JPS6186168A - Chamfering method - Google Patents

Abstract

PURPOSE:To chamfer an edge in an article to a condition forming roundness, by placing the workpiece article so as to bring its edge part into contact with a flexible lapping tape loaded on an elastic base material and pressing the workpiece article to be slided onto the lapping tape. CONSTITUTION:A side rail 10, 11 of a slider 4 is loaded on a lapping tape 15, 15 glued onto an elastic base material 14, 14. The slider 4, if it is pressed to the tape 15, 15, strongly presses to the tape 15, 15 only the portion of edges (e) surrounding a surface of the side rail 10, 11 opposed to the tape 15, while the slider 4,if it is slided on the tape 15, wears only the edge (e) to be chamfered by forming roundness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a chamfering method that is effective in manufacturing a magnetic head for a magnetic disk device used as an external storage device in an information processing system.

[Prior art and its problems]

Figure 4 shows a magnetic head that is chamfered.
(a) is a side view of the device in use, and (b) is a perspective view of the device as seen from the front gap side. The front gap 1 faces the magnetic coating film 3 of the magnetic disk 2. In this magnetic head, a slider 4 and a core 5, which control the flying of the magnetic head, are made of the same ferrite, and the core 5 is fixed to the slider 4 through glass at a front gap 1 and a bank gap 6. 13 is a coil for reading and writing, and core 5
is wrapped around. The front gap 1 is formed between a convex center rail 7 and the core 5, and on both sides of the center rail 7, side rails 10.11 are also convex with grooves 81.82 in between. It is provided.

At the end of each rail 7.10.11 there is an angle of attack slope 7", 10" for aerodynamically levitating the magnetic head.
°, 11゛ is formed. The slider 4 is supported by a gimbal 12 via a back groove 9, and is pressed toward the disk 2 by spring pressure. When the disk 2 rotates in the direction of the arrow, the slider floats several μm due to the air flow between the slider 4 and the disk 2, and the front gap 1 faces the magnetic coating 3 via the air gap. In this state, the coil 13 reads and writes information.

In this way, in a magnetic disk device, as shown in Fig. 4 (a),
As shown in the figure, the magnetic throat reads and writes information while floating only a minute gap from the magnetic disk, which is the recording medium, due to the wind force generated during the high speed rotation of the magnetic disk, but minute foreign objects may interfere with the magnetic head and the recording medium. Even if the slider gets stuck between the slider and the slider, there is a risk of a head crash occurring from a weak part of the slider. Especially CS S (Co
This method is called the tact 5 tart Stop) method, and because sufficient buoyancy cannot be obtained when the recording medium starts and stops rotating, in the method in which the magnetic head contacts the recording medium, the recording medium rotates and slides relative to the magnetic head. Because you will have to
Head crashes are also likely to occur due to impact between the magnetic head and the recording medium at that time.

There are certain locations where head crashes are likely to occur, such as the site rail 10 that faces the recording medium of the magnetic head.
．． No. 11, the 90-degree edge around the surface facing the recording medium is most likely to be damaged or cracked. Therefore, this edge is chamfered to create a 45 degree slope as shown in the figure. However, even with this chamfering, a 135 degree edge e remains around the surface of the sight rail 10, 11 facing the recording medium, so chips and cracks are likely to occur.

By polishing and rounding this edge e and chamfering it into a curved surface, chipping and cranking can be prevented by eliminating the edge, but it is difficult to easily chamfer all the edges into a curved surface.

[Technical problem of the present invention]

A technical object of the present invention is to solve such problems in the conventional chamfering method and to make it possible to easily chamfer the edges of articles such as magnetic heads into a rounded state.

[Technical means of invention]

The technical means of the present invention taken to solve this technical problem is a method of chamfering the edges of an article to form a curved surface. A method is adopted in which a wrapping tape is placed, a processed article is placed on top of the wrapping tape so that its edges are in contact with the wrapping tape, and the processed article is slid against the wrapping tape while being pressed against the wrapping tape. ing.

[Effect of technical means]

- According to this technical means, since the base material is made of an elastic material, the site rail of the magnetic head is directed toward the wrapping tape on the highly flexible wrapping tape placed on the base material. When it is placed and the magnetic head is slid, the edges around the sight rail dig into the base material through the wrapping tape.

Therefore, the most protruding edge part hits the wrapping tape most strongly, and the other flat surfaces are separated from the wrapping tape, so by sliding the magnetic head, only the edge part is polished and chamfered into a curved surface. .

Moreover, the edges of the outer periphery of the sight rail that are in contact with the wrapping tape all bite into the wrapping tape at the same time, so they are all chamfered at the same time by sliding the magnetic head, so each edge can be chamfered independently. There is no need for chamfering, and chamfering can be done in one step.

[Embodiments of the invention]

Next, examples will explain how the chamfering method according to the present invention is actually implemented. FIG. 1(A) is a side view of an example in which the chamfering method according to the present invention is applied to manufacturing a magnetic head. 14.14 is a base material made of an elastic material,
Wrapping tape 15.15 is pasted onto it. In the illustrated example in which the sight rails 10 and 11 of the slider 4 are placed on the wrapping tape 15.15, the base material 14 is separated by the sight rails 10 and 11, but they are integrated. It's okay. However, the lashing chive 15 is separate from the sight rail 10 and 11. Slider 4 on wrapping tape 15.15
A plan view of the state with removed is as shown in Figure (B). That is, the wrapping tape 15.15 extends in the longitudinal direction of the sight rail 10.11=□The wrapping tape 15 affixed to the base material 14.14 in this way
．． 15, wrap slider 4 with wrapping tape 15.1
5, move and slide in the longitudinal direction of the sight rail 10.11. An enlarged view of the contact portion between the sight rail 10.11 and the wrapping tape 15.15 at this time is shown in FIG. That is, only the edge e surrounding the surface of the sight rail 10.11 facing the wrapping tape 15 is covered with the wrapping tape 15.
15 is pressed hard. Therefore, when the slider 4 is slid on the wrapping tape 15, only the edge e is worn, becomes rounded, and is chamfered.

