JPS6233019Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the invention of an electrolytic treatment jig for aluminum alloy magnetic disk substrates, which can accurately grip the aluminum alloy disk substrate, which is a donut-shaped disk, and prevent the occurrence of defects. The object of the present invention is to provide a jig that can be used to handle the disc substrate, perform appropriate anodic oxidation treatment, and finish the peripheral side of the central opening of the disk substrate into a non-coated portion that is convenient for subsequent sputtering and the like.

When using an aluminum alloy magnetic disk for a computer using the sputtering method, it is necessary to form an alumite layer on the ground disk substrate surface by an anodizing method before the step of forming the magnetic layer. However, the anodic oxidation method for aluminum products usually involves the steps of racking the workpiece, pretreatment, electrolysis, cleaning, and unracking, and the success or failure of racking has a large effect on product quality and productivity. By the way, the conditions required for racking and unracking in the anodic oxidation method include that the electrolytic power is reliably conducted to the workpiece, that the workpiece is not damaged, and that workability is good. It is necessary to securely tighten the workpiece and the racking jig so that the clamps do not loosen or come off, or even fall off.In the electrolytic bath, a relatively strong flow is formed due to forced circulation of the electrolyte. It is normal for workpieces to be exposed to quite strong forces, including during handling between processes, and it is necessary to ensure that they can withstand these strong forces. If the tightening force is increased to withstand the force, it is likely that the workpiece will be easily damaged, or scratches on the workpiece should be definitively excluded. Moreover, as mentioned above, ensuring that the workpiece can withstand strong forces and not causing damage to the workpiece often requires careful handling and a certain level of skill, which tends to lead to a decrease in productivity. As mentioned above, it is required to have excellent properties. If we look at the actual racking method used in alumite factories, we find that, for example, in the case of aluminum household goods, a jig in which the end of a bar or strip of aluminum or titanium is formed into a hook shape is combined with a rubber band. There are methods for clamping the workpiece using bolt tightening and link/cam mechanisms, as is the case with aluminum building materials, but these methods are preferable for magnetic disks such as those mentioned above. It cannot be said. Covered magnetic disks must not only satisfy the above-mentioned requirements when racking, but also require extremely careful handling during the alumite process, and for example, it is prohibited to cause any scratches to the surface on which the magnetic layer is formed. The above-mentioned method for household goods and building materials cannot be applied at all, since people are not allowed to touch the materials or even touch them.

The present invention was devised after repeated studies in view of the above-mentioned circumstances, and it takes into account not only the basic conditions for racking when anodizing aluminum alloy magnetic disk substrates, but also the unique requirements of magnetic disks. In this way, it is possible to realize racking that satisfies the requirements appropriately. That is, the device according to the present invention uses a pair of disks, and a ring-shaped sealing material made of an insulating material is interposed on the circumferential side of the disks to prevent the electrolytic bath from penetrating the inner hole circumferential side of the donut-shaped plate to be processed. The lead wire is connected to the plate to be processed within this sealing area, and one of the disks is equipped with a pressing mechanism to ensure accurate contact with the plate to be processed, and both disks are fastened together. A fastening mechanism is provided to clamp the plate to be processed and ensure a sealed state. That is, to explain a specific embodiment of the present invention as shown in the attached drawings, the jig main body 2 and the lid body 9 are used as a pair of disks as described above, and both of these parts 2 and 9 are Seal members 6 and 7 such as O-rings are provided around the circumference, and the inner hole of the dot-shaped aluminum alloy disk substrate 1, which is the plate to be processed, is clamped between these seal members 6 and 7. The jig main body 2 has a screw shaft 15 protruding from the center thereof, into which a nut 14 for clamping and tightening as described above is screwed. Cam rotation shaft 1 is concentric with joint shaft 15
6 is formed, and the shaft hole of the eccentric cam 3 as shown in FIG. 2 is fitted into the cam rotation shaft 16. A hole 17 for receiving the eccentric cam 3 is formed in the jig main body 2 so as to be concentric with the rotating shaft 16, and a receiving portion for the elastic conductor piece 13 is formed in a part of the circular hole 17. 18 is formed continuously, that is, the elastic conductor piece 13 is positioned so that its middle part is in contact with the rotational circumferential side of the eccentric cam 3 in the normal state where both ends of the elastic conductor piece 13 are held in the receiving part 18. A contact portion 12 is provided in a middle portion of the elastic conductor piece 13 so as to protrude outward by brazing or the like. A needle bearing 4 is provided on the circumferential side of the eccentric cam 3, so that the rotational extrusion of the elastic conductor piece 13 is smoothed.
An O-ring 8 is interposed between the center hole of the lid 2 and the screw shaft 15, which is fitted onto the screw shaft 15. Further, an electric wire sleeve 10 is provided at the center of the jig main body 2, and the electric wire 5 is introduced into the rotation shaft 16 and connected to one end of the elastic conductor piece 13 described above.

