JP5756726B2 - Polishing machine for pressure members for spot welding equipment - Google Patents

Description

  The present invention relates to a polishing machine for polishing a pressure member that pressurizes a plate material together with a pair of welding electrodes when spot welding a plurality of plate materials.

  A spot welding apparatus is used to weld plate materials such as a plurality of steel plates. In the spot welding apparatus, a plurality of plate members are overlapped to form a joining target part, and the joining target part is gripped from both sides with a pair of welding electrodes and pressed. A current is passed between the pair of welding electrodes, a nugget is formed by Joule heat, and a plurality of plate materials are joined to each other.

  As described above, there is a possibility that the plate material is deformed when the plurality of plate materials are gripped and pressed by the pair of welding electrodes. In order to cope with this problem, there has been proposed a technique for preventing deformation of a plate material when a plurality of plate materials are held and pressed by a pair of welding electrodes, and an example thereof is described in Patent Document 1. Has been. In the spot welding apparatus described in Patent Document 1, an arm is provided for each of a pair of welding robots, and a spot welding gun is attached to each arm via a wrist portion. Each list part is provided with a positioning gauge individually. Each positioning gauge is formed by integrally forming a ring-shaped pressing plate (pressing member) at the tip of a stay connected to each wrist part.

  In the spot welding apparatus described in Patent Document 1, after a plurality of workpieces (plate materials) are stacked, a pressing plate for a positioning gage is obtained in the middle of obtaining pressure by the welding electrodes of a pair of spot guns contacting the workpieces. Presses the workpiece and starts pressurization. On the other hand, after welding a plurality of workpieces, it is set so that the pressing force of the positioning gauge is released while the pressing force of each welding electrode is released. It is said that such a process can prevent the workpiece from being deformed.

  On the other hand, when the process of spot welding a plate material with a spot welding apparatus as described in Patent Document 1 is repeated, the welding electrode is consumed by pressurization and heat generation, and the tip shape of the welding electrode changes. Since such consumption of the welding electrode affects the welding quality in the welding target portion, it is necessary to periodically shape the tip of the welding electrode in order to maintain good welding quality.

  An example of a tip dresser that shapes the welding electrode of such a spot welding apparatus is described in Patent Document 2. The tip dresser described in Patent Document 2 includes a cutter holder that holds a cutting blade that cuts the tip and side portions of a welding electrode tip (welding electrode), and a rotating unit that rotates the cutter holder. Yes. Moreover, the truncated cone-shaped recessed part for guiding a welding electrode tip to the cutter holder is formed, and the cutting blade protrudes from the truncated-cone-shaped recessed surface and is attached by a predetermined amount.

Japanese Patent Laid-Open No. 6-1555039 JP-A-8-141749

  However, in the spot welding apparatus described in Patent Document 1, when spot welding a plurality of plate materials, spatter such as slag and metal particles scatters, and a part of the spatter adheres to the pressure member. was there. In the chip dresser described in Patent Document 2, since the cutting blade is attached to the truncated conical concave surface, the pressure member could not be polished using this chip dresser.

  An object of the present invention is to provide a pressure member polishing machine for a spot welding apparatus capable of polishing a pressure member that pressurizes a plate material together with a pair of welding electrodes when spot welding a plurality of plate materials. .

  The polishing machine for a pressure welding member for a spot welding apparatus according to the present invention is a pressurization in which a plurality of stacked plates are gripped by a pair of welding electrodes and pressed by contact with any of the plates. It has a polishing member which is provided so as to be movable relative to the member and polishes the pressure member.

  A polishing machine for a pressure member for a spot welding apparatus according to the present invention is characterized in that a first actuator for moving the polishing member relative to the pressure member is provided.

  A polishing machine for a pressure welding member for a spot welding apparatus according to the present invention includes an electrode polishing member that operates to polish the pair of welding electrodes, and a holding member that operably holds the electrode polishing member. The polishing member is held by the holding member.

