WO2022107332A1 - 溶接ガン - Google Patents
溶接ガン Download PDFInfo
- Publication number
- WO2022107332A1 WO2022107332A1 PCT/JP2020/043480 JP2020043480W WO2022107332A1 WO 2022107332 A1 WO2022107332 A1 WO 2022107332A1 JP 2020043480 W JP2020043480 W JP 2020043480W WO 2022107332 A1 WO2022107332 A1 WO 2022107332A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- facing
- held
- collar
- facing portion
- welding gun
- Prior art date
Links
- 238000003466 welding Methods 0.000 title claims abstract description 67
- 238000003780 insertion Methods 0.000 claims description 11
- 230000037431 insertion Effects 0.000 claims description 11
- 230000004323 axial length Effects 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000013459 approach Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
- B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/30—Features relating to electrodes
- B23K11/31—Electrode holders and actuating devices therefor
- B23K11/314—Spot welding guns, e.g. mounted on robots
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/30—Features relating to electrodes
- B23K11/31—Electrode holders and actuating devices therefor
- B23K11/311—Electrode holders and actuating devices therefor the actuating device comprising an electric motor
Definitions
- the present invention relates to a welding gun provided with a holding portion for holding a held portion provided on an arm having an electrode for resistance welding.
- a welding gun having a set of holding portions for holding each of the held portions provided on a set of arms having electrodes for resistance welding is known.
- the welding gun is configured to be able to separate or approach (open and close) a set of arms in which the held portion is held by the holding portion.
- resistance welding can be performed by sandwiching the welded portion of the work between the resistance welding electrodes of a set of arms.
- the holding portion of the welding gun for example, the structure described in Japanese Patent Application Laid-Open No. 4-266486 can be adopted.
- the holding portion has a support member and a pin.
- the support member is composed of a set of facing portions and a connecting portion.
- a set of facing portions are arranged so as to face each other, and a held portion of the arm is sandwiched on the tip end side thereof.
- the connecting portion fixes the relative position of the pair of facing portions by connecting the base end sides of the pair of facing portions to each other.
- the pin is inserted into a through hole that integrally penetrates a set of facing portions sandwiching the held portion, and applies a force in a direction in which the pair of facing portions approach each other. That is, a set of facing portions sandwich the held portion via the pin, so that the held portion is held by the holding portion.
- the held portion can be maintained in a state of being firmly fixed to the holding portion even if the arm is repeatedly opened and closed.
- the connecting portion side (base end side) of the set of facing portions is maintained at a constant facing interval.
- a force is applied to the pin side (tip side) of the pair of facing portions in the direction of approaching each other.
- the pressing force that can be applied to the held portion tends to be small on the connecting portion side of the facing portion. That is, it is difficult to bring the surface of the facing portion facing the held portion and the held portion into parallel contact with each other to generate a frictional force between them, so that the holding force of the holding portion cannot be sufficiently increased.
- the present invention solves this kind of problem, and provides a welding gun capable of firmly fixing the held portion of the arm to the holding portion and having excellent durability of the holding portion. The purpose.
- One aspect of the present invention is a welding gun provided with a holding portion for holding a held portion provided on an arm having an electrode for resistance welding, in which the holding portions face each other with the held portion interposed therebetween.
- the distance between the first facing portion and the second facing portion forming the laminated portion together with the held portion and the inner side surfaces of the first facing portion and the second facing portion facing the held portion is the distance between the held portions.
- a connecting portion that fixes the relative positions of the first facing portion and the second facing portion so as to be thicker than the thickness, a through hole that penetrates the laminated portion in the stacking direction, and the through hole of the first facing portion.
- a hollow collar provided with an insertion hole movably inserted in the inside of the first facing portion and arranged coaxially with the axial direction of the through hole of the first facing portion, and the second facing portion. It has a tightening mechanism that is inserted into the through hole, the through hole of the held portion, and the insertion hole of the collar, and tightens the second facing portion, the held portion, and the collar in the stacking direction. Then, by tightening the tightening mechanism, the held portion is sandwiched between the second facing portion and the collar, and the held portion is pressed toward the inner side surface of the second facing portion. To.
- a collar that can be moved along the axial direction (stacking direction of the laminated portion) in the through hole of the first facing portion by tightening the tightening mechanism, and an inner surface surface of the second facing portion.
- the held portion of the arm is sandwiched between and. That is, the held portion is pressed in the stacking direction toward the inner side surface of the second facing portion via the collar. Therefore, the inner side surface of the second facing portion and the held portion of the arm can be brought into contact with each other substantially in parallel to generate a good frictional force between them. As a result, the holding force of the held portion by the holding portion can be increased.
- the tightening is performed by the tightening mechanism as described above, it is possible to avoid applying a force in the direction of approaching each other to the first facing portion and the second facing portion. Therefore, it is possible to suppress the generation of stress between the connecting portion side of the first facing portion and the second facing portion and the other portion. As a result, the durability of the holding portion can be improved.
- the held portion of the arm can be firmly fixed to the holding portion, and the durability of the holding portion can be improved.
- FIG. 3 is a cross-sectional view taken along the line III-III of the welding gun of FIG.
- FIG. 2 is a cross-sectional view taken along the line IV-IV of the welding gun of FIG.
- the welding gun 10 according to the present embodiment of FIG. 1 has a fixed side holding portion 14a that detachably holds the fixed arm 12a, a movable side holding portion 14b that detachably holds the movable arm 12b, and a mounting portion 16. Be prepared.
- the welding gun 10 is attached to the tip arm of a robot (not shown) via the attachment portion 16.
- arm 12 when the fixed arm 12a and the movable arm 12b are not particularly distinguished, they are collectively referred to simply as "arm 12".
- the fixed side holding portion 14a and the movable side holding portion 14b are not particularly distinguished, these are collectively referred to simply as "holding portion 14".
- Resistance welding electrodes 18a and 18b are provided on the tip side of each of the arms 12.
- a held portion 19 (FIG. 3) is provided on each base end side of the arm 12 as a portion held by the holding portion 14.
- the arrow X1 side of FIGS. 1 to 6 is the tip side or the front side
- the arrow X2 side is the base end side or the rear side
- the arrow Y1 side is the upper side
- the robot is a moving means for moving (transporting) the welding gun 10 to a predetermined welding work location.
- the welding gun 10 moves to a position where the work W can be sandwiched between the resistance welding electrodes 18a and 18b.
- the work W is configured by, for example, laminating the materials W1 and W2 to be welded, and has a welding target portion where resistance welding is performed by the welding gun 10.
- a swing unit 20 is disposed below the fixed side holding portion 14a of the welding gun 10.
- the swing unit 20 includes a rod (not shown), a servomotor, and a ball screw, all of which are not shown.
- the rod extends in the vertical direction (arrows Y1 and Y2 directions) in FIG. 1, passes through the inside of the fixed side holding portion 14a, and engages with the movable side holding portion 14b.
- the rotary motion of the servomotor is converted into a forward / backward motion (vertical motion) of the rod in the axial direction via the ball screw.
- the movable side holding portion 14b swings, and the movable arm 12b held by the movable side holding portion 14b swings.
- the movable arm 12b can be separated from the fixed arm 12a held by the fixed side holding portion 14a as shown in FIG. 1 or approached (opened and closed) as shown in FIG. It has become.
- An encoder 22 and a transformer 24 are provided in the vicinity of the swing unit 20.
- the encoder 22 detects the rotation angle of the servo motor.
- the transformer 24 energizes a welding current between the resistance welding electrodes 18a and 18b provided at the tips of the fixed arm 12a and the movable arm 12b.
- the holding portion 14 in a state where the held portion 19 of the arm 12 is held will be specifically described.
- the fixed-side holding portion 14a has a holding portion main body 26 and a tightening mechanism 27.
