JPH0322274Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention provides a method for processing a disc-shaped workpiece having a circular opening in the center by forming an inner diameter surface regulating the circular opening and chamfered areas formed on both sides thereof. The present invention relates to a jig for electrolytically treating an aluminum or aluminum alloy magnetic disk substrate of the shape for a computer auxiliary storage device.

Prior art and its problems Magnetic disk substrates made of aluminum or aluminum alloy undergo electrolytic treatment,
For example, anodic oxidation treatment is performed. In this anodizing treatment, it is required that the inner diameter surface regulating the circular opening formed in the center of the substrate is not treated.
Generally, as shown in FIG. 1, chamfers are applied to both sides of the inner diameter surface 3 that regulates the circular opening 2 of the disk substrate 1, and in reality, anodizing treatment is not performed on both sides of the chamfered area 4. desired.

As a jig for performing anodizing treatment excluding the inner diameter surface 3 that regulates the circular opening 2 and the chamfered area portion 4, a structure described in Japanese Utility Model Application No. 60-78877, or a structure described in Japanese Utility Model Application No. 60-78877, or A jig with the structure described in Publication No. 36425 was proposed. However, in the former jig, masking is performed on the substrate surface, and in the polishing process that is performed after anodizing treatment, the anodized surface and the aluminum surface due to masking coexist on the substrate surface, resulting in flat surface polishing. A problem has arisen that makes it difficult to In addition, this jig requires complicated preparation work for anodizing treatment, has a large number of parts, and has the problem of troublesome maintenance. On the other hand, the jig described in the latter publication has a structure in which a masking ring made of an elastic material is inserted into a circular opening, compressed from both sides, and elastically deformed to mask the inner diameter surface.
This structure has the problem that the masking area is determined by deformation of the masking ring, and that an oxide film is often formed partially within the area that must be masked. Furthermore, in this jig, the conductor that provides electrical continuity to the material to be treated is exposed to the treatment solution during anodizing treatment, so it must be replaced every time the treatment is performed, which is a cumbersome task. Moreover, the electrical contact between the conductor and the material to be treated is not necessarily sufficient.
There were also problems such as conduction errors occurring, or even if conduction was ensured, masking in the vicinity became defective.

Purpose of the invention The purpose of the present invention is to solve the problems of the prior art described above, to have a simple structure, good workability, and to ensure masking of the inner diameter surface regulating the central circular opening and both sides thereof. It is an object of the present invention to provide a jig for anodizing a magnetic disk substrate, which has a structure that ensures electrical conduction means from the outside to a material to be treated and does not require replacement for each treatment.

Means for Solving Problems In order to achieve the above object, the present invention includes a pair of divided main body members that are attached to sandwich the material to be treated from both sides of a circular opening of the material to be treated and are tightened together; an O-ring-shaped masking member made of an elastic material, which is arranged on each of the main body members and is pressed against the chamfered area when both main body members are attached to the material to be treated; , a conductor divided into a plurality of pieces in the circumferential direction, disposed on one side of the main body member and fitted into the circular opening of the material to be processed by attaching the main body member to the material to be processed; , an elastic body disposed on the inner circumferential side of the conductor and compressed and elastically deformed by tightening both the main body members, thereby pressing the conductor in a radially expanding direction; a lead wire for electrical processing, one end of which is electrically connected to one or more of the electrical conductors, and which extends to the outside of the one main body member through a sealing member. Thus, a jig for anodizing magnetic disk substrates was constructed.

Function: In the jig for anodizing magnetic disk substrates according to the present invention, O-ring-shaped masking members provided on each of the main body members attached to both sides of the material to be processed are used to form a circular opening in the material to be processed. is pressed against the chamfered area portions on both sides of the main body member, thereby sealingly isolates the space surrounded by both main body members, the masking member, the chamfered area portions, and the inner diameter surface from the outside. A conductor is placed in this isolated space,
An elastic body is placed on the inner circumferential side.
That is, they are not exposed to the processing solution. The conductor is divided in the circumferential direction and can be deformed to expand its diameter, and when both main body members are attached and tightened together, the diameter of the conductor is expanded by the elastic body that deforms in the direction of expansion. . This enlargement of the diameter of the conductor ensures contact between the conductor and the material to be treated, ensuring electrical continuity. In addition, the lead wire that provides electrical continuity to the conductor from the outside has one end connected to the conductor and the other end inserted through the main body member in a sealed state and pulled out, so that both main body members and masking as described above are possible. Parts, chamfered area,
And the isolation of the space surrounded by the inner diameter surface can be ensured.

