JP2007090427A - Chip forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chip forming apparatus which can secure dimensional accuracy of the apical surface including the edges of an electrode chip and can quickly form a pair of electrode chips usable while minimizing the production of swarf. <P>SOLUTION: The chip forming apparatus is equipped with a holder having a rotation axis O which coincides with the axis C of the electrode chips 6 coming close to each other and drives rotationally. The holder is provided with barrel-shaped forming rollers 52 and a cutter 48. As projection geometry in the orthogonal direction of an axis of retention which retains the forming rollers 52 rotatably and is along the rotation axis O, the forming face 53 of the forming rollers 52 comprises a main portion 54 which corresponds with the contour of an enlarged diameter part 6c of the electrode chip after formed, and an extended portion 55 which continues from the main portion 54 and overlaps with the rotating area between cutting blades 49 on both edges of the cutter 48 when rotating. The cutter 48 is provided with the cutting blades 49 which are shaped to plates having a thickness in the direction orthogonal to the rotation axis O of the holder and can cut excess part S of the chip material pushed out to the side of the extended portion 55 of the forming roller at the forming time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a chip molding machine that molds a pair of electrode chips for spot welding held by a welding gun so that cutting scraps are reduced as much as possible.

Conventionally, in a tip molding machine that forms an electrode tip for spot welding so that it can be used without performing cutting operations that generate cutting waste as much as possible, the tip of the electrode tip is pressed against three forming rollers that rotate. There was one that molded electrode tips (see Patent Document 1). In this chip molding machine, a support material having a polishing surface for polishing the tip surface of the electrode chip is disposed between the three molding rollers. In this chip molding machine, while the three molding rollers are rotated, the tip side of the electrode chip is pressed against the center side of the rotating molding roller to be molded and polished with three support materials. The electrode tip can be formed without removing it from the welding gun. Further, since the three support materials for polishing are arranged so as to be able to support the electrode chip among the three forming rollers for forming the electrode chip, the amount of the electrode chip by the support material is scraped. Can be formed without performing as much cutting work as possible to produce cutting waste.
JP 2003-80373 A

  However, the tip of the electrode tip is usually in contact with the workpiece during welding, the tip of the circular area that contacts the workpiece during welding, and the shape of the tip even if the tip is worn.・ In order to suppress the change of the area as much as possible, it is configured with a diameter expanding part that expands from the edge of the tip surface to the cylindrical base part side, and at the time of molding, it is only near the center of the circular tip surface In addition, it is important to secure the shape of the edge of the tip surface, which is a boundary portion with the enlarged diameter portion of the tip surface.

  The chip forming machine using the conventional molding roller has three supporting members for polishing, but each of the three supporting members supports the electrode chip between three identically shaped molding rollers. Therefore, the chip is mainly supported, and only a very small amount of chip material can be removed. For this reason, in this conventional chip forming machine, the electrode tip is molded so that it can be used by plastic deformation of the electrode tip by the forming roller. There was room for improvement in terms of securing the shape and molding time.

  The present invention solves the above-mentioned problems, and can ensure the dimensional accuracy of the tip surface including the edge, and can form a pair of electrode chips quickly so as to reduce cutting waste as much as possible. An object is to provide a molding machine.

The tip forming machine according to the present invention is held by a welding gun so as to be close to each other for spot welding, and a tip surface of a circular area to be brought into contact with a workpiece at the time of welding, and a tip surface, respectively. A tip forming machine that molds a pair of electrode tips that can be used, including a diameter-expanding portion that expands from the edge of the cylindrical portion toward the cylindrical base portion,
A holder having a rotation center axis that coincides with the axis center of the electrode tips that are close to each other, and a rotationally driven holder;
Around the rotation center axis of the holder, it is held by the holder so as to be rotatable around a holding axis along the rotation center axis, and is pressed against the approaching electrode tip during rotation of the holder, so that each enlarged diameter portion A plurality of barrel-shaped molding rollers having molding surfaces that can be molded on both end sides along the rotation center axis;
One cutter having a cutting edge held by the holder and capable of cutting the vicinity of the tip surfaces of the electrode tips when the holder rotates,
Configured with
The cutter has a plate shape with the thickness direction arranged in the direction perpendicular to the rotation center axis of the holder, and the cutting edge is cut between the tip surface of the electrode tip and the edge near the tip surface of the enlarged diameter portion during rotation. It is possible to dispose the electrode tips through the rotation center axis of the holder in a direction orthogonal to the rotation center axis of the holder so as to extend from the vicinity of the axis center in the projection state of the electrode orthogonal direction to one side of the axis orthogonal direction. , Disposed on both edge sides in the direction along the rotation axis,
The forming surface of at least one forming roller extends from the main body portion to the center side along the axial direction of the holding shaft and rotates from the main body portion to the front portion of the edge of the tip surface in the area of the enlarged diameter portion. An extension portion that overlaps the rotation area between the cutting edges of both edges of the cutter at the time,
In the projected shape of the cutter cutting blade and the forming roller in the direction orthogonal to the rotation center axis during rotation of the holder, the part of the cutter blade that cuts the electrode tip is from the rotation center axis to the forming surface of the forming roller. Up to the boundary between the body part and the extension part in
The holder is provided with a discharge hole through which a chip at the time of cutting of the electrode tip can be discharged along the rotation center axis on the rotation direction side of the cutting blade along the rotation direction of the cutter. And

