U.S. patent application number 14/901992 was filed with the patent office on 2017-01-19 for feeder insert for a vertically split casting mold.
This patent application is currently assigned to GTP Schaefer Giesstechnische Produkte GmbH. The applicant listed for this patent is GTP Schaefer Giesstechnische Produkte GmbH. Invention is credited to Tobias Hesse, Thomas Schaefer.
Application Number | 20170014896 14/901992 |
Document ID | / |
Family ID | 48700461 |
Filed Date | 2017-01-19 |
United States Patent
Application |
20170014896 |
Kind Code |
A1 |
Schaefer; Thomas ; et
al. |
January 19, 2017 |
Feeder Insert For A Vertically Split Casting Mold
Abstract
A feeder insert (10) for use in a vertically split casting mold
that is used for the casting of metals includes a feeder body (11),
which has an internal cavity (12) as feeder volume and which is
composed of an exothermic and/or insulating material and which, in
the base surface (17) thereof, which faces toward a pattern
inserted into the casting mold during production of the casting
mold, has a feeder opening (18) for connecting the cavity (12) to
the mold cavity of the casting mold, wherein the feeder body (11)
is oriented with its longitudinal axis (21), which runs through the
feeder opening (18), at an angle with respect to the vertically
oriented pattern and so as to be horizontal relative to the
pattern, and the volume of the internal cavity (12) is of
asymmetrical design with respect to an imaginary parting plane (25)
running in or parallel to the longitudinal axis (21), characterized
in that the feeder body (11) has an uneven mass distribution with
respect to the parting plane (25), with a center of mass situated
to one side of and spaced apart from the parting plane (25), and
that region (28) of the internal cavity (12) of the feeder body
(11) which is situated on that side of the parting plane (25) which
is situated opposite the center of mass has a larger volume than
that region (29) of the internal cavity (12) which is situated on
that side of the parting plane (25) which faces toward the center
of the mass.
Inventors: |
Schaefer; Thomas; (Frechen,
DE) ; Hesse; Tobias; (Wuelfingen, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
GTP Schaefer Giesstechnische Produkte GmbH |
Grevenboich |
|
DE |
|
|
Assignee: |
GTP Schaefer Giesstechnische
Produkte GmbH
Grevenboich
DE
|
Family ID: |
48700461 |
Appl. No.: |
14/901992 |
Filed: |
July 1, 2014 |
PCT Filed: |
July 1, 2014 |
PCT NO: |
PCT/EP2014/063894 |
371 Date: |
December 29, 2015 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B22C 9/088 20130101 |
International
Class: |
B22C 9/08 20060101
B22C009/08 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 2, 2013 |
EP |
13174766.9 |
Claims
1-7. (canceled)
8. A feeder insert (10) for use in a vertically split casting mold
that is used for the casting of metals, comprising: a feeder body
(11) having an internal cavity (12) as feeder volume, wherein said
feeder body (11) is composed of an exothermic and/or insulating
material, said feeder body (11) having a base surface (17). wherein
said base surface (17) faces toward a vertically oriented pattern
inserted into the casting mold during production of the casting
mold, said base surface (17) having a feeder opening (18) for
connecting the internal cavity (12) to a mold cavity of the casting
mold, wherein the feeder body (11) has a longitudinal axis (21)
running through the feeder opening (18) and is oriented with said
longitudinal axis (21) at an angle with respect to the vertically
oriented pattern and so as to be horizontal relative to the
pattern, wherein the volume of the internal cavity (12) is of
asymmetrical design with respect to an imaginary parting plane (25)
running in or parallel to the longitudinal axis (21), wherein the
feeder body (11) has an uneven mass distribution with respect to
the parting plane (25), with a center of mass situated to one side
of and spaced apart from the parting plane (25), and wherein a
region (28) of the internal cavity (12) of the feeder body (11)
that is situated on a side of the parting plane (25) which is
situated opposite the center of mass has a larger volume than a
further region (29) of the internal cavity (12) which is situated
on a side of the parting plane (25) that faces toward the center of
mass.
9. The feeder insert according to claim 8, wherein the uneven mass
distribution is realized by formation of different wall thicknesses
on the feeder body (11), whereby the region (27) of the wall area
(13) disposed beneath the parting plane (25) with a horizontal
orientation of the feeder body (11) relative to the vertically
oriented pattern has a greater wall thickness than the region (26)
of the wall area (13) of the feeder body (11) disposed above the
parting plane (25).
