JPS61168465A - Rolling cutter - Google Patents

Abstract

PURPOSE:To enable cutting of long material by extending a blade in tangential direction in a plane crossing perpendicularly with the central axis of rolling while arranging an arched cutter rotatably on the endface near to the central axis thereby eliminating abrasion and stepped terminal due to abrasive grains of blade. CONSTITUTION:When machining, a work 6 is pushed up by a work holder 7 to contact with the cutter 15 of the blade 13. Upon rolling of rolling device 11 around the rotary shaft 10 by means of a drive unit as shown by the arrows 16, 17, the work 6 is cut by the cutter 15. Consequently, snaking of blade 13 and partial abrasion of the cutter 15 will never occur to enable cutting of work 6 over the entire length by moving back and fro after cutting without restriction of length. While since the work 6 is separated from the blade 13, the abrasive grains will permeate well to improve the cutting performance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cutting device suitable for performing lapping cutting using free abrasive grains on, for example, hard and brittle materials.

[Conventional technology]

A typical cutting device of this type is called a blade saw. In conventional blade nos, a blade with a cutting edge is moved back and forth horizontally from side to side, and abrasive grains are flowed from above.

This cuts the article.

[Problem that the invention seeks to solve]

However, conventional blade saws have the following drawbacks. (,) A guide portion is required to guide the reciprocating motion of the blade, and the blade may meander by the gap between the guide surface and the blade, resulting in poor cutting accuracy. (b) Since there are sliding parts, abrasive grains may enter the sliding parts and cause wear. (c) When cutting a long workpiece, the guide part of the sliding part gets in the way, making it impossible to cut the long workpiece. (d) The cutting edge of the blade has a step at the end of the stroke due to wear, which causes chips at the end of the workpiece.

These will be explained using FIGS. 4 and 5. Since the blade 1 makes a horizontal reciprocating motion, it requires a sliding part 4 and a guide 5, and therefore the length t of the workpiece 6 is limited by them, as is clear from FIG. Since the workpiece 6 is hydraulically or mechanically pushed upward via the workpiece holder 7 and brought into contact with the blade 1, the blade 1 is always in contact with the workpiece 6.

Since there are few gaps between these, it is difficult for the abrasive liquid to enter.

In addition, the rod 3 that causes the blade 1 to move horizontally is operated by a cam mechanism (not shown), so it reciprocates over a fixed length.
．． Therefore, the blade 1 wears in a stepped manner as shown in FIG. 6, which causes chipping and chipping at both ends of the workpiece 6.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an oscillating cutting device which eliminates the above-mentioned drawbacks.

[Means and operations for solving the problem] According to the present invention, a swinging device supported swingably around one end, a blade holding device provided at the other end of the swinging device,
a blade held by the blade holding device, the blade extending in a tangential direction within a plane orthogonal to the central axis of rocking of the rocking device, and having an end face near the central axis of rocking. There is obtained a swing-type cutting device characterized in that it has a cutting blade, and the cutting blade is formed along an arc centered on the swing center axis.

〔Example〕

1 and 2 show an embodiment of a swing-type cutting device according to the present invention. The illustrated cutting device is a U-shaped swinging device 1.
Contains 1. The rocking device 11 has its lower end connected to a horizontal rotating shaft 1.
It is swingably supported by 0. A pair of blade holding devices 12 are provided at the upper end (three locations) of the swinging device 11. A plurality of blades 13 are held in parallel between these blade holding devices 12 and spaced apart from each other.

The blade holding device 12 includes a tension adjustment bolt 14 so that the tension of the blade 13 can be adjusted.

Grade 13 is made of a strip of the same material as the conventional one, and has a cutting blade 15 on the lower end surface. As can be seen from FIG. 3, this cutting blade 15 is formed along an arc centered on the single rotation axis 10.

During machining work, the workpiece 6 is pushed upward by the workpiece holder 7 as in the conventional case, and the cutting edge 1 of the blade 13
5.

Then, the swing device 11 is caused to swing by a drive device (not shown) or the like about the rotating shaft 10 as indicated by arrows 16° and 17. Then, the workpiece 6 is cut by the cutting blade 15.
is disconnected.

Note that it is preferable that the swinging angle of the swinging device 11 is sufficiently large as well as the angle formed by both ends of the cutting blade 15 formed along a circular arc with the rotation axis 10 as the center.

According to the above structure, the meandering of the blade 13 and the cutting edge 1
5. No local wear. Further, the length of the workpiece 6 is not limited, and the entire length of the workpiece can be cut by moving the workpiece back and forth after cutting. Furthermore, it is easily understood that, as shown in FIG. 1, there is a gap between the workpiece 6 and the blade 13, so that the abrasive liquid can penetrate well and, therefore, the cutting performance is improved. Further, since the wear of the blade 13 becomes uniform as shown by the broken line in FIG. 3, the chipping caused by the wear will also be small.

Next, explanation will be given using specific numerical values. Outer diameter 100 tan
.

A ferrite single crystal with a length of 800 wm and a thickness of 1 mm.
50 wafers were cut. Machining conditions are blade thickness 0, 2
m, a reciprocating average speed of 150 wan per second, a load of 200 gr/blade, an abrasive liquid GO of 3000, and a 20% lapping solution. As a result, traditional cutting equipment
The wafer thickness tolerance was ±0.2 tan, and chipping at the periphery of up to 20μ occurred in 35 out of 50 wafers.

With the cutting device according to the present invention, when cutting under the same conditions,
The variation in wafer thickness is ±0.1 or less.

Peripheral chipping was less than 5μ for all 50 sheets.

〔Effect of the invention〕

As explained above using the embodiments, according to the cutting device of the present invention, the movement of the blade is changed to rotational movement, so there is no sliding part, there is no risk of meandering of the blade and wear due to abrasive grains, and Since there is no guide for moving parts, it is also possible to cut long objects. Furthermore, since the cutting blade of the blade is formed along an arc with the axis of rotation as its radius, there is no difference in wear due to the end point of the reciprocating motion, and the blade wears out uniformly.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a top view, FIG. 3 is a front view showing the shape of the blade used in the embodiment, and FIG. 4 is a front view of a conventional cutting device. An example front view,
FIG. 5 is also a top view, and FIG. 6 is a front view of the blade no used in FIG. 4. DESCRIPTION OF SYMBOLS 10... Rotating shaft, 11... Rocking device, 12... Blade holding device, 13... Blade, 15... Cutting blade.

Claims (1)

[Claims] 1. A rocking device supported so as to be rockable around one end; a blade holding device provided at the other end of the rocking device;
a blade held by the blade holding device, the blade extending in a tangential direction within a plane orthogonal to the central axis of rocking of the rocking device, and having an end face near the central axis of rocking. A swing-type cutting device comprising a cutting blade, the cutting blade being formed along an arc centered on the swing center axis.