JPS60230314A - Method of producing rivet type electric 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 (Industrial Application Field) The present invention relates to an improvement in a method for manufacturing a rivet-type electrical contact, and particularly to an improvement in a method for manufacturing a rivet-type electrical contact in which the lower end of the leg is chamfered.

(Prior art) Conventionally, as shown in FIG.
In order to manufacture a riveted electric contact 5 that can be easily inserted into the contact mounting hole 4 of the base material 3, the bottom surface is formed as the upper end surface of the dowel pin 6 as shown in FIG. The solid or clad contact material 10 is inserted into the material insertion hole 9 of the die 8 provided with the taper 7, and then the contact material 10 is preformed into a rivet shape using a header bunch 11 as shown in Figure 2. Next, as shown in FIG. 2C, the preformed rivet-shaped contact material 10' was finished formed into a rivet shape using the header bunch 12.

(One problem that the invention attempts to solve) In this method of manufacturing a rivet-type electrical contact, there is a clearance C of about 5μ between the die 8 and the dowel pin 6 as shown in FIG. Contact material 10 as shown in
When the contact material 10 is preformed into a rivet shape, a part of the contact material 10 enters the clearance C as shown in FIG. 3, and a burr 13 is generated. At the time of this preforming, the amount of plastic deformation is small, so the burr 13 is small, but if the preforming is performed as shown in FIG. The neck 13 becomes larger.

When the rivet-type electrical contact 5 is ground, such a burr 13 covers the lower end surface of the leg 1 in a foil-like manner as shown in FIG. 4
When the contact is inserted and crimped, or when used after the contact is installed, it may curl up, resulting in a short circuit or constant ON state, or the burr 13 may break off and enter the operating part of the device, causing a malfunction. There were some problems.

(Objective of the Invention) The present invention has been made to solve this problem, and the above-mentioned burrs are likely to occur because the clearance between the die and the dowel pin is located at the position where the lower end of the contact material first spreads due to narrowing. Focusing on this, a rivet-type electrical contact is manufactured by locating the clearance away from the taper so that no material enters the clearance between the die and the dowel pin.

(Means for Solving the Problems) The method of manufacturing a glue bent type electrical contact of the present invention involves chamfering the lower end of the leg by header processing on a solid or clad contact material or manufacturing a bent type electrical contact as described above. It is characterized by inserting the contact material into the material insertion hole of the die, which has a small-diameter dowel pin arranged at the center of the bottom surface and tapered around the bottom surface, and is processed by hemming.

An embodiment of the method for manufacturing a rivet-type electrical contact according to the present invention will be described below with reference to FIGS. 5a to 5C.

(Example) First, as shown in FIG. 5a, a small-diameter dowel pin 15 is arranged flush at the center of the bottom surface 14, and a material insertion hole 18 of a die 17 with a taper 16 around the bottom surface 14 is filled with solid or solid material. The clad contact material 10 is inserted and then the contact material 10 is preformed into a rivet shape with a header bunch 11 as shown in FIG. 5C.
A rivet-shaped electrical contact 19 was manufactured by preforming the bent-shaped contact material 10' in Step 2 and finishing molding it into a rivet shape.

(Function) The burr 13 produced in this way and produced on the lower end surface of the leg portion 1 of the bent electric contact 19 is extremely minute and can hardly be discerned. This is because even if the clearance C between the die 17 and the dowel pin 15 is about 5μ as in the conventional case, the lower end of the contact material 10 is tapered and the clearance for the dowel pin is not located in the narrowed part, so burrs 13 are less likely to occur. It is from.

(Other Embodiments) In the above embodiment, a small diameter knock pin 1 is provided in the center of the bottom surface 14.
The solid or clad contact material 10 was inserted and set into the material insertion hole 18 of the die 17, which has a taper 16 around the bottom surface 14 and was arranged flush with the contact material 10.
As shown in the figure, a small-diameter dowel pin 15 is arranged protruding from the center of the bottom surface 14, and a solid or clamped contact material 10 is inserted into the material insertion hole 18 of the die 17, which has a taper 16 around the bottom surface 14. , header processing may be performed in the same manner as in the above embodiments.

The rivet type electrical contact 2 thus obtained shown in Figure 6
In No. 0, the knock pin 15 was made to protrude and a recess 21 was formed in the center of the lower end surface of the leg portion 1, so that no burr 13 was generated on the lower end surface.

Further, as shown in FIG. 7a, a small-diameter dowel pin 15 is recessed in the center of the bottom surface 14, and the contact material 10 is inserted into the material insertion hole 18 of the die 17, which has a taper 16 around the bottom surface 14. It is also possible to process the header in the same manner as in the embodiment described above. The thus obtained rivet-shaped electrical contact 22 shown in FIG.
No burrs 13 are generated on the lower end surface.

Furthermore, as shown in FIG.
A small-diameter dowel pin 15 with a spherical dowel pin 5a is arranged so that only the tip surface 15a protrudes, and a taper 1 is formed around the bottom surface 14.
The contact material 10 is inserted into the material insertion hole 18 of the die 17 marked with 6.
It is also possible to insert and set the header and process the header in the same manner as in the above embodiment. The rivet-shaped electrical contact 24 obtained in this way, shown in FIG. No burrs 13 are generated on the end face.

(Effects of the Invention) As can be seen from the above explanation, the method for manufacturing the glue bent type electrical contact of the present invention is to insert a material of solid or Since the clad contact material is set and processed with a heso goo, the clearance between the gou and the dowel pin is not located at the position where the lower end of the contact material first spreads, making it difficult for the material to enter the clearance. An excellent effect is that a rivet-type electrical contact with almost no burrs on the end face can be obtained. In addition, when the bed-shaped electrical contacts obtained in this way are ground, the minute burrs that appear on the lower end surfaces of the legs are worn away, so when they are inserted into the contact mounting holes of the composite material and caulked as in the past, When using the contact after it is installed, there is no chance of the burrs turning over, which prevents short circuits and turning on at room temperature, and prevents burrs from breaking off and getting into the operating parts of the equipment. Since there is no problem, the cause of the failure can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a rivet-type electrical contact and the composite material to which it is attached; FIGS. 2A to C are process diagrams showing a conventional method for manufacturing the rivet-type electrical contact shown in FIG. 1; FIG. a
thru C are enlarged views of part A in FIGS. 2 a through C, respectively.
The figure shows the state of the ridges when the repair type electric contact obtained by the manufacturing method shown in Figures 2a to C is polished, and Figures 5a to C show the manufacturing method of the rivet type electric contact of the present invention. A process diagram showing an example of the above, each a in FIGS. 6 to 8
The figure is a vertical cross-sectional view showing other examples of gouers and dowel pins used in the method of manufacturing a rivet-type electrical contact of the present invention, and each of the figures in FIGS. FIG. 2 is a longitudinal cross-sectional view showing a bent electrical contact that is processed and manufactured. 1------ Monopod part, 2------ Chamfer, 10------
-1 Solid or clad contact material, 11.12------
-Header bunch, 14-1---bottom, 15---
--- Dowel pin, 15a --- Spherical tip surface of knock pin, 16 --- Taper, 17 --- Die, 18 --- Material insertion hole, 19.20. 22.
24-----Rivet type electrical contact, 21-----Concave portion, 23-----One convex portion, 25--One spherical concave portion. Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. Figure 2 (Q) (b) (C) Figure 3 Figure 5 Procedural amendment (formality) Manufacturing method for shaped electrical contacts 3, person making the amendment 5, subject of the amendment Column 6 for a brief explanation of the drawings in the specification, contents of the amendment 1) "Fig. 6" in lines 9 and 10 of page 8 Each of Figures a through 8 will be corrected to ``Figure 6 a, Figure 7 a, and Figure 8 a''. 2) On the 12th line of the same page, change [Figures 6 to 8 are each figure a] to [Figure 6, Figure 7, and Figure 8 are approximately 6
Diagram a.

Claims (1)

[Claims] In manufacturing a rivet-type electrical contact whose lower end of the leg is chamfered by header processing of solid or clad contact material, the contact material is processed into a die with a small-diameter dowel pin arranged in the center of the bottom and tapered around the bottom. A method for manufacturing a rivet-type electrical contact, which is characterized by inserting the material into the hole and processing the header.