JPS61182748A - Polishing method for thin strip - Google Patents

Abstract

PURPOSE:To improve accuracy of thickness, yield rate and polishing efficiency, by spirally winding a metallic thin strip of amorphous material or the like on the peripheral surface of a cylindrical shaped roll to be polished by a rotary wheel. CONSTITUTION:An amorphous material 1 fixes its both end parts to the peripheral surface of a work winding shaft 2 so that winding force of the material may continually act through stop screws 3, 3' while a width end of the material may be brought into contact in a closely tight condition. And the work winding shaft 2, being rotated in a direction of rotation of an arrow head 8 in the drawing, that is, the winding direction of the amorphous material 1, prevents it from loosening. And the material 1 is polished by adapting a polishing wheel 10, while it is placed in a rotating condition, to the material 1 with a predetermined pressing load while laterally moving the whole shaft of the polishing wheel in the direction of an arrow head 17 in the drawing. In this way, the polishing method, in which the thickness of an adhesive layer as in the past can be almost neglected because the material 1 is mechanically wound on the work winding shaft 2, enables dimensional accuracy of thickness, yield rate and polishing efficiency to be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for polishing a ribbon used as a magnetic core material for a magnetic head, and particularly to a method for manufacturing an amorphous alloy ribbon (hereinafter referred to as amorphous material).

BACKGROUND OF THE INVENTION In recent years, amorphous materials have been widely used as magnetic core materials for magnetic heads, taking advantage of the high magnetic flux density they possess. The usage of amorphous material as a magnetic head is as follows.
It is used after being polished to a thickness that corresponds to the magnetic track width. For example, when used as a DAT (digital audio tape recorder) head, the track width is around 18 μm, and amorphous material is also 18 μm.
Must be polished to m±/μ.

Below, a conventional amorphous polishing method will be explained based on the drawings. As shown in Figure 2, the amorphous material 1 generally has a width 22 of 10H to 60ff.
, thickness 23 is 40μ111 to 1oOμm, length 24 is several meters, and is supplied by a commercial manufacturer.

As shown in Figures 2 and C, when manufacturing a magnetic head using an amorphous material, a small piece of amorphous material 2 cut into an optimal shape (usually 10 girth angle) is used.
6 is obtained, and is precisely adhered to a pasting surface plate 26 made of metal or ceramic material υ using an adhesive 27. However, no matter how precisely the bonding is performed, the adhesive layer has a thickness 28, and when regulating the thickness of the amorphous small piece 25, the adhesive layer thickness 28 must be taken into consideration. Thereafter, the machined surface 30 of the amorphous piece 25 is lapped using free abrasive grains using a commonly used single-sided lapping device or the like, and the thickness 29 of the amorphous piece 25 is controlled to complete the process on one side. For the surface opposite to the processed surface 3o of the amorphous small piece 25, the above-described process is repeated again to finish processing both sides of the amorphous small piece 25.

The thickness of the amorphous piece 26 obtained through the steps 4 to C in FIG. 2 described above is equal to the adhesive layer thickness 2 in the bonding operation.
8 causes variations in the thickness of the amorphous pieces 25. For example, in the case of a DAT head, it is 18μm±
Controlling it to 1 is extremely difficult and results in a significant decrease in yield.

Furthermore, there is another major problem in that the adhesive may be dissolved by lapping oil, solvent, etc. during processing, and the amorphous pieces 26 may be dislodged. As for the above-mentioned problem, if the size of the amorphous small piece 26 is reduced, the processing accuracy (thickness dimension) will be improved, but on the other hand, the possibility of it coming off from the attachment surface plate 26 becomes even stronger. As is clear from the conventional examples, the invention has two advantages: (1) improvement in thickness accuracy yield, and (2) improvement in processing yield by preventing peeling during processing.
) This is an attempt to solve the problems in the conventional example by improving processing efficiency.

Means to Solve the Problems In the present invention, a thin metal strip of amorphous material or the like is wound in a seven-spiral shape around the outer peripheral surface of a cylindrical roll.
Using means for mechanically fixing both ends of the amorphous material, the rotating direction of the roll is the same as the spirally wound direction, and a rotating grindstone is brought into contact with the spirally wound amorphous material. Perform processing.

Function: In the present invention, it is possible to polish a metal ribbon as it is as an amorphous material as shown in FIG. This is a processing method that can almost ignore the adhesive layer thickness of the conventional example, and improves the accuracy of the thickness dimension, the processing yield, and the processing efficiency.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1a and 1b. A shows a front view of the main part for explaining the polishing method, and b shows the main part of the person in the direction of arrow A-person' in a. A plan view is shown.

