JP2019150838A - Electrode polishing device, welding device including electrode polishing device, and electrode polishing method - Google Patents

Abstract

To polish surely a tip of a bar-shaped electrode having deposit adhering thereto.SOLUTION: An electrode polishing device for polishing a tip of a first bar-shaped electrode 51 the tip of which has a convex curved surface shape includes a first polishing mechanism 1 having a recess 11a, for polishing the tip of the first bar-shaped electrode 51 inserted into the recess 11a, and a rolling mechanism for rotating the first polishing mechanism 1 around a rotational axis L1 passing through the deepest position of the recess 11a. A position of the rotational axis L1 is a position shifted from a position of a central axis L2 of the first bar-shaped electrode 51.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an electrode polishing apparatus for polishing a rod-shaped electrode, a welding apparatus equipped with an electrode polishing apparatus, and an electrode polishing method.

  In electrical resistance welding such as spot welding, as shown in FIG. 9A, a material to be welded 91 is sandwiched and pressed between a pair of rod-shaped electrodes 92 and 93, and an electric current is passed between the pair of rod-shaped electrodes 92 and 93. The welded material 91 is welded.

  As shown in FIG. 9B, the rod-shaped electrodes 92 and 93 used for welding may be attached with a deposit 94 such as an oxide by welding. If welding is performed with the deposit 94 attached to the rod-shaped electrodes 92, 93, welding failure may occur. Since this weld failure is likely to occur when deposits accumulate, it is important to remove the deposit 94 by polishing the tip portions of the rod-shaped electrodes 92 and 93.

  In FIG. 5 of Patent Document 1, a rod-shaped electrode is obtained by rotating the blade portion in a state where the tip portion of the rod-shaped electrode having a convex curved surface shape is inserted into the blade portion having a concave arc shape. The apparatus which grind | polishes the front-end | tip part of is described. The blade portion is configured to rotate around a rotation axis that passes through the concave deepest position, and by rotating the blade portion with the rotation axis and the center axis of the rod electrode aligned, Polish.

Japanese Patent Laid-Open No. 2003-24579

  However, in the conventional polishing apparatus having the above-described configuration, a portion of the blade portion that is located on the rotation shaft does not rotate, which causes a problem that the tip portion of the rod-like electrode to which the deposits adhere is difficult to be polished.

  The present invention solves the above-mentioned problems, and an electrode polishing apparatus capable of effectively polishing the tip of a rod-shaped electrode, a welding apparatus equipped with such an electrode polishing device, and the tip of a rod-shaped electrode An object of the present invention is to provide an electrode polishing method that can effectively polish the film.

The electrode polishing apparatus of the present invention is
An electrode polishing apparatus for polishing the tip of the first rod-shaped electrode having a convex curved surface at the tip,
A first polishing mechanism having a recess and polishing the tip of the first rod-shaped electrode inserted into the recess;
A rotation mechanism that rotates the first polishing mechanism around a rotation axis that passes through the deepest position of the recess;
With
The position of the rotating shaft is at a position deviated from the position of the central axis of the first rod-like electrode.

The first polishing mechanism is configured to polish the tip portion of the first rod-shaped electrode by rotating in a state where the tip portion of the first rod-shaped electrode is in contact with the concave portion via a sheet-like abrasive. Configured,
You may further provide the contact position change mechanism which changes the contact position of the said 1st rod-shaped electrode and the said abrasive | polishing material.

  The contact position changing mechanism may be configured to move the abrasive material in order to change the contact position between the first rod-shaped electrode and the abrasive material.

The abrasive has a long shape,
The contact position changing mechanism is:
An unwinding section for unwinding the abrasive in a rolled state;
A winding unit that winds up the abrasive unwound from the unwinding unit;
May be provided.

  The contact position changing mechanism may be configured to move the abrasive when the polishing of the first rod-shaped electrode by the first polishing mechanism is completed.

A second polishing mechanism for polishing the tip of the second rod-shaped electrode, the tip of which has a planar shape and is welded in pairs with the first rod-shaped electrode;
A drive mechanism for driving the second polishing mechanism;
With
The second polishing mechanism has a flat portion, and is driven by the driving mechanism in a state where the tip portion of the second rod-shaped electrode is pressed against the flat portion via a sheet-like abrasive, The tip of the second rod-shaped electrode may be configured to be polished.

