JPS59127979A - Regeneration method of electrode for spot welding machine - Google Patents

Abstract

PURPOSE:To obtain an accurate and clean regenerated electrode by grinding the tip of the electrode by a rotating dresser and removing extraneous matter by blowing fine hard particles onto the contact between the tip of electrode and an object to be welded by a high-pressure gas. CONSTITUTION:A rotary cutter 4 from which a cutting edge at the tip of an electrode that is in contact with the object to be welded is removed is attached to a holder 5. This cutter is rotated by a dresser 3, and the tip of electrode 1 attached to an electrode holder 2 is ground. On the other hand, a guide nozzle 6 is provided on the opening side of the cutter 4, and fine hard particles such as grindstone, sand, etc. are blown from the direction A onto the surface of the contact between the tip of electrode 1 and object to be welded, and adhering impurities are removed. At this time, scattering of blown sand and chips is prevented by a cover 7, and recovered in the direction B by utilizing high-pressure air. Thus, the tip of electrode and its contact with the object to be welded can be cleaned at high accuracy with the electrode attached to the welding machine.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for regenerating an electrode for a spot welder (hereinafter simply referred to as an electrode).

In spot welding, the electrode is the third most important factor in the welding conditions, next to welding current, welding time, and pressure.If spot welding is continued for a long time on the production line, the electrode tip will wear out and the welded material will deteriorate. The area that comes into contact with objects is expanded,
There is a drawback that welding quality becomes unstable.

For this reason, conventionally, in order to stabilize welding quality, it is necessary to maintain the electrode tip diameter within an appropriate range, and when the number of welding points reaches a point where electrode wear is expected, it is necessary to use methods such as air dresser or file finishing. , the tip diameter of the electrode is polished and controlled.

In addition, the air dresser has a weight of 5 to 8 kg as a driving source.
/ cf high pressure air is used to rotate the cutter,
This rotary cutter is pressed against the electrode to grind the electrode.

Incidentally, sanding, which is one of the conventional electrode regeneration methods, requires the skill of the operator and has the disadvantage that it is difficult to grind and regenerate with high precision.

Therefore, most of the conventional electrode regeneration methods use a single-type rotary cutter 4' with the same shape as the electrode, as shown in Figure 1, and grind the electrode with a dresser using high-pressure air or a motor as the drive source. Was.

However, in grinding with a dresser, although it is possible to correct the tip diameter based on the tip diameter, it is difficult to grind the surface of the contact part of the electrode tip with the workpiece into a large radius shape that is almost flat. However, there is a drawback that cleaning cannot be achieved until the surface is free of dirt such as deposits.

By the way, the inventor ground the diameter of the electrode tip using a dresser, and set the guide nozzle 6 on the surface of the contact area of the electrode tip with the object to be welded a little away from the electrode surface, as shown in FIG. By blowing fine hard particles such as sand onto the electrode surface from this guide nozzle 6 using high-pressure gas, the electrode tip diameter can be regenerated by grinding the surface of the contact area of the electrode tip with the object to be welded. We have discovered that it is possible to regenerate an ideal electrode without staining the surface of the tip that contacts the object to be welded.

The present invention is an electrode regeneration method that allows a spot welder electrode to be installed in a welding machine, and to obtain a clean electrode with high accuracy over the diameter of the electrode tip and the contact area between the electrode tip and the object to be welded. The purpose is to provide a method.

This purpose is to provide a method for regenerating the diameter portion of the electrode tip of an electrode for a spot welding machine and the contact portion between the electrode tip and the workpiece, wherein the diameter portion of the electrode tip is regenerated by a drive source such as high pressure air or a motor. At the same time, the contact area of the electrode tip with the object to be welded is coated with fine hard particles such as a grindstone, sand, metal powder, steel balls, etc. under high pressure. This is achieved by a method for regenerating an electrode for a spot welder, which is characterized by removing deposits on the electrode surface by blowing with gas.

The present invention will be described in detail below based on the accompanying drawings. FIG. 3 is an embodiment for carrying out the method of the present invention.

In Fig. 3, a conventional one-character type rotary cutter 4 is shown.
Attach the rotary cutter 4, which has no cutting edge at the tip of the electrode that comes into contact with the object to be welded, to the rotary cutter holder 5.
The rotary cutter 4 grinds the diameter of the electrode tip, and a guide nozzle 6 for spraying fine hard particles is provided below the opening side of the rotary cutter 4, and the fine hard particles are fed from the direction of the arrow to the electrode surface. By blowing with high-pressure air, impurities adhering to the surface of the contact area of the electrode tip with the object to be welded are removed.

In addition, the collection lid 7 prevents the blown fine hard particles and chips cut by the rotary cutter 4 from scattering to the outside, and collects them using high-pressure air when removing the surface, as shown in the figure. The fine hard particles are collected in a container where they are not stored.

Incidentally, large pieces of copper powder cut by the rotary cutter 4 are periodically removed by installing a filter in the middle.

Second, 1: As is clear, according to the method for regenerating an electrode according to the present invention, when the electrode is attached to a spot welder, the diameter of the electrode tip and the object to be welded do not come into contact with each other. This has the advantage that the electrode can be regenerated with high precision and cleanly throughout the area.

[Brief explanation of drawings]

Figure 1 is a diagram showing a conventional electrode regeneration method using a cutter;
FIG. 2 is a diagram showing a method for regenerating the contact portion of the tip of an electrode with a workpiece to be welded, and FIG. 3 is a diagram showing a method for regenerating an electrode according to the present invention. 1 - Electrode 2 - Electrode holder 3 - Dresser - Main body 4 - One turn cutter 4' - Conventional rotary cutter 5 - One turn cutter Holder 6 - - - Guide nozzle '1 - - Recovery lid A - - - m - High pressure air supply direction B - - High pressure air discharge direction Applicant Toyota Motor Corporation 9) Tripping Hinosha

Claims (1)

[Claims] A method for regenerating the electrode tip diameter portion of an electrode for a spot welder and the contact portion between the electrode tip and the workpiece, the electrode tip diameter portion being rotated by a drive source such as high pressure air or a motor, and the electrode tip diameter portion being rotated by a drive source such as a high pressure air or a motor. At the same time, the contact part of the tip of the electrode with the object to be welded is ground by blowing fine hard particles such as grindstone, sand, metal powder, steel balls, etc. on the surface with high-pressure gas, and the surface of the electrode is polished. A method for recycling an electrode for a spot welder, which is characterized by removing the kimono.