JPS6232708Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an automatic welding electrode polishing device.

When the welding electrodes (tips) used in spot welding robots wear out, they need to be polished.
Conventionally, a configuration was generally adopted in which a robot moves and stops the welding electrode above a polisher (auto dresser), and then the polisher rises and automatically polishes the underside of the welding electrode (for example, (Refer to Utility Model Application Publication No. 106728/1983).

For this reason, high accuracy is required for the robot to control the stop position of the welding electrode, but if the stop position is incorrect or the welding electrode itself is bent, the axis of the welding electrode and the polishing means of the polishing machine may be There was a problem that polishing could not be performed because the two did not match.

The present invention has been made in view of the above-mentioned conventional problems.Basically, a dresser body having a polishing means is provided so as to be movable forward and backward and pivotable, and the shaft of the polisher is located near the polishing means of the dresser body. A guide member is provided to rotate the dresser body so that its center coincides with the axis of the welding electrode, and the dresser body is rotated while moving forward with respect to the welding electrode stopped at a predetermined position, so that the axis is aligned. The present invention provides a new automatic welding electrode polishing device that starts polishing when the welding electrode is stopped, thereby making it possible to polish accurately and reliably even when the stop position of the welding electrode varies or the welding electrode is bent. be.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 4, the welding electrode automatic polishing device consists of a rear substrate 1, a front substrate 2, and both side substrates 3, 3.
It has a base 4 formed in the shape of a rectangular frame, and the base 4 is supported by a pair of lifting guide rods 6, 6 attached to fixed brackets 5, . , is connected to a piston rod 8 of an elevating cylinder 7, and is moved up and down by the elevating cylinder 7.

At the lower position of the base 4, a pair of reciprocating guide rods 9, 9 on both sides of the rear board 1 and the front board 2
The forward and backward movement guide rods 9, 9
As a result, the leg blocks 11, 11 of the dresser body 10 disposed at the middle position of the base 4 are fitted and supported so as to be movable forward and backward, so that the dresser body 10 can be moved forward and backward within a horizontal plane.

Leg blocks 11, 11 of the dresser main body 10
A holder block 12 fixed between the two supports a motor 14 of a polishing machine 13 rotatably in a vertical position via a bearing 15.

At the top of the motor 14, a dresser board 17 is provided which is rotatable in both directions around the motor shaft center along with the motor 14 supported by a bearing 15.
A front part (swivel part) of the dresser board 17 is provided.
is provided with a polishing blade 19 for polishing the lower surface of the welding electrode 18, and the polishing blade 19 is connected to the output shaft 16 of the motor 14 by a gear train (not shown), and the polishing blade 19 is rotated by the rotation of the motor 14. It becomes like this.

A pair of arms 20, 20 extending to both sides are fixed to both ends of the dresser board 17, and the rear part is fixed to brackets 21, 21 fixed to both sides of the rear surface of the rear board 1, with pins 22, 22 in a horizontal plane. The notches 1a, 1 of the rear substrate 1
A pair of cylinders 23 and 23 are provided,
The piston rods 24, 2 of the cylinders 23, 23
4 is connected to the arms 20, 20 by pins 25, 25, and the dresser body 10 (dresser board 17, motor 14, etc.) is moved forward and backward along the forward and backward movement guide rods 9, 9 by the cylinders 23, 23.

The cylinders 23, 23, the pins 22, 22 of the brackets 21, 21 of the rear board 1, and the arms 20, 2
0 pins 25, 25 constitute a parallelogram link, so when the dresser board 17 rotates together with the motor 14 around the motor axis, the cylinders 23, 23 follow it and rotate in parallel. ing.

A guide member 26 having a substantially V-shaped guide surface that expands in the forward direction is fixed to the upper part of the dresser base plate 17 of the dresser main body 10, and when the dresser main body 10 moves forward, the guide member 26 The dresser body 10 is rotated around the motor axis so that the polishing blade 19 comes into contact with the welding electrode 18 and the axis of the polishing blade 19 coincides with the axis of the welding electrode 18.