10. The feeder insert according to claim 8, wherein the
longitudinal axis (21) of the feeder opening (18) forms a central
axis of the feeder body (11).
11. The feeder insert according to claim 8, wherein the
longitudinal axis (21) of the feeder opening (18) is arranged
eccentric to a central axis of the feeder body (11).
12. The feeder insert according to claim 8, wherein the feeder body
(11) includes a cover region (14), wherein said cover region (14)
is disposed opposite to the base surface (17) and includes an
opening (22) that is aligned with the feeder opening (18) and
disposed in the longitudinal axis (21) running through the feeder
opening (18) for receiving a mold pin secured to the vertically
oriented pattern inserted in the mold.
13. The feeder insert according to claim 8, wherein the feeder body
(11) comprises two halves (11a, 11b) divided along a transverse
axis (23) running at a right angle to the longitudinal axis (21) of
the feeder opening (18), wherein said two halves (11a, 11b) are
assembled to form the feeder body (11).
14. The feeder insert according to claim 8, further comprising a
shaped part (30) having a through opening (31) that is aligned with
the feeder opening (18) of the feeder body (11), wherein said
shaped part (30) is fixed to the base surface (17) of the feeder
body (11).
15. The feeder insert according to claim 14, wherein the shaped
part (30) is made of metal.
Description
[0001] The invention relates to a feeder insert for use in a
vertically split casting mold that is used for the casting of
metals includes a feeder body, which has an internal cavity as
feeder volume and which is composed of an exothermic and/or
insulating material and which, in the base surface thereof, which
faces toward a pattern inserted into the casting mold during
production of the casting mold, has a feeder opening for connecting
the cavity to the mold cavity of the casting mold, wherein the
feeder body is oriented with its longitudinal axis, which runs
through the feeder opening, at an angle with respect to the
vertically oriented pattern and so as to be horizontal relative to
the pattern, and the volume of the internal cavity is of
asymmetrical design with respect to an imaginary parting plane
running in or parallel to the longitudinal axis.
[0002] A feeder insert with the above-noted features is known from
EP 2 489 450 A1. This feeder insert is already provided and
equipped for insertion into a vertically split casting mold. Such a
vertically split casting mold is known and provided, for example,
in WO 2010/041091 A1. In the frame of manufacturing of these types
of casting molds by means of a correspondingly equipped mold
assembly, described in WO 2010/041091 A1, the feeder insert upon
manufacture of the casting mold is oriented on a vertically
extending pattern or a corresponding pattern plate and shaped into
a quasi-horizontal orientation in the casting mold, so that its
feeder opening likewise is oriented substantially vertically. With
this type of orientation of the feeder insert, the problem is that
when filling the mold cavity that occurs in the molding process by
delivery of the liquid metal from the inner cavity of the feeder
body based on the volume contraction during the setting process of
the metal in the mold cavity, the liquid level of the liquid metal
in the inner cavity of the feeder body can drop to such an extent
that the cross section of the vertical feeder opening no longer is
covered completely by liquid metal. This can have the result that
the region of the already cast-in mold cavity of the casting mold,
connected to the feeder body and connected with its feeder opening,
empties into the inner cavity of the feeder insert. Furthermore,
the feeder module of the feeder insert is reduced, as far as the
inner cavity of the feeder body is emptied too much during the
feeding process.
[0003] In order to counteract this problem, with the feeder insert
described in EP 2 489 450 A1, it is provided that the feeder
opening of the feeder insert is displaced eccentrically downwards,
relative to the longitudinal central axis of the feeder body,
whereby the volume of the inner cavity above the feeder opening is
greater than the volume present below the feeder opening. In
addition, the feeder body can be tilted upwardly with its
longitudinal axis also from the horizontal. In this connection, the
results should be that the feeder opening is covered during the
molding process, respectively, by the liquid metal available in the
inner cavity. The known feeder insert, in addition, has a so-called
Williams core in the form of a projection formed on a wall region
surrounding the inner cavity and projecting with its tip into the
inner cavity. This Williams core is arranged in the region of the
inner cavity of the feeder insert that is positioned above the
feeder opening and which has the greater volume.