  In the chip molding machine according to the present invention, while rotating the holder, the pair of electrode chips held by the welding gun are brought close to each other so as to be inserted into the holder and pressed against the molding roller and the cutter. Then, the molding roller rotates together with the holder in the direction around the axis of the electrode tip, and presses the molding surface against the enlarged diameter portion of the pair of electrode tips, so that the enlarged diameter portion of the electrode tip is formed according to the shape of the molding surface. The cutter is formed by cutting the tip surface of the electrode tip and the vicinity of the edge in the vicinity of the tip surface of the enlarged diameter portion continuous from the tip surface with a cutting blade.

  At that time, the molding surfaces on both ends of at least one molding roller extend to the center side along the axial direction of the holding shaft beyond the boundary portion with the main body portion, and between the cutting edges on both edges of the cutter during rotation. And an extended portion that overlaps a rotation region for cutting the chip. Therefore, when the molding surface of this molding roller is molded while plastically deforming the enlarged diameter portion of the electrode tip, the excess material of the chip material generated at the time of plastic deformation is extruded from the main body portion that molds the enlarged diameter portion to the extension portion. Then, the extruded surplus is cut by the cutter blade, and the tip side of the electrode tip, that is, the tip surface and its edge can be accurately formed into a predetermined shape.

  In addition, only one cutter is used and arranged at one place between a plurality of forming rollers, and the cutter blades are in the direction perpendicular to the axis from the vicinity of the axial center of each electrode tip in the projected state in the direction perpendicular to the axis. Is disposed through the rotation center axis of the holder in a direction orthogonal to the rotation center axis of the holder so as to extend to one side of the holder, and is disposed on both edge sides in the direction along the rotation center axis. It is only arranged to cut the surplus of the chip material extruded from the main body part to the extension part from the main body part on the molding surface of the roller, so that the molding by the molding surface of the molding roller is hindered. Since the electrode tip is not supported, the vicinity of the tip surface of the electrode tip can be cut quickly.

  In addition, although the tip surface side at the tip of the electrode tip is cut at the time of molding, most of the enlarged diameter portion is not cut, so that generation of cutting waste can be suppressed as much as possible, that is, the electrode tip The electrode tip can be molded while suppressing the amount of consumption.

  Of course, the chips when cut by the cutter blade are smoothly dropped and discharged from the discharge hole provided in the holder, so that the chips are prevented from being scratched, and after forming, the electrode The chip can ensure a clean and highly accurate cutting surface.

  Therefore, in the chip molding machine according to the present invention, the dimensional accuracy of the tip surface including the edge can be secured, and the generation of cutting waste is suppressed as much as possible, and the pair of electrode chips can be quickly formed (regenerated). be able to.

  And as a chip molding machine, using two molding rollers, the holding shafts of the two molding rollers and the cutting blade of the cutter are arranged 120 ° apart from each other around the rotation center axis of the holder, You may comprise so that a cutter and two shaping | molding rollers may be hold | maintained at a holder.

  In such a configuration, the pair of electrode chips being molded are equally spaced apart by 120 ° around the rotation center axis of the holder, and come into contact with the cutting edge of the cutter and the molding surface of the two molding rollers. It can be supported stably as three points are supported at the site, ensuring the dimensional accuracy to regenerate the tip surface including the edge of the electrode tip to be molded, and suppressing the blurring of the electrode tip efficiently Can be molded.

  Furthermore, as a chip molding machine, three or more molding rollers having an extended portion on the molding surface may be arranged substantially radially around the rotation center axis of the holder. In such a configuration, The electrode tip at the time of molding is supported by three or more molding rollers arranged substantially radially around the rotation center axis of the holder, and is further stably supported without being shaken. The dimensional accuracy for reproducing the tip surface including the edge can be further improved.