- the holding portion main body 26 of the fixed side holding portion 14a is provided integrally with the mounting portion 16 at the lower portion on the tip end side of the mounting portion 16.
- the holding portion main body 26 has a first facing portion 34, a second facing portion 36, and a connecting portion 38.
- the holding portion main body 26 is integrally configured from one member, but another member may be integrally configured.
- the first facing portion 34 and the second facing portion 36 face each other with the held portion 19 of the fixed arm 12a interposed therebetween, thereby forming a laminated portion 40 together with the held portion 19 of the fixed arm 12a. That is, in the laminated portion 40, the inner side surface 34a of the first facing portion 34 and the inner side surface 36a of the second facing portion 36 face the held portion 19 of the fixed arm 12a.
- the laminated portion 40 further includes the insulating plates 42 and 44.
- the insulating plate 42 is interposed between the inner side surface 34a of the first facing portion 34 and the held portion 19 of the fixed arm 12a.
- the insulating plate 44 is interposed between the held portion 19 of the fixed arm 12a and the inner side surface 36a of the second facing portion 36.
- Each of the first facing portion 34 and the second facing portion 36 and the fixed arm 12a are electrically insulated by these insulating plates 42 and 44.
- the connecting portion 38 connects the base end sides of the first facing portion 34 and the second facing portion 36 to each other.
- the first facing portion 34 and the first facing portion 34 and the distance between the inner side surface 34a of the first facing portion 34 and the inner side surface 36a of the second facing portion 36 are equal to or larger than the thickness of the held portion 19 of the fixed arm 12a.
- the relative position of the second facing portion 36 is fixed.
- the laminated portion 40 is formed with a through hole 46 that penetrates the laminated portion 40 in the stacking direction (arrows Z1 and Z2 directions). That is, the through hole 46 of the laminated portion 40 is the through hole 34b of the first facing portion 34, the through holes 42a and 44a of the insulating plates 42 and 44, the through hole 12c of the held portion 19 of the fixed arm 12a, and the second facing portion.
- the through holes 36b of 36 are arranged and formed coaxially.
- three through holes 46 (461, 462, 463) are formed in the stacking direction (arrows Z1, Z2 direction) of the laminated portion 40, and two of them penetrate.
- the holes 46 (461, 462) are arranged side by side at intervals in the front-rear direction (arrows X1 and X2 directions).
- the remaining third through hole 46 (461) arranged in the front side (arrow X1 side) is arranged in the vertical direction.
- Hole 46 (463) is arranged.
- through holes 461, 462, and 463 are not particularly distinguished, they are collectively referred to simply as "through holes 46".
- the number and arrangement of the through holes 46 formed in the laminated portion 40 are not particularly limited to the above.
- the tightening mechanism 27 has a bolt 28, a nut 30, and a collar 32.
- the bolt 28 is, for example, a reamer bolt and has a shaft portion 48 and a head portion 50.
- the shaft portion 48 of the bolt 28 is inserted into the through hole 46 of the laminated portion 40.
- an insulating portion 52 for electrically insulating each other is provided between the inner peripheral surface of the through hole 12c of the held portion 19 and the outer peripheral surface of the shaft portion 48 of the bolt 28. ..
- the insulating portion 52 is formed in a cylindrical shape from, for example, an insulating material such as ceramics, and is fitted into the through hole 12c of the held portion 19.
- a protruding end portion 54 protruding from the laminated portion 40 is provided on one end side of the shaft portion 48 of the bolt 28.
- a head portion 50 of the bolt 28 is provided on the other end side of the shaft portion 48 of the bolt 28.
- a male screw 56 is formed on the outer circumference of the protruding end portion 54. Further, no male screw 56 is formed on the outer periphery of the bolt 28 except for the protruding end portion 54 of the shaft portion 48.
- the shaft portion 48 of the bolt 28 is inserted into the through hole 46 of the laminated portion 40 from the second facing portion 36 side toward the first facing portion 34 side. Therefore, the head portion 50 of the bolt 28 comes into contact with the periphery of the through hole 36b of the second facing portion 36 via the flat washer 58. Further, the protruding end portion 54 of the shaft portion 48 projects to the outside (arrow Z2 side) of the laminated portion 40 via the through hole 34b of the first facing portion 34.
