JPH0829382B2 - Method for manufacturing pressed part having circular surface - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pressed part used for electronic equipment such as a cassette mechanism or other electronic equipment, and more particularly to a pressed part, particularly a metal material. The present invention relates to a manufacturing method of forming the circular arc surface by press working.

[Background of the Invention and Prior Art]

7 and 8 show a part of the cassette mechanism mechanism, FIG. 7 is a side view, and FIG. 8 is a view of FIG. 7 viewed from the lower side. On the base 3 of the cassette mechanism, a resin-molded disk-shaped component 4 that rotates around a shaft 5 is inserted. This resin-molded disk-shaped component 4
An eccentric disk 4a, which is slightly smaller than the disk-shaped component 4 and rotates eccentrically around a shaft 5, is inserted into the shaft 5 so that 4 and 4a rotate integrally about the shaft 5. Has been formed. The arm 1 is formed by bending a substantially T-shaped metal plate into a U-shaped cross section, and a shaft 2 is attached to a linear tip end of the arm 1. The tip side face of the shaft 2 and the side face of the eccentric disc 4a slide on each other. Oval-shaped openings 1a, 1a are provided at both end portions which are biased so as to come into contact with each other and further extend in the left-right direction in contact with the base 3 of the arm. The arm 1 has a screw 6 fixed to the base 3.
The oval-shaped opening 1a slides on the surfaces of the diameters 6a and 6b, and the amount of movement of the side surface, which is eccentrically rotated by the eccentric disc 4a using the screw 6 as a guide, is transmitted to the arm 1 as lateral movement via the shaft 2. are doing. Therefore, as shown in FIG. 8, a resin-molded disc-shaped component 4
When the arm 1 is slid through the shaft 4 and the component 4a, in order to obtain a smooth surface with the molded component, the component forming the shaft 2 is made of a precisely ground material and is attached to the tip of the arm. It is general that they are separately fixed by such as.

[Problems of conventional technology]

Considering the above technical background, in eccentric discs 4a in electronic devices such as cassette mechanisms, etc.
In order to make the contact surface with and smooth, the surface-polished shaft 2 is used by being processed on the arm 1. In order to obtain a smooth surface that is in sliding contact with each other in this manner, the shaft 2 needs to be machined with high precision by polishing the entire circumference of the surface, and more man-hours such as press-fitting the shaft 2 on the arm 1 are required. However, the angle at which the shaft 2 slides in contact with the disc 4a is actually about the entire circumference.
The position is about 1/3, and there are many non-sliding surfaces on the shaft that has been cut and polished on the entire circumference, and there are many functional wastes. Further, there are many problems that skill is required for assembling the shaft and the processing cost becomes high.

[Outline of Invention]

According to the present invention, the section angular section is stamped with a stamping member having an arc section larger than the section width to move the metal of the section square section into the arc section space in the stamping member. It is characterized in that an arcuate surface having a width larger than the cross-sectional width before being pressed is formed integrally with the metal member to be pressed. In the present invention, since the arcuate surface is pressed by pressing the surface of the metal member having a square cross section with the embossing member, the arcuate surface can be formed easily and at low cost.

Example of the present invention

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings of FIGS.

FIG. 1 is a perspective view showing an embodiment of a press part in which an arc-shaped shaft (sliding part) is integrally provided at the tip of an arm manufactured by the manufacturing method of the present invention, and FIGS. It is sectional drawing which shows the process order of the front-end | tip of the arm of FIG.

First, reference numeral 12 shown in FIG. 1 is a press part mounted on electronic equipment such as a cassette mechanism. The tip portion of the pressed part 12 is composed of an arc surface 13a and a non-arc surface 13 manufactured by the manufacturing method described in detail in the present invention.

Next, a method of manufacturing a press part having an arc surface and its structure will be described.