  The extending portion of the forming roller may extend away from the enlarged diameter portion and may be disposed so as to enter the rotation region between the cutting edges on both edges of the cutter during rotation, or may be expanded. While extending to the front side of the edge of the tip surface in the region of the diameter portion, it may be arranged so as to coincide with the rotation regions of the cutting blades on both edges of the cutter during rotation.

  By the way, if the extension part of the forming roller extends away from the enlarged diameter part and enters the rotation area between the cutting edges of both edges of the cutter during rotation, In the region of the electrode tip along, the portion corresponding to the extended portion is not a molding region by the molding roller, but a region where the tip material is easily extruded and a cutting region by the cutter. Efficiency is improved, and further rapid processing of chip molding (regeneration) is possible.

  In addition, when the extended part of the forming roller is arranged so as to extend to the front part of the edge of the tip surface in the area of the enlarged diameter part in alignment with the rotation area of the cutting blades on both edges of the cutter during rotation In the region of the electrode tip along the axis, the portion corresponding to the extended portion becomes the forming region by the extending portion of the forming roller and also becomes the cutting region by the cutter, so that it continues from the forming region to the cutting region. Therefore, it is possible to obtain an enlarged portion having a beautiful surface.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A chip forming machine M1 according to a first embodiment, as shown in FIGS. 1 and 3, is a pair of fittings fitted into shanks 3 and 4 of a welding gun 1. The electrode tip 6 (6A, 6B) is formed. The welding gun 1 is a servo gun that is held at the tip of an arm of a multi-joint welding robot (not shown). This servo gun 1 is a general-purpose one, and a pair of electrode tips 6A and 6B are connected to an encoder. It is configured to have a position control function for holding and moving the built-in servo motor 2 so as to approach each other. Further, the servo gun 1 has a calculation function, and can perform position control and pressure control of the electrode tips 6A and 6B by performing rotation speed control and torque control of the servo motor 2. .

  The electrode tips 6A and 6B have a circular tip end surface 6a and a diameter-expanded portion whose diameter increases from the edge (corner portion) 6b of the tip surface 6a to the columnar base portion 6d side. 6c. In the case of the first embodiment, the distal end surface 6a is a substantially planar spherical surface with a radius R1 of 40 mm, the enlarged diameter portion 6c is a spherical surface with a radius R2 of 8 mm, and the diameter d of the distal end surface 6a is 6 mm. The diameter D on the side of the base portion 6d is 16 mm (see FIG. 3).

  The chip molding machine M1 is disposed within the operating range of the servo gun 1 by the operation of the welding robot, and as shown in FIGS. 1 to 3, the support frame 10, the guide block 14, the gear case 16, the drive motor 22, and the molding A main body portion 26 is provided.

  Brackets 11 and 12 are disposed on the upper and lower sides of the support frame 10 disposed within the operating range of the servo gun 1. Between the upper and lower brackets 11 and 12, guide rods 13 and 13 are arranged on the left and right sides along the vertical direction. A guide block 14 disposed in the horizontal direction is disposed at a substantially intermediate position above and below each guide rod 13 so as to be slidable in the vertical direction along the axial direction of the guide rod 13 at a position on the base side. ing. Further, a total of four compression coil springs 15 that are sheathed around each guide rod 13 are in contact with the upper and lower surfaces of the base portion side of the guide block 14. By the expansion and contraction of these springs 15, the guide block 14 is held by the support frame 10 so as to be movable following the movement of the electrode tips 6A and 6B in the axial direction during molding.

  A gear case 16 composed of upper and lower upper plates 18 and a lower plate 19 is disposed on the distal end side of the guide block 14, and bearings 20 and 20 are interposed between the distal end plates 18 and 19 to form a molded body. A rotating base 27 of the part 26 is disposed. The upper surface side and the side surface side of the upper plate 18 are covered with a cover 17.

  A drive motor 22 capable of rotating the rotary base 27 is disposed on the lower surface of the base portion side of the gear case 16. In the drive motor 22, a gear 23 that meshes with the gear 24 is disposed on the drive shaft 22 a, and the gear portion 29 of the rotating base 27 is meshed with the gear 24.

  As shown in FIGS. 2 to 5, the molding main body 26 includes a holder 32 and a rotating base 27 that holds the holder 32. The holder 32 includes an upper cover 33, a lower cover 35, and a holder body 41, and holds a cutter 48, a forming roller 52, and a forming roller 58.

