JPH048469A - Cutting method for fragile material - Google Patents

Abstract

PURPOSE:To reduce the extent of cutting force and hold the occurrence of chipping down to less than about 10 mum as well as to prevent generation of dust by forming an incline in the upper part of a cutting surface with a V-shaped blade in advance, then making a part of the titled cutting part of this V-shaped blade congruous with the incline, and performing the cutting along the cutting surface. CONSTITUTION:An incline 10c is formed in the upper part of each of cutting surfaces 10a, 10b by cutting with a V-shaped blade 100 in advance. Next, a part of cutting parts 100a, 100b titled of this V-shaped blade 100 is cut along these cutting surfaces 10a, 10b after making it congruous with the incline 10c. With this constitution, cutting force is reduced, while the occurrence of chipping is held down to about 10 mum, thereby preventing generation of dust.

Description

[Detailed Description of the Invention] Industrial Hand 1 The present invention relates to a cutting method for cutting a brittle material into a desired shape, and particularly relates to a cutting method for cutting a brittle material into a desired shape. The present invention relates to a cutting method that can be suitably employed for tip dicing, round cutting, etc. in the manufacturing process of the laminated magnetic head used.

Wish for two dishes I In recent years, digital audio, VTR1) IDD, etc. have excellent characteristics in the high frequency region and are capable of high-density recording.
The practical use of high-output, low-noise multilayer magnetic heads consisting of a nonmagnetic substrate, a magnetic alloy thin film, and a nonmagnetic substrate is progressing.

The manufacturing of such a laminated magnetic head is described in detail in, for example, Japanese Patent Laid-Open No. 62-33309, but to briefly explain, as shown in FIG. A lamination substrate 3 on which an alloy thin film 2 is formed is produced, and after forming a glass film 4 as a contact layer on the surface of each lamination substrate 3, usually about 8 to 14 sheets are stacked on each other. , a laminate 6 is formed. The laminate 6 has 5
By applying pressure in the direction of the arrow at 00 to 800°C,
The laminated substrates 3 are welded to each other by the melted glass film 4 to form a laminated block.

Next, the laminated block is cut in the direction along the lamination direction to produce a laminated head bead, which is an intermediate product of the magnetic head.The laminated head bead is then subjected to grooving, bonding, etc., and has a surface R finish. A magnetic head 7, which is an intermediate body, as shown in FIG. 6 is manufactured. Thereafter, the intermediate magnetic head 7 is subjected to a tip dicing process and a round cutting process to complete a laminated magnetic head as shown in FIG. 7.

At present, a nonmagnetic ceramic substrate is used as the nonmagnetic substrate 1 of such a laminated magnetic head due to its durability and other various reasons.

Such non-magnetic ceramic substrates are very hard (and have excellent wear resistance), but are brittle materials and have problems in efficiently performing tip dicing and round cutting.

That is, generally, as shown in FIG. 8, the tip dicing process (A) and the round cutting process (B) are performed with a blade G having diamond abrasive grains, as shown in FIG. However, the cutting edge g of the blade is a so-called straight blade that is finished parallel to the processing surface of the workpiece 8, and the cutting resistance during processing is extremely large. Furthermore, what is important is that when the workpiece surface is vertically cut with a straight blade, chipping occurs at the corner C of the workpiece 8, that is, chipping of the non-magnetic ceramic substrate 1.
Or peeling may occur.

According to research by the present inventor, these chippings are 20 to 3
It was found that the size reached even 0 μm.

These chippings not only become a source of dust, but also create problems such as destroying the gap 9 (FIG. 7).

Furthermore, even at corners where it appears that no chipping occurs during workpiece machining, considerable machining stress is applied to the corners, so there are some locations that are on the verge of destruction, and the magnetic head must be When incorporated into equipment, chipping could occur during operation.

In order to avoid such problems, it became necessary to increase the machining clearance Δh and eliminate the chipping forming portion.

Therefore, an object of the present invention is to provide a method for processing brittle materials that reduces cutting resistance, reduces chipping to 10 μm or less, and does not generate dust. Another object of the present invention is to provide a processing method that can eliminate adverse effects on the gap during round cutting.

