U.S. patent application number 10/090729 was filed with the patent office on 2002-11-28 for cutting-off apparatus.
This patent application is currently assigned to Shiga Yamashita Co., Ltd.. Invention is credited to Harikawa, Takao.
Application Number | 20020174758 10/090729 |
Document ID | / |
Family ID | 26607512 |
Filed Date | 2002-11-28 |
United States Patent
Application |
20020174758 |
Kind Code |
A1 |
Harikawa, Takao |
November 28, 2002 |
Cutting-off apparatus
Abstract
An apparatus A for cutting off an unnecessary object deposited
on a casting includes a motor having a rotary shaft 3 adapted to be
rotated at a high speed, and a disk-shaped diamond tip saw 2
mounted at a tip end 4 of the rotary shaft 3 and adapted to be
rotated by the rotation of the rotary shaft 3 to cut off the
unnecessary object 9 on the casting 8, so that the tip saw 2 is
rotated at a rotational speed in a range of 6,000 rpm to 8,000 rpm.
Thus, the rigidity of the diamond tip saw 2 rotated at the high
speed is increased by a centrifugal force provided by the diamond
tip saw 2 itself and a gyroscopic moment effect to reduce the
thickness of the diamond tip saw 2 can be reduced by a value
corresponding to an increment in rigidity of the tip saw 2, whereby
the amount of diamond tips (diamond blades) used can be decreased;
an energy-saving for a cutting power can be achieved, and the
amount of chips produced upon the cutting of the unnecessary object
can be reduced.
Inventors: |
Harikawa, Takao; (Shiga
Prefecture, JP) |
Correspondence
Address: |
BANNER & WITCOFF
1001 G STREET N W
SUITE 1100
WASHINGTON
DC
20001
US
|
Assignee: |
Shiga Yamashita Co., Ltd.
338 Nakaono Uriuzu-cho
Yokaichi-shi
JP
|
Family ID: |
26607512 |
Appl. No.: |
10/090729 |
Filed: |
March 6, 2002 |
Current U.S.
Class: |
83/835 |
Current CPC
Class: |
B23D 45/26 20130101;
B23D 61/025 20130101; Y10T 83/9319 20150401 |
Class at
Publication: |
83/835 |
International
Class: |
B22D 031/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 28, 2001 |
JP |
2001-300250 |
May 28, 2001 |
JP |
2001-003355 |
Claims
What is claimed is:
1. An apparatus for cutting off an unnecessary object deposited on
a casting, comprising a rotary device having a rotary shaft adapted
to be rotated at a high speed, and a disk-shaped diamond tip saw
mounted at a tip end of the rotary shaft and adapted to be rotated
by the rotation of the rotary shaft to cut off the unnecessary
object on the casting, so that the tip saw is rotated at a
rotational speed of 4,000 rpm or more, whereby the amount of
diamond tip used can be reduced; an energy-saving for a cutting
power can be achieved, and the amount of chips produced upon the
cutting of the unnecessary object can be reduced to decrease the
useless amount of a material for the casting.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to an apparatus for cutting
off an unnecessary object deposited on any of various castings such
as automobile parts produced from an aluminum alloy or the like by
a casting process, and particularly, to an apparatus for cutting
off an unnecessary object, which includes a diamond tip saw for
cutting off an unnecessary object such as a gate of a casting, and
a rotary device such as a motor for rotating the tip saw. More
particularly, the present invention relates to an apparatus for
cutting off an unnecessary object deposited on a casting, which
includes a diamond tip saw for cutting off an unnecessary object
such as a gate deposited on a casting, and a rotary device such as
a motor for rotating the tip saw at a high speed, wherein the
amount of diamond tips used can be reduced; an energy-saving for a
cutting power can be achieved, and the amount of chips produced
upon the cutting of the unnecessary object can be reduced to
decrease the useless amount of a material for the casting.
[0003] 2. Description of the Related Art
[0004] In general, various parts for an automobile, e.g., a
cylinder head, a cylinder block, an intake manifold and the like
are produced from an aluminum alloy by a casting process. A casting
produced by such casting process has an unnecessary object such as
a gate deposited thereon, and it is necessary to cut off the
unnecessary object from the casting, thereby remarkably reducing
the production cost for the casting.
[0005] There is such a conventionally known cutting-off apparatus
which includes a diamond tip saw mounted at a tip end of a rotary
shaft of a rotary device such as a motor, so that the diamond tip
saw is rotated at a high speed by driving the rotary device to cut
off an unnecessary object deposited on a casting.
[0006] In the conventional apparatus, the rotational speed of the
diamond tip saw is in a range of 1,000 to 3,600 rpm, but in order
to prevent the occurrence of a vibration during the cutting, the
thickness of the tip saw is required to be on the order of 6 to 8
mm, if the diameter of the tip saw is on the order of 400
.phi..
[0007] The present inventors have found that if the rotational
speed of the tip saw is increased to 4,000 rpm or more, an increase
in rigidity of the tip saw is provided remarkably by a centrifugal
force provided by the tip saw itself and a gyroscopic moment effect
and as a result, the thickness of the tip saw can be decreased by a
value corresponding to an increment in rigidity of the tip saw.
Thus, the present invention has been accomplished from the above
finding.