  The pressure welder polishing machine for spot welding apparatus according to the present invention is provided with a second actuator that moves the pressure member relative to the polishing member when the pressure member is polished by the polishing member. It is characterized by.

  According to the present invention, when a plurality of plate materials are gripped by a pair of welding electrodes and a pressure member is pressed against any of the plate materials and the plate materials are spot-welded to each other, spatter such as slag and metal particles is scattered. When adhering to the pressure member, the pressure member can be polished with a polishing member to remove spatter.

  According to the present invention, the pressure member can be polished with the polishing member by moving the polishing member with the first actuator.

  According to the present invention, the pressure member can be polished by the polishing member simultaneously with polishing the pair of welding electrodes by the electrode polishing member.

  According to the present invention, the pressure member can be polished by the polishing member by moving the pressure member by the second actuator.

It is a typical side view which shows the spot welding apparatus which has a pressurization plate grind | polished with the grinder of this invention. It is a partial perspective view which shows the polisher of this invention, and the spot welding apparatus shown by FIG. It is sectional drawing which shows the structure of 1st Embodiment of the polisher in this invention. It is sectional drawing which shows the structure of 2nd Embodiment of the polisher in this invention.

  In the present invention, the pressure member is polished by moving relative to the pressure member and the polishing member in contact with each other. For this reason, the pressure member can be polished by the polishing member while either the pressure member or the polishing member is moving and the other is stopped. In the present invention, in the polishing of the pressure member, the pressure member is removed in order to remove the deposits adhering to the pressure member and to maintain the contact state between the pressure member and the plate material in an intended state. For example, shaping the surface. The pressurizing member in the present invention may be configured to be pressed against any one of the plate members positioned outside among the plurality of stacked plate members.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A spot welding apparatus 10 shown in FIG. 1 has a welding gun body 11 formed of a C-shaped yoke member. The welding gun body 11 is attached to an arm of a welding robot (not shown), and the welding gun body 11 can be moved in either the horizontal direction or the vertical direction by the operation of the arm of the welding robot. Yes. A lower end portion of the welding gun main body 11 in FIG. 1 is formed with a protruding portion 11a extending in the horizontal direction, and a cylindrical welding electrode (electrode tip) 12 is formed at the tip of the protruding portion 11a. It is attached. In the present embodiment, description will be made assuming that the welding electrode 12 is attached to the welding gun main body 11 so as not to move in the vertical direction and the horizontal direction. When the welding gun body 11 is moved up and down, the welding electrode 12 can be moved up and down. The welding electrode 12 is provided around a vertical axis A, and the tip of the welding electrode 12 is directed upward. The tip of the welding electrode 12 is formed in a hemispherical shape.

  On the other hand, an electrode drive actuator 13 is attached to the upper end of the welding gun body 11. An electrode drive rod 14 that is reciprocated in the direction along the axis A (that is, the vertical direction) is provided by the power of the electrode drive actuator 13. A welding electrode (electrode tip) 15 is attached to the tip of the electrode drive rod 14, specifically, the lower end. For this reason, the welding electrode 15 can be moved in the vertical direction while the welding gun body 11 is stopped. The welding electrode 15 is configured in a cylindrical shape, and the welding electrode 15 is arranged around the axis A. The tip of the welding electrode 15 is directed downward, and the tip of the welding electrode 15 is formed in a hemispherical shape. In this way, when the welding electrode 15 moves in the vertical direction along the axis A by the power of the electrode drive actuator 13, the distance between the welding electrode 15 and the welding electrode 12 changes.

  The spot welding apparatus 10 according to the present embodiment is configured to hold and press the work 16 from the thickness direction, specifically, the vertical direction by a pair of welding electrodes 12 and 15. That is, the pair of welding electrodes 12 and 15 constitutes a main pressure member in the spot welding apparatus 10. In addition, the workpiece 16 includes a plurality of plate members, for example, three plate members 16a, 16b, and 16c, which are overlapped in the thickness direction to form a welding target portion 16d. The three plate members 16a, 16b, and 16c are stacked one above the other. The welding target portion 16d is welded by the spot welding apparatus 10. Further, the plate members 16a, 16b, and 16c have different thicknesses. Specifically, the thickness of the plate material 16a is thinner than the single thickness of the plate materials 16b and 16c, and the thickness of the plate materials 16b and 16c is the same.

  On the other hand, a pressure actuator 17 is attached to the welding gun body 11 on the side of the electrode drive actuator 13. A pressure rod 18 that reciprocates in the vertical direction by the power of the pressure actuator 17 is provided. A pressure arm 19 is attached to the lower end of the pressure rod 18. The pressure arm 19 has a support portion 19a that extends in the up-down direction and an arm portion 19b that extends in the horizontal direction from the lower end of the support portion 19a. Further, a pressure plate 20 is attached to the tip of the arm portion 19b. As shown in FIG. 2, the tip of the pressure plate 20 is bifurcated to form two pressure portions 20a and 20b.

  When the pressure plate 20 is moved in the vertical direction by the power of the pressure actuator 17, even if the welding electrode 15 and the pressure plate 20 are located at the same height, the welding electrode 15 and the pressure plate It is comprised so that 20 may not contact. Specifically, when the pressure plate 20 is raised or lowered by the pressure actuator 17, the axis A is positioned between the two pressure units 20a and 20b in a plane perpendicular to the axis A. It is configured. In the spot welding apparatus 10 in this embodiment, when the welding target part 16d of the workpiece | work 16 is hold | gripped and pressurized by a pair of welding electrodes 12 and 15, among the surfaces of the plate | board material 16a located in the uppermost position The two pressurizing portions 20a and 20b of the pressurizing plate 20 are configured to come into contact with and pressurize at two locations on both sides of the location where the welding electrode 15 is in contact. Thus, in the spot welding apparatus 10, the pressurizing plate 20 constitutes a sub-pressurizing member.

  Furthermore, the upper and lower surfaces of the pressure plate 20 are both flat surfaces, and the entire pressure plate 20 or the two pressure portions 20a and 20b are partially constituted by an insulating member. Further, as the pressure actuator 17 and the electrode drive actuator 13, any of an electric motor, a pneumatic cylinder, a hydraulic cylinder, and the like may be used.

  Next, the process of welding the workpiece 16 with the spot welding apparatus 10 will be described. First, the workpiece 16 is conveyed to the welding location B in the conveyance path of the workpiece 16 and stops. Then, the arm of the welding robot operates to move the welding electrode 15 above the welding location B, and move the welding electrode 12 below the welding location B. Then, the welding electrode 12 is raised and the welding electrode 15 is lowered. Further, the pressure arm 19 is lowered by the pressure actuator 17 to press the two pressure portions 20a and 20b against the plate material 16a. By such an operation, the welding target portion 16d of the workpiece 16 is gripped and pressed by the pair of welding electrodes 12 and 15, and the both sides of the surface of the uppermost plate member 16a at which the welding electrode 15 is in contact. Two places will be pressurized by the two pressurization parts 20a and 20b. In this state, a nugget is formed on the welding target portion 16d by flowing a current from a power supply unit (not shown) between the pair of welding electrodes 12 and 15, and the plate members 16a, 16b and 16c are welded (joined) to each other.

  Here, since the thickness of the uppermost plate member 16a is thinner than the single plate members 16b and 16c and has a lower rigidity, the plate member 16a is bent upward and a gap is formed between the plate member 16a and the plate member 16b. And On the other hand, in this embodiment, the plate material 16a is pressurized by the two pressurizing portions 20a and 20b of the pressurizing plate 20. For this reason, the fall of the current density between the thin board | plate material 16a and the thick board | plate material 16b is suppressed, and the fall of welding quality can be prevented. Further, when the welding of the welding target portion 16d is completed, the welding electrode 15 is raised, the pressure plate 20 is raised, and the welding electrodes 12, 15 and the pressure plate 20 are separated from the welding location B so as to be welded. The robot arm moves. Moreover, the workpiece | work 16 in which the welding with the spot welding apparatus 10 was performed is conveyed to the following process.

  By the way, when the process of spot welding the workpiece 16 by the spot welding apparatus 10 is repeated, the welding electrodes 12 and 15 are consumed by pressurization and heat generation, and the tip shapes of the welding electrodes 12 and 15 change. Such consumption of the welding electrodes 12 and 15 may affect the welding quality in the welding target portion 16d. Therefore, in order to keep the welding quality good, it is necessary to periodically shape the tips of the welding electrodes 12 and 15.

  On the other hand, in the step of spot welding the workpiece 16, spatter such as slag and metal particles may be scattered and a part of the spatter may adhere to the pressure plate 20. In particular, if spatter adheres to the two pressure portions 20a and 20b of the pressure plate 20, the contact state of the two pressure portions 20a and 20b with respect to the plate material 16a may not be able to maintain the desired state. Here, the intended state is that when the workpiece 16 is gripped by the pair of welding electrodes 12 and 15 and energized, the thin plate material 16a is deformed, and a gap is formed between the thick plate material 16b and the thin plate material 16a. It means contact pressure, contact area, etc. that can be prevented from being formed.

  The polishing machine of the present invention has a function of polishing the welding electrodes 12 and 15 and a function of polishing the pressure plate 20. The configuration of the first embodiment of the polishing machine according to the present invention will be described with reference to FIGS. The polishing machine 21 includes a polishing machine main body 22 configured in a box shape, and a table 23 provided on the upper part of the polishing machine main body 22.

  The table 23 is provided with a storage chamber 24, and openings 24 a and 24 b are provided above and below the storage chamber 24. A cylindrical holder 25 is stored in the storage chamber 24. The holder 25 has a cylindrical portion 25b having a mounting hole 25a and an outward flange 25c projecting outside the cylindrical portion 25b. The holder 25 is configured to be rotatable about an axis C passing through the center. The axis C is disposed along a vertical direction, and the holder 25 is rotatably held by two bearings 26 and 27 disposed above and below. A gear 25d is formed on the outer periphery of the outward flange 25c. In FIG. 3, the axis A and the axis C are shown in a matched state.

  A polishing blade (chip dresser) 28 is attached to the attachment hole 25 a of the holder 25. The polishing blade 28 is a plate member made of a metal material. The polishing blade 28 is attached in such a direction that two parallel sides are up and down, and the upper and lower sides of the polishing blade 28 are provided with blade portions 29 and 30 that are curved or formed in a predetermined shape, respectively. Yes. The blade portion 29 is for polishing and shaping the welding electrode 15, and the blade portion 30 is for polishing and shaping the welding electrode 12.

  Further, wire brushes 31 and 32 are fixed to both ends of the holder 25 in the direction along the axis C. A wire brush 31 is attached to the upper end of the holder 25, and a wire brush 32 is attached to the lower end of the holder 25. The wire brushes 31 and 32 are elements for polishing the pressure plate 20, and the wire brushes 31 and 32 are made of, for example, a metal material. In the example of FIG. 3, wire brushes 31 and 32 are attached in an annular shape over the entire circumference of the holder 25. That is, the wire brushes 31 and 32 are disposed so as to surround the polishing blade 28 with the axis C as the center. The wire brushes 31 and 32 are extended in the direction along the axis C.

  On the other hand, an electric motor 33 is provided in the polishing machine main body 22 as a power source for generating power for rotating the gear 25d. A reduction gear (not shown) constituted by a gear mechanism or the like is provided in a power transmission path from the output shaft (not shown) of the electric motor 33 to the gear. Since this reduction gear is the same as that used conventionally, illustration and description are omitted.

  Further, the table 23 is configured to be movable in the vertical direction with respect to the polishing machine main body 22. An actuator (not shown) such as an electric motor, a hydraulic cylinder, and a pneumatic cylinder as a power source for raising and lowering the table 23 is provided in the polishing machine main body 22. A configuration in which the rotary motion of the electric motor is converted into a linear motion and the table 23 is moved in the vertical direction, or a configuration in which the table 23 is moved in the vertical direction by a linear motion of a rod of a hydraulic cylinder or a pneumatic cylinder is well known. Therefore, illustration and description are omitted. In addition, the grinding machine 21 in this embodiment may be comprised so that a movement with respect to the spot welding apparatus 10 may be carried out, and may be provided fixed to the line side of a welding process.

  Next, the process of polishing the welding electrodes 12 and 15 by the polishing machine 21 and polishing the pressure plate 20 by the polishing machine 21 will be described. While the polishing machine 21 is fixed at the installation position, the polishing machine 21 is installed without moving the welding electrodes 12, 15 and the pressure plate 20, or without moving the welding electrodes 12, 15 and the pressure plate 20. The table 23 of the polishing machine 21 is positioned between the welding electrode 12 and the welding electrode 15 by moving from the location. Here, the axis A that is the movement reference of the welding electrodes 12 and 15 and the axis C that is the rotation center of the gear 25d are held in a state of being coincident. In addition, the lower end surface of the pressure plate 20 is stopped above the tip of the welding electrode 12.

  When the electric motor 33 is driven, the torque is transmitted to the gear 25d via the reduction gear. Then, the holder 25 rotates and the polishing blade 28 and the wire brushes 31 and 32 rotate about the axis C. Further, the table 23 of the polishing machine 21 is lowered to bring the blade portion 30 into contact with the welding electrode 12 and stopped, and the welding electrode 12 is polished and shaped. Further, the welding electrode 15 and the pressure plate 20 are lowered, the welding electrode 15 is brought into contact with the blade portion 29 and polished, and the tip of the welding electrode 15 is polished and shaped. At the same time, the lower surface of the pressure plate 20, particularly the lower surfaces of the two pressure portions 20 a and 20 b, are brought into contact with the wire brush 31 and polished to remove spatter adhering to the pressure plate 20.

  In this way, the welding electrodes 12 and 15 are shaped and the spatter of the pressure plate 20 is removed, and then the welding electrode 15 and the pressure plate 20 are raised and the table 23 is raised. Further, the table 23 is retracted from between the welding electrodes 12 and 15, and the electric motor 33 is stopped.

  As described above, according to the polishing machine 21 in the present embodiment, it is possible to remove spatter adhering to the pressure plate 20. Therefore, the contact state of the two pressing portions 20a and 20b with respect to the plate material 16a of the workpiece 16 can be maintained in an intended state. In addition, according to the polishing machine 21 in the present embodiment, the step of shaping the welding electrodes 12 and 15 and the step of removing the spatter adhering to the pressure plate 20 can be performed simultaneously (in parallel). it can. Therefore, the total work time required for the step of shaping the welding electrodes 12 and 15 and the step of removing the spatter adhering to the pressure plate 20 can be relatively shortened. In the above polishing step, the operation of polishing the pressure plate 20 with the lower wire brush 32 is not performed.

  Next, a case will be described in which a workpiece is configured by placing the thinnest plate member at the bottom and stacking two thick plate members thereon. In this case, the pressure plate is positioned below the workpiece. When the welding electrode 12 comes into contact with the thin plate material and the workpiece is gripped and pressed by the welding electrodes 12 and 15, the two pressurizations of the pressing plate 20 are applied to both sides of the pressing position by the welding electrode 12. Spot welding is performed by applying pressure by the portions 20a and 20b.