Amorphous material 1 (width 1 in this example) which is the workpiece
0jff, thickness 60 μm) on the outer circumferential surface of the workpiece winding shaft 2, a winding force is always applied to both ends of the delambda fastener material 1 via the setscrews 3, 3'. It has such a structure (not shown) that it is fixed to the workpiece winding shaft 2 so that its width ends are in close contact with each other. The outer peripheral surface of the workpiece winding shaft 2 is mirror-finished, and the roll surface side of the amorphous material 1 (in the manufacture of amorphous materials, one side is rolled and the both sides are rolled) is wrapped around the workpiece. Wrap it around the wheel 2 and reduce the gap as much as possible when wrapping. In this example, SK material was used as the material for the workpiece winding shaft 2, but the larger the thermal expansion coefficient of the workpiece winding shaft 2 is than that of the amorphous material 1, the more the elongation of the amorphous material during processing can be absorbed. . The workpiece winding shaft 2 is rotated in the direction of arrow 8 by a drive motor 4 via a belt 6 and a pulley 6.7. The rotational direction of the arrow 8 is the same as the direction in which the amorphous material 1 is wound around the workpiece winding shaft 2 to prevent the amorphous material 1 from loosening during processing. The rotating shaft of the workpiece winding shaft 2 is supported by both centers 9 and 9', allowing highly accurate rotation.

On the other hand, a soft grindstone is used as the material for the polishing wheel 10 so as not to impart polishing distortion to the amorphous material 1 that is the workpiece. The polishing whetstone is rotated in the direction of arrow 16 by a drive motor 11 rotating a whetstone shaft 16 via a belt 12 and pulleys 13 and 14. The polishing wheel 10 is rotated and abuts against the amorphous material 1 with a predetermined suppressing load, and the entire polishing wheel shaft is moved in the direction of the arrow 17 by a predetermined horizontal movement within a range where the entire wound amorphous material 1 can be polished. (not shown). In actual polishing work, the workpiece winding shaft 2 is processed using the same polishing device, and then the amorphous material 1 is wound thereon to perform precise polishing. Furthermore, during machining, it is necessary to jet cooling water with extremely low impurities to the machining pole to cool the amorphous material 1 and the workpiece winding shaft 2 and to discharge chips. Typical polishing conditions used in this example include a workpiece winding shaft rotation speed of 150 RPM.

Grinding wheel rotation speed 15ORPM, left and right feed speed 300MM/
As a result of polishing with a grindstone grain size of #3000 and a grindstone load of 10Kyf, a desired thickness of 18 μm could be obtained. Furthermore, it was confirmed that the amorphous material could be polished without coming off even during processing.

In the above embodiment, an example was described in which the grinding wheel shaft was moved back and forth in the longitudinal direction of the workpiece winding shaft around the workpiece winding shaft on which amorphous RA-A was spirally wound. It goes without saying that the grinding wheel may be configured to rotate at a fixed position while the workpiece winding shaft is rotated and reciprocated in the longitudinal direction of the shaft center.

Further, the part to be polished is not limited to a metal member such as an amorphous ribbon, but any thin ribbon such as a resin member may be used.

Effects of the Invention As described above, according to the polishing method of the present invention, it is possible to polish an amorphous material in a band shape, and since no adhesive is used, accuracy can be improved, and manufacturing yield and processing can be improved. It becomes possible to improve efficiency.

[Brief explanation of the drawing]

Figures 1a and 1 are front views and plan views of essential parts for explaining the polishing method of the present invention, Figure 2a is a perspective view of the amorphous material, and Figure 2 is a conventional polishing method. FIG. 2C is a front view of the main part for explaining the method, and FIG. 2C is a front view of FIG. 1... Amorphous material, 2... Work winding shaft, 3.3'... Set screw, 4.11...
... Drive motor, 5.12 ... Belt +
6, 7, 13, 14...Pulley, 8,
16.17...Moving direction, 9,9'-...
・Support shaft, 10... Polishing whetstone, 16... Grinding wheel shaft, 26... Amorphous small piece, 26...
...Pasting surface plate, 2A...Adhesive. Name of agent: Patent attorney Toshio Nakao and 1 other person1°
--Amorphous Zoreigei O-・-Shin, mail es,, 1 f5- layer h axis

Claims (3)

[Claims] (1) A state in which a polishing whetstone rotating shaft is arranged perpendicular to a workpiece winding shaft formed by winding a thin ribbon in a spiral shape on the outer peripheral surface, and the workpiece winding shaft and the polishing whetstone are rotated to a predetermined value. A method for polishing a ribbon, characterized in that the polishing wheel is brought into contact with the polishing wheel, and either one of the polishing wheel rotating shaft or the workpiece winding shaft is moved relatively. (2) The relationship between the thermal expansion coefficients of the workpiece-wrapping shaft material and the material to be polished is such that the workpiece-wrapping shaft material is made larger and the material to be polished is smaller. How to polish thin strips. (3) A method for polishing a ribbon according to claim 1, characterized in that the ribbon is an amorphous alloy ribbon.