Description of the Embodiment The jig of the embodiment shown in FIG. 2 has two main body members 10a and 10b each having a cylindrical outer shape. These main body members 10a, 10b are attached to both sides of a magnetic disk substrate M, which is a material to be processed. This installation is done by screwing the screw member 13 from the outside of the other main body member 10b into the female screw hole 12 of the boss 11 formed at the center of the inside of one main body member 10a (the side facing the main body member 10b). This is now being done by tightening the rules. A packing 14 is interposed between the screw member 13 and the main body member 10b to prevent the processing liquid from entering the isolated space inside the main body member through the insertion hole 15 of the screw member 13. The O-ring indicated by the reference numeral 16 is provided as a seal to prevent the screw member 13 from falling off, and can be omitted.

Both main body members 10a and 10b have an outer diameter somewhat larger than the central opening 18 of the material M to be treated.
Inner diameter surface 19 regulating the central opening 18 of the material to be treated M
Chamfered area portions 20 are formed on both sides of the main body members 10a and 10b, respectively, and O-ring-shaped masking members 21 made of an elastic material are provided in correspondence with these chamfered area portions 20, respectively. ing.

A conductor 22 made of a conductive material is arranged in the space around the boss 11 . This conductor 22 has a split ring structure that is divided (for example, into 2 to 5 parts) in the circumferential direction. The outer diameter of the outermost diameter portion 22a of the conductor 22 is slightly smaller than the inner diameter of the inner diameter surface 19 that regulates the circular opening 18 of the material M to be processed, and the circular opening 18 of the material M to be processed can be easily closed, although tightly. It is designed to fit inside. or,
As shown in FIG. 2, the shape of the outermost diameter portion 22a is such that the outer diameter surface 2 corresponds to the inner diameter surface 19 regulating the circular opening 18 and the chamfered area portions 20 on both sides thereof.
2a', a chamfered area portion 22a'', and a thickness dimension.

The conductor 22 has a notch 22b formed on the inner peripheral surface side, and an elastic body 2 made of an elastic material is placed inside the notch 22b.
3 are deployed.

The shapes and dimensions of these masking member 21, conductor 22, and elastic body 23 are set as follows. That is, when both main body members 10a and 10b are tightened in a predetermined state by the screw member 13, the outermost diameter portion 2 of the conductor 22 as shown in FIG.
2a is completely accommodated in the circular opening 18 of the material to be treated M, and in this state, the conductor 22 is pressed in the direction of diameter expansion due to compressive deformation of the elastic body 23, and the outermost diameter portion 2
The outer diameter surface 22a' of 2a is in close contact with the inner diameter surface 19 regulating the circular opening 18, and the masking member 21 is compressed and deformed between the inner surface 24 of both main body members and both chamfered area portions 22a''. This is how it works.

One end of a lead wire 25 is connected to the conductor 22 . This lead wire 25 is guided to the outside through the main body member 10a, and the inserted portion of the main body member 10a is sealed in a fluid-tight state by a suitable sealing material 26.

The operation of the jig having such a structure will be explained. As will be clear from the above, when mounting the workpiece M, the main body members 10a and 10b are brought into contact with the circular central opening 18 from both sides thereof. At this time, since the elastic body 23 is not yet compressed and the conductor 22 can be easily reduced in diameter, its outermost diameter portion 22a can be easily inserted into the circular opening 18, although in a relatively tight state. Can be fitted. Thereafter, the screw member 13 is screwed into the female screw hole 12 to tighten the main body members together. The installation is now complete.

By tightening the screw member 13, first, the elastic body 23 is compressed and deformed and presses the conductor 22 in the direction of diameter expansion.
The outer diameter surface 22a' is brought into tight contact with the inner diameter surface 19 of the circular opening 18. This ensures electrical contact between the conductor 22 and the material M to be treated. At the same time, the outermost diameter portion 22a of the conductor 22 is pressed to the center by both main body members via the masking member 21, and is held in a position lined up on the same surface as the material to be treated M. is pressed against the chamfered area 20 of the circular opening 18 of the workpiece M, as shown in FIG. Due to this pressure contact, the chamfered area portion 20 is completely masked,
Further, the space inward from this is isolated from the outside of the main body member. Therefore, although not directly masked, the inner diameter surface 19 is not exposed to the processing liquid and is not processed.