- the nut 30 has a female screw 60 screwed into a male screw 56 formed on the protruding end portion 54 of the shaft portion 48.
- the nut 30 is attached to the protruding end portion 54 of the shaft portion 48.
- the nut 30 can be brought close to the head 50 of the bolt 28 via the laminated portion 40.
- the nut 30 can be removed from the shaft portion 48 of the bolt 28 by relatively rotating the nut 30 and the bolt 28 in the direction of releasing the screwing.
- the collar 32 is hollow and is movably inserted into the through hole 34b of the first facing portion 34 in the stacking direction of the laminated portion 40 (axial direction of the through hole 34b, arrows Z1 and Z2 directions). .. Further, the collar 32 is provided with an insertion hole 32a arranged coaxially with the axial direction of the through hole 34b of the first facing portion 34.
- the collar 32 is cylindrical, but is not particularly limited thereto, and may be, for example, C-shaped in the axial direction.
- the diameter of the insertion hole 32a of the collar 32 is substantially the same as the diameter of the shaft portion 48 of the bolt 28, the inner diameter of the insulating portion 52, and the diameter of the through hole 36b of the second facing portion 36.
- the shaft portion 48 of the bolt 28 is inserted into the insertion hole 32a.
- the diameter of the through hole 34b of the first facing portion 34 is larger than the diameter of the through hole 36b of the second facing portion 36 by the amount of the radial thickness of the collar 32.
- the diameter of the through hole 12c of the held portion 19 is larger than the diameter of the through hole 36b of the second facing portion 36 by the thickness of the insulating portion 52 in the radial direction.
- the outer diameter of the collar 32 is substantially the same as the diameter of the through hole 34b of the first facing portion 34, and the collar 32 is fitted so as to be movable in the axial direction with respect to the through hole 34b of the first facing portion 34. Or it is lightly press-fitted. Therefore, the movement (rattling) of the collar 32 in the radial direction is suppressed inside the through hole 34b of the first facing portion 34.
- a flange 62 is provided at the end of the collar 32 on the side facing the fixed arm 12a (arrow Z1 side).
- the flange 62 is arranged between the inner side surface 34a of the first facing portion 34 and the fixing arm 12a (insulating plate 42).
- the outer diameter of the flange 62 is larger than the outer diameter of the collar 32 and the diameter of the through hole 34b of the first facing portion 34.
- the axial length of the collar 32 is longer than the axial length of the through hole 34b of the first facing portion 34. Therefore, the end portion of the collar 32 on the side opposite to the flange 62 in the axial direction protrudes to the outside of the laminated portion 40 (arrow Z2 side) through the through hole 34b of the first facing portion 34.
- the collar 32 is passed through the spring washer 64 and the flat washer 66. It is possible to bring the nut 30 into contact with the end on the side of the arrow Z2.
- the contact surface 62a which is the surface of the flange 62 on the arrow Z1 side, abuts on the held portion 19 of the fixed arm 12a with the insulating plate 42 interposed therebetween.
- the held portion 19 of the fixed arm 12a pressed in the direction of the arrow Z1 through the contact with the contact surface 62a abuts on the inner side surface 36a of the second facing portion 36 with the insulating plate 44 interposed therebetween. That is, by tightening the tightening mechanism 27, the held portion 19 of the fixed arm 12a is sandwiched between the contact surface 62a of the flange 62 and the inner side surface 36a of the second facing portion 36, and the held portion 19 is held. Is pressed toward the inner side surface 36a of the second facing portion 36.
- the back surface 62b of the contact surface 62a of the flange 62 is separated from the inner surface surface 34a of the first facing portion 34. That is, the distance between the inner side surfaces 34a and 36a of the first facing portion 34 and the second facing portion 36 is the thickness of the held portion 19 of the fixed arm 12a, the thickness of the two insulating plates 42 and 44, and the flange 62. It is set to be larger than the total value with the thickness of.
