JP2002106719A - Sealing member and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem wherein the inside of a main body is polluted by a volatile component in adhesive when using the adhesive when a rubber gasket is mounted on a cover and front and rear parts of the cover are conducted by generation of a gap between a through hole and a connecting part provided integrally with the through hole due to deformation of the gasket when the through hole is formed on the cover and a falling prevention part formed integrally with the gasket is formed on the surface of the cover via the connecting part. SOLUTION: A projection 3 is formed by half blanking on the cover 1, a tip of the projection 3 is expanded in diameter from a base part and the projection 3 is vulcanized and molded so as to be covered by the gasket 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal member comprising a cover attached to a main body and a gasket attached to the cover, and a method of manufacturing the same, and more particularly to a container for accommodating a magnetic head and a magnetic disk of a hard disk drive. The present invention relates to a seal member comprising a cover attached to a main body of the above and a gasket attached to the cover, and a method of manufacturing the same.

[0002]

2. Description of the Related Art For example, according to Japanese Patent Application Laid-Open No. Hei 9-282860, a gasket having substantially the same shape as the sealing surface of a main body of a hard disk drive is separately prepared, and when a cover for the main body of the hard disk drive is screwed to the main body, It is known to set a gasket in a cover and then screw the cover to the body. In this case, since the gasket is formed separately from the cover, there is a problem that the number of parts increases. Therefore, Japanese Patent Application Laid-Open No. 10-331
As described in Japanese Patent Publication No. 981, a plurality of through holes are formed at predetermined positions in a position corresponding to the sealing surface of the main body of the hard disk drive with respect to the cover for the main body of the hard disk drive. When an annular gasket for sequentially connecting the holes is formed on the sealing surface side of the main body, a retaining portion of substantially the same shape as the gasket, provided on the opposite surface, that is, the surface that is outside when attached to the main body, There is a known type that is integrally formed so as to be connected to a gasket on the seal surface side via a connecting portion provided integrally in these through holes.

[0003]

In the case where the through hole is formed in the cover for the main body, the gasket can be directly attached to the cover without using an adhesive.
The surface of the magnetic disk is not contaminated by the volatile components of the adhesive, and the number of parts does not increase. However, when a gap is formed between the through hole provided in the cover and the connecting portion integrally provided in the through hole as described above due to a distortion of the gasket at the time of assembling the main body container, the outside air passes through the through hole. This flows into the inside of the cover for the main body of the hard disk drive through the hole, and a problem occurs that the internal space cannot be kept airtight.

In view of the above problems, it is an object of the present invention to provide a sealing member that can seal a main body using a cover and a gasket without using an adhesive, and a method of manufacturing the same. .

[0005]

According to the present invention, there is provided a seal member comprising a cover attached to a main body and a gasket attached to the cover, the seal member corresponding to a seal surface of the main body. A projection is formed at the position of the cover at a predetermined interval so as to protrude toward the sealing surface, and each of the projections is plastically deformed so that the tip of the projection is wider than the base of the projection. A gasket for covering and sequentially connecting is formed in an annular shape, and when the cover is attached to the main body, the gasket comes into contact with the sealing surface to seal the main body.

In this case, a through-hole or the like penetrating the front and back of the cover is not formed. On the other hand, since the tip of the projection is plastically deformed so as to expand from the base of the projection, the gasket is hard to come off from the projection.

According to a first feature of the method for manufacturing a seal member according to the present invention, in a method for manufacturing a seal member including a cover attached to the main body and a gasket mounted on the cover, the sealing surface of the main body is provided. A first step of projecting the projection toward the seal surface side of the cover by semi-punching performed at a predetermined interval at a position of the cover corresponding to the first step, and extruding the tip of the projection by spreading the tip of the projection. A second step of deforming the projection so that at least a part of the tip is wider than the base of the projection, forming a projection at a predetermined interval on the seal surface side of the cover, and covering each of the projections And a gasket to be sequentially connected is formed in an annular shape.