The drive mechanism is
A second rotating mechanism for rotating the second polishing mechanism;
A linear movement mechanism for linearly moving the second polishing mechanism;
May be provided.

Welding equipment
The electrode polishing apparatus described above;
The first rod-shaped electrode;
The second rod-shaped electrode;
It is characterized by providing.

The electrode polishing method according to the present invention comprises:
The tip of the rod-shaped electrode is polished by rotating the polishing mechanism in a state where the tip of the rod-shaped electrode having a convex curved surface is inserted into the recess of the polishing mechanism provided with the recess. An electrode polishing method that comprises:
Adjusting the position of the polishing mechanism and the rod-shaped electrode so that the position of the rotation axis passing through the deepest position of the recess is shifted from the position of the central axis of the rod-shaped electrode;
After adjusting the position of the polishing mechanism and the rod-shaped electrode, the step of rotating the polishing mechanism around the rotation axis in a state where the tip of the rod-shaped electrode is inserted into the recess of the polishing mechanism;
It is characterized by providing.

According to the electrode polishing apparatus of the present invention, the position of the rotating shaft when rotating the first polishing mechanism is shifted from the position of the central axis of the first rod-shaped electrode, so the concave portion of the rotating first polishing mechanism Thus, the tip of the first rod-like electrode can be polished reliably.
Moreover, according to the welding apparatus provided with such an electrode grinding | polishing apparatus, the front-end | tip part of the 1st rod-shaped electrode used for welding can be grind | polished reliably.

  Further, according to the electrode polishing method of the present invention, the position of the rotating shaft when rotating the polishing mechanism is deviated from the position of the central axis of the rod-shaped electrode. The tip can be reliably polished.

It is a perspective view which shows the structure of the electrode polishing apparatus in 1st Embodiment. It is an enlarged view of the principal part of an electrode polishing apparatus. It is a side view of the principal part of an electrode polishing apparatus. It is a side surface schematic diagram of a 1st grinding | polishing mechanism. It is a perspective view of the 1st metal part provided in the 1st polish mechanism. It is a figure for demonstrating the method of grind | polishing a 1st rod-shaped electrode. It is a side surface schematic diagram of the 2nd grinding | polishing mechanism which grind | polishes a 2nd rod-shaped electrode. It is a figure for demonstrating the method of grind | polishing a 2nd rod-shaped electrode. It is a figure for demonstrating the method of welding a to-be-welded material with a pair of rod-shaped electrode.

  Embodiments of the present invention will be described below, and the features of the present invention will be described more specifically.

<First Embodiment>
FIG. 1 is a perspective view showing a configuration of an electrode polishing apparatus 100 according to the first embodiment. FIG. 2 is an enlarged view of a main part of the electrode polishing apparatus 100. FIG. 3 is a side view of the main part of the electrode polishing apparatus 100.

  In the electrode polishing apparatus 100 according to the first embodiment, the first polishing mechanism 1, the first rotating mechanism 2 that rotates the first polishing mechanism, the first rod-shaped electrode that will be described later, and the abrasive material that will be described later are in contact positions. And a contact position changing mechanism 3 to be changed.

  The first polishing mechanism 1, the first rotating mechanism 2, and the contact position changing mechanism 3 are configured to be movable in the X-axis direction along the X-axis direction rail 4 extended in the X-axis direction, and Y It is configured to be movable in the Y-axis direction along the Y-axis direction rail 5 extending in the axial direction. Since the first polishing mechanism 1 is configured to be movable in the X-axis direction and the Y-axis direction, the positional relationship with the first rod-shaped electrode described later can be adjusted.

  As shown in FIG. 3, the electrode polishing apparatus 100 includes a motor 31, a cylinder 32, a pusher 33, a winding unit 34, an unwinding unit 35, a pulley 36, and a belt 37. Among the above configurations, the motor 31, the pulley 36, and the belt 37 constitute the first rotation mechanism 2. Further, in the above configuration, the cylinder 32, the pusher 33, the winding unit 34, and the unwinding unit 35 constitute the contact position changing mechanism 3.

