JPS63200307A - Manufacture of back bar - Google Patents

Abstract

PURPOSE:To facilitate the working of a very small parts and to improve production efficiency, by grinding the bottom plane of a block having a size between grooves equal to the width of a product and hight a little higher than the height of the product. CONSTITUTION:By bonding the aperture side plane of the block 5 in which a nonmagnetic layer 12 is interposed between magnetic materials 11 and 11' and the width between the grooves 25, 25 is fitted to the width (b) of the product, and the height (h') a little higher than the height of the product is given, on a jig, grinding an opposite side, and finishing the height to the height (h), it is separated as a back bar 4. In such a way, it is possible to facilitate the working of the small parts, and to improve working efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. The present invention relates to the manufacture of small precision parts such as magnetic heads, and in particular to the production of small precision parts such as back bars of magnetic heads for floppy fist disk drives (FDD), which are small and have precise surfaces. Concerning methods of manufacturing parts that require finishing.

The back bar, which is a part of the magnetic head for FDD and connects the leg ends of the head core, is made of the same material as the core, and is made of a magnetic material such as ferrite (11, 11), as shown in Figure 3. '
) with a non-magnetic layer (12
) is interposed between the joint surfaces (10
) is precisely polished and finished. Also, its size is approximately l XQ, 5 in width (b), height h), and length 1).
X 5 (1 m) and the thickness of the nonmagnetic layer (12) is approximately 0.1 Iul.

The conventional manufacturing process first involves manufacturing a magnetic material 2 as shown in Figure 2(a).
A non-magnetic layer (22) is arranged between 1.21' and a thickness corresponding to the length l of the back bar. ) along the lines shown in Figure 2 (b) using a wire saw, slicer, etc.
) to form a block (2) with a thickness of (h'). However, h') is the height of the back bar.
50 to 100 μm) with a finishing layer added. This is further cut along the broken line (31° 31 . . . ) to obtain the block (31). The dimension (b) at this time corresponds to the width (b) of the back bar. This block (3) is attached to a polishing jig (not shown) and the upper surface (13) is polished to a height h), and the surface is finished to obtain a back bar (4) (FIG. 3).

11f’　　　　-”　　　.

In order to reduce loss when joining the back bar to the core, the joining surface must be precisely finished. However, the above-mentioned conventional method has the disadvantage that the small final part must be attached to the polishing jig, which makes the work very complicated.

, , In order to eliminate this complexity, the surface opposite to the surface to be finished with precision has a parallel part that is higher than the height at the end of polishing, and the distance between the grooves is the final height. Grooves corresponding to the width of the part to be obtained are formed at equal intervals, the groove opening surface is attached to a polishing jig, and the parts are separated by grinding, without being removed from the jig. A method is used to precisely finish the surface.

An example of the method for manufacturing a back bar according to the present invention is shown below. (Figures 1 and 2) A component material (1) is made in the same manner as the conventional method and cut along the broken line 30, 30... to obtain a block (2), whose height is h. "year,
Slightly larger than the conventional method.

(The reason will be explained later) This block (2) has grooves (25, 2
5...) is formed. In this case, it is necessary to make the part between the grooves (b) equal to the width of the back bar (b), and to make the length of the parallel part (d) of the groove side surface equal to the height of the back bar (h). The goal is to make the groove bottom thicker (about 0.2 to 0.5 m thick) so that it can withstand subsequent handling. Therefore, the height of block (2) h
'') needs to be slightly larger than the block height h'' in the conventional method.

Next, as shown in FIG. 1(b), this grooved block (5) is attached to a polishing jig (not shown) on the side where the grooves are opened, and the opposite side is ground. Then the groove (25, 25...
) into individual back bars (4°4,...). This is further polished to form a joint surface (polished surface).
By precisely finishing (10), the back bar (4) shown in FIG. 3 is obtained.

As explained above, by applying the manufacturing method of the present invention, it is no longer necessary to handle small parts, and
Since many parts can be processed simultaneously, work efficiency is greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a back bar component material to explain the present invention in detail, Fig. 2 is a perspective view of a part material to explain the back bar manufacturing process by a conventional method, and Fig. 3 is a schematic diagram of the back bar. FIG. 4...Back bar, 5...Block, 10...
・Joining diagram (polished surface), 25...groove. Patent applicant Kansai NEC Corporation (b) (C) Fig. 1 Bat%-Misaki product charge loquat diagram]O

Claims (1)

[Claims] In the manufacturing process of back bars, etc. that connect the leg ends of the core of a magnetic head, when obtaining the final shape, parallel straight sections are created that are shallower than the thickness of the back bar component material and longer than the height of each component. Manufacturing a back bar characterized by forming grooves at equal intervals so that the gap between the grooves corresponds to the width of the final part, attaching the groove opening surface to a jig and grinding the opposite surface. Method.