The above objects are achieved by the method for cutting a brittle material according to the present invention. In summary, the present invention involves forming an inclined surface in advance using a ■-shaped blade on the upper part of the cut surface formed by cutting, and then attaching a part of the inclined blade part of the ■-shaped blade to the inclined surface. A brittle material that is adapted to be cut along the cutting surface.
This is a cutting method.

Next, the method for cutting brittle materials according to the present invention will be explained in more detail with reference to the drawings. This embodiment will be described in connection with tip dicing and round cutting of a laminated magnetic head, but the present invention is not limited to this embodiment.

Referring to FIG. 1(A), for example, the tip of the intermediate magnetic head 7 (hereinafter referred to as "workpiece") as shown in FIG. ) is illustrated.

The workpiece 7 is subjected to a tip dicing process and a round cutting process to complete a laminated magnetic head as shown in FIG. 7. However, the workpiece 7 in FIG. The shape of the tip portion is illustrated by a dashed line.

According to the present invention, as a blade for cutting processing, unlike a conventional straight blade, a ■-shaped blade 100 is provided with blade portions 100a and 100b having a 7-shaped tip.
is used. (2) Any shape can be used as the blade 100, but in this embodiment, the tip angle θ is 90
°, thickness T is 2004xm, grain size is 91000
(for round cutting), #2000, or #2500 (for tip dicing) was used.

In the tip dicing process, first, the rotating ■-shaped blade 100 is cut into the surface of the workpiece 7 to a predetermined depth h.
Form a ■-shaped groove 102 having a shape (Fig. 1 (b)
(c)) The V-shaped groove 102 has an inclined surface 10 on one side thereof.
2a forms a chamfer (sloped surface) 10c on the upper part of the desired cut surface 10a of the workpiece 7.

Next, in order to form the desired cutting surface 10a, the blade portion 100a of the ■-shaped blade 100 is moved to the left by a distance W in FIG. , cut toward the workpiece 7 (Fig. 1 (
D)) As a result, as shown in FIG. come into contact with In this state, when the ■-shaped blade 100 is cut downward, one blade part 100 of the ■-shaped blade 100
a comes into contact with the inclined surface 102a of the ■-shaped groove 102 of the workpiece 7 in a line or plane (FIG. 1 (f)), and by cutting the V-shaped blade 100 downward (the
Figure (G)) (1) Shape A desired cutting surface 10a is formed by the blade portion 100a of the blade 100 (Figure 1 (H)).

The bottom surface 12a of the workpiece 7 is formed by moving the square-shaped blade 100 toward the left side in FIG. 1 at a predetermined pitch and cutting it.

The cut surface 10b is formed by similarly performing the steps shown in FIGS. Through this tip dicing process, a tip tip portion of the chip having a convex shape of a laminated magnetic head as shown in FIG. 2 is formed.

Furthermore, as shown in FIG. 2, using the inclined surface 10d formed by the tip dicing process, round cutting is performed using the ■-shaped blade 100' for round cutting in the same manner as described above. Processing is performed. By such cutting processing, a laminated magnetic head as shown in FIG. 7 is manufactured.

As described above, according to the present invention, when a desired cut surface is formed (in the case of cutting), a chamfer (slope) is formed above the desired cut surface in advance by forming a After that, the cutting surface of the ■-shaped blade lOO is fitted to the desired inclined surface, and the cut surface is cut.Therefore, when processing the desired cut surface, the upper corner of the cut surface According to the results of research experiments conducted by the present inventors, the occurrence of chipping is suppressed, and even if chipping occurs, the results of research experiments conducted by the present inventors show that
It was less than μm.

Furthermore, according to the present invention, as can be understood from FIGS. In order to start cutting, the shape blade 100 does not shake, and as shown in FIG. can be formed. Furthermore, as a matter of course, Figure 1 (
As shown in b), the first cutting into the workpiece 7 starts with point contact, which has the advantage of low cutting resistance and stable directionality. have.