[0004] The known feeder insert has the disadvantage, however, that
the feeder body is fixed to the pattern based on its design,
respectively, in the correct orientation or direction. As far as
the feeder body being inserted onto a mold pin located on the
pattern, it is proposed in EP 2 489 450 A1 to provide positive
locking between the mold pin and the feeder body, in order to
permit, respectively, the correct orientation of the feeder body to
the pattern carrying the mold pin. Nevertheless, during orientation
of the feeder insert, errors are not completely eliminated.
[0005] A feeder assembly is disclosed in SU 776 740 A1, in which a
feeder head is formed with a cavity serving to receive liquid metal
and positioned above a feeder insert formed vertically in a casting
mold in which mold sand is placed for formation of the casting
mold. A likewise vertically oriented Williams core projects from a
side wall of the feeder head into the cavity, whose lower surface
facing the feeder insert is spaced relative to the feeder insert
and runs parallel thereto. This type of configuration is not
suitable for a horizontal arrangement and a corresponding design of
the feeder assembly in the casting mold.
[0006] The present invention is therefore based on the object of
providing a feeder insert with the above described types of
features, such that an incorrect or inaccurate orientation of the
feeder insert, during casting in a vertically split casting mold,
is avoided and simultaneously, the advantage of a complete feeding
of the mold cavity is maintained.
[0007] The solution of this object is provided from the content of
the patent claims, which follow this description, and which include
the advantageous embodiments and improvements of the invention.
[0008] The invention contemplates that the feeder body has an
uneven mass distribution with respect to the parting plane with a
center of mass situated to one side of and spaced apart from the
parting plane and that region of the internal cavity of the feeder
body which is situated on that side of the parting plane which is
situated opposite the center of mass has a larger volume than that
region of the internal cavity which is situated on that side of the
parting plane which faces toward the center of mass.
[0009] The present invention offers the advantage that the feeder
insert, based on the uneven mass distribution, is oriented
automatically during casting. If a feeder insert formed according
to the present invention is mounted, for example, on a mold pin
during assembly of the casting pattern, then the feeder insert
rotates automatically, based on the uneven mass distribution, into
a position in which the larger volume portion of the internal
cavity lies above the longitudinal axis of the feeder body running
through the feeder opening. Thus, it must be ensured that the
stored volume of liquid metal above the feeder opening is increased
and sufficiently dimensioned for the feeding process so that the
feeder insert during the feeding process does not run empty.
Simultaneously, in this connection, the cross section of the feeder
opening is covered, respectively, by liquid metal contained in the
internal cavity of the feeder body.
[0010] According to one embodiment of the invention, it is provided
that the uneven mass distribution is realized by the formation of
different wall thicknesses on the feeder body, whereby the region
of the wall area positioned beneath the parting plane with a
horizontal orientation of the feeder body on the vertical pattern
has a greater wall thickness than the region of the wall area of
the feeder body positioned above the parting plane.
[0011] The invention can be realized with feeder inserts, with
which the longitudinal axis of the feeder opening forms the center
axis of the feeder body. Alternatively, however, a design of the
feeder insert is possible, in which the longitudinal axis of the
feeder opening is arranged eccentric to the center axis of the
feeder body, which is already known from the disclosure of EP 2 489
450 A1.
[0012] Furthermore, it can be provided that the feeder body has, in
its cover region that is disposed opposite to the base surface, an
opening that is aligned with the feeder opening and disposed in the
longitudinal axis running through the feeder opening for receiving
a mold pin secured to the pattern inserted in the mold, so that the
feeder insert can be shifted already before casting over the mold
pin, so that the feeder insert during the casting process cannot be
slid out of it. During the casting process, the feeder insert is
displaced then still further in the direction of the longitudinal
center axis of the feeder insert or of the pin supported in it in
the direction of the pattern carrying the mold pin. Thus, in a
known manner, the feeder insert can be mounted on a rigid mold pin
or also on another so-called spring pin.
[0013] For example, based on manufacturing grounds, it can be
provided that the feeder body can comprise two halves that are
separated along a transverse axis running at a right angle to its
longitudinal axis and connected to form the feeder body.
[0014] According to one embodiment of the invention, it is provided
that a shaped part, preferably made of metal and having a
through-opening that is aligned with the feeder opening of the
feeder body, is fixed to the base surface of the feeder body, as is
known from EP 2 489 450 A1. In this regard, the shaped part
fulfills the same object as a feeder insert used in a horizontally
split casting mold.