  The 1st grinding | polishing mechanism 1 grind | polishes the front-end | tip part of the 1st rod-shaped electrode 51 of a pair of rod-shaped electrodes used for electrical resistance welding with the method mentioned later. The tip of the first rod-like electrode 51 has a convex curved surface shape.

  The first rotating mechanism 2 rotates the first polishing mechanism 1 when the first rod-shaped electrode 51 is polished. Specifically, the motor 31 rotates to drive the pulley 36 and the belt 37 to rotate the first polishing mechanism 1.

  FIG. 4 is a schematic side view of the first polishing mechanism 1. FIG. 5 is a perspective view of the first metal part 11 provided in the first polishing mechanism 1.

  As shown in FIGS. 4 and 5, the first metal part 11 has a recess 11a. The concave portion 11 a is provided on the surface with which the first rod-shaped electrode 51 abuts, here, the upper surface of the first metal portion 11. For example, the cross-sectional shape of the tip of the first rod-shaped electrode 51 and the cross-sectional shape of the recess 11a are both arc-shaped, and the diameter of the recess 11a is about twice the diameter of the tip of the first rod-shaped electrode 51. can do.

  In the present embodiment, as shown in FIG. 5, the recess 11a has a groove shape extending in one direction. However, the shape of the recess 11a is not limited to the groove shape, and may be a shape according to the shape of the tip of the first rod-shaped electrode 51, for example.

  The sandpaper 12 that is a sheet-like abrasive is disposed so as to cover the upper surface of the first metal part 11 that is the surface with which the first rod-shaped electrode 51 abuts. One end of the long sandpaper 12 is fixed to the unwinding portion 35, and the other end is fixed to the winding portion 34.

  When the first rod-shaped electrode 51 is polished, the tip portion of the first rod-shaped electrode 51 is inserted into the recess 11 a of the first metal portion 11. That is, polishing is performed with the tip of the first rod-shaped electrode 51 in contact with the recess 11 a via the sandpaper 12. Since the first metal portion 11 has the recess 11a, the tip portion can be polished while maintaining the shape of the tip portion of the first rod-shaped electrode 51, that is, the convex curved shape.

  The first polishing mechanism 1 is configured to be rotatable about a rotation axis passing through the deepest position of the recess 11 a of the first metal part 11 by the first rotation mechanism 2. The detailed configuration of the first rotation mechanism 2 will be described later.

  FIG. 6 is a diagram for explaining a method of polishing the first rod-shaped electrode 51. As described above, the rotation axis L <b> 1 when rotating the first polishing mechanism 1 is at a position passing through the deepest position of the recess 11 a of the first metal portion 11.

  At the time of polishing the first rod-shaped electrode 51, the position of the rotation axis L1 is shifted from the position of the central axis L2 of the first rod-shaped electrode 51 as shown in FIG. 6A. That is, when the first rod-shaped electrode 51 is polished, the first polishing mechanism 1 and the first rod-shaped electrode 51 are arranged such that the position of the rotation axis L1 and the position of the central axis L2 of the first rod-shaped electrode 51 are shifted. The positional relationship is adjusted.

  As described above, the recess 11a has a groove shape extending in one direction. The position of the rotation axis L1 is shifted from the central axis L2 of the first rod-shaped electrode 51 in a direction different from the direction in which the groove-like recess 11a extends, more specifically, the recess 11a extends. It is in a position shifted in a direction perpendicular to the direction in which it is.

  At the time of polishing the first rod-shaped electrode 51, the distal end portion of the first rod-shaped electrode 51 is inserted into the recess 11 a of the first metal portion 11. That is, in a state where the rotation axis L1 and the central axis L2 of the first rod-shaped electrode 51 are shifted, the first rod-shaped electrode 51 is moved downward and the first rod-shaped electrode 51 is moved via the sandpaper 12. The tip is inserted into the recess 11a of the first metal part 11 and brought into contact therewith. In this state, the first polishing mechanism 1 is rotated around the rotation axis L1 by the first rotation mechanism 2 (see FIG. 6B).

