JPS6050555B2 - Electrode grinding and shaping device for resistance welding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode grinding and shaping device for spot welding and other resistance welding machines.

A conventional device of this kind, for example, disclosed in Japanese Utility Model Application Publication No. 52-22423, is equipped with an electrode insertion portion in the device body into which a pair of electrodes for a resistance welding machine can be inserted from both sides in the axial direction, and each electrode is inserted into the insertion portion. A rotary blade having blades on both sides in the axial direction along the inclination of the circumferential surface of the tip end, and a catch seat sandwiched between the tip surfaces of the two electrodes are provided, and the two electrodes are left attached to the welding machine. It is known that the closing action pressurizes the insertion part from both sides in the axial direction for grinding and shaping. When the electrode is inserted into the insertion part with a high pressure similar to that used during welding, the periphery of the tip surface of the electrode a is generated as shown in Fig. 1. The blade portion of the rotary blade digs deeply into the curled portion, resulting in failure to start the rotary blade.

Conventionally, the pressure applied to the electrode is reduced during grinding and shaping, but this requires a complex control circuit to increase and decrease the pressure during welding and grinding, which is not only expensive but also erroneous. This is accompanied by the inconvenience of being more likely to cause activation.

In addition, it is actually difficult to accurately position and insert the electrode into the electrode insertion part, so conventionally the main body of the device is floated to absorb misalignment, but the floating mechanism becomes large and complicated. Furthermore, since the entire device body is moved, it is not able to move smoothly following the electrodes, resulting in poor shaping due to poor absorption of misalignment.

SUMMARY OF THE INVENTION In order to eliminate such inconveniences, the present invention aims to provide a device that can prevent core slippage and bite into the curled portion by the radial movement of the rotary blade. The device body is equipped with an electrode insertion part into which a pair of electrodes for a resistance welding machine can be inserted from both sides in the axial direction, and the insertion part has blade parts on both sides in the axial direction along the inclination of the circumferential surface of the tip of each electrode. and a catch seat sandwiched between the tip surfaces of both electrodes, the rotary blades are arranged in at least three pieces radially around and around the catch seat, and the tips of these rotary blades are The separately configured catch is held between the parts, and
It is characterized in that each of the rotary blades is urged toward the catch by a bullet.

Next, the present invention will be explained with reference to the illustrated embodiments. Referring to FIG. 2, A shows a resistance welding machine attached to the tip of the robot A1, B shows a grinding and shaping device mounted on a stand C on the side of the placement position of the robot A1; Install 1
When the pair of electrodes A, a has a curled portion b as shown in the first diagram, the robot A1 operates to move the welding machine A to the positioning part of the shaping device B and grind the electrodes A, a. I decided to do some plastic surgery. The shaping device B, as shown in FIG. 3 and below,
An electrode insertion part 2 into which the electrodes A, a can be freely inserted from both sides in the axial direction is provided at the distal end of the device main body 1 fixed on the stand C, and the distal end of each electrode a is inserted into the insertion part 2. A rotary blade 3 having blade portions 3a, 3a on both sides in the axial direction along the circumferential slope.
and a seat 4 sandwiched between the tip surfaces of the two electrodes A, a. In the illustrated example, the insertion portion 2 is provided with an annular rotating disc 5 having a central through hole. Then, the rotary blade 3 is engaged with the rotary disc 5 so as to be rotated together with the rotary blade 3, and the rotary disc 5 is connected to the rack 7 and the pinion 8 by a cylinder 6 provided on the main body 1, and further one-way. The driven gear 11 is fitted into the recessed part 11a at the center of the driven gear 11, which is engaged with the driving gear 10 which is intermittently rotated through the clutch 9, and engaged with the key. In other words, the rotary blade 3 is rotated integrally with the rotation of the rotary disk 5.

According to the present invention, the rotary blades 3 are arranged in at least three pieces radially around the catch seat 4, and the separately configured catch seat 4 is sandwiched between the tip portions of the rotary blades 3. At the same time, each rotary blade 3 is urged toward the catch seat 4 by a bullet 12, respectively. To explain this in more detail, in the illustrated example, four slits 5a are formed radially in the rotary disk 5, and each rotary blade 3 is slidably inserted into each slit 5a. Four rotary blades 3 are arranged, and each of the rotary blades 3 is urged inward via a contact piece 13 by a spring 12 on the outside in the radial direction. The catch seat 4 is held between the two.

4 Next, to explain its operation, first move the resistance welding machine A to the placement part of the grinding and shaping device B, and insert a pair of electrodes A, a into the electrode insertion part 2 by the closing operation of the welding machine A. In this case, when the curved part b of each electrode a hits the blade part 3a of each rotary blade 3, each rotary blade 3 retreats radially outward against the bullet 12, and thus Even if the electrodes A, a are inserted with a high pressure similar to that used during welding, the blade portion 3a does not bite into the curved portion b. Furthermore, even if the electrodes A and 7a are eccentric with respect to the insertion portion 2, when the electrodes are inserted, each rotary blade 3 moves in the radial direction following the electrodes A and a, and the catch seat 4 It is displaced concentrically with both electrodes A and a and is sandwiched between their tip surfaces, so that misalignment is reliably absorbed. Next, when the rotary disk 5 is rotated, each of the rotary blades 3 rotates around the electrodes, gradually grinding the curled portion b, and hits the catch seat 4 by the biasing force of the bullet 12. Move forward to a position where both electrodes A,
Grinding and shaping of a is performed.

As described above, according to the present invention, a catch is sandwiched between the tips of at least three rotary blades arranged radially, and each of the rotary blades is biased toward the catch by a bullet. Even if a pair of electrodes provided in a resistance welding machine are inserted with a high pressure similar to that used during welding, each rotating blade will retreat against the bullet, causing the blade part to reach the curled part of the electrode. There is no digging, and the misalignment of the electrodes is absorbed by the movement of each rotary blade that follows the electrodes, eliminating the need for floating the device body, which has the effect of reliably resolving the above-mentioned inconveniences of conventional devices. has.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the state of the electrode before grinding and shaping, FIG. 2 is a side view showing the arrangement of the resistance welding machine and the device of the present invention, and FIG.
The figure is a plan view of one example of the device of the present invention, and FIG. 4 is the - of FIG. 3.
(2) A side view taken along the line, FIG. 5 is a plan view taken along the line V--V in FIG. A... Resistance welding machine, B... Grinding and shaping device, a... Electrode, 1... Device body, 2.
...Electrode insertion part, 3...Rotary blade, 3a...
...Blade, 4...Catch, 12...Bunch.

Claims (1)

[Claims] 1 The device body is equipped with an electrode insertion part into which a pair of electrodes for a resistance welding machine can be inserted from both sides in the axial direction, and the insertion part has blades on both sides in the axial direction along the inclination of the circumferential surface of the tip of each electrode. and a catch seat sandwiched between the tip surfaces of the two electrodes, the rotary blades are arranged in at least three pieces radially around the catch seat, and the tips of these rotary blades are An electrode grinding and shaping device for a resistance welding machine, characterized in that the separate catch seat is held between the parts, and each rotary blade is biased toward the catch seat by a bullet.