow through the
space inside the bottomed hole 12.
[0105] In addition, in the description of the first and second
embodiments described above, the surface treatment device 10
includes the electrode device 16 having the double pipe structure
that can correspond to the bottomed hole 12 having the stepped
shape. However, the invention can be similarly applied also to a
case where the surface treatment is implemented at an inner wall
surface of a bottomed hole having a non-stepped shape (that is,
shape having a constant size of an inner diameter from an opening
to a bottom part of the bottomed hole).
[0106] In addition, in the description of the first to third
embodiments described above, the electroplating is implemented at
the inner wall surface 12d, 12e, or 13d of the bottomed hole 12 or
13 which is formed as a cooling passage in the casting mold 14.
However, the bottomed hole is not limited to the bottomed hole 12
or 13, and the invention can be similarly applied also to a case
where the electroplating is implemented at an inner wall surface of
another bottomed hole.
[0107] In addition, in the description of the first to third
embodiments described above, the electroplating is implemented at
the bottomed hole 12 or 13 of the casting mold 14. However, the
invention can be similarly applied not only to the bottomed hole 12
or 13 but also to a line cooling passage which is a bent cooling
link passage inside the casting mold 14.
[0108] Further, in the first to third embodiments described above,
the surface treatment device 10 that implements the electroplating
is described. However, the invention can be similarly applied also
to a surface treatment device that implements a surface treatment
(for example, electrolytic etching, electrolytic degreasing,
electrodeposition coating, anodic oxidation, cathodic oxidation, or
electrolytic polishing), in addition to the electroplating.
EXPLANATION OF REFERENCE NUMERALS
[0109] 10 SURFACE TREATMENT DEVICE [0110] 12 BOTTOMED HOLE [0111]
12a LARGE-DIAMETER PART [0112] 12b SMALL-DIAMETER PART [0113] 12c
BOTTOM PART [0114] 12d, 12e INNER WALL SURFACE [0115] 13 BOTTOMED
HOLE [0116] 13d INNER WALL SURFACE [0117] 14 CASTING MOLD [0118] 15
CLOSED PART [0119] 16 ELECTRODE DEVICE [0120] 16a LARGE-DIAMETER
ELECTRODE PIPE [0121] 16b SMALL-DIAMETER ELECTRODE PIPE [0122] 16c
FRONT END PORTION [0123] 17 FLOW THROUGH HOLE [0124] 19 ELECTRODE
DEVICE [0125] 19a LARGE-DIAMETER ELECTRODE PIPE [0126] 19b
SMALL-DIAMETER ELECTRODE PART [0127] 19c INSERTING-DIRECTION FRONT
END PORTION [0128] 19d BOTTOM PART [0129] L1 DISTANCE FROM OUTER
PERIPHERAL SURFACE OF LARGE-DIAMETER ELECTRODE PIPE TO INNER WALL
SURFACE OF BOTTOMED HOLE [0130] L2 DISTANCE FROM OUTER PERIPHERAL
SURFACE OF SMALL-DIAMETER ELECTRODE PIPE TO INNER WALL SURFACE OF
BOTTOMED HOLE [0131] L3 DISTANCE FROM FRONT END OF SMALL-DIAMETER
ELECTRODE PIPE TO BOTTOM PART OF BOTTOMED HOLE [0132] 37b SECOND
SUPPLY PASSAGE (TREATMENT-SOLUTION FLOW PASSAGE) [0133] 37c THIRD
SUPPLY PASSAGE (TREATMENT-SOLUTION FLOW PASSAGE) [0134] 49 FIRST
COLLECTING PASSAGE (TREATMENT-SOLUTION FLOW PASSAGE) [0135] 59
SECOND COLLECTING PASSAGE (TREATMENT-SOLUTION FLOW PASSAGE)
* * * * *