JPS6225406A - Manufacture of slide element piece - 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 (Field of Industrial Application) The present invention relates to a method of manufacturing a slider piece used in a precision variable resistor slip ring device, etc.

(Prior art and its problems) Conventionally, in order to manufacture a slider piece, first, as shown in FIG. The spacer 2 supplied from the above is resistance welded, and then the brush wire 1 is sequentially cut at the side ends of the spacer 2 to form a brush contact 3 as shown in Fig. 1C. As shown in Figure 4, the spacer 2 side is resistance welded to the tip of the contact mounting protrusion 4a of the base material 4, and the tip of the brush wire 1' of the brush contact 3 is bent into a chevron shape as shown in Figure 1d. The contact portion 5 was formed to form the slider piece 6.

However, in the manufacturing method of such a slider piece, the brush contact 3 is first made and then resistance welded to the contact mounting protrusion 4a of the base material 4, so there are many steps, poor productivity, and high cost. It became. Also, the contact mounting protrusion 4a of the base material 4
is flat, and the spacer 2 of the brush contact 3 to be resistance welded to it is also flat, so if either the upper or lower resistance welding electrode is tilted even slightly, the brush wire 1'
The current flowing through the welding part is biased in one part, and the heat generated at that time not only causes variations in the bonding strength of the brush wire 1' and makes it unstable, but also causes disturbances in the alignment of the brush wire 1' after resistance welding. was there.

(Objective of the Invention) The present invention has been made to solve these problems, and is capable of achieving sufficient bonding strength of the brush wire without causing any variation, and furthermore, is capable of achieving sliding motion with fewer steps and high productivity. It is an object of the present invention to provide a method for manufacturing a child piece.

(Structure of the Invention) As shown in FIG. 2a, the method for manufacturing a slider piece of the present invention is to form linear protrusions 7 on the surface by driving from the back side in the width direction of the contact mounting protrusion 4a of the base material 4. Next, as shown in FIG. 2C, a large number of brush wire rods 1 are arranged and supplied onto the linear protrusion 7, and the tip portions 1a of the brush wire rods 1 are resistance welded. The brush wire rod 1' is cut to a fixed size, and then the cutting end of the brush wire 1' is bent into a chevron shape as shown in FIG. 2d to form a contact portion 5 to form a slider piece 6'. It is something.

As described above, in the method for manufacturing a slider piece of the present invention, the brush wire 1 is directly resistance welded to the contact mounting protrusion 4a of the base material 4, so the brush wire 1 is resistance welded to the spacer 2 as in the conventional method. The step of making the brush contacts 3 is omitted, increasing productivity and reducing production costs. Further, a linear protrusion 7 is formed in the width direction of the contact mounting protrusion 4a of the base material 4 to which the brush wire l is resistance welded, and the brush wire l
Since resistance welding is performed during resistance welding, even if either the upper electrode 8 or the lower electrode 9 is slightly inclined as shown in FIG. 3, the brush wire 1 is pressed substantially evenly and projection welded. That is, since the void 10 is formed below the linear protrusion 7, the resistance welding waiting line protrusion 7 sinks elastically, and all the brush wire 1 and the linear protrusion 7 are connected to the upper and lower electrodes 8.
．． Since the projection welding is performed while being sandwiched between the joints 9 and 9 at approximately the same pressure, the joint strength is high and stable with little variation. Moreover, when cutting the brush wire 1 after welding,
There is no disturbance in the alignment of the welded brush wires 1', and a slider piece 6' of good quality can be obtained.

Next, specific embodiments of the present invention and conventional examples will be described.

(Example) As shown in Fig. 2a, the tips of two 1fl wide contact mounting protrusions 4a provided parallel to the base material 4 made of nickel silver are driven from the back side in the width direction to give a width to the front surface. 0,2 m
, a linear protrusion 7 with a length of 0.6M is formed, and then Pd35w with a wire diameter of 0.09n is formed on each linear protrusion 7 as shown in Figure 2.
t%, Ag3011t%, Au10-1%, Pt10w
Five brush wire rods 1 made of an alloy of 14 wt. After cutting the brush wire 1' to the specified size, the cutting end of the brush wire 1' has a height of 0.5 mm and a width of 0.5 mm, as shown in Fig. 2d.
The slider piece 6' is bent into a chevron shape with six fins to form a contact part 5.
I got it.

[Conventional example]

As shown in Fig. 1a, brush wires 1 made of the same alloy as in the embodiment and having a wire diameter of 0.09 m are arranged in groups of 5 each, and are intermittently supplied with brush wires 1 arranged at 4.7 m intervals from the side. C
Length 8,6 crane made of u-Ni 30wt%, Iio, 6
The spacers 2 each having a thickness of 0.2 mm are resistance welded, and then the brush wire 1 is sequentially cut at the side ends of the spacers 2 to form a brush contact 3 as shown in Figure 1. 3 is resistance welded on the spacer 2 side to the tips of two 1 m wide contact mounting protrusions 4a provided parallel to the base material 4 made of nickel silver, as shown in FIG. The tip of the brush wire 1' of the contact point 3 has a height of 0.5n and a width of 0.5n.
A slider piece 6 was obtained by bending it into a 6 m+ mountain shape to form a contact portion 5. However, when the bonding strength and alignment state of the brush wires of the slider pieces of the example and the conventional example were measured, the results shown in the table below were obtained.

As is clear from the above table, it can be seen that the brush wire of the slider piece of the example has higher bonding strength and is stable with less variation than the brush wire of the slider piece of the conventional example. Further, the alignment of the brush wires of the slider pieces of the example was extremely good, with no disturbance in the left-right direction unlike the brush wires of the slider pieces of the conventional example.

(Effects of the Invention) As can be seen from the above explanation, the method for manufacturing a slider piece of the present invention involves directly resistance welding the brush wire to the contact attachment protrusion of the base material. The process of resistance welding to create brush contacts is omitted, improving productivity and reducing production costs. In addition, when the brush wire is resistance welded to the linear protrusion that has a gap below the contact mounting protrusion of the base material, even if there is a slight inclination in either the upper or lower electrode, the cushioning effect of the linear protrusion will All brush wires and linear protrusions are pressed almost equally and projection welded, so the joint strength is high and stable with little variation, and the brush wires maintain their original alignment without being disturbed when cut. This has excellent effects such as the ability to obtain slider pieces with high dimensional accuracy and good quality.

[Brief explanation of the drawing]

1a to d are diagrams showing the steps of the conventional method for manufacturing a slider piece, FIGS. 2a to d are diagrams showing the steps of the method of manufacturing the slider piece of the present invention, and FIG. FIG. 3 is an enlarged cross-sectional view showing a state in which a brush wire is projection-welded to a linear protrusion formed on a contact attachment protrusion of a base material by an inclined upper electrode and a normal lower electrode in the manufacturing method of the invention. Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 (CI) 5: Kaku P&M Figure 2

Claims (1)

[Claims] Linear protrusions are formed on the surface by driving from the back side in the width direction of the contact mounting protrusion of the base material, and then a large number of brush wires are arranged and supplied onto the linear protrusions and their tips are resistance welded. Next, the brush wire is cut to a fixed size, and then the cut end of the brush wire is resistance welded and the cut tip is bent to form a contact part to make the slider piece. Production method.