JPS63207479A - Manufacture of lower electrode for welding electric contact - Google Patents

Abstract

PURPOSE:To obtain an electric contactor with high dimensional accuracy by machining the periphery of the upper edge part of an electrode material to provide a step part and afterward, performing the punching on the upper surface of a projection part to form a recessed part for burying an electric contact and stabilizing the welding strength of the electric contact to a stand material. CONSTITUTION:The periphery of the upper edge of the prismatic electrode material 8' is machined to provide the step part 11 and afterward, the electrode material 8' is held in a holder 7'. An instep-shaped recessed part 2 for burying the electric contact is punched on the upper surface of the projection part 12 formed by the step part 11 by a punch 10' to form an instep-shaped projection part 9' to obtain a lower electrode 1' for welding the electric contact By this method, a breakage of the forming punch is prevented and the electric contactor having the stable welding strength of the electric contact to the stand material is obtained. Further, the electric contactor with high dimensional accuracy without dislocation in the relative position between the electric contact and the stand material is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a lower electrode for electrical contact welding, which is used when producing an electrical contact by resistance welding an electrical contact to a composite material.

(Prior Art) Conventionally, one of the methods for manufacturing electric contacts is a method of resistance welding a contact material to a composite material. In this method, as shown in FIG. 2, an electrical contact 3 is buried in a recess 2 provided at the center of the upper surface of a prismatic lower electrode 1, a base material 4 is placed and positioned on top of the recess 2, and the base material 4 is positioned. Applying pressure to the upper electrode 5 from above,
An electric contact 6 is obtained by resistance welding a base material 4 and an electric contact 3.

To make the lower electrode 1 used in this method of manufacturing an electric contact, a punch 10 having a convex portion 9 that slides on the same plane as a prismatic electrode material 8 held in a holder 7 is used as shown in FIG. The upper surface of the electrode material 8 was pressed to form the recess 2, and the lower electrode 1 was pressed down by 1 inch.

(Problems to be Solved by the Invention) However, in the above method for manufacturing the lower electrode 1, the punch 1
When the upper surface of the electrode material 8 is pressed at 0, the punch 10 may break, or the flat surface of the lower electrode 1 other than the recess 2 may swell as a relief of the material pressed into the recess 2, as shown in FIG. In addition, as shown in Figure 4, the sides bulge, making it impossible to remove them from the holder 7 after pressing with the punch 10, and furthermore, making it difficult to sit the lower electrode 1 after installation, and making the alignment unstable. When the electric contact 3 and the base material 4 were welded together, an electric contact 6 with unstable welding strength was obtained.

Furthermore, if one side of the lower electrode 1 swells as shown in FIG. There was a problem that

For this reason, in the past, the raised portions on the upper surface of the lower electrode 1 and the bulged portions on the side surfaces were polished, but this required a great deal of effort and time.

(Object of the Invention) The present invention has been made to solve the above-mentioned problems. When a recess is formed on the upper surface of an electrode material by pressing a punch, the punch may break, the upper surface of the lower electrode may bulge, or the side surface may The object of the present invention is to provide a method for manufacturing a lower electrode for electrical contact welding that does not swell.

(Means for Solving the Problems) In order to solve the above problems, the method for manufacturing a lower electrode for electrical contact welding of the present invention includes cutting the upper end of a columnar electrode material to provide a stepped portion. Thereafter, a recess for embedding an electrical contact is formed by punching on the upper surface of the convex portion surrounded by the stepped portion.

(Function) As described above, in the method of manufacturing a lower electrode for electrical contact welding of the present invention, a step is formed around the upper end of the electrode material, so the area of the upper surface of the convex portion surrounded by the step is small, and therefore The resistance to the punch when forming a recess for burying an electrical contact by punching is reduced, and the punch does not break. Furthermore, since the escape of the material forming the recessed portion is suppressed within the range of the stepped portion, there is no need for polishing, and furthermore, there is no possibility that the material cannot be removed from the holder. Furthermore, after installing the lower electrode on an automatic welding machine, it will not sit awkwardly or become unstable, so when welding the electrical contact and composite material, you can obtain an electrical contact with stable welding strength. It will be done. In addition, since the lower electrode has no distortion with respect to the axis, there is no deviation in its relative position with the composite material as an electrical contact.
Electrical contacts with high dimensional accuracy can be obtained.