- the held portion 19 of the fixed arm 12a is sandwiched between the contact surface 62a of the flange 62 and the inner side surface 36a of the second facing portion 36.
- the flange As a result, the fixed arm 12a is held by the fixed side holding portion 14a.
- the holding portion main body 26 of the movable side holding portion 14b is made of a member separate from the mounting portion 16 and is swingably fixed to the mounting portion 16. Further, the movable side holding portion 14b holds the held portion 19 of the movable arm 12b instead of the held portion 19 of the fixed arm 12a. Except for these matters, the movable side holding portion 14b is basically configured in the same manner as the fixed side holding portion 14a. Therefore, with the description of the fixed side holding portion 14a in FIG. 3, the specific description of the movable side holding portion 14b in FIG. 4 will be omitted. It should be noted that each component of the movable side holding portion 14b in FIG. 4 is common to those corresponding to each component of the fixed side holding portion 14a in FIG. 3 (those having the same or similar functions and effects). A reference code is attached.
- the mounting portion 16 has a first mounting portion main body 67 and a second mounting portion main body (not shown).
- the first mounting portion main body 67 extends upward and rearward from the base end side of the first facing portion 34 (FIG. 3) of the fixed side holding portion 14a.
- the second mounting portion main body extends upward and rearward from the base end side of the second facing portion 36 (FIG. 3) of the fixed side holding portion 14a, similarly to the first mounting portion main body 67.
- the first mounting portion main body 67 and the second mounting portion main body face each other at predetermined intervals in the stacking direction (arrows Z1 and Z2 directions) of the laminated portion 40.
- the holding portion main body 26 of the movable side holding portion 14b is swingably fixed between the first mounting portion main body 67 and the second mounting portion main body.
- a first guide groove 68a and a second guide groove 68b extending in a predetermined direction are formed through the first mounting portion main body 67 and the second mounting portion main body in the directions of arrows Z1 and Z2. .
- a fastener 70 for connecting the movable side holding portion 14b and the mounting portion 16 is provided inside each of the first guide groove 68a and the second guide groove 68b. The fastener 70 is movable along the extending direction of the first guide groove 68a and the second guide groove 68b.
- the fastener 70 fixed to the movable side holding portion 14b is attached to the first guide groove 68a and the first guide groove 68a. 2 Move inside the guide groove 68b.
- the direction in which the movable side holding portion 14b moves relative to the mounting portion 16 (fixed side holding portion 14a) is guided.
- the resistance welding electrode 18a of the fixed arm 12a held by the fixed side holding portion 14a and the resistance welding electrode 18b of the movable arm 12b held by the movable side holding portion 14b can be moved in a direction of separating or approaching each other.
- the arm 12b can be swung.
- a shaft insertion hole 72 is formed on the rear end side of the first mounting portion main body 67 and the second mounting portion main body.
- the equalize shaft 74 is inserted into the shaft insertion hole 72.
- the welding gun 10 is attached to the tip arm of the robot by connecting the tip arm of the robot to the equalize shaft 74.
- the collar 32 inserted into the through hole 34b of the first facing portion 34 is set at a position where the back surface 62b of the flange 62 abuts on the inner side surface 34a of the first facing portion 34.
- the distance between the contact surface 62a of the flange 62 and the inner surface 36a of the second facing portion 36 can be made as large as possible.
- the laminated portion 40 is formed by interposing the held portion 19 of the fixed arm 12a and the insulating plates 42, 44 between the contact surface 62a of the flange 62 and the inner side surface 36a of the second facing portion 36. ..
- the through hole 34b of the first facing portion 34 (the insertion hole 32a of the collar 32), the through hole 36b of the second facing portion 36, the through holes 42a and 44a of the insulating plates 42 and 44, and the through holes of the held portion 19. 12c (hole portion of the insulating portion 52) is arranged so as to be coaxial.