Another embodiment of the invention is shown in FIG.

According to this embodiment, first, the ■-shaped blade 100 is cut into the surface of the workpiece 7 to cut the workpiece 7 at a distance W from the desired cutting surface 10a. A square 101 having the shape of ■ is formed at a distance of
, (c)).

Next, the ■-shaped blade 100 is moved to the right side by W in FIG. 3 and pushed down toward the surface of the workpiece 7 (FIG. 1 (d)). By hitting the corner 101a of the groove 101 and further cutting with the V-shaped blade 100, the corner 1 of the groove 101 is cut.
An inclined surface 102a is formed on 01a. The inclined surface 102a
is a chamfer 10c on the upper part of the desired cut surface 10a of the workpiece 7.
(Fig. 3 (e)).

Next, in order that the blade portion 100a of the ■-shaped blade 100 can form a desired cutting surface 10a, a distance W is placed on the left side in FIG.
2 and cut toward the workpiece (Fig. 3)
). As a result, one blade portion 1 of the ■-shaped blade 100
00a comes into contact with the inclined surface 102a of the groove 102 of the workpiece 7 in a line or plane, and further the ■-shaped blade 10
By cutting 0 downward, a desired cutting surface 10a is formed by the blade portion 100a of the square-shaped blade 100.

These steps are shown in FIGS. 1(d) to (d) for the previous example.
This is the same as explained with reference to (g).

If the process shown in FIG. 3(f) is performed using a straight blade instead of the V-shaped blade 100, the straight blade will come into contact with the inclined surface 102a at a point, and cutting stress will be concentrated at this part. , chipping will occur on the inclined surface 102a. Therefore, the use of straight blades should be avoided.

The bottom surface 12a of the workpiece 7 is formed by moving the square-shaped blade 100 toward the left side in FIG. 3 at a predetermined pitch and cutting it.

The cut surface 10b is formed by similarly performing the steps shown in FIGS.

Further, by performing round cutting in the same manner as described in connection with FIG. 2, a laminated magnetic head as shown in FIGS. 4 and 7 is formed.

According to this embodiment, compared to the previous embodiment, FIG.
Although the steps (d) to (d) are increased, the same effects as in the previous embodiment can be achieved, and furthermore, the cutting resistance during cutting of the cut surface 10a shown in FIG. 3 (f) is reduced, It has the advantage that a clean cut surface 10a with high precision can be obtained.

The method for cutting brittle materials according to the present invention configured as described above can reduce cutting resistance, reduce the occurrence of chipping to 10 μm or less, and eliminate the generation of dust. The present invention has the advantage that it can eliminate any adverse effects on the gap during tip dicing and round cutting of a multilayer magnetic head.

[Brief explanation of the drawing]

FIGS. 1A to 1H are process explanatory diagrams illustrating an embodiment of the cutting method for brittle materials according to the present invention. FIG. 2 is a diagram illustrating the round cutting process performed according to the present invention. FIGS. 3A to 3F are process explanatory diagrams illustrating another embodiment of the method for cutting a brittle material according to the present invention. FIG. 4 is a side view of the tip of a magnetic head formed in accordance with the present invention. FIG. 5 is a perspective view of a stacked body for forming a stacked magnetic head. FIG. 6 is a perspective view of the intermediate magnetic head. FIG. 7 is a perspective view of the magnetic head. FIG. 8 is an explanatory diagram for explaining a conventional cutting method. : Workpiece Oa, lOb: Cutting surface Oc: Inclined surface 00: V-shaped blade 00a, 100b: V-shaped blade part Figure 3 Figure 3 Figure 4 Figure 6 Figure 7 Procedure manual ( Voluntary) June 19, 1990 "Drawings" The previously submitted amendments are made as follows. “Figure 2” is attached here.

Claims (1)

[Claims] 1) At the top of the cut surface formed by cutting,
A brittle method characterized in that a sloped surface is formed in advance by a shaped blade, and then a part of the sloped blade part of the V-shaped blade is adapted to the sloped surface to cut along the cutting surface. Material cutting method.