(Example) An example of the method for manufacturing a lower electrode for electrical contact welding of the present invention is shown in FIG.
+, around the upper end of the prismatic electrode material 8' made of Cr1%-Cu with a height of 18 cm in the vertical direction as shown in Figure 1.
After cutting the electrode material 8' by 2IIm in width in the lateral direction and 2fl in the height direction to provide the stepped portion 11, the electrode material 8' was cut as shown in Fig. 1C.
As shown in FIG. 1D, a round-shaped protrusion 9 made of SKD is mounted on the upper surface of the protrusion 12, which is held in the holder 7' and has a length of 5 cranes and a height of 2 m1I formed by the stepped portion 11. ′
A lower electrode for electrical contact welding is formed by punching a round-shaped recess 2' for electrical contact embedding with a width of 1.4 cm, a length of 3.3 cm, and a depth of 0.5 cm using a punch 10' forming a lower electrode for electrical contact welding. I made 1'.

In this way, 100 lower electrodes 1' for electrical contact welding were made, and there was no breakage of the forming punch 10' at all, and the escape of material due to the formation of the concave part 2' was due to the bulge on the side of the convex part 12. No swell of material is observed on the top surface of the convex portion 12, and no bulge of material is observed on the side surface of the electrode body, therefore, the bulge on the side surface of the convex portion 12 is within the range of the stepped portion 11. Therefore, the lower electrode 1' could be easily removed from the inside of the holder 7', and the lower electrode 1' could be used for resistance welding of an electric contact and a composite material without polishing. Furthermore, even after attaching the lower electrode 1' to the automatic welding machine, there was no problem with the seating or the alignment became unstable, so we welded the electrical contact and the composite material, which resulted in an electrical contact with stable welding strength. I got a child. Further, since the lower electrode 1' has no distortion with respect to the axis, there is no deviation in the relative position between the electrical contact and the composite material, and an electrical contact with high dimensional accuracy was obtained.

In the above embodiment, a prismatic lower electrode 1' is made, but a cylindrical lower electrode may also be made.

(Effects of the Invention) As can be seen from the above explanation, according to the method of manufacturing the lower electrode for electrical contact welding of the present invention, there is no breakage of the forming punch, there is no possibility that the holder cannot be removed after manufacturing, and It is possible to obtain an electrical contact that can be easily installed on an automatic welding machine, has stable welding strength between the electrical contact and the composite material, and has high dimensional accuracy with no deviation in the relative position of the electrical contact and the composite material. It is possible to easily obtain a lower electrode for electrical contact welding which is excellent in that it can be used as a contactor.

[Brief explanation of the drawing]

1a to d are diagrams showing the steps of an embodiment of the method for manufacturing a lower electrode for electrical contact welding of the present invention, FIG. 2 is a diagram showing the method for manufacturing an electrical contact, and FIG. Figures 4a, b, and c show defects in the lower electrode obtained by the manufacturing method shown in Figure 3, respectively. It is a diagram. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 (C1) Figure 1 (C) 9'... A/7J shape fJ group Figure 1 (b) Figure 1 (d) ・Convex part Figure 2 Figure 4 Figure (CI) Figure 3 Figure 4 (b)

Claims (1)

[Claims] An electrical device characterized in that a stepped portion is formed by cutting around the upper end of a columnar electrode material, and then a recessed portion for burying an electrical contact is formed by punching on the upper surface of the convex portion surrounded by the stepped portion. A method for manufacturing a lower electrode for contact welding.