JPS5966017A - Method of producing button contact - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing button contacts.

Button contacts are projection welded onto bimetal materials and used in bimetal switches, etc. The contact shape is 3φ to 5φ15φ in diameter, and H111.
Because it is relatively large in front and back, it is manufactured by cutting out 11 pieces.

-4 In other words, the conventional manufacturing method
．． L, a disk 2 is removed from the composite contact plate I at regular intervals, and this disk 2 is formed into an F-type 4 having a spherical recess 3 on the tip 618i and a recess with a projection river ring-shaped groove 5 at the bottom. Projection molding and deburring processing are performed using an upper mold 7 having a tip 6 on the tip surface to form a burr 8 on the outer peripheral surface of the base material 21 and a ring projection 9 on the -L surface of the base material 21. The button contact 10 was manufactured by cutting the edge 8 on the rear outer peripheral surface.

However, according to the conventional manufacturing method, as shown in FIG. 2, when press punching, the base material 21 and the contact material 2
The joint strength of the outer periphery of the joint portion 23 with 2 is weak. Therefore, when projection welding the button contact 10 to a base material and using it as a bimetal contact, the
Because they are used repeatedly at different temperatures, the contact material 22 curls up from the outer joint surface at points where the joint strength is weak due to the difference in thermal expansion coefficient, shortening the distance between the contacts and causing abnormal operation and short circuit accidents.

The present invention has been made in view of the above circumstances, and provides a method for manufacturing a button contact in which the bonding strength of the bonding surface between the contact material and the base material is strong.

The method for manufacturing a button contact of the present invention involves punching out #1 approximately octagonal composite contact piece having a diameter larger than the tape width from a composite contact tape, and contact surface of the punched composite contact piece. This is a method of manufacturing a button contact point, which is characterized in that the outer periphery of the button contact is processed to form a burr, and then the burr is cut.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

As shown in Figure 6, width 4.151m, thickness 211w1
A composite contact tape 11 made of Ag-12%CdO alloy is punched out using a roughly octagonal cutting die with a diameter of 4.5φ1 and a part cut out from a Cu-Ni alloy, to obtain a composite contact piece as shown in FIG. I got 2'.

Next, this composite contact piece 2' is molded into a mold with a thickness of 1.5 mm.
A contact shape having a fin and a projection having a diameter of 5IIll was pressed from the contact surface to the outer periphery to form a composite contact piece 211 with a projection as shown in FIG.

Thereafter, this blank piece 2'' was punched out to obtain a button contact 10' as shown in FIG. 9a.

At this time, a crack g12 is generated in the same part of the button contact 1 as shown in FIG.
It never reaches 0'.

Since the button contact according to the present invention is manufactured by the method described in "2", it has the following advantages.

In the deburring process, not only the base material but also the base material and the contact material are integrated and the joint strength is 13 kg/m♂
10 kg/m" than the conventional method, and can prevent the contact from peeling off from the joint surface when used.

Since the disc-shaped contact shape is left from the octagonal composite contact piece and exposed, the joining strength is increased due to the uneven elongation of the material.

Material loss for button contact products is 7 less than the conventional method.

As described above in detail, according to the present invention, it is possible to obtain a method for manufacturing a button contact with a strong bonding strength of the bonding surface.

[Brief explanation of the drawing]

1 to 5 are diagrams showing the conventional manufacturing method, and FIGS. 6 to 9 are diagrams showing the manufacturing method of the present invention. Figure 1 is a diagram showing the method of punching out composite contact tape, Figure 2 is a cross-sectional view of a composite contact piece, Figure 3 is a cross-sectional view showing the process of forming a burr and projector 9, and Figure 4 is a sectional view of a composite contact piece. 5 is a cross-sectional view of a button contact, FIG. 6 is a diagram showing the method of punching a composite contact tape, FIG. 7 is a perspective view of a composite contact piece, and FIG. 8 is a cross-sectional view of a button contact. Cross-sectional view of the contact,
FIG. 9a is a perspective view showing the contact surface of the button contact, and FIG. 9 is a perspective view showing the contact surface. 2' - Composite contact single piece, 2'' - - - Composite contact piece with a paris, 8' - Paris, io' - Button contact. Applicant ] 11 Chuukikinzoku Jogyo Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6! v! Figure 7 Figure 8 = 83-

Claims (1)

[Claims] Punching out a substantially rectangular composite contact piece having a diameter larger than the tape width from the composite contact tape, cutting out the edges from the contact surface of the punched composite contact piece to the outer periphery, and then cutting the edge. A method for manufacturing a button contact characterized by: