JPS633423B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing electrical contacts for connectors.

Conventionally, the base material used to manufacture electrical contacts for connectors has been prepared using a copper alloy base material such as phosphor bronze in order to improve the adhesiveness of the solder when soldering the connector terminals and lead wires after the mold is assembled. A thin solder plated plate is used.
Further, when electrical contacts for connectors are continuously and automatically mass-produced, a hoop-shaped base material must be used, and therefore solder plating is applied to the entire surface of the hoop-shaped base material.

On the other hand, when welding the electrical contact material to the base material,
Generally, projection welding is used to stabilize the weld and strengthen the joint, but since the surface of the base material is plated with solder, if you try to weld by sandwiching it between the upper and lower electrodes, the projection welding will fail. It sinks into the soft solder plating, and the contact area between the projection and the solder plating changes greatly due to variations in the thickness of the solder plating and the clamping force of the upper and lower electrodes, making the welding conditions inconsistent. As a result, not only welding defects occurred, but also stable joint strength could not be obtained. For this reason, as shown in Fig. 1, an electrical contact material 3 is used in which the joint surface of the contact material 1 is clad with a material 2 with good weldability. Since the hoop-shaped contact material is supplied from a direction perpendicular to the longitudinal direction and welding, cutting, or cutting and welding is performed, there is a problem that the welding position is large.

The present invention has been made in view of these circumstances, and it is an object of the present invention to provide a method of manufacturing an electrical contact for a connector, which allows the contact material and the base material to be always welded at a fixed position, and which has stable bonding strength without welding defects. That is.

In the method of manufacturing an electrical contact for a connector according to the present invention, as shown in FIGS. 2 and 3, the surface of a hoop-shaped base material 4' on which solder plating 5 is applied is continuously supplied, at least at regular intervals. Solder plating is removed to form a recess 6, and contact metal is applied to the surface layer 7 and contact metal is applied to the lower layer 8 with a width corresponding to the recess 6 from a direction perpendicular to the longitudinal direction of the hoop-shaped base material 4'. Cu with welding projection or
Insert the clad contact material 9 containing Cu alloy,
It is characterized by being welded.

In the method of manufacturing an electrical contact for a connector of the present invention, a hoop-shaped base material 4' applied to the solder plating 5
There are two types of recesses 6 formed at regular intervals on the surface of the board: recesses formed by grinding only the solder plating layer, and recesses formed by grinding the base including the solder plating layer to a certain depth. It is also possible to have a concave portion. The reason why the recess 6 is formed on the surface of the hoop-shaped base material 4' having the solder plating 5 in this way is to keep the welding conditions constant and to fit the contact material 9 in the welding process. In other words, this is to firmly bond the contact material 9 and the base material 4' at a fixed position so that they will not come off during use. On the other hand, the reason why a clad material with a contact metal in the surface layer and Cu or Cu alloy in the lower layer is used as the contact material 9 is that regardless of the weldability of the contact metal in the surface layer in the base material recess 6,
This is to ensure stable welding at all times using Cu or Cu alloy, which has good weldability.

If the thickness of the Cu or Cu alloy is made to correspond to the depth of the base material recess 6, the lower layer 8 of the Cu or Cu alloy will be exposed on the surface as shown in Fig. 2 when the contact is formed after welding. First, the contact material can be made of a surface layer 7 made entirely of contact metal. Further, the shape of the base material recess 6 and the shape of the corresponding contact material 9 are not limited to those shown in FIGS. 2 and 3, but may have a cross-sectional shape as shown in FIG. 4a, for example. Something,
When this is welded and then formed, it becomes the cross-sectional shape shown in FIG. 4b.

Next, in order to clarify the effects of the method of manufacturing an electrical contact for a connector according to the present invention, specific examples and conventional examples thereof will be described.

〔Example〕

A hoop-shaped base material 4' as shown in Figs. 2 and 3 made of phosphor bronze with a width of 0.76 mm and a height of 0.51 mm with a Pb+Sn plating of 3μ and an additional Sn plating of 2μ on the surface is continuously supplied, and Recesses 6 with a length of 0.46 mm and a depth of 0.20 mm in the longitudinal direction of the base material are formed by grinding at regular intervals, and the recesses 6 are sequentially 0.45 mm wide and Au A hoop-shaped clad contact material 9 with a surface layer 7 of -25w/oAg alloy 0.22 mm thick, a lower layer 8 of Cu-30w/oNi alloy 0.20 mm thick, and a lower projection 8' with a curvature of 0.05R is inserted. 50,000 electrical contacts for connectors were produced by welding, then cutting and forming.

Incidentally, the hoop-shaped clad contact 9 may be cut before welding to the hoop-shaped base material 4'.

[Conventional example]

A hoop-shaped base material made of the same material and having the same dimensions as in the example is continuously supplied, and the width is 0.45 mm, the thickness is 0.22 mm from the right angle direction, and the curvature of the lower projection is maintained at regular intervals in the longitudinal direction on the surface. 0.05R Au−25w/
Hoop-shaped contacts made of oAg alloy were intermittently supplied, placed, welded, cut and formed to produce 50,000 electrical contacts for connectors.

Each of the electrical contacts for connectors manufactured in this manner
When we measured the bonding strength of 100 pieces, the maximum for the conventional example was 10.5Kg, the minimum 7Kg = 9.5Kg, R = 3.5Kg
In contrast, the maximum weight of the example was 13.1Kg,
The minimum weight was 10.8 kg, = 12.0 kg, and R = 2.3 kg, and the bonding strength of the contact material was strong and stable with little variation.

Also, regarding the welding position deviation, the conventional example had a deviation of ±0.05mm, while the example had a deviation of ±0.05mm.
The deviation was only 0.02mm.

As detailed above, according to the method for manufacturing electrical contacts for connectors according to the present invention, compared to conventional manufacturing methods, there are no welding defects, the joint strength is strong, the joint strength is stable with little variation, and the welding position accuracy is high. Since it is possible to manufacture electrical contacts for connectors with high resistance, it has great practical effects.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing the welding state of the clad contact material and base material used in the conventional manufacturing method of electrical contacts for connectors, and Fig. 2 is the manufacturing method of electrical contacts for connectors according to the present invention. FIG. 3 is a plan view showing the process, FIG. 3 is a longitudinal sectional view thereof, FIG.
FIG. 2 is a longitudinal cross-sectional view showing a state in which the concave portion of the base material and the contact material are joined. 4'... Hoop-shaped base material, 5... Solder plating, 6
... recess, 7 ... surface layer, 8 ... lower layer, 9 ... hoop-shaped clad contact material.

Claims (1)

[Claims] 1. At least the solder plating is removed at regular intervals on the surface of the hoop-shaped base material that is continuously supplied with solder plating to form recesses, and the recesses are sequentially perpendicular to the longitudinal direction of the hoop-shaped base material. Manufacture of an electrical contact for a connector characterized by inserting and welding a clad contact material having a width corresponding to the recess in a direction in which the surface layer is made of contact metal and the lower layer is made of Cu or Cu alloy with a welding projection. Method.