JPH01273679A - Device for forming electrode tip - Google Patents

Abstract

PURPOSE:To improve forming efficiency by providing a supporting mechanism which acts radially to the inside of a cylindrical member to support cutters and connecting a turning mechanism to the cutters. CONSTITUTION:The cutters 3 divided to a plurality are disposed in the cylindrical member 1 and cutting edges 3a are provided to the front and rear surfaces around the central holes. Grooves for urethane rubber pins 2 and stopper rings 8 are formed at 4 points to the internal circular peripheral face of the cylindrical member 1. The cutters 3 hold the supporting mechanism 5 and are held by the pins 2, guides 7 and the rings 8. The front ends of tips press the cutting edges 3a when this device is inserted between electrodes attached with the tips having the worn front ends and is pressurized. The cutters 3 are then radially opened. The cutting edges 3a cut the front ends of the tips to a prescribed shape when the turning mechanism 4 of the cutters 3 are turned. The forming of the tips is executed while the tips are held mounted to a welding machine. Centering is automatically executed. The efficiency of forming the tips is, therefore, improved.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a forming apparatus for resistance welding electrode tips.

(Conventional technology) A typical resistance welding electrode tip is dome-shaped and trapezoidal.

is the main problem, and as welding continues, the surface area of the tip increases, resulting in a decline in welding quality.

Conventionally, the chips were removed and molded using a special machine, or an air-type cutter was used to attach the chips.

(Problems to be Solved by the Invention) However, the removal method is time-consuming, and the air cutter method requires skill.

It is known that a V/Bell electrode with a protrusion on the tip end can produce high-quality welding and have a long tip life if the center alignment of the lower L tip is good.

The object of the present invention is to provide a device that can be attached to a welding machine to form a vimpel shape that can accurately align the cores in a short time.

(Means for Solving the Problems) The present invention will be explained with reference to FIGS. 1 and 2, which correspond to embodiments. 3 and rotation t1!41 of the cutter 3
14 and support for the electrode tip to be cut! 1! This is an electrode chip molding apparatus composed of Structure 5.

(For ft) If the device of the present invention is held and pressurized between the upper and lower electrode tips of a welding machine with a tip that has become worn and has a large tip diameter, the cutter 3, which is composed of four parts, can be divided into four parts. A hollow urethane rubber bottle 2 attached to the outer periphery of the bottle is crushed and opened in the radial direction of the axis.

The electrode chip that is further pressurized is chip support 1fitf1
Supported by 5.

If the cutter 3 is rotated by the rotation mechanism 4, the chip is cut into a predetermined shape.

(One practical example) The example shown in Figs. 1 and 2 is an example in which the cutter is rotated manually. 1 is a cylindrical member, and urethane rubber bottles 2 are placed in key-like positions at four locations on the circumference. It has a groove for the stopper ring 8 and a groove for the stopper ring 8.

3 is a cutter divided into four parts, and a hole approximately the welding diameter is formed in the center. A cutting blade 3a having a low slope in the center is attached to the front and back surfaces around the hole. The inner peripheral surface of the hole has a hole for holding the chip support fii5, and the outer peripheral surface has a hole into which the urethane rubber bottle 2 is inserted in a key shape.

The cutter 3 holds a chip support mechanism 5 in the center,
It is held by a slightly crushed urethane rubber bottle 2, a guide 7, and a stopper ring 8.

When the forming device configured as described above is placed between the electrodes of a welding machine with a worn tip and pressurized, the tip of the tip comes into contact with the slanted cutting edge 3a of the cutter 3 and presses it. In order to do this, the cutter 3 crushes the urethane rubber bottle 2 and opens it in the radial direction of the axis.

If the cutter rotating mechanism tf14 is rotated, the urethane rubber bottle 2 will move like a key, and the cutter 3 will rotate.
The cutting edge 3a cuts the tip end into a predetermined shape.

Once molding is complete, release the pressure and remove the device.

(Effects of the Invention) As described above, the present invention is composed of a cylindrical member, a cutter that moves in the radial direction of the axis within the cylindrical member, a rotation mechanism for the cutter, and a support mechanism for the electrode tip to be cut. As a result, the electrode tip can be molded under the same pressure conditions as welding while attached to the welding machine, which not only saves time and effort, but also allows for center alignment to be performed automatically. Therefore, the welding robot can be kept in a normal state at all times, and one high-quality welded product can be ensured.

In addition, by providing an 8S ellipse to support the electrode, not only can forming be performed without applying excessive force to the cutter, but even if the welding machine itself bends due to pressure, the forming can be done naturally and reliably. It also has the effect of

Furthermore, if the cutter and support mechanism are insulated, there is an effect that the ':rL pole chia tip can be safely performed even when the welding machine is in operation.

[Brief explanation of the drawing]

The first figure is a longitudinal cross-sectional view of one embodiment of the device of the present invention, the second figure is a view corresponding to the cross-sectional view taken along the line A-A in the first figure, 1... Cylindrical member, 2
・・Urethane rubber bottle 3・・Cutter, 4・・Rotating mechanism, 5・・Support mechanism, 7・・Guide, 8・・Stop ring

Claims (1)

[Claims] An electrode tip comprising a cylindrical member, a cutter supported within the member by a support mechanism that moves in the radial direction of an axis, a rotation mechanism for the cutter, and a support mechanism for the electrode tip to be cut. molding equipment.