- a through hole 46 that integrally penetrates the laminated portion 40 is formed in the laminated portion 40.
- the shaft portion 48 of the bolt 28 is inserted into the through hole 46 of the laminated portion 40 from the second facing portion 36 side toward the first facing portion 34 side, and the shaft portion 48 protrudes.
- the end portion 54 is projected from the first facing portion 34 side to the outside of the laminated portion 40.
- the head portion 50 of the bolt 28 is brought into contact with the periphery of the through hole 36b of the second facing portion 36 via the flat washer 58.
- the nut 30 is attached to the protruding end portion 54 of the bolt 28 via the flat washer 66 and the spring washer 64, and the bolt 28 and the nut 30 are relatively rotated to advance the screwing of the male screw 56 and the female screw 60. ..
- the nut 30 presses the end portion of the collar 32 via the flat washer 66 and the spring washer 64, so that the collar 32 moves axially in the through hole 34b of the first facing portion 34 and the fixing arm 12a. Close to the held portion 19.
- the held portion 19 of the fixing arm 12a is sandwiched between the contact surface 62a of the flange 62 and the inner side surface 36a of the second facing portion 36 with sufficient strength. Proceed with the screwing. As a result, the held portion 19 of the fixed arm 12a is held by the fixed side holding portion 14a.
- the held portion 19 of the movable arm 12b can be held by the movable side holding portion 14b in the same manner as the operation of holding the held portion 19 of the fixed arm 12a by the fixed side holding portion 14a. That is, as shown in FIG. 4, when the held portion 19 of the movable arm 12b is held by the movable side holding portion 14b, the held portion 19 of the second facing portion 36 and the movable arm 12b is held by tightening the tightening mechanism 27. And the collar 32 are tightened in the stacking direction. That is, the male screw 56 and the female screw 60 are screwed together until the held portion 19 is sandwiched between the contact surface 62a of the flange 62 and the inner side surface 36a of the second facing portion 36 with sufficient strength.
- the held portion 19 of the arm 12 held by the holding portion 14 relatively rotates the nut 30 and the bolt 28 in the direction in which the male screw 56 and the female screw 60 are unscrewed. It can also be removed from the holding portion 14. Therefore, for example, it is easy to remove the arm 12 from the holding portion 14 to perform maintenance on the arm 12 and the electrodes 18a and 18b for resistance welding, and to replace the arm 12 according to the type and shape of the work W. Is.
- the inside of the through hole 34b of the first facing portion 34 is along the axial direction (stacking direction of the laminated portion 40).
- the held portion 19 of the arm 12 is sandwiched between the movable collar 32 and the inner side surface 36a of the second facing portion 36. That is, the held portion 19 is pressed in the stacking direction toward the inner side surface 36a of the second facing portion 36 via the collar 32. Therefore, the inner side surface 36a of the second facing portion 36 and the held portion 19 of the arm 12 can be brought into contact with each other substantially in parallel to generate a good frictional force between them. As a result, the holding force of the held portion 19 by the holding portion 14 can be increased.
- the tightening mechanism 27 is used for tightening as described above, it is possible to avoid applying a force in the direction of approaching the first facing portion 34 and the second facing portion 36. Therefore, it is possible to suppress the generation of stress between the connecting portion 38 side of the first facing portion 34 and the second facing portion 36 and the other portion. As a result, the durability of the holding portion 14 can be improved. Therefore, according to this welding gun 10, the held portion 19 of the arm 12 can be firmly fixed by the holding portion 14, and the durability of the holding portion 14 can be improved. As a result, it is possible to suppress the positional deviation of the resistance welding electrodes 18a and 18b with respect to the welding target portion of the work W, so that the accuracy of resistance welding by the welding gun 10 can be improved.
- the shaft portion 48 of the bolt 28 is inserted into the through hole 46 of the laminated portion 40 from the second facing portion 36 side toward the first facing portion 34 side. It may be inserted into the through hole 46 of the laminated portion 40 from the facing portion 34 side toward the second facing portion 36 side. That is, the protruding end portion 54 of the shaft portion 48 of the bolt 28 may protrude to the outside (arrow Z1 side) of the laminated portion 40 through the through hole 36b of the second facing portion 36.
- the axial length of the collar 32 is longer than the axial length of the through hole 34b of the first facing portion 34.
- the end portion of the collar 32 on the arrow Z2 side protrudes to the outside of the laminated portion 40. Therefore, by relatively rotating the bolt 28 and the nut 30, the end portion of the collar 32 on the arrow Z2 side can be directly pressed, and the collar 32 can be moved with a simple configuration. Further, by adjusting the axial length of the collar 32 and the relative positions of the bolt 28 and the nut 30 by screwing the male screw 56 and the female screw 60, the collar 32 (flange 62) and the inner side surface 36a of the second facing portion 36 can be adjusted. The degree of pressing of the held portion 19 of the arm 12 can be easily adjusted.
- the axial length of the collar 32 may be shorter than the axial length of the through hole 34b of the first facing portion 34.
- a cylindrical portion (not shown) made of a member different from the collar 32 may be interposed between the nut 30 and the end portion of the collar 32 on the arrow Z2 side. That is, the held portion 19 of the arm 12 may be pressed against the inner side surface 36a of the second facing portion 36 via the cylindrical portion and the collar 32.
- the collar 32 is provided with a flange 62 at the end of the collar 32 facing the held portion 19, and the flange 62 has the held portion 19 having the second facing portion 36 and the collar 32. It is decided to have a contact surface 62a that presses the held portion 19 when it is sandwiched between the two. In this case, the held portion 19 of the arm 12 can be pressed against the inner side surface 36a of the second facing portion 36 via the contact surface 62a of the flange 62 having an area larger than the end surface of the collar 32. Therefore, the holding portion 14 makes it possible to more firmly fix the held portion 19 of the arm 12.
- the collar 32 has the arrow Z2 with respect to the through hole 34b of the first facing portion 34. It is prevented from coming off in the direction. This makes it possible to facilitate the handling of the holding portion 14.
- the back surface 62b of the contact surface 62a of the flange 62 is separated from the inner surface 34a of the first facing portion 34. ..
- the collar 32 is moved toward the arrow Z2 side in the through hole 34b of the first facing portion 34 to form the back surface 62b of the flange 62 and the inner side surface 34a of the first facing portion 34.
- the distance between the contact surface 62a of the flange 62 and the inner surface 36a of the second facing portion 36 can be made larger than the thickness of the arm 12.
- the held portion 19 of the arm 12 can be easily inserted between the contact surface 62a of the flange 62 and the inner side surface 36a of the second facing portion 36 to form the laminated portion 40. Further, the arm 12 can be easily pulled out from between the contact surface 62a of the flange 62 and the inner side surface 36a of the second facing portion 36.
- the insulating plate 42 that electrically insulates each other between the inner side surfaces 34a and 36a of the first facing portion 34 and the second facing portion 36 and the held portion 19. It was decided that 44 would be provided. In this case, when resistance welding is performed using the welding gun 10, it is possible to electrically insulate the holding portion main body 26 and the arm 12 with a simple configuration.
- both the fixed side holding portion 14a and the movable side holding portion 14b have the held portion 19 of the arm 12 via the collar 32 and the inner surface 36a of the second facing portion 36. It was decided to provide a configuration that presses against. However, only at least one of the fixed side holding portion 14a and the movable side holding portion 14b needs to have the above configuration. Further, in the welding gun 10 according to the above embodiment, only the movable side holding portion 14b is configured to be swingable with respect to the mounting portion 16 (fixed side holding portion 14a). However, the fixed side holding portion 14a may also be configured to be swingable with respect to the mounting portion 16.
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- Resistance Welding (AREA)
Abstract
Description
12c、34b、36b、46…貫通孔
14…保持部 18a、18b…抵抗溶接用電極
19…被保持部 27…締付機構
28…ボルト 30…ナット
32…カラー 32a…挿通孔
34…第1対向部 34a、36a…内側面
36…第2対向部 38…連結部
40…積層部 42、44…絶縁板
48…軸部 50…頭部
54…突出端部 56…雄ねじ
60…雌ねじ 62…フランジ
62a…当接面 62b…裏面
Claims (5)
- 抵抗溶接用電極(18a、18b)を有するアーム(12)に設けられた被保持部(19)を保持する保持部(14)を備える溶接ガン(10)であって、
前記保持部は、
前記被保持部を挟んで対向することで前記被保持部とともに積層部(40)を形成する第1対向部(34)及び第2対向部(36)と、
前記第1対向部及び前記第2対向部の前記被保持部に臨む内側面(34a、36a)同士の間隔が前記被保持部の厚さ以上となるように前記第1対向部及び前記第2対向部の相対位置を固定する連結部(38)と、
前記積層部を積層方向に貫通する貫通孔(46)と、
前記第1対向部の前記貫通孔の内部に前記積層方向に移動可能に挿入され、且つ前記第1対向部の前記貫通孔の軸方向と同軸に配置される挿通孔(32a)が設けられた中空状のカラー(32)と、
前記第2対向部の前記貫通孔、前記被保持部の前記貫通孔及び前記カラーの前記挿通孔に挿通されて、前記第2対向部、前記被保持部及び前記カラーを前記積層方向に締め付ける締付機構(27)と、
を有し、
前記締付機構の締め付けにより、前記被保持部が前記第2対向部と前記カラーとの間に挟持されて、前記被保持部が前記第2対向部の前記内側面に向かって押圧される、溶接ガン。 - 請求項1記載の溶接ガンにおいて、
前記カラーの軸方向の長さは、前記第1対向部の前記貫通孔の軸方向の長さよりも長い、溶接ガン。 - 請求項1又は2記載の溶接ガンにおいて、
前記カラーは、前記被保持部に臨む側の端部にフランジ(62)が設けられ、
前記フランジは、前記被保持部が前記第2対向部と前記カラーとの間に挟持される際に、前記被保持部を押圧する当接面(62a)を有する、溶接ガン。 - 請求項3記載の溶接ガンにおいて、
前記当接面が前記カラーを押圧するとき、前記フランジの前記当接面の裏面(62b)は、前記第1対向部の前記内側面と離間する、溶接ガン。 - 請求項1~4の何れか1項に記載の溶接ガンにおいて、
前記第1対向部及び前記第2対向部の前記内側面と、前記被保持部との間に、互いを電気的に絶縁する絶縁板(42、44)が設けられる、溶接ガン。
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PCT/JP2020/043480 WO2022107332A1 (ja) | 2020-11-20 | 2020-11-20 | 溶接ガン |
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JP3205788U (ja) * | 2016-06-03 | 2016-08-12 | デンゲン株式会社 | バランサの中継部構造とそれを備えたバランサ及び溶接機 |
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JPH05138365A (ja) * | 1991-11-26 | 1993-06-01 | Honda Motor Co Ltd | X型溶接ガン |
JP2560585Y2 (ja) * | 1992-08-17 | 1998-01-26 | 株式会社クボタ | バックホウの枢支部構造 |
JPH11245051A (ja) * | 1998-03-06 | 1999-09-14 | Honda Motor Co Ltd | 溶接ガンのスパッタカバー装置 |
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JP2004314131A (ja) * | 2003-04-17 | 2004-11-11 | Yashima:Kk | 抵抗溶接ガン |
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CN111609142A (zh) * | 2020-06-22 | 2020-09-01 | 江苏塔菲尔动力***有限公司 | 一种螺栓紧固密封结构及密封箱 |
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- 2020-11-20 JP JP2022563541A patent/JP7298032B2/ja active Active
- 2020-11-20 WO PCT/JP2020/043480 patent/WO2022107332A1/ja active Application Filing
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US20230405705A1 (en) | 2023-12-21 |
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