In the above-mentioned manufacturing method, according to a second feature of the manufacturing method of the seal member according to the present invention, a concave portion which is depressed upward is formed at an upper end of a die for processing the cover. Further, a projection is formed at the bottom center of the recess so as to have an upwardly projecting portion, and a projection is projected to the sealing surface side of the cover by half blanking at a position of the cover corresponding to the sealing surface of the main body. Sometimes, the cover is placed on the die with the seal surface side of the cover facing downward with the opening of the recess positioned at a position where the protrusion projects, and the half-face is placed at a predetermined interval. A projection is formed at a predetermined interval on the sealing surface side of the cover by punching, and a gasket that covers each of the projections and is sequentially connected is formed in an annular shape. In addition, by making the concave portion recessed upward at the upper end of the die into a form in which the bottom surface of the concave portion is wider than the opening of the concave portion, the edge of the opening is closer to the edge of the punch jig in the half blanking process. Since it can be arranged at the position, the shape of the projection is stabilized.

Since the projection is projected from the cover by half blanking, a through-hole or the like penetrating through the front and back of the cover is not formed, and the tip of the projection is plastically expanded so as to extend from the base of the projection. Since the gasket is deformed and formed into a required shape, the gasket is hard to come off from the projection. Further, according to the second feature, since the projection having the required shape is formed in one step, the manufacturing process of the seal member can be shortened.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a box-shaped container (not shown) for accommodating a magnetic disk, a magnetic head, and the like of a hard disk drive, which is screwed into the main unit. A cover for hermetically sealing a disk, a magnetic head, and the like to the outside. The cover 1 is made of sheet metal and is formed by press working. After the press working, a gasket 2 is adhered by vulcanizing a rubber elastic material made of a polymer elastic body. The rubber elastic material constituting the gasket 2 is made of polyethylene propylene rubber (EPDM) or fluoro rubber (FKM), or acrylic rubber, butyl rubber or the like as required. Further, the shape of the gasket 2 is formed in a shape corresponding to a sealing surface formed with a predetermined width along the outer edge of the opening of the main body (not shown). If the gasket 2 is simply vulcanized on a flat surface, the gasket 2 may easily peel off and fall off after vulcanization. Therefore, as shown in FIG. 2, a plurality of protrusions 3 are arranged in advance at positions where the gasket 2 is vulcanized and formed, and the gasket 2 is vulcanized and formed so as to cover each protrusion 3 with a rubber elastic material. I have.
Therefore, the gasket 2 does not easily separate from the cover 1.

As shown in FIG. 3, the protrusion 3 is formed by using a columnar punch 4 similar to the one used for piercing at the position where the gasket 2 of the cover 1 is vulcanized. 4, forming a depression by shearing in the same shape as that of the cover 4 and simultaneously forming a projection on the sealing surface side of the cover 1.
That is, a half blanking process is performed, and the cover 1 is plastically deformed to form the columnar original projections 3 ′. Thereafter, as shown in FIG. 4, the tip of the original projection 3 'is hit with a punch 5 having a conical projection 51 at the tip, thereby forming a projection 3 whose outer diameter is larger than that of the base. In this embodiment, the thickness of the cover 1 is 0.4 mm, and the punch 4 has a diameter of 0.8 mm.
mm, and half-blanking was performed so that the height of the original projections 3 ′ was 0.2 mm. In addition, the diameter at the tip of the projection 3 is increased by 0.2 mm from the diameter at the base by hitting the tip of the original projection 3 ′ with the punch 5.

By the way, in the above-mentioned embodiment, after forming the original projection 3 ', the tip of the projection 3 is enlarged by performing another step shown in FIG. 4 and the projection 3 is formed by two steps of press working. Alternatively, the projections 3 may be formed in one step.
That is, as shown in FIG. 5, the die 6 having a diameter that is increased downward and having a bottomed concave portion 61 provided with a conical convex portion 62 at the center of the bottom is formed using a die 6 and a cylindrical punch 63. Then, the cover 1 is hit with a punch 63 so that a part of the cover 1 projects into the bottomed concave portion 61 and the convex portion 62 expands the diameter in the horizontal direction.

Further, in each of the above-described embodiments, the projection 3 is cylindrical, but may be, for example, a quadrangular prism as shown in FIG. 6, or may be a triangular prism or a sphere. Also,
In FIGS. 4 and 5, the center of the tip of the projection 3 is hit with a conical projection to expand the tip of the projection 3 substantially uniformly in the entire circumferential direction. However, as shown in FIG. Alternatively, the width may be widened by hitting with a projection or the like and deforming only in the left-right direction.