After being used for a desired process, the main body members 10a and 10b can be removed and used again for the next process. This is because, unless the masking member 21 is deteriorated or damaged and needs to be replaced, the conductor 22 for establishing electrical continuity with the material M to be treated is
This is because the processing liquid is not exposed to the processing liquid and the processing liquid is prevented from flowing into the internal space between the two main body members, so there is no problem in reusing it.

4 to 7 show other embodiments.

As shown in FIGS. 4 and 5 as a main body member 30, the shape of the main body member is not limited to the shape shown in FIG. 2 and can be changed in various ways. For example, as shown here, back surfaces 31a and 32a of conductors 31 and 32
can be made into an inclined surface to facilitate diameter expansion operation. Further, as shown as the elastic body 33, the elastic body can have a circular cross section in addition to the rectangular cross section (FIG. 2), or can have a shape other than this. Similarly, any shape such as an R-shaped notch groove 34 or a rectangular groove 35 can be used as the notch portion for receiving the elastic body 33.

Further, as shown in FIGS. 6 and 7, the shape of the main body member shown as the other main body member 40 is also arbitrary. For example, instead of directly pressing the conductor (not shown) against the wall surface of the main body member, a shape may be adopted in which pressing spacers 41 and 42 are interposed. This spacer 42 has a shape in which only the portion that comes into contact with an elastic body (not shown) protrudes.

In any case, the shape can be made to improve handling when assembling the jig or attaching it to the material to be treated.

Incidentally, the jig according to the present invention can be similarly used for processing members other than the magnetic disk described herein in which it is desired to prevent the processing of circular openings.

Effects The jig according to the present invention has extremely good workability for attaching and detaching the workpiece to and from the workpiece, and can perform the work in about half the time compared to the jig having the conventional structure described above. In addition, it not only has good workability, but also ensures electrical continuity with the material to be treated easily and reliably.
Product yield has improved. Moreover, since troublesome work such as film removal treatment every time the conductor is used is no longer necessary, the work process has also been simplified.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged sectional view showing a chamfer formed on the inner diameter surface of a general magnetic disk. FIG. 2 is an exploded overall sectional view showing the assembly positional relationship between an electrolytic treatment jig and a magnetic disk substrate according to an embodiment of the present invention. FIG. 3 is a partially enlarged sectional view showing a sealed state when a magnetic disk substrate is fixed by the electrolytic treatment jig of the embodiment shown in FIG. 2. 4 to 7 are partial sectional views showing the main body member of an electrolytic treatment jig according to another embodiment of the present invention. M... Material to be processed, 1... Disk substrate, 2, 1
8... Circular opening, i.e., central opening, 3, 19... Inner diameter surface, 4, 20... Chamfered area portion, 10a, 10
b... Body member, 12... Female threaded hole, 13... Threaded member, 14... Packing, 15... Threaded member insertion hole, 21... Masking member, 22... Conductor, 23... Elastic body, 25...Lead wire, 26
...Sealing material, 30...Body member, 31, 32...
...Conductor, 33...Elastic body, 34, 35...Groove,
40...Body member, 41, 42...Spacer.

Claims (1)

[Claims for Utility Model Registration] Electrolytic treatment of a disk-shaped aluminum or aluminum alloy treated material having a circular opening in the center, excluding the inner diameter surface that regulates the circular opening and the chamfered areas on both sides thereof. A jig for processing the material, comprising: a pair of divided main body members that are tightened together and are attached to sandwich the material to be processed from both sides of the circular opening of the material to be processed; and each of the main body members. an O-ring-shaped masking member made of an elastic material, which is arranged in an O-ring-shaped masking member made of an elastic material and is pressed against the chamfered area portion by attaching both main body members to the treated material from both sides; a conductor divided in the circumferential direction, disposed on one side of the main body member and fitted into the circular opening of the material to be processed by attaching the main body member to the material to be processed; is arranged on the inner circumferential side of the main body, and is compressed and elastically deformed by tightening both of the main body members,
an elastic body configured to press the conductor in a radially expanding direction; one end electrically connected to the conductor;
A jig for electrolytic processing of a magnetic disk substrate, comprising: a lead wire for electrical processing extending to the outside of the one main body member via a sealing member.