JPH0399785A - Testing machine for spot welding electrode - Google Patents

Abstract

PURPOSE:To easily determine the degree of adhesion of respective contact points exposed to central flat parts of cavities of respective electrodes by fitting the respective electrodes into up and down reversely truncated conical cavities of a receiving base and finding continuity on respective lead wires indicated on a continuity inspecting instrument. CONSTITUTION:The electrodes 11 and 12 are fitted respectively into the up and down reversely truncated conical cavities 21 and 31 of the receiving base 10. The presence or absence of continuity on all of plural lead wire groups 1b - 4b and 5b - 8b on the respective cavities 21 and 31 is inspected by the continuity inspecting instrument 15. As a result, the degree of adhesion of the respective contact points 1a - 4a and 5a - 8a exposed to the central flat parts 22 and 32 of the cavities 21 and 31 of the respective electrodes 11 and 12, name ly, the quality of the tip shape of the electrodes 11 and 12 can be easily deter mined. Namely, indicating lamps 1c - 8c do not light up on the contact points which are not brought into contact with the electrodes 11 and 12 among the contact points 1a - 8a. By this method, uselessness to shave off excessively the tips of the electrodes 11 and 12 by a cutting tool for repair can be prevented.

Description

[Detailed description of the invention] <Industrial field of application> Misfire 19 farmer, advance and retreat two metal plates in the market riJ functional 2
During spot welding, the metal plate is held between two electrode rods, a large current is passed between the electrode rods, the resistance heat of the current heats the metal plate, and the pressure is welded. This invention relates to a testing machine for spora l-welding electrode rods.

<Prior art> Spora l-welding electrode rod has its tip 111 cut out with one claw circle &
f4. It is formed in the shape of a truncated circle tfC, and if it becomes worn or deformed with use, it can be repaired by cutting it into a truncated circle tfC shape using a rotating blade for repair. However, due to the shape of the tip of the electrode rod, there is a
7.Is the tip of the electrode rod i? The lil does not cover the entire surface,
Therefore, a large current cannot flow, which may result in welding defects. As shown above, conventionally there is no means to judge the suitability of the shape of the tip fil of a spot welding electrode, that is, the degree of adhesion to the metal plate to be spot welded, and the tip of a worn or deformed electrode is used for repair. There is a problem in that it is necessary to adjust the shape of the tip of the electrode rod by excessively scraping it off with a knife, which reduces the effective utilization rate of the electrode 44<.

<Problem to be solved by the invention> Since the conventional repair of spot welding electrode rods has the problems described above, it is easy to determine whether the shape of the tip of the electrode rod is appropriate or not.
There is a need for a means that can determine the degree of adhesion to a metal plate.

SUMMARY OF THE INVENTION An object of the present invention is to provide a spot welding electrode rod testing machine that solves the problem listed in item L and can determine the suitability of the shape of the tip of the electrode rod and the degree of adhesion to a metal plate.

<Means for solving the problem> This will be explained with reference to the drawings. 1- In order to achieve the purpose,
The spot welding electrode rod testing machine according to the present invention has inverted truncated cone-shaped recesses 21 and 31 formed on both upper and lower surfaces of a short cylindrical pedestal 10 made of an electrical insulator, and a plurality of inverted truncated conical depressions 21 and 31 are formed in the pedestal IO. A plurality of conducting wire groups 1b to 4b, 5b to 8b are buried, and each of the plurality of conducting wire groups 1b to 4b, 5b to 8b is divided into two, and one end of each is connected to the central flat part 2 of the above-mentioned upper and lower recesses 21.31.
2゜32 electrode rod]], +2 contact points 1a-4a, 5a
8a, and the other end is connected to the continuity tester 15.

<Function> The electrode rods 11. and 31 are respectively placed in the upside-down truncated conical recesses 21 and 0 of the pedestal. +2, each electrode rod 11. , 12 recesses 21
．． Each of the contacts 1a to 4 exposed on the central flat part 2232 of 31
．． The degree of adhesion to a, 5a to 8a can be easily determined.

<Example> To explain the example with reference to the drawings, 10 is a short cylindrical pedestal made of an electrical insulator, and 21 and 31 are inverted truncated cone-shaped recesses formed on both sides of the bottom of the pedestal 10, respectively. , ]
, b to 4b, and 5b to 8b are groups of a plurality of conductive wires made of upper T2 silk embedded in the pedestal 10, and each group of conductive wires 1b to 4
b, 5b.~81] is a concave end of the electrode rod 11. +2 contact l;1
4a and 5a to 8a, and the other end is connected to the continuity tester 15. Also electrode rod] 1.12 and conductor 1
A conducting wire 13 is also connected to the ffl inspection machine 15.

Further, the continuity tester 15 is provided with display lamps 1c to 8c, for example, as necessary.

Note that the pedestal 10 has a plurality of chip discharge grooves 23 arranged radially.
．． 33 may be formed.

Next, to explain the operation, the electrode rods 11.12 are respectively fitted into the upside-down truncated conical recesses 21 and 31 of the pedestal 10, and a plurality of conducting wire groups are inserted into each recess 21.31.
By testing the presence or absence of continuity for all of b to 4b and 5b to 3b with the continuity tester 15, each electrode rod 11,
It is possible to easily determine the degree of adhesion to each of the contacts 1a to 4a and 5a to 8a exposed in the central flat portion 22.32 of the 12 recesses 2131, that is, the suitability of the shape of the tip of the electrode rod 11.12. That is, among the contacts 1a to 8a, the electrode rods 11 and 1
For those not in contact with 2, the indicator lamp Ic~8
c does not light up.

<Effects of the Invention> Since the present invention is configured as described above, by simply fitting the electrode rods 1112 into the recesses 21 and 31 of the pedestal 10, each electrode rod 11 and 12 can be attached to the entire surface of the metal plate. It is possible to easily determine whether the electrode rod 11.1.2 is in close contact with each other, and it is possible to prevent waste such as excessively scraping off the tip of the electrode rod 11.1.2 with a repair knife.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of the overall principle, FIG. 2 is a vertically cut front view of the pedestal, FIG. 3 is a 511 side view of the pedestal, and FIG. The bottom view of the pedestal, Figure 5 is the V-V cut end view in Figure 2, and Figure 6 is the vr-v in Figure 2.
It is a cut end view. 1a to 8a Contacts 1b to 8b Conductive wires 1c to 8c Indicator lamp 10 pedestal 11.12 Electrode rod 13.14 Conductive wire 15 Continuity tester 21.31 Recess 22.32 Central flat part 23.33 Foreign matter discharge groove Figure 1, Figure 2 Figure 3 Figure 5 Figure 11 Figure 4 Figure 6

Claims (1)

[Claims] [1] A short cylindrical pedestal (10) made of an electrical insulator is formed with inverted truncated conical recesses (21, 31) on both upper and lower surfaces, respectively, and a plurality of conducting wire groups are formed in the pedestal (10). (1b~4
b, 5b to 8b), and a group of multiple conductors (1b
~4b, 5b~8b) are divided into two, and one end of each is attached to the central flat part (22, 32) of the upper and lower recesses (21, 31).
Contacts (1a~4a, 5a~) for electrode rods (11, 12)
8a) and the other end with a continuity tester (15)
A testing machine for spot welding electrode rods connected to.