It is preferable that the jig main body 2, lid body 9, and nut 14 as described above are made of hard vinyl chloride, etc., the eccentric cam 3 is preferably made of hard nylon, etc., the elastic conductive piece 13 is made of phosphor bronze, and the contact portion 12 is made of hard vinyl chloride. is manufactured from copper pieces, etc.

To explain the operation of using the device according to the present invention as described above, the magnetic disk substrate 1 is set on the jig main body 2 as shown in FIG. 2, and when the eccentric cam 3 is rotated, the The needle bearing 4 acts on the middle part of the elastic conductive piece 13 and pushes up the contact part 12 as shown by the imaginary line in FIG.
can be pressed against the inner edge of the disk substrate 1, and the electrolytic power from the electric wire 5 will be supplied to the aluminum alloy substrate 1. In this state, cover the lid 9 and screw the nut 14. By tightening it onto the shaft 15, latching is completed.

However, when this item is immersed in the electrolyte, it is sealed with sealing materials 6 to 8, 10 such as O-rings and does not enter the jig, and the inside of the jig is in an air atmosphere. An alumite coating is applied only to the parts that protrude from the tool. In this type of disk substrate with a lid, the peripheral edge of the inner hole is the part that will be clamped to the sputtering device in the subsequent sputtering process, and the fact that the alumite film, which is an insulator, is not formed on this part is especially important when removing the film in that part. This is extremely convenient since no additional steps are required. Note that the size of this ring-shaped non-film-formed portion can be appropriately determined depending on the sputtering apparatus, and of course, it can also be made to have different widths on the front and back sides of the substrate 1.

The items racked as described above are suspended and immersed in an electrolytic bath by a hanging device fixed to the jig body 1, and in any case, the electrolytic bath has a considerable flow rate (by stirring, etc.). Stable processing can be carried out inside.

According to the present invention as explained above, a donut-shaped aluminum alloy magnetic disk substrate is effectively racked at its center, immersed in a treatment bath, anodized, and further electrolyzed with metal particles into the alumite holes. An annular sealing material is attached to the circumferential side of the inner hole of the disk substrate and clamped and tightened by the jig body and the lid, so that the inner hole circumferential side It has the functions and effects of preventing the electrolyte from penetrating into the area and forming a non-film-forming area, which is convenient for subsequent sputtering, and is a highly effective device in practical terms.

[Brief description of the drawings]

The drawings show embodiments of the invention,
FIG. 1 is a sectional view showing the clamped state, and FIG. 2 is a general plan view thereof. However, in these drawings, 1 is an aluminum alloy magnetic disk substrate, 2 is a jig body, 3 is an eccentric cam, 4 is a needle bearing, 5 is an electric wire, and 6
~8 and 11 are sealing materials such as O-rings, 9
1 is a lid body, 10 is an electric wire sleeve, 12 is a contact part, 1
3 is an elastic conductive piece, 14 is a nut, 15 is a screw shaft,
16 is a rotating shaft, 17 is a hole, and 18 is a receiving portion.

Claims (1)

[Scope of utility model registration request] It has a jig body attached to one side of an aluminum alloy disk substrate with a donut-shaped center opening, and a lid body attached to the other side of the substrate, and a rotation shaft is attached to the center of the jig body. and a threaded shaft protrudingly provided, an eccentric cam is rotatably provided on the rotating shaft, and an elastic conductive piece is partially positioned in the passive area of the eccentric cam, and the elastic conductive piece is provided with a forms a contact portion that comes into contact with the disk substrate mounted on the jig body, and annular sealing materials are disposed on the jig body and the lid body, respectively, and are positioned on the circumferential side of the opening in the disk substrate. A jig for electrolytic treatment of an aluminum alloy magnetic disk substrate, comprising a nut for tightening the lid toward the jig body, which is screwed onto the screw shaft.