  As described above, the position of the rotation axis L1 when the first polishing mechanism 1 rotates is at a position deviated from the position of the central axis L2 of the first rod-shaped electrode 51. Therefore, the tip of the first rod-shaped electrode 51 is in contact with a position that is not the deepest position of the recess 11 a of the first metal part 11 via the sandpaper 12. Since the position where the tip of the first rod-shaped electrode 51 abuts is a position that rotates when the first polishing mechanism 1 rotates, the tip of the first rod-shaped electrode 51 to which deposits such as oxide adhere by welding is used. It can polish reliably.

  Further, since polishing is performed in a state where the position of the rotation axis L1 and the position of the central axis L2 of the first rod-shaped electrode 51 are shifted, the tip (vertex) of the first rod-shaped electrode 51 after polishing is shifted from the central axis L2. It becomes the position. Therefore, when welding is performed using a pair of rod-shaped electrodes including the first rod-shaped electrode 51, the position where the tip of the first rod-shaped electrode 51 comes into contact with the second rod-shaped electrode which is the other rod-shaped electrode changes, so that the second The position where deposits such as oxides adhere to the rod-shaped electrode can be changed.

  As described above, poor welding due to the sticking of the rod-shaped electrode is likely to occur when the deposit is accumulated. By changing the position where the deposit adheres to the second rod-shaped electrode, the deposit of the deposit can be suppressed, so that the occurrence of poor welding can be suppressed. In addition, since the accumulation of deposits can be suppressed, the number of times of cleaning and polishing the second rod-shaped electrode can be reduced.

  The electrode polishing apparatus 100 according to the present embodiment is configured to be able to change the position of the sandpaper 12 in contact with the first rod-shaped electrode 51 by moving the sandpaper 12 by the contact position changing mechanism 3. Below, the detailed structure of the contact position change mechanism 3 is demonstrated.

  The electrode polishing apparatus 100 in the present embodiment is configured to change the position of the sandpaper 12 when the polishing of the first rod-shaped electrode 51 is completed. Thus, the next time the first rod-shaped electrode 51 is polished, the new surface of the sandpaper 12 can be polished. However, the timing for changing the position of the sandpaper 12 is not limited to after the polishing of the first rod-shaped electrode 51, and may be, for example, before the polishing of the first rod-shaped electrode 51 is started.

  The long sandpaper 12 is wound around the unwinding portion 35 in a roll shape, and one end thereof is fixed to the winding portion 34. As described above, the sandpaper 12 is arranged in such a manner as to cover the upper surface of the first metal part 11 of the first polishing mechanism 1.

  When the polishing of the first rod-shaped electrode 51 is finished, the cylinder 32 moves and pushes the pusher 33 in a direction approaching the take-up gear 34a. The tip of the pusher 33 has a shape that meshes with the take-up gear 34a of the take-up portion 34. The pusher 33 pushed by the cylinder 32 meshes with the take-up gear 34a and rotates the take-up gear 34a. As a result, the sandpaper 12 is unwound from the unwinding portion 35 and moves in the direction of being wound around the winding portion 34, so that the position of the sandpaper 12 in contact with the first rod-shaped electrode 51 is changed.

  With the configuration described above, the position of the sandpaper 12 in contact with the first rod-shaped electrode 51 can be changed, so that the first rod-shaped electrode 51 can always be polished on a new surface of the sandpaper 12. Further, since the position of the sandpaper 12 can be automatically changed after the polishing of the first rod-shaped electrode 51, the operator does not need to change the position of the sandpaper 12 manually.

<Second Embodiment>
The electrode polishing apparatus 100 in the first embodiment is configured to polish the first rod-shaped electrode 51 of the pair of rod-shaped electrodes used for electric resistance welding.

  In contrast, the electrode polishing apparatus according to the second embodiment is configured to be able to polish the second rod-shaped electrode in addition to the first rod-shaped electrode 51. The second rod-shaped electrode is an electrode constituting a pair of rod-shaped electrodes used for electric resistance welding together with the first rod-shaped electrode 51. The shape of the tip of the second rod-like electrode is a planar shape.