  When such a process is repeated, spatter adheres to the upper surface of the pressure plate 20. Therefore, a process of polishing the upper surface of the pressure plate 20 with the wire brush 32 of the polishing machine 21 will be described. In this step, the pressure plate 20 is moved down to stop the pressure plate 20 while moving the upper surface of the pressure plate 20 below the upper end of the welding electrode 12. Then, the table 23 is positioned between the welding electrode 15 and the welding electrode 12, and the welding electrodes 12 and 15 are shaped by the polishing blade 28 in the same manner as described above. At the same time, the spatter adhering to the upper surface of the pressure plate 20 is removed by the wire brush 32. In this case, the operation of polishing the pressure plate 20 with the upper wire brush 31 is not performed.

  Further, in the present embodiment, when the process of polishing the pressure plate 20 by bringing the wire brushes 31 and 32 into contact with the pressure plate 20 is repeated, the wire brushes 31 and 32 are deformed outwards about the axis C, There is a possibility that the tips of the wire brushes 31 and 32 are worn. In such a case, by lowering the contact pressure of the wire brushes 31 and 32 with respect to the pressure plate 20, it is possible to suppress a decrease in polishing performance due to the wire brushes 31 and 32.

  Here, the correspondence between the configuration described in the present embodiment and the configuration of the present invention will be described. The plate material 16a corresponds to “one of a plurality of plate materials” of the present invention, and the pressure plate 20 is The wire brush corresponds to the polishing member of the present invention. The electric motor 33 corresponds to the first actuator of the present invention, the polishing blade 28 corresponds to the electrode polishing member of the present invention, and the holder 25 corresponds to the holding member of the present invention.

  Furthermore, the structure of 2nd Embodiment in the polisher of this invention is mainly demonstrated with reference to FIG. The polishing machine 21 according to the second embodiment has two tables 23a and 23b arranged one above the other. Each of the tables 23a and 23b can be independently moved or stopped in the vertical direction. Each table 23 a, 23 b is provided with a holder 25 so as to be rotatable, and a polishing blade 28 is attached to each attachment hole 25 a of each holder 25.

  In addition, a wire brush 31 is attached to the lower end of the holder 25 provided on the table 23 a disposed above, and no wire brush is attached to the upper end of the holder 25. Further, in the table 23 a disposed above, the blade portion 29 is provided on the upper side of the polishing blade 28, but the blade portion is not provided on the lower side of the polishing blade 28.

  On the other hand, a wire brush 32 is attached to the upper end of the holder 25 provided on the table 23 b disposed below, and no wire brush is attached to the lower end of the holder 25. Further, in the table 23 b disposed below, the blade portion 30 is provided on the lower side of the polishing blade 28, but the blade portion is not provided on the upper side of the polishing blade 28. Furthermore, in the second embodiment, the two holders 25 are arranged coaxially. In the configuration shown in FIG. 4, the other components are the same as those in FIGS. 2 and 3, and thus the same reference numerals as those in FIGS.

  Next, the operation when the pair of welding electrodes 12 and 15 are polished and the pressure plate 20 is polished by the polishing machine 21 of the second embodiment will be described. First, the tables 23 a and 23 b are positioned between the pair of welding electrodes 12 and 15, and the pressure plate 20 is positioned between the wire brush 31 and the wire brush 32. When each holder 25 is rotated, the sputter can be removed by simultaneously polishing the upper and lower surfaces of the pressure plate 20 from both sides with the wire brushes 31 and 32 as shown in FIG. Further, the welding electrode 15 can be lowered and polished and shaped by the blade portion 29 of the polishing blade 28, and the welding electrode 12 can be raised and polished and shaped by the blade portion 30 of the polishing blade 28.

  Further, in the polishing machine 21 according to the second embodiment, when the wire brush 31 is deformed outward about the axis C, the force for pressing the wire brush 31 against the pressure plate 20 is relatively lowered by lowering the table 23a. Can be high. Further, when the wire brush 32 is deformed outward about the axis C, the force for pressing the wire brush 32 against the pressure plate 20 can be relatively increased by raising the table 23b.