[0015] In the figures, exemplary embodiments of the present
invention are shown, which are described below. In the
drawings:
[0016] FIG. 1 shows a feeder insert in a position associated with a
vertical mold form half in a lateral sectional view,
[0017] FIG. 2 shows the subject matter of FIG. 1 with a mold part
forming its feeder foot.
[0018] The feeder insert 10 shown in FIG. 1 has a feeder body 11,
which includes a wall area 13 surrounding an internal cavity 12 as
a so-called feeder volume and a cover region 14. The feeder body
has an outer surface 16 and an inner surface 15 of the wall area 13
surrounding the inner cavity 12 as well as a base surface 17, in
which a feeder opening 18 is formed.
[0019] The feeder insert 10 shown in a "horizontal" arrangement
should be associated with a vertical casting mold half 20, whereby
the feeder insert can be mounted on a mold pin (not illustrated)
formed on a pattern inserted in the casting mold. The mold pin
engages through the feeder opening 18 into the base surface 17 and
extends into the cover region 14 of the feeder insert 10, whereby
in this cover region 14, an opening 22 for receiving the tip of the
mold pin is formed. During casting, the tip of the mold pin could
puncture the remaining cross section of the cover region in the
opening 22. This, however, is also known from the state of the
art.
[0020] It is clearly recognizable that the region 26 of the wall
area 13 disposed above an imaginary parting plane 25, which
coincides with the longitudinal axis 21 of the feeder opening 18,
which in the embodiment shown in the drawing, forms simultaneously
the longitudinal center axis of the feeder body 11 and extends into
the plane of the drawing, has a clearly thin material thickness and
therefore, markedly less mass than the region 27 of the wall area
13 disposed below the parting plane 25, so that the center of mass
(which is not specifically defined in the drawing) of the entire
wall area 13 of the feeder insert 10 lies, if necessary, below the
parting plane 25. This has the result that the feeder insert 10
after mounting onto a mold pin, before compression of the mold
material applied into the casting mold, necessarily rotates into
such a position, in which the heavier region 27 of the wall area
13, based on the effects of gravity, is lying always below the
parting plane 25 of the longitudinal axis of the mold pin.
[0021] At the same time, the internal cavity 12 of the feeder
insert with reference to the longitudinal axis 21 is asymmetrically
formed, whereby the region 28 of the internal cavity 12 positioned
on the side of the parting plane 25 opposite to the center of mass
has a greater volume that the region 29 of the hollow cavity
positioned on the side of the parting plate 25 facing toward the
center of mass. Since as described, the feeder insert 10 upon
mounting onto a mold pin is oriented such that the heavier region
27 of the wall area 13 is positioned below the longitudinal axis of
the mold pin, this necessarily results in the region 28 of the
internal cavity 12 with the greater volume lying above the
longitudinal axis 21 of the parting plane 25. Thus, it is ensured
that based on additional and upwardly displaced volume of the
internal cavity 12, compared to typical symmetrical feeder inserts,
the volume of liquid metal to be received by the feeder inserts 10
can be increased to the point that the volume for one feed is
dimensioned sufficiently without the feeder insert 10 running empty
and its feeder opening 18 is kept clear.
[0022] From FIG. 1, it can further be seen that based on grounds of
a more simple manufacturing, the feeder body 11 comprises two
halves 11a, 11b separated along a transverse axis 23 running at a
right angle to its longitudinal axis 21 and connected to form the
feeder body 11, which can be manufactured as individual parts,
respectively.
[0023] The embodiment shown in FIG. 2 differs from the previously
described embodiment merely in that on the base surface 17 of the
feeder insert 10, a preferably metallic shaped part 30 is arranged
and is connected with the base surface 17, preferably by an
adhesive, which has a hat-shaped or also cylindrical design and has
a through-opening 31 aligned with the base opening 17 of the feeder
insert 10. This type of design including such a shaped part 30,
which also can be formed to be deformable, corresponds in this
regard with the related state of the art. The features of the
subject matter of this specification disclosed in the foregoing
description, the patent claims, the abstract and the drawings can
be important individually as well as in any combination with one
another for realization of the present invention in its various
embodiments.
* * * * *