JPH07155969A - Electrode chip polishing device - Google Patents

Abstract

PURPOSE:To provide an electrode chip polishing device which can easily and uniformly polish the electrode chip of spot welding machine. CONSTITUTION:The device has a circular disk-like polishing body 21 whose one side, at least, forms a polishing surface 23 curving to the inner side and which is made freely rotating, and a rotary body 33 which forms a chip inserting hole 37 in order to insert the top of an electrode chip and to abuts it on the polishing surface 23 at the position separated from the rotary center 36 and which is arranged at the polishing surface side freely rotating so that its rotary center 36 comes on an extending line of the rotary center 24 of the polishing body. Further, it has a driving motor 63 which separately rotates the polishing body 21 and the rotary body 33, and a holding part 71 for gripping or holding the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for polishing electrode tips of a spot welding machine.

[0002]

2. Description of the Related Art Conventionally, as a device for polishing the above-mentioned electrode tip, there has been known an apparatus for bringing a rotating cutter blade into contact with the tip of the electrode tip to grind the outer surface of the electrode tip. However, in the conventional polishing (grinding) device, the outer surface of the electrode tip is scraped off with a cutter blade, so the correction allowance is large and smooth and uniform polishing is not possible. There is a difficult problem to solve. Furthermore, the cutter blade may bite into the outer surface of the electrode tip and be chipped, and in that case, the cutter blade must be replaced.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention is intended to provide an electrode tip polishing apparatus which can easily and uniformly and smoothly polish the outer surface of the tip of an electrode tip of a spot welding machine and is excellent in durability. It is a thing.

[0004]

SUMMARY OF THE INVENTION The present invention is an apparatus for abrading a rotating polishing body against the tip of an electrode tip of a spot welding machine to polish the electrode tip, the polishing being curved inward on at least one side. A disk-shaped polishing body having a surface formed thereon and being rotatable, and a tip insertion hole for inserting the tip of the electrode tip into contact with the polishing surface of the polishing body are formed at positions apart from the center of rotation. A rotary body rotatably arranged on the polishing surface side so that the center of rotation is on an extension of the center of rotation of the polishing body; a drive motor for separately rotating the polishing body and the rotary body; A polishing device for an electrode chip, comprising: a holding part for gripping or holding.

[0005]

In this polishing apparatus, the holding portion is used while being held by the operator's hand or held by the robot or the like. Then, the polishing body and the rotating body of the polishing apparatus respectively rotate. However, since the insert body has a tip insertion hole formed at a position distant from the center of rotation, the tip insertion hole causes a circular motion having a predetermined radius from the center of rotation of the body of rotation, that is, the center of rotation of the polishing body. To do. This means that when viewed from the electrode tip inserted in the tip insertion hole of the rotating body, the rotating polishing body revolves around the outer periphery of the electrode tip while contacting the outer peripheral surface of the electrode tip. Therefore, the outer peripheral surface of the electrode tip is evenly contacted with the polishing surface and is uniformly polished.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a side view of a polishing apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of a main part thereof, FIG. 3 is a sectional view taken along line 3-3, and FIG. 4 is a rear view thereof. The lower case is removed from FIGS. 3 and 4.

The polishing apparatus 10 of this embodiment has a main body 1
1, a drive unit 61 and a holding unit 71. The main body 1
Reference numeral 1 denotes a substrate 13 to which a polishing body 21, a rotating body 33 and the like are attached. The substrate 13 is made of a long metal plate-like body, and has a circular opening window 15 formed at its front portion and penetrating between the upper and lower surfaces thereof, and has a rotary shaft insertion hole 17 of a drive motor at its rear portion.
Are formed. In addition, the upper surface 14 of the substrate 13 is formed low except for the peripheral edge. In this embodiment, as shown in FIG. 1, a lower case 12 is attached to the lower surface of the substrate 13 to cover the outer circumferences of a rotating body 33 and a gear mechanism 45, which will be described later.

In the opening window 15 of the substrate 13, the polishing body 2
1 is rotatably mounted via a bearing 25. The polishing body 21 has a disk-shaped outer shape, and
At least the lower side thereof is curved inward to form the polishing surface 23, which is also referred to as a grindstone. A diamond electrodeposition layer is provided on the polishing surface 23 of this embodiment, and a plurality of polishing waste discharge holes 26 are formed in the polishing surface 23.
A pulley 27 is fitted on the outer circumference of the upper part of the polishing body 21, and a bearing 29 for the rotating body 33 is fitted on the outer circumference of the lower part. A belt 43, which serves as a rotation transmission means, is hung between the pulley 27 and a drive pulley 41, which will be described later. On the other hand, the rotating body 3 is attached to the outer peripheral frame 31 of the bearing 29.
3 is attached. Reference numeral 35 is a screw for mounting the same.

The rotating body 33 is composed of a helical gear having teeth 34 formed on the outer periphery thereof, and a chip insertion hole 37 is formed at a position apart from a rotation center 36 thereof so as to penetrate the upper and lower surfaces of the rotating body 33. Has been done. The tip insertion hole 37 is for inserting an electrode tip, and as shown in FIG.
5 is preferably provided so that the outer peripheral surface thereof abuts on the edge of the polishing surface 23. The rotating body 33 is rotatably attached to the lower side of the polishing body 21 via the bearing 29 so that the rotation center 36 is an extension of the rotation center 24 of the polishing body 21.

The rotary body 33 is connected to a rotary shaft 65 of a drive motor 63 via a gear mechanism 45 as a rotation transmitting means provided on the lower side of the substrate 13, and the rotary shaft 65 rotates. It is designed to rotate. The gear mechanism 45 reduces the rotation speed of the drive motor 63 to a predetermined rotation speed and transmits it to the rotating body 33. In this embodiment, the gears provided on the three parallel shafts 46, 47, 48 are The rotation of the rotating shaft 65 is transmitted to the rotating body 33 while being decelerated therethrough. The rotation speed of the rotating body 33 is set to a desired speed, but in this embodiment, it is set to about 20 times / minute. Reference numeral 49 in the drawing denotes a worm wheel fixed to the shaft 46, which meshes with a worm gear 66 fixed to the rotary shaft 65 of the drive motor. A gear 50 fixed to the shaft 46 meshes with a gear 51 fixed to the shaft 47, and the gear 51 meshes with a gear 52 of the shaft 48. A gear 53 that meshes with the teeth 34 on the outer circumference of the rotating body 33 is fixed to the shaft 48.

The drive unit 61 is for rotating the polishing body 21 and the rotating body 33, and is provided with a drive motor 63. The drive motor 63 is composed of a motor that rotates with air, a motor that rotates with electricity, or the like. In this embodiment, the drive motor 63 is covered with a cylindrical case, and the rear portion of the case serves as a holding portion 71. The rotary shaft 65 of the drive motor 63 has the substrate 13
It is inserted into the rotary shaft insertion hole 17 and is fixed to the upper surface 14 of the substrate 13. The drive pulley 41 is fitted to the rotating shaft 65 on the upper surface side of the substrate 13, and the worm gear 66 is fitted to the lower surface side of the substrate 13. The drive pulley 41 includes a belt 43 between the drive pulley 41 and the pulley 27 on the outer periphery of the polishing body 21.
While the worm gear 66 meshes with the worm wheel 49 of the gear mechanism.

A holding portion 71 is a portion where an operator holds the device or a robot or the like holds the device. In this embodiment, as described above, the case rear portion of the drive unit 61 is directly used as the holding unit 71, and the holding unit 71 is gripped by the worker. Of course, the holding portion 71 is not limited to the grip shape as in this embodiment, but may be a shape that is fixed to a machine arm or the like with a bolt or the like. 72 is a connector for connecting the device 10 to an air source or a power source.

Electrode tip polishing apparatus 1 thus constructed
As shown in FIG. 3, 0 indicates a state in which the tip of the electrode tip 75 fitted to the fixed rod-shaped body 73 is inserted into the tip insertion hole 37 of the rotating body 33 and is in contact with the polishing surface 23 of the polishing body 21. Then, the rotary shaft 65 of the drive motor 63 is rotated. The rotation speed of the rotating shaft 65 is 14000 to 160 in this embodiment.
It is set to about 00 revolutions / minute.

Then, the drive pulley 41 is rotated by the rotation of the rotary shaft 65 of the drive motor, and the rotation is caused by the rotation of the belt 43.
Is transmitted to the pulley 27 on the outer periphery of the polishing body through the
At the same time, the polishing body 21 rotates at high speed. As a result, the outer surface of the electrode tip 75 that contacts the polishing surface 23 of the polishing body is polished. At the same time, the rotation of the rotary shaft 65 of the drive motor is transmitted from the worm gear 66 to the rotary body 33 via the gear mechanism 45, and the rotary body 33 rotates at a low speed.
At that time, the tip insertion hole 37 located at a position away from the rotation center 36 of the rotating body 33 makes a circular motion having a predetermined radius from the rotation center 36. As described in the section of the above-mentioned action, when viewed centering on the electrode tip 75 inserted into the tip insertion hole 37, the polishing body 21 rotates the outer periphery of the electrode tip 75 while contacting the outer peripheral surface of the electrode tip 75. Therefore, the outer peripheral surface of the electrode tip 75 is evenly and uniformly polished.

In this embodiment, the rotation of the drive motor is transmitted to the polishing body 21 via the belt 43.
It may be a gear, a chain or the like. When using a chain, a sprocket is used instead of the pulley 27.

[0016]

As shown and described above, according to the polishing apparatus of the present invention, the operator simply and uniformly holds the holding portion and inserts the tip of the electrode tip into the tip insertion hole. Smooth polishing can be performed, and it is not necessary to move the device circularly. Further, the holding unit may be attached to a robot or the like, in which case there is an effect that the mechanism of the robot or the like can be simplified. Furthermore, there is no fear that the polishing body will be damaged during polishing, and there is an effect of excellent durability.

[Brief description of drawings]

FIG. 1 is a side view of an electrode tip polishing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of a main part of the apparatus.

3 is a sectional view of the device taken along line 3-3 in FIG.

FIG. 4 is a back view of the device.

[Explanation of symbols]

 21 polishing body 23 polishing surface 24 rotation center of polishing body 27 pulley 33 rotation body 36 rotation center of rotation body 37 chip insertion hole 41 drive pulley 43 belt 45 gear mechanism 63 drive motor 65 rotation shaft 71 holding portion

Claims (2)

[Claims] 1. An apparatus for polishing an electrode tip by bringing a rotating polishing body into contact with the tip of an electrode tip of a spot welding machine, wherein an inwardly curved polishing surface is formed on at least one side so as to be rotatable. And a disk-shaped polishing body, and a tip insertion hole for inserting the tip of the electrode tip into contact with the polishing surface of the polishing body is formed at a position apart from the rotation center, and the rotation center of the polishing body is A rotating body rotatably arranged on the polishing surface side so as to be on an extension line of the rotation center, a drive motor for separately rotating the polishing body and the rotating body, and a holding portion for gripping or holding the apparatus. An electrode tip polishing apparatus, comprising: 2. The polishing body according to claim 1, wherein the polishing body is connected to a rotation shaft of a drive motor by a rotation transmission means such as a belt,
While rotating at the same speed as the rotation speed of the drive motor, the rotating body is connected to the rotation shaft of the drive motor by rotation transmission means such as a gear mechanism to reduce the rotation speed of the drive motor. A polishing device for an electrode tip, characterized in that it is adapted to rotate.