  The present invention is not limited to the first embodiment and the second embodiment, and various modifications can be made without departing from the scope of the invention. For example, when attaching the wire brushes 31, 32 to the holder 25, the wire brushes 31, 32 may be arranged at predetermined intervals along the circumferential direction of the holder 25. Further, instead of the plate-shaped pressure plate 20, a rod-shaped pressure member may be used.

  Further, the pressure plate 20 is attached to the pressure arm 19 so as to be movable in the horizontal direction, and the pressure arm 19 is provided with an actuator 34 for reciprocating the pressure plate 20 in the horizontal direction. You can also. The actuator 34 is indicated by a two-dot chain line in FIG. With this configuration, the wire brush 31 or the wire brush 32 is brought into contact with the pressure plate 20, and the pressure plate 20 is reciprocated in the horizontal direction without rotating the wire brush 31 or the wire brush 32. Thus, the pressure plate 20 can be polished. As a configuration in which the pressure plate 20 can be moved in the horizontal direction with respect to the pressure arm 19, a known rail may be provided and the pressure plate 20 may be supported by the rail. The actuator 34 that reciprocates the pressure plate 20 in the horizontal direction may use a known mechanism such as an electric motor, a hydraulic cylinder, or a pneumatic cylinder. The actuator 34 corresponds to the second actuator of the present invention.

  Further, in the present embodiment, the spot welding apparatus 10 may be configured such that the pair of welding electrodes 12 and 15 are relatively movable in the horizontal direction. In this case, the polishing machine 21 may be configured such that the axis C serving as the rotation center of the wire brushes 31 and 32 and the polishing blade 28 is along the horizontal direction.

  Furthermore, the polishing machine in this embodiment attaches a wire brush to a holding member that does not have a polishing blade for polishing the welding electrode, and polishes the pressure plate with the wire brush by rotating or reciprocating the holding member. You may comprise as follows. As described above, as long as the holding member is configured to reciprocate, the shape of the holding member may be a rectangular parallelepiped, a cube, or the like.

  Furthermore, the number of plate materials to be spot welded may be two, or four or more. Further, the thicknesses of the plurality of plate materials may all be the same or different. Furthermore, the pressurizing member of the spot welding apparatus may be configured to pressurize both sides of the stacked plate members. Furthermore, the spot welding apparatus may be configured such that a pair of welding electrodes can move together with respect to the welding gun body.

  Furthermore, in the present embodiment, a wire brush is cited as the polishing member, but not limited to this, a polishing pad made of a soft synthetic resin, a metal blade, a paper file, or the like is used as the polishing member. May be.

DESCRIPTION OF SYMBOLS 10 Spot welding apparatus 12, 15 Welding electrode 16a, 16b, 16c Plate material 20 Pressure plate 21 Polishing machine 25 Holder 28 Polishing blade 33 Electric motor 34 2nd actuator

Claims (4)

  A plurality of plate members stacked on top of each other are provided with a pair of welding electrodes so as to be movable relative to a pressurizing member that contacts and pressurizes the plate member when spot welding is performed. A polishing machine for a pressure member for a spot welding apparatus, comprising a polishing member for polishing. In the polishing machine for the pressure member for a spot welding apparatus according to claim 1,
A polishing machine for a pressurizing member for a spot welding apparatus, wherein a first actuator for moving the polishing member relative to the pressurizing member is provided. In the polishing machine for the pressure member for a spot welding apparatus according to claim 1 or 2,
An electrode polishing member that operates to polish the pair of welding electrodes; and a holding member that operably holds the electrode polishing member, and the polishing member is held by the holding member. A polishing machine for pressure members for spot welding equipment. In the polishing machine for the pressure member for a spot welding apparatus according to claim 1,
A polishing machine for a pressurizing member for a spot welding apparatus, comprising: a second actuator that moves the pressurizing member with respect to the polishing member when the pressing member is polished by the polishing member.

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