Proximity switches 27, 27 serving as sensors are provided on both sides of the guide surface of the guide member 26, and when the proximity switches 27, 27 detect that the axes of the polishing blade 19 and the welding electrode 18 coincide, the cylinder 23 , 23 is provided.

Further, a pair of pillars 29, 29 protruding forward is provided at the upper position of the rear board 1, and the pillars 29, 29 are
Nozzles 30 and 30 for blowing air toward the polishing blade 19 are provided at the tips of the polishing blades 9 and 29 to blow off chips generated by polishing.

The operation of the automatic polishing apparatus configured as described above will be explained next.

The robot stops the welding electrode 18 at a predetermined position. This stop position may be within a range in which the polishing blade 19 can move forward and backward and rotate, and high accuracy is not required.

The dresser body 10 is moved straight forward by the simultaneous operation of the cylinders 23 and 23, and the guide member 26
When the guide surface contacts the outer peripheral surface of the welding electrode 18 at the stop position, the guide member 26 causes the dresser body 10 to align the motor axis so that the axis of the polishing blade 19 coincides with the axis of the welding electrode 18. being swiveled to,
Following this, the cylinders 23, 23 are also turned in parallel.

The polishing blade 1 is operated by the proximity switch 27 of the guide member 26.
When it is detected that the axes of the welding electrode 9 and the welding electrode 18 match, the control device 28 locks the cylinders 23, 23.

Next, the base 4 is raised by the lifting cylinder 7, and the welding electrode 108 is polished by the polishing blade 19 rotated by the motor 14.

In the above embodiment, the welding electrode facing downward is polished, but if the guide member 26 is provided on the lower surface of the dresser substrate 17, it can also be applied to polishing the welding electrode facing upward.

Further, although a proximity switch is used as the sensor in the above embodiment, it goes without saying that the sensor is not limited to this and other detection switches may be used.

As is clear from the above explanation, the present invention
The rotatable dresser body is advanced by a pair of cylinders, the guide member is brought into contact with the welding electrode stopped at a predetermined position, the dresser body is rotated so that the axes of the polishing means and the welding electrode coincide, and the axes of the welding electrode are aligned. Since the polishing means starts polishing the welding electrode when the welding electrodes match, it is possible to always polish the welding electrode accurately and reliably even if the stop position of the welding electrode varies or the welding electrode is bent. can.

[Brief explanation of the drawing]

1 is a perspective view schematically showing an automatic polishing device, FIG. 2 is a front view of the automatic polishing device, FIG. 3 is a plan view of FIG. 2, and FIG. 4 is a side view of FIG. 2. 4... Base, 7... Lifting cylinder, 9... Advance/retreat guide rod, 10... Dresser body, 13...
... Polishing machine, 14 ... Motor, 17 ... Dresser board, 18 ... Welding electrode, 19 ... Polishing blade, 23 ...
... cylinder, 26 ... guide member, 27 ... proximity switch, 28 ... control device.

Claims (1)

[Claims for Utility Model Registration] A device for automatically polishing welding electrodes used in spot welding at predetermined positions, which is supported by a base so that it can move forward and backward in a horizontal plane and can rotate, and the above-mentioned welding electrode is attached to the rotating part. A dresser body provided with a polishing means for polishing the end face of the electrode, and a pair of dressers on both sides of the dresser body, one end of which is connected to a base and the other end of which is connected to the dresser body, for moving the dresser body forward and backward and rotating the dresser body. and a substantially V-shaped guide surface that is provided near the polishing means of the dresser main body and widens in the forward direction, and when the dresser main body moves forward, it comes into contact with the welding electrode and the polishing means When the alignment of the axes of the polishing means and the welding electrode is detected by a guide member that rotates the dresser main body so that the axis coincides with the axis of the welding electrode, and a sensor provided on the guide member,
An automatic welding electrode polishing device comprising: control means for locking the cylinder.