Further, the cover 1 is press-molded into a predetermined shape. At this press molding, at least the original projections 3 'may be formed at the same time, or after the press molding, the formation of the projections 3 is started. Is also good.

Therefore, according to the above embodiment of the present invention, since the gasket can be formed directly on the cover and firmly fixed without using an adhesive, the shape is complicated and the rigidity is low. The gasket itself can be used as a sealing member for those that are difficult to secure shape accuracy and secure mounting, such as the case and cover of a hard disk drive, and the gasket can be handled integrally with the cover, making it easy to handle Suitable for automation lines.

In the above-described embodiment, the rubber elastic body is used as the gasket. However, any elastic member capable of realizing a sealing function may be used. For example, a thermoplastic elastomer may be used.

In the present embodiment, the case of the hard disk drive has been described as the main body, but the present invention can also be applied to other precision components requiring airtightness, such as a microprocessor unit.

[0018]

As is apparent from the above description, according to the present invention, the inside of the main body can be sealed without providing a through hole in the cover, and no adhesive is used. In addition to the fact that the inside is not contaminated, the burrs are formed at the tips of the projections, and the gasket is firmly attached and difficult to detach, so the gasket remains in a fixed state not only in the new assembly of the container, but also in the reassembly. It is easy to reuse the cover.

Further, a gasket alone, such as a hard disk drive case and cover having a complicated shape and low rigidity, can be used as a sealing member for a member for which it is difficult to secure shape accuracy and securely mount the gasket. Since it can be handled integrally with the cover, it is easy to handle and suitable for an automated line.

Since the projections can be formed only by pressing, the cost required for forming the projections is lower than in the case of a cutting step or when a separate component is prepared, and high mass productivity can be expected. In addition, by forming a projection having a required shape using a die, the manufacturing process can be shortened.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a gasket and a projection taken along line II-II in FIG.

FIG. 3 is a view showing a first step of forming a projection.

FIG. 4 is a view showing a second step of forming a projection.

FIG. 5 is a diagram showing another embodiment.

FIG. 6 is a view showing another shape of the protrusion;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover 2 Gasket 3 Projection 6 Dice 61 Depression 62 Projection

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Kishida 3-105 Sugaya, Ageo-shi, Saitama F-term in Fukoku Corporation (reference) 3J040 AA01 AA12 AA17 BA01 EA01 EA15 EA17 EA22 FA05 HA01 HA02 HA15

Claims (3)

[Claims] 1. A sealing member comprising a cover attached to a main body and a gasket attached to the cover,
A projection is formed at a position of the cover corresponding to the sealing surface of the main body at a predetermined interval so as to protrude toward the sealing surface side. A gasket which covers each of the projections and is sequentially connected is formed in an annular shape, and when the cover is attached to the main body, the gasket comes into contact with the sealing surface to seal the main body. Seal member. 2. A method of manufacturing a seal member comprising a cover attached to a main body and a gasket mounted on the cover, wherein a half-punching process is performed at a predetermined interval at a position of the cover corresponding to a sealing surface of the main body. A first step of projecting the projection on the sealing surface side of the cover, and an extrusion process that pushes the tip of the projection to deform the projection so that at least a part of the tip of the projection extends from the base of the projection. Forming a projection at predetermined intervals on the sealing surface side of the cover by the second step, and forming a gasket for covering each of the projections and sequentially connecting the projections in an annular shape; Production method. 3. A method for manufacturing a seal member comprising a cover attached to a main body and a gasket attached to the cover, wherein a concave portion recessed upward at an upper end portion of a die for processing the cover is provided. The bottom surface of the cover is formed so as to extend beyond the opening of the concave portion and to have a convex portion projecting upward substantially at the center of the bottom surface of the concave portion. When the projection is projected to the sealing surface side of the cover, with the opening of the recess positioned at a position where the projection protrudes, the cover is placed on the die with the sealing surface side of the cover facing downward. And a half-blanking process is performed at a predetermined interval to form projections at a predetermined interval on the seal surface side of the cover, and a gasket that covers each of the projections and is sequentially connected is annular. Method of manufacturing a sealing member characterized by forming.