The sectional view shown in FIG. 2 shows an upper die 9 as an embossing member, a lower die 10 and a metal member which is an embossed member as a rectangular cross section before embossing and an arcuate cross section after embossing. It shows the relationship of.
The inside of the upper die 9 which is the first stamping member has an arc-shaped stamping portion B.
have. The arc-shaped stamped portion B is formed in a concave shape, and the left and right openings facing the lower die inside the concave portion are expanded in a tapered shape, and the lower die 10 as the second stamped member has a convex cross-section. It has a shape. The cross-sectional height of the angular metal member 8 before the embossing and the arc-shaped cross-sectional height of the upper die 9 which is the first embossing member are almost equal, but the cross-sectional width is higher than that of the angular metal member 8. The arc-shaped width of the mold 9 is increased. Therefore, spaces 11a and 11b, which are different from the cross-sectional width of the metal member 8, are formed at both ends of the arc-shaped cross section of the upper die 9. In the above configuration, the upper die 9 as the first embossing member and the lower die as the second embossing member
As shown in FIG. 3 (a), 10 moves downward to press-form an arc surface on the metal member 8. In that case, the corners 8a and 8b facing the upper die 9 of the metal member are pressed by the arcuate surface B inside the upper die 9 which is the first embossing member, so that the upper die 9 which is the first embossing member is pressed. The material of the corners 8a and 8b moves to the spaces 11a and 11b on the side surface, and a smooth arc surface B having a continuous cross section of the metal member 8 is stamped as shown in FIG. 3 (b). It is also possible to form an arc surface having an arbitrary cross section by changing the shapes of the upper die 9 which is the first embossing member and the lower die 10 which is the second embossing member. 4 and 5 (a) and 5 (b) show an embodiment of the present invention, FIG. 4 is a perspective view, and FIGS. 5 (a) and 5 (b) are sectional views showing the order of processing. Is.

The shaft portion at the tip of the arm of the press part 12 shown in FIG. 4 is composed of two arc surfaces 13a, 13a manufactured by the manufacturing method shown in FIGS. 5 (a) and 5 (b).

The cross-sectional view shown in FIG. 5 (a) is an upper die 9 which is a stamping member.
Both of the lower mold 10 and the lower mold 10 have an arcuate stamped portion on the inside. When the square metal member 8 is stamped by the stamping member having the above-mentioned structure, the material of the square metal member 8 moves to the spaces 11a and 11b on the side surfaces of the upper mold 9 and the lower mold 10 for the reason already described. As shown in FIG. 5 (b), the arcuate surfaces facing the upper and lower cross sections of the metal member 8 are stamped. In this case, when the upper die 9 moves downward with respect to the angular metal member 8 and at the same time the lower die 10 moves upward and is uniformly pressed, both arc surfaces can be finished in good shape.

〔The invention's effect〕

As described above, according to the present invention, the effects listed below can be obtained.

(1) Since the arcuate surface is press-formed by pressing the angular portion of the cross-section of the metal member to be pressed by the pressing member, there is a step of fixing the shaft that has been conventionally cut by caulking or the like. It can be deleted and the working process can be simplified.

(2) Since the angular section having the arcuate surface can also be pressed, the manufacturing process can process the part only by pressing, and the entire part can be provided at low cost.

(3) Since the shaft of any cross section can be machined by the shape of the upper mold and the lower mold, various sliding motions can be set and the variety of functions of the shaft parts can be increased.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a main part of a bearing of a cassette mechanism according to an embodiment of the present invention, FIGS. 2 and 3 are cross-sectional views each showing a processing sequence of the present invention, and FIG. FIG. 5 is a perspective view of another embodiment of the present invention, FIG. 5 is a sectional view showing the processing sequence of FIG. 4, FIG. 6 is a perspective view of a bearing component of a conventional cassette mechanism, and FIG. FIG. 8 is a side view showing the main part of the cassette mechanism mechanism of FIG. 7, and FIG. 8 is a view of FIG. 7 seen from the lower side. Reference numeral 8 ... Rectangular metal member in cross section, 8a, 8b ... Corner portion of rectangular metal member in cross section, 9 ... First embossing member, 10 ... Second embossing member, 11a, 11
b ... Space on the left and right of the stamping member,

Claims (1)

[Claims] 1. A part of a metal member to be pressed is formed into a square cross section, and the square cross section is pressed with a press member having an arc-shaped cross section larger than the cross section width thereof. The metal having the cross-section angular portion is moved into the space of the arc-shaped cross-section to integrally form an arc surface having a width larger than the cross-sectional width before stamping on the metal member to be pressed. A method for manufacturing a pressed part having an arc surface.