JP2582818B2 - Manufacturing method of rivet type composite electrical contact - Google Patents

Description

The present invention relates to a method for manufacturing a rivet-type composite electrical contact.

(Prior Art) Conventionally, to manufacture a rivet-type composite electrical contact, a second
As shown in FIG. 2B, a carbon material is interposed between a base material 1 formed into a rivet type as shown in FIG. Jig 4
And the brazing material 3 was heated and melted by a torch burner 6 and integrated by brazing to form a rivet-type composite electrical contact 7.

(Problems to be Solved by the Invention) However, in the above-mentioned manufacturing method, if the volume of the brazing material is large, the brazing material 3 wraps around the contact surface at the time of brazing.
Is extremely thin as a necessary minimum and smaller than the diameter of the contact material 2. Therefore, when the brazing material 3 is set in the rivet-type recess 5 of the carbon jig 4, the brazing material 3 is not contained, two brazing materials 3 are stacked, the brazing material 3 is not located at the center portion, The brazing strength is low and the dispersion is large,
Problems such as instability occurred. Workability was also poor.

(Object of the Invention) The present invention has been made to solve the above problems, and an object of the present invention is to provide a method of manufacturing a rivet-type composite electric contact that does not cause brazing defects and has good workability. It is.

(Means for Solving the Problems) A method for manufacturing a rivet-type composite electrical contact according to the present invention for solving the above problems is to cut a thick base wire and a thin brazing wire into predetermined lengths and cut them. It is characterized in that it is formed into a rivet type at the same time as joining by cold press bonding, and then a contact disk is superimposed thereon, heated to melt the braze, and brazed.

(Operation) In the method of manufacturing a rivet-type composite electric contact according to the present invention, as described above, a thick base wire and a thin brazing wire are cut into a predetermined length, and they are formed into a rivet type simultaneously with joining by cold pressing. Therefore, a certain amount of brazing material is surely arranged at the center of the upper surface of the base material. Then, the contact disk is superimposed thereon and heated and melted for brazing, so that a stable rivet-type composite electric contact having a good brazing flow, a high brazing strength, and a small variation can be obtained.

Further, since the base material and the brazing material are formed into a rivet type simultaneously with the joining by cold pressing as described above, the rivet type electrical contact can be manufactured with extremely good workability and efficiency.

(Example) An example of a method for manufacturing a rivet type composite electrical contact according to the present invention and a conventional example will be described.

First, the embodiment will be described. As shown in FIG.
1.95mm diameter base wire 11 made of Ag-Cu10wt% and Ag
1 mm diameter brazing wire 12 composed of Cu 25 wt% -Zn 25 wt% -In 5 wt% is cut into lengths of 3.1 mm and 2 mm, respectively.
1 'and a brazing material 12' are obtained, placed in a mold facing each other, and joined by pressing under pressure in a cold state. At the same time, the head diameter is 4 mm and the head thickness is as shown in FIG. 1b. 0.6mm, leg diameter 2mm,
A rivet-type base material 11 "having a diameter of 3 mm at the center of the upper surface of the head and a height of 0.1 mm and a brazing material 12" having a thickness of 0.1 mm protruding from the upper surface of the head was formed by forming into a rivet mold having a leg length of 1.7 mm. After that, the rivet type base material 1 having 12 ″ with this brazing material
1 "is inserted into the rivet-shaped recess 5 of the carbon jig 4 as shown in FIG. 1c, and a contact disk 13 made of Pd and having a diameter of 4 mm and a thickness of 0.25 mm made of Pd is placed on the upper surface of the head of the rivet-shaped base material 11 '. The brazing material 12 ″ is heated and melted at about 650 ° C. to 690 ° C. by the torch burner 6, brazed, and the rivet-type composite electrical contact 14 is
I got

Next, a conventional example will be described. As shown in FIG.
A rivet-type base material 1 made of Ag-Cu10wt% and having a head diameter of 4mm, a head thickness of 0.6mm, a leg diameter of 2mm and a leg length of 1.7mm, and a disk type of Pd made of 4mm in diameter and 0.25mm thick 3 m diameter consisting of Ag-Cu 25 wt% -Zn 25 wt% -In 5 wt% between the contact material 2
As shown in FIG. 2b, the disc-shaped brazing material 3 having a thickness of 0.1 mm and a thickness of 0.1 mm is inserted into the rivet-shaped concave portion 5 of the carbon jig 4, and the brazing material 3 is heated and melted by the torch burner 6. Thus, a rivet-type composite electric contact 7 was obtained.

The brazing strength of the contact material was measured for each 1000 rivet-type composite electrical contacts of the example and the conventional example thus obtained,
When the quality was inspected, the results shown in the following table were obtained.

The conventional rivet-type composite electrical contact as evident from the above table has low brazing strength, large variation and instability, and as many as five defective parts out of 1,000,
It can be seen that the rivet-type composite electrical contact of the example has high brazing strength, small variation, and is stable, and has no defective products.

In this embodiment, the brazing material is heated and melted by the torch burner 6, but may be heated and melted in an electric furnace.

(Effects of the Invention) As described in detail above, according to the method for manufacturing a rivet-type composite electrical contact of the present invention, a certain amount of brazing material is reliably arranged at the center of the upper surface of the base material, and the contact material is When repeatedly brazed by heating and melting, a stable rivet-type composite electric contact having a good brazing flow, a high brazing strength, and a small variation can be obtained. In the method for manufacturing a rivet-type composite electric contact of the present invention, the base material and the brazing material are joined to each other by cold press bonding and formed into a rivet-type at the same time. And increase productivity.

[Brief description of the drawings]

1a to 1c are views showing steps of a method for manufacturing a rivet type composite electric contact according to the present invention, and FIGS. 2a and 2b are views showing steps of a conventional method for manufacturing a rivet type composite electric contact.

Claims (1)

(57) [Claims] (1) A thick base wire and a thin brazing wire are cut into a predetermined length, and they are formed into a rivet type simultaneously with joining by cold press bonding, and then a contact disk is stacked thereon. A method for manufacturing a rivet-type composite electrical contact, comprising heating, melting and brazing a braze.