SUMMARY OF THE INVENTION
[0008] Accordingly, it is an object of the present invention to
provide an apparatus for cutting off an unnecessary object
deposited on a casting, which includes a diamond tip saw for
cutting off an unnecessary object such as a gate deposited on a
casting, and a rotary device such as a motor for rotating the tip
saw at a high speed, wherein the amount of diamond tip used can be
reduced; an energy-saving for a cutting power can be achieved, and
the amount of chips produced upon the cutting of the unnecessary
object can be reduced.
[0009] To achieve the above object, according to the present
invention, there is provided an apparatus for cutting off an
unnecessary object deposited on a casting, comprising a rotary
device having a rotary shaft adapted to be rotated at a high speed,
and a disk-shaped diamond tip saw mounted at a tip end of the
rotary shaft and adapted to be rotated by the rotation of the
rotary shaft to cut off the unnecessary object on the casting, so
that the tip saw is rotated at a rotational speed of 4,000 rpm or
more, whereby the amount of diamond tip used can be reduced; an
energy-saving for a cutting power can be achieved, and the amount
of chips produced upon the cutting of the unnecessary object can be
reduced to decrease the useless amount of a material for the
casting, thereby remarkably reducing the production cost for the
casting and overcoming the disadvantage associated with the
conventionally known technology.
[0010] With the above arrangement, by increasing the rotational
speed of the diamond tip saw to 4,000 rpm or more, an increase in
rigidity of the diamond tip saw is provided remarkably by a
centrifugal force provided by the tip saw itself and a gyroscopic
moment effect and as a result, the thickness of the tip saw can be
decreased by a value corresponding to an increment in rigidity of
the tip saw, for example, to 2.5 mm from the range of 6 mm to 8 mm,
thereby reducing the cost.
[0011] The above and other objects, features and advantages of the
invention will become apparent from the following description of
the preferred embodiment taken in conjunction with the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 is a perspective view of an embodiment of a
cutting-off apparatus according to the present invention; and
[0013] FIG. 2 is an enlarged sectional view of a portion of the
apparatus shown in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0014] The present invention will now be described by way of an
embodiment with reference to FIGS. 1 to 3.
[0015] FIG. 1 shows a cutting-off apparatus A according to the
present invention. The cutting-off apparatus A includes a rotary
device 1 such as a motor and a disk-shaped diamond tip saw 2. The
motor 1 (rotary device) includes a rotary shaft 3 having the
disk-shaped diamond tip saw 2 mounted at its tip end 4. The rotary
shaft 3 of the motor 1 is rotated at a high speed by driving the
motor 1, and the disk-shaped diamond tip saw 2 mounted at the tip
end 4 of the rotary shaft 3 is also rotated at a high speed with
the rotation of the rotary shaft 3.
[0016] The disk-shaped diamond tip saw 2 has a tip saw body 5
provided at its peripheral edge with a large number of tips 6
arranged in a circumferential direction, as shown in FIG. 2 which
is an enlarged side view of a portion indicated by a in FIG. 1, and
diamond blades 7 are mounted to the tips 6, respectively. Each of
the diamond blades 7 has a size of, for example, 4 mm.times.4
mm.times.1 mm and mounted to carbide portions 10.
[0017] The diamond tip saw 2 is rotated in more than 4000 rpm,
preferably in the range of 4000 rpm to 10,000 rpm, by the rotation
of rotating shaft 3 by a motor 1, to cut-off and to remove an
unnecessary object 9 deposited on a casting 8, such as a cylinder
head of the engine parts of a car, when casting 8, such as aluminum
alloy is produced, as illustrated in FIG. 1.
[0018] The diamond tip saw 2 rotated at the high speed has a
rigidity remarkably increased by its own centrifugal force and a
gyroscopic moment effect, and the thickness of the diamond tip saw
2 can be reduced by a value corresponding to the increment in the
rigidity. More specifically, in a prior art cutting-off apparatus
including a tip saw having a size on the order of 300 to 400 .phi.
and a cutting shaft rotated at a rotational speed of 1,800 rpm, the
thickness of the tip saw is required to be on the order of 6 mm to
8 mm, but according to the present invention, when a gate having an
area to be cut of 50 mm.times.100 mm is cut at a cutting shaft
rotational speed of 7,000 rpm and at a feed rate of 30 mm/sec, the
thickness of the tip saw can be 2.5 mm.
[0019] By reducing the thickness of the tip saw to 2.5 mm from the
range of 6 mm to 8 mm as described above, the amount of diamond
tips used is decreased to 4 mm.times.4 mm.times.1 mm, and an
energy-saving for a cutting power, i.e., a cutting power provided
by the motor 1 shown in FIG. 1 is achieved, and the amount of chips
produced from a cut portion 11 upon cutting of an unnecessary
object 9 on a casting 8 is decreased. This can contribute to a
reduction in production cost of the casting. Reference character 12
in FIG. 1 designates clamps 12 secured to a support plate 13 for
clamping and retaining the casting 8. Clamps 12 are also mounted to
a support plate 13 of an opposed device (not shown) to clamp and
retain the casting 8 from opposite sides.
[0020] Although the embodiments of the present invention have been
described in detail, it will be understood that the present
invention is not limited to the above-described embodiments, and
various modifications in design may be made without departing from
the spirit and scope of the invention defined in claims.
* * * * *