  As shown in FIGS. 2 to 5, the rotary base 27 includes a cylindrical portion 28, and a gear portion 29 that protrudes in a disk shape on the outer peripheral surface of the cylindrical portion 28 and meshes with the gear 24. Yes. The rotary base 27 that holds the holder 32 is configured to transmit the driving force of the driving motor 22 through the gears 23, 24, and the gear portion 29, and to rotate the rotation center axis O. The axis C of the electrode tips 6A and 6B at the time of molding. Are arranged so as to coincide with each other. The cylindrical portion 28 is disposed so that its axial direction is along the vertical direction and its axial center is aligned with the rotation center axis O. The rotary base 27 is rotatably supported by the gear case 16 with bearings 20 and 20 disposed on the outer peripheral surfaces of the upper and lower cylindrical portions 28 of the gear portion 29. The rotation direction of the rotation base 27 is the circumferential direction (direction around the axis) of the axis C of the chips 6A and 6B at the time of molding. In the case of the first embodiment, as shown in FIG. Rotates counterclockwise. Of course, the holder 32 held on the rotary base 27 rotates counterclockwise around the rotation center axis O coinciding with the rotary base 27.

  Furthermore, the cylindrical portion 28 is configured to include a through hole 28a having an oval opening on the inner peripheral side, and a disc-shaped upper cover 33 can be fitted to the periphery of the through hole 28a on the upper end surface. A concave groove 28b is formed. A screw hole (not shown) for fastening a screw 30 (see FIG. 2) for fixing the holder 32 to the rotary base 27 is formed on the bottom surface of the concave groove 28b.

  As shown in FIGS. 2 to 4 and 6, the upper cover 33 is formed in an annular shape having a circular opening insertion hole 33 a at the center, and the holder 32 is fixed to the molding body 26 at two locations on the outer peripheral edge. A mounting hole 33b through which the screw 30 is inserted is disposed. Around the insertion hole 33a, a connecting hole 33c penetrating in the vertical direction is disposed at two locations, and a meat stealing hole 33d penetrating in the vertical direction is disposed at four locations. Further, around the insertion hole 33a, two shaft support holes 33e and 33f and one fitting hole 33g are formed penetrating in the vertical direction.

  As shown in FIGS. 2 to 4 and 6, the lower cover 35 is formed in a substantially annular shape having a circular opening insertion hole 35 a at the center, and penetrates the insertion hole 35 a vertically in two places. The connecting holes 35c are arranged, and the meat stealing holes 35d penetrating in the vertical direction are arranged at four locations. Further, around the insertion hole 35a, two shaft support holes 35e and 35f and one fitting hole 35g are formed penetrating in the vertical direction.

  When the electrode tips 6A and 6B are molded, the insertion holes 33a and 35a have their axial centers aligned with the axis C of the electrode tips 6A and 6B at the time of molding, and the inner diameter dimension X (see FIG. 3) is set a predetermined number of times. In order to ensure that the deformed tips 6A and 6B can be inserted through the welding operation, the base portion 6d of the tips 6A and 6B at the time of molding can be supported by the inner peripheral surfaces of the holes 33a and 35a. The size approximates the outer diameter D of 6d (X = D + 0.5 to 1.5 mm). In the case of the first embodiment, the inner diameter dimension X is 16 mm + 1 mm, which is 17 mm.

  Further, the two connecting holes 33c and 35c of the upper cover 33 and the lower cover 35 are arranged at positions that coincide with each other along the axis C of the chips 6A and 6B at the time of molding, A screw 40 (see FIGS. 2 and 5) fastened to the screw hole 41a of the holder body 41 is inserted. These screws 40 are arranged to integrally form the holder 32 by fixing the upper cover 33 and the lower cover 35 to the upper and lower surfaces of the holder body 41.

  Further, the shaft support holes 33e and 35e of the upper cover 33 and the lower cover 35 are aligned with each other along the axis C of the chips 6A and 6B at the time of molding so that both ends of the holding shaft 37 are fitted. It is arranged. Further, the shaft support holes 33f and 35f of the upper cover 33 and the lower cover 35 are located at the same positions along the axis C of the chips 6A and 6B at the time of molding so that both ends of the holding shaft 38 are fitted. It is arranged. The holding shaft 37 holds the forming roller 52 so as to be rotatable in the direction around the axis, and the holding shaft 38 holds the forming roller 58 so as to be rotatable in the direction around the axis.

  Furthermore, the fitting holes 33g and 35g between the upper cover 33 and the lower cover 35 are located at the same positions along the axis C of the chips 6A and 6B at the time of molding so as to fit both ends of the positioning pins 39. Arranged.

