JPS62291725A - Manufacture of hard disk - Google Patents

Abstract

PURPOSE:To eliminate the mechanical machining process by using a masking member made of an elastic member at a background chemical plating nickel phosphor plating process and a support fixture having a spring incorporated with the masking member so as to apply the masking. CONSTITUTION:A hard disk 4 is placed to an outer diameter of a masking ring 1 and a taper ring 3 is pushed into a spring ring 2, then the taper part of the spring ring 2 is widened to spread the diameter of a recessed groove, then the masking ring 1 is spread and its outer diameter is increased and in circumscription with the inner diameter of the hard disk 4. In pushing the ring 3 further, while the masking ring 1 made of a fluorine rubber is deformed by the elasticity, the ring 1 is interlocked with the hard disk 4 for the press contact. Thus, the inner diameter side cylindrical part 6 of the hard disk 4, a chamferred slope 7 and a part of the inner diameter side part 8 on the front and rear face are masked by the masking ring 1 and set by a support jig at the same time.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] Base electroless nickel phosphorus plating (hereinafter referred to as
The present invention relates to a masking method when performing base plating in a method of manufacturing a hard disk in which a thin film is formed by applying base plating (hereinafter referred to as base plating) and then applying magnetic electroless nickel cobalt plating (hereinafter referred to as magnetic plating).

[Conventional technology]

The mainstream of hard disks used in small hard disk devices is coated hard disks, which are manufactured using a spin foot method in which magnetic material is dropped onto a hard disk substrate that is rotated at high speed, and a certain coating is formed on the surface by centrifugal force. However, the plated hard disk in which magnetic material is formed on a hard disk substrate by plating according to the present invention is a relatively new technology, has a low market share, and is not a widely adopted manufacturing technology. Various manufacturing methods have been introduced in academic societies and specialized journals, but both advanced and new manufacturers are currently building their own unique know-how and conducting research and development. Therefore, the 0-plated hard disk, which describes the applicant's own original Ω initial manufacturing method as the prior art, involves applying base plating on an aluminum substrate and then applying magnetic plating thereon as a separate process.

In order for the latter magnetic plating to start stably, since it is electroless plating, it is necessary that the aluminum surface partially bulges out.

Therefore, it is necessary to perform the base plating in a way that does not leave only a portion of the base plating attached. However, the method using masking tape, which is generally used as a masking method for plating, and the method widely used for configuring circuit patterns on printed circuit boards, etc. are required. The commonly used methods, such as the masking method using a resist, require a hard disk base plating process that requires an etching process using a strong acid, that the base plating solution is a strong alkali, and that it requires a series of steps. The various processing solutions that are
), and because water is washed in the middle, it is subject to a harsh heat cycle, which damages the masking material and makes it impossible to use.

Undercoat plating was applied to the entire hard disk board at the same time, and as an intermediate process, the cylindrical surface on the inner diameter side of the board was turned using a machine such as a lathe and a grinder (our company used lathe processing). [Problems to be solved by the invention] However, with the above-mentioned conventional technology, the hard disk is easily scratched when set in the chuck of a lathe, and the turning process is difficult. The present invention has the problem of imposing a burden on manufacturing costs.The present invention is intended to solve this problem, and its purpose is to eliminate the machining process itself using mechanical equipment such as turning. The purpose of the present invention is to provide a special masking method that is simple and low in manufacturing cost for the base plating process.

[Means for solving problems]

The hard disk manufacturing method of the present invention is a hard disk manufacturing method in which base electroless nickel phosphorus plating is applied on an aluminum substrate, and then magnetic electroless nickel cobalt plating is applied to form a thin film. , a masking member made of an elastic material such as a fluororesin or polypropylene, and a support having a spring ring that integrates the masking member, the inner cylindrical part, the chamfered slope part, or the inner diameter part of the front and back surfaces of the hard disk is Overall or each no i
[Function] According to the above configuration of the present invention, fluororesin and polypropylene (p-p
) is used as a masking material, and its elasticity is brought into pressure contact with the entire inner cylindrical part, the chamfered inclined part, or the inner diameter side parts of the front and back surfaces, or a part of each, to provide a masking function.

The pressure applied to the masking material is controlled by a pair of M
There are methods such as spreading force using a WM taper, and methods of crushing the elastic ring on two planes and elastically deforming it in the outer radial direction. The masking elastic body is deformed by the former primary pressure, and the pressure due to the elasticity of the masking material itself is added as a secondary pressure, and the masking material is pressed against the hard disk to realize the masking function. At this time, the masking method shown in the embodiment is applied. When removed, it also acts as a support for the hard disk, performing two functions: masking and support at the same time.

〔Example〕

FIG. 1 is a main sectional view showing a state in which a hard disk according to an embodiment of the present invention is set in a set of chucks, and a masking ring 1 made of fluororubber is pressed against the inner cylindrical surface of the hard disk 4. The masking ring 1 is inserted into the spring ring 2 shown in a perspective view in FIG.
) is in 5. The rotary shaft 5 contains 50 sets of setting jigs in which the hard disk 4 is supported by the above-mentioned structure, stacked one on top of the other, and one set is firmly fixed with a nut using a screw on the other. . A gear is attached to the rotating shaft 5 at the end on the perpendicular side. The rotary shaft 5 is set in a magazine for the base plating line, which has a mechanism for rotating two to four rotary shafts 5 in which 50 hard disks 4 are set, and a series of processing steps of the base plating line are carried out. A transport robot transports the magazine and performs plating.

The supporting action of the hard disk 4 is performed as follows.

The spring ring 2 has a spring ring groove 2' inclined with respect to the axis shown in FIG.

A masking ring 1 having an inner diameter smaller than the diameter of the groove when the spring ring 2 compresses the spring ring groove 2' into the groove is inserted into the groove. At this time, the outer diameter of the masking ring 1 is smaller than the inner diameter of the hard disk 4. In this state, the hard disk 4 is positioned on the outer diameter of the masking ring 1, and the tapered ring 3 is attached to the spring ring 2.
push it into

The diameter of the concave groove of the spring ring 2 is also widened by widening a portion of the taper. Therefore, the masking ring 1 is also pushed out and its outer diameter becomes larger, and when it is pushed in further, the masking ring 1 made of fluororubber becomes larger.
deforms due to elasticity and presses the hard disk 4 into itself. In this way, the inner cylindrical portion 6, chamfered slope portion 7, and inner portions 8 of the front and back surfaces of the hard disk 4 are partially masked. O is masked by ring 1 and set on a set of supports at the same time After the plating process is completed, taper ring 3 and spring ring 2
By removing a portion of the taper, the hard disk 4 is removed from the masking ring 1 due to the aforementioned reverse diametric contraction. By repeating this operation, the set of setting jigs is used several times. The spring ring 2, tapered ring 3, and rotating shaft 5 are made of polypropylene (PP).

FIG. 4(d) is a perspective view of the masking ring 1.

FIG. 4(6), FIG. 4(6), and FIG. 4(d) each show the cross-sectional shape of the masking ring 1,
FIG. 4(6) shows a masking ring having a rectangular cross section, which is a custom-made molded ring. Figure 4(c) shows an example of a solid O-ring using a standard commercially available product @ Figure 4(d) is a hollow pipe shaped into a ring, which is more durable than fluoro rubber. An example is shown in which when PFA, which has good chemical properties, is used, the low elasticity of the material itself is compensated for by the enclosed gas (air, etc.).

[Effects of the Invention] As described above, according to the present invention, in a hard disk manufacturing method in which a thin film is formed by plating, a machining process such as cutting and grinding using a lathe is performed as an intermediate process between base plating and magnetic plating. This has the effect of providing a masking method in the discontinued base plating process. Furthermore, when compared with masking methods using resists used for printed circuit boards, etc., and methods using masking tapes used for general plating masking, specialized methods such as resist coating or tape application, peeling, and tape removal are used for masking purposes. It also has the effect of providing an efficient masking method that includes the function of supporting and setting without adding the process of 1, and also allows the masking material to be used repeatedly.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of the hard disk manufacturing method of the present invention, and is a main cross-sectional view showing a hard disk set in a set of masking and supporting tools. 2 is a perspective view showing the hard disk 4 shown in FIG. 1; FIG. 3 is a perspective view showing the spring ring 2 shown in FIG. 1. FIG. 4(a) is a perspective view showing the masking ring 1 of FIG. 1, and FIG. 4(b) is a cross-sectional view of the masking ring 1 in a rectangular shape. FIG. 4(c) is a cross-sectional diagram of the masking ring 1 having a solid circular shape. Figure 4(d) is a cross-sectional diagram when the masking ring 1 is a hollow pipe. 1...Masking ring 2...Spring ring 2'...Spring ring groove 3... Taper ring 4... Hard disk 5... Rotating shaft 6... Inner diameter cylindrical portion 7... Chamfered inclined portion 8... ...Inner diameter portion and above Applicant Seiko Epson Co., Ltd. Agent Patent attorney Tsutomu Mogami and 1 other person Hiroshi Kanden

Claims (1)

[Claims] Electroless nickel phosphorus plating is applied to the aluminum substrate.
Next, in a method for manufacturing a hard disk in which magnetic electroless nickel cobalt plating is applied to form a thin film, a masking member made of an elastic material such as fluororesin or polypropylene is integrated with a masking member made of an elastic material such as fluororesin or polypropylene in the base electroless nickel phosphorus plating step. A method for manufacturing a hard disk, characterized in that the whole or a portion of each of the inner cylindrical portion, the chamfered inclined portion, or the inner diameter portions of the front and back surfaces of the hard disk is masked using a support having a spring ring.