  FIG. 7 is a schematic side view of the second polishing mechanism 71 for polishing the second rod-shaped electrode 52. Under the second polishing mechanism 71, a second metal part 72 having a flat part 72a is provided. The flat surface portion 72 a is located on the surface with which the second rod-shaped electrode 52 abuts, here, the lower surface side of the second metal portion 72.

  Sandpaper 73 is disposed so as to cover the flat surface portion 72 a of the second metal portion 72. One end of the long sandpaper 73 is fixed to the unwinding portion 75, and the other end is fixed to the winding portion 74.

  Similarly to the first polishing mechanism 1, the second polishing mechanism 71 is configured to be linearly movable in the X-axis direction and the Y-axis direction, and to be rotatable about the rotation axis L3. The configuration of the linear movement mechanism that moves the second polishing mechanism 71 in the X-axis direction and the Y-axis direction is the same as the configuration of the mechanism that moves the first polishing mechanism 1 in the X-axis direction and the Y-axis direction. The configuration of the second rotating mechanism that rotates the second polishing mechanism 71 is the same as the configuration of the first rotating mechanism 2 that rotates the first polishing mechanism 1. The linear movement mechanism and the second rotation mechanism constitute a drive mechanism that drives the second polishing mechanism 71.

  FIG. 8 is a view for explaining a method of polishing the second rod-shaped electrode 52. As shown in FIG. 8A, the second rod-shaped electrode 52 is moved upward in a state where the second metal portion 72 of the second polishing mechanism 71 is disposed above the second rod-shaped electrode 52. And the 2nd grinding | polishing mechanism 71 is driven by the drive mechanism mentioned above in the state which the front-end | tip part of the 2nd rod-shaped electrode 52 pressed against the plane part 72a of the 2nd metal part 72 via the sandpaper 73. (See FIG. 8 (b)).

  One of the linear movement mechanism and the second rotation mechanism operates. When the linear movement mechanism is operated, polishing can be effectively performed using a longer distance than the rotation operation.

  With the configuration described above, the tip of the second rod-shaped electrode 52 can be polished with the sandpaper 73, so that the deposits attached to the tip can be removed.

  The electrode polishing apparatus 100 according to the first embodiment described above is configured to change the contact position between the first rod-shaped electrode 51 and the sandpaper 12 by moving the sandpaper 12 by the contact position changing mechanism 3. ing. Similarly, the electrode polishing apparatus according to the present embodiment may be configured such that the contact position between the second rod-shaped electrode 52 and the sandpaper 73 can be changed by moving the sandpaper 73. The configuration for changing the position of the sandpaper 73 can be the same as that of the contact position changing mechanism 3 described in the first embodiment.

  The present invention is not limited to the above embodiment, and various applications and modifications can be made within the scope of the present invention.

  For example, in the above-described embodiment, it has been described that the polishing is performed in a state where the rod-shaped electrode and the polishing mechanism are arranged in the vertical direction. However, the polishing is performed in a state where the rod-shaped electrode and the polishing mechanism are arranged in the horizontal direction. It may be.

  The sheet-like abrasive is not limited to sandpaper.

  The tip of the first rod-shaped electrode 51 has been described as being polished with the sandpaper 12 inserted into the recess 11a of the first metal part 11, but by using the recess 11a as a polishing surface, A configuration in which the paper 12 is not disposed can also be adopted. For example, the tip of the first rod-shaped electrode 51 can be polished without disposing the sandpaper 12 by applying abrasive coating or the like to the concave portion 11a of the first metal portion 11.

  In the embodiment described above, the contact position changing mechanism 3 is configured to change the contact position between the first rod-shaped electrode 51 and the sandpaper 12 by moving the sandpaper 12. However, the contact position changing mechanism 3 is configured to change the contact position between the first rod-shaped electrode 51 and the sandpaper 12 by moving the first rod-shaped electrode 51 instead of moving the sandpaper 12. It may be.

  It can also comprise so that the welding apparatus provided with the 1st rod-shaped electrode 51 mentioned above and the 2nd rod-shaped electrode 52 may be equipped with the electrode polishing apparatus 100 mentioned above. In this case, the welding apparatus includes a first rod-shaped electrode 51, a second rod-shaped electrode 52, and an electrode polishing device 100. According to the welding apparatus configured as described above, the tip end portion of the first rod-like electrode 51 used for welding can be reliably polished.

DESCRIPTION OF SYMBOLS 1 1st grinding | polishing mechanism 2 1st rotation mechanism 3 Contact position change mechanism 4 X-axis direction rail 5 Y-axis direction rail 11 1st metal part 11a Recessed part 12 Sand paper 31 Motor 32 Cylinder 33 Pusher 34 Winding part 35 Unwinding part 36 pulley 37 belt 51 first rod-shaped electrode 52 second rod-shaped electrode 71 second polishing mechanism 72 second metal portion 72a flat portion 73 sandpaper 100 electrode polishing apparatus L1 rotation axis L2 central axis L3 of the first rod-shaped electrode rotation shaft

Claims (9)

An electrode polishing apparatus for polishing the tip of the first rod-shaped electrode having a convex curved surface at the tip,
A first polishing mechanism having a recess and polishing the tip of the first rod-shaped electrode inserted into the recess;
A rotation mechanism that rotates the first polishing mechanism around a rotation axis that passes through the deepest position of the recess;
With
The position of the said rotating shaft exists in the position shifted | deviated from the position of the central axis of a said 1st rod-shaped electrode, The electrode polishing apparatus characterized by the above-mentioned. The first polishing mechanism is configured to polish the tip portion of the first rod-shaped electrode by rotating in a state where the tip portion of the first rod-shaped electrode is in contact with the concave portion via a sheet-like abrasive. Configured,
The electrode polishing apparatus according to claim 1, further comprising a contact position changing mechanism that changes a contact position between the first rod-shaped electrode and the abrasive.   The said contact position change mechanism is comprised so that the said abrasive | polishing material may be moved in order to change the contact position of the said 1st rod-shaped electrode and the said abrasive | polishing material. Electrode polishing equipment. The abrasive has a long shape,
The contact position changing mechanism is:
An unwinding section for unwinding the abrasive in a rolled state;
A winding unit that winds up the abrasive unwound from the unwinding unit;
The electrode polishing apparatus according to claim 3, further comprising:   The said contact position change mechanism is comprised so that the said abrasive | polishing material may be moved, when grinding | polishing of the said 1st rod-shaped electrode by the said 1st grinding | polishing mechanism is complete | finished. Electrode polishing device. A second polishing mechanism for polishing the tip of the second rod-shaped electrode, the tip of which has a planar shape and is welded in pairs with the first rod-shaped electrode;
A drive mechanism for driving the second polishing mechanism;
With
The second polishing mechanism has a flat portion, and is driven by the driving mechanism in a state where the tip portion of the second rod-shaped electrode is pressed against the flat portion via a sheet-like abrasive, The electrode polishing apparatus according to claim 1, wherein the electrode polishing apparatus is configured to polish a tip portion of the second rod-shaped electrode. The drive mechanism is
A second rotating mechanism for rotating the second polishing mechanism;
A linear movement mechanism for linearly moving the second polishing mechanism;
The electrode polishing apparatus according to claim 6, further comprising: The electrode polishing apparatus according to claim 6 or 7,
The first rod-shaped electrode;
The second rod-shaped electrode;
A welding apparatus comprising: The tip of the rod-shaped electrode is polished by rotating the polishing mechanism in a state where the tip of the rod-shaped electrode having a convex curved surface is inserted into the recess of the polishing mechanism provided with the recess. An electrode polishing method that comprises:
Adjusting the position of the polishing mechanism and the rod-shaped electrode so that the position of the rotation axis passing through the deepest position of the recess is shifted from the position of the central axis of the rod-shaped electrode;
After adjusting the position of the polishing mechanism and the rod-shaped electrode, the step of rotating the polishing mechanism around the rotation axis in a state where the tip of the rod-shaped electrode is inserted into the recess of the polishing mechanism;
An electrode polishing method comprising:

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