  As shown in FIGS. 3 to 6, the holder main body 41 has storage recesses 42 that are recessed so that the tip sides of the chips 6 </ b> A and 6 </ b> B at the time of molding can be stored. Furthermore, a screw hole 41a for fastening each screw 40 and a fitting insertion hole 41b for inserting the positioning pin 39 are disposed in the holder body 41 so as to penetrate in the vertical direction.

  Further, the holder main body 41 is provided with a disposing hole 43 for disposing the cutter 48 in the vertical direction, including the region of the storage recess 42. The cutter 48 arranged in the arrangement hole 43 is attached to the holder main body 41 by screws 50 using an attachment hole 44 (see FIGS. 5 and 6) formed in a direction orthogonal to the rotation center axis O. Yes. The attachment hole 44 passes through the attachment hole 48d (see FIGS. 6 and 7) of the cutter 48, a screw hole 44a for fastening the shaft portion 50b of the screw 50, an insertion hole 44b for inserting the head portion 50a of the screw 50, It is composed of

  In addition, the holder main body 41 includes an area of the storage recess 42, and two storage holes 45 and 46 (see FIGS. 5 and 14) that are opened in a substantially fan shape are vertically penetrated. A forming roller 52 is stored in the storage hole 45, and a forming roller 58 is stored in the storage hole 46. Further, the storage hole 45 is disposed so as to expose the portion of the cutting edge 49 of the cutter 48, and the chip A (see FIGS. 3 and 14) when the chips 6A and 6B are cut by the cutter 48 is provided. It also plays a role as a discharge hole.

  As shown in FIGS. 3 and 6 to 9, the cutter 48 is provided with a thickness direction in a direction orthogonal to the rotation center axis O of the holder 32, and the width of the cutter 48 decreases as it approaches the rotation center axis O side. It is a base plate. The cutter 48 is capable of cutting the cutting edge 49 so that the tip surface 6a of the electrode tips 6A and 6B and the vicinity of the edge 6b in the vicinity of the tip surface 6a of the enlarged diameter portion 6c can be cut when rotating. It passes through the rotation center axis O of the holder in a direction orthogonal to the rotation center axis O of the holder 32 so as to extend from the vicinity of the axis C in the orthogonal projection state to one side in the axis orthogonal direction, and the rotation center axis O. Are arranged on both edges 48a and 48b in the direction along the line. In other words, the cutter 48 is formed by providing, on the upper and lower edges 48a and 48b side on the rotation center axis O side, projection-shaped concave portions 48e in the direction perpendicular to the axis C of the electrode tips 6A and 6B. Cutting edges 49 are provided on the edges 48a and 48b in the thickness direction. In addition, the cutter 48 is provided with an attachment hole 48d for fixing the screw 50 to the holder 32 in the vicinity of the center in the vertical direction away from the recess 48e, and the slit 48c is connected to the attachment hole 48d. It arrange | positions along the horizontal direction from the periphery. The slit 48c is provided so that the attachment hole 48d can be formed simultaneously with the processing of the outer peripheral edge of the cutter 48 when the cutter 48 is formed by a wire cutter.

  The recess 48e is formed so as to correspond to the area from the tip surface 6a of the chip 6 to the enlarged diameter portion 6c through the edge 6b. Furthermore, the length dimension (height dimension) L0 (see FIGS. 7 and 15) of the area formed in the arcuate shape corresponding to the enlarged diameter portion 6c in the cutting edge 49 is 3. Although the area is 416 mm, the actual area for cutting the tip 6 is an end surface portion 49 a for cutting the tip surface 6 a and an edge portion 49 b for cutting the vicinity of the edge 6 b in the enlarged diameter portion 6 c. It is not set to cut the entire area of 6c. In the case of the first embodiment, the cutting area of the tip 6 of the cutting edge 49 is set by adjusting the arrangement position with the molding rollers 52 and 58, and the area to be cut by the edge portion 49b is the tip 6 after the molding is completed. From the edge 6b, an area having a length dimension (height dimension) L1 (see FIG. 15) of 0.359 mm along the axis C enters the area of the enlarged diameter portion 6c. In addition, the end surface portion 49a for cutting the front end surface 6a side is formed on the side of the edge 48a, 48b in the plate thickness direction of the cutter 48, so that the end portion 49a extends from the edge portion 49b to the continuous rotation center axis O. In the area 49d that is an area and exceeds the rotation center axis O, the tip 6 cannot be cