Cutting – Rotatable disc tool pair or tool and carrier – With means to support work relative to tool
Reexamination Certificate
2000-01-28
2003-07-22
Shoap, Allan N. (Department: 3724)
Cutting
Rotatable disc tool pair or tool and carrier
With means to support work relative to tool
C083S488000, C083S698510
Reexamination Certificate
active
06595094
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a work cutting apparatus and a method for cutting a work, and specifically to a work cutting apparatus and a method for cutting a sintered compact such as a magnet.
2. Description of the Related Art
FIG. 22
shows a conventional work cutting apparatus for obtaining a magnet used in a voice coil motor for example. This work cutting apparatus
1
is an overhang model of a so-called cantilever type. A rotating shaft
2
is mounted with a plurality of cutting blades
3
spaced from each other by spacers (not illustrated). The rotating shaft
2
has an end portion supported by a support arm
4
. The work cutting apparatus
1
includes an X-slider
6
slidably placed on rails
5
. The X-slider
6
has an upper surface provided with a chuck table
7
. The chuck table
7
has an upper surface provided with a pasting board
8
. The pasting board
8
has an upper surface placed for example with a plurality of works
9
fixed by an adhesive. Then, the X-slider
6
is slid in a direction shown by an arrow A (along an X axis), so that the works
9
are moved at a constant speed toward the cutting blades
3
rotating in a direction shown by an arrow B, thereby cutting the works
9
into a predetermined thickness. Since the works
9
are cut by the plurality of cutting blades
3
, a plurality of magnet pieces are obtained in a single cycle of cutting operation.
In the work cutting apparatus
1
, the cutting blades
3
should ideally be mounted at exact right angle to the rotating shaft
2
. In such a case, a cutting reaction will only develop within surfaces of the cutting blades, or no force causing the cutting blade
3
to deform vertically to a rotating plane of the cutting blade
3
is generated. Actually however, as shown in
FIG. 23
, there is involved a cutting blade mounting error &thgr; (&thgr;=0.02-0.04 degree approx.), and therefore the cutting reaction f. The cutting reaction f includes a tangential component force f
1
, which includes a component force f
2
corresponding to the mounting error (f
2
=f
1
×sin &thgr;) acting as the force to deform the cutting blade
3
. As a result, the cutting blade
3
is deformed, and cutting accuracy is reduced.
Further, according to the convention, as shown in
FIG. 24
, a stroke L
2
of the cutting blade
3
necessary for the cutting is long, and therefore a long time is required for the cutting operation, posing a problem of poor operability.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a work cutting apparatus and a method for cutting a work capable of improving the cutting accuracy and productivity.
According to an aspect of the present invention, there is provided a work cutting apparatus for cutting a work by rotation of a cutting blade, comprising: a first driving portion rotating the cutting blade, and a second driving portion moving at least either one of the cutting blade and the work relative to the other in the vertical direction when cutting.
According to another aspect of the present invention, there is provided a method for cutting a work, comprising: a first step of placing the work at a predetermined position; a second step of preparing a cutting blade; and a third step of rotating the cutting blade, moving at least either one of the cutting blade and the work relative to the other in the vertical direction, whereby cutting the work with the cutting blade.
According to the present invention, by a cutting through lowering the rotating cutting blade for example down to the work disposed at a predetermined position, it becomes possible to reduce the force that deforms the cutting blade than in the convention. Thus, load acting on the cutting blade becomes smaller, deformation of the cutting blade becomes smaller, resulting in improved accuracy of a cut surface. Further, since a stroke of the cutting blade necessary for the cutting can also be reduced, cutting time can be reduced, and productivity is improved.
According to still another aspect of the present invention, there is provided a work cutting apparatus for cutting a work by rotation of a cutting blade, comprising: a first driving portion rotating the cutting blade, and a second driving portion moving at least either one of the cutting blade and the work relative to the other along a normal line passing the point of contact between the cutting blade and the work when cutting.
According to another aspect of the present invention, there is provided a method for cutting a work, comprising: a first step of placing the work at a predetermined position; a second step of preparing a cutting blade; and a third step of rotating the cutting blade, moving at least either one of the cutting blade and the work relative to the other along a normal line passing the point of contact between the cutting blade, whereby cutting the work with the cutting blade.
In this case again, in which the cutting is made along a normal line passing the point of contact between the rotating cutting blade and the work disposed at a predetermined position, the load to the cutting blade becomes smaller. Therefore, deformation of the cutting blade becomes smaller, resulting in improved accuracy of the cut surface. Further, since the stroke of the cutting blade necessary for the cutting can also be reduced, the cutting time can be reduced, and productivity is improved.
According to the present invention, preferably, the cutting blade is mounted to a rotating shaft, and the rotating shaft has two end portions supported by a supporting portion mounted to a unit. By supporting at both end portions of the rotating shaft, it becomes possible to hold the cutting blade more stably, thereby reducing the deflection of the cutting blade during the cutting operation. Therefore, when cutting a brittle work such as a sintered compact, chipping can be reduced, and cutting accuracy can be improved. Further, since the deflection of the cutting blade can be reduced, the number of cutting blades to be mounted to the rotating shaft can be increased. As a result, the number of pieces obtained by a single cutting operation can be increased, and therefore productivity can be increased. Further, since the supporting portion supporting both end portions of the rotating shaft is mounted to one unit, holding accuracy of the cutting blade, particularly horizontal accuracy can be improved.
Further, preferably, the supporting portion includes a first supporting portion and a second supporting portion respectively supporting the two end portions of the rotating shaft. The first supporting portion is mounted movably to the second supporting portion.
Further, preferably, the rotating portion includes an arbor having two tapered end portions, and rotation supporting portions each having a receiving portion mated with one of the tapered end portions of the arbor. By forming the taper at each end portion of the arbor of the rotating shaft, and by mating each tapered end portion to the receiving portion, fixing accuracy of the cutting blade can be improved.
Further, preferably, the first driving portion includes a belt for rotating the cutting blade by belt transmission, and a tension adjusting portion for adjusting tension of the belt. By maintaining the tension of the belt always at a constant level by the tension adjusting portion, slippage of the belt can be prevented, and rotation of the belt can be stabilized. This is particularly effective in an arrangement in which the cutting is made by moving the cutting blade toward the work.
According to the present invention, preferably, a plurality of works are disposed on a recess of a work disposing portion. With such an arrangement, a large number of works can be cut at one time.
Further, preferably, the recess has a V-shaped section in at least either one of a plane including the cutting blade and a plane parallel thereto. By making the recess to have the V-shaped section, cost of machining the work disposing portion can be reduced, and app
Chikuba Masanori
Hiyoke Toshifumi
Kondo Sadahiko
Ozaki Sajio
Sasaki Toshiaki
Choi Stephen
Shoap Allan N.
Sumitomo Special Metals Co. Ltd.
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