FIG. 2 is a plan view showing the chamfered state in this manner. The hatched area is the area chamfered by the wrapping tape 15, and all edges are shown to be rounded.

FIG. 3 shows a chamfering device that can perform such chamfering more efficiently, in which (a) is a plan view with the guide removed, and (b) is a plan view of the guide. A single rubber seam 4 is placed as an elastic base material on a rigid base 16, on which a plurality of wrapping chives 15 are arranged parallel to each other at intervals,
It is attached to a rubber sheet 14. Also base 16
Positioning bins 17 are installed at regular intervals in the row direction of the wrapping tapes 15.

(b) The guide 18 shown in the figure is a rectangular plate with a slit 19 of a constant width formed therein, and a positioning hole 20 into which the bottle 17 is inserted at both ends. ing. (b) As shown by the chain line in the figure, the guide 18
is placed on the base 16 and the guide bin 17 is inserted into the positioning hole 20, so that the slit 19 is located directly above the gap between adjacent wrapping tapes 15. The width W of the slots 9 of the guide 18 is slightly larger than the width W of the slider 4. By inserting the slider 4 into the slit 19 and moving it in the longitudinal direction of the slit 19, the width of the slider 4 can be increased. Press the sight rail 10.11 against the wrapping tape 15.15 on the underside of the guide 18,
make it slide.

At this time, as shown in the figure (B), the slit 19 is formed long, and a plurality of sliders 4 are stored in the slit in advance, and the sliders 4 are taken out one by one and slid in the direction of the arrow a1. , efficient. The movement of slider 4 is as follows:
It is made to reciprocate only once or once or several times in the direction of arrow a1.

(c) If the jig 24 is used as shown in the figure, the slider 4
can be pressed against the wrapping tape 15 with a constant pressure and can slide easily. This jig 24 has a U-shape that straddles the upper side of the guide 18, and the guide 18 is attached to both ends of the jig 24.
A presser rod 23 is inserted into a support hole 22 in the vertical direction 1u, which has an L-shaped recess 21.21 guided by both edges of the slit 19 and is opened at a position directly above the slit 19. The lower end of this presser bar 23 is pointed in a conical shape, and its tip is
The gimbal attachment on the back of the slider 4 in the slit 19 fits into the recess 9.

Since the slider 4 is pressed against the wrapping tape 15 due to the weight of the presser foot 23, the jig 24 is
When the slider 4 is moved in the direction of the arrow a1 along both edges of the presser bar 23, the inner wall of the recess 1M 24 on the back of the slider 4 is pushed in the direction of the arrow a1 by the lower end of the presser bar 23, and the slider 4 is moved along the slit 19. . Wrapping tape 15 for slider 4
If the pressing force is insufficient, the presser bar 23 can be pressed against the slider 4 using springs.

When the polishing ability of the wrapping tape 15 decreases, the guide 18 is removed from the base 16, replaced with the next bin 20, and chamfering is performed in the same manner. In the illustrated example, each half of the wrapping tape 15 can be used twice.

Note that if the wrapping chives 15 and 15 are integrated and the center rail 7 is also brought into contact with the wrapping tape 15, the outer periphery of the center rail will also be chamfered roundly.

In the illustrated example, a read/write magnetic head used in a magnetic disk device is processed as an article to be chamfered, but any article that needs to be chamfered and rounded is limited to magnetic heads. It's not something you can do.

〔Effect of the invention〕

As described above, according to the present invention, the highly flexible wrapping tape 15 is placed on the base material of an elastic material such as the rubber sheet 14, and the workpiece is moved thereon. The sharp parts of the object are strongly pressed against the wrapping chive 15 and chamfered intensively, resulting in a rounded shape.

Moreover, since all the sharp parts on the wrapping tape 15 side are pressed against the wrapping tape 15 at once, all edges are chamfered at the same time, making it efficient. Moreover, since all you have to do is move the slider 4, the work is easy. It is.

[Brief explanation of the drawing]

FIG. 1 is a side view, plan view, and enlarged side view of essential parts showing an embodiment of the chamfering method according to the present invention, FIG. 2 is a plan view of a magnetic head chamfered by the method of the present invention, and FIG. 3 is a diagram according to the present invention. FIG. 4 is a plan view and a partially cutaway perspective view of an apparatus for carrying out the method, and FIG. 4 is a side view and a perspective view of a magnetic head in use, which requires chamfering, as viewed from the front gap side. In the figure, 4t is a slider, 7 is a center rail, and 1 is a slider.
0.11 is the sight rail, 14 is the base material made of elastic material (
15 is a wrapping tape, 18 is a guide, 19 is a slit, and 24 is a jig.

Claims (1)

[Claims] A method of chamfering the edges of an article to form a curved surface, in which a flexible wrapping tape is placed on a base material made of an elastic material, and the processed article is placed on top of the flexible wrapping tape, so that the edges of the article are wrapped. A chamfering method characterized by placing the workpiece in contact with the tape and sliding the workpiece against the wrapping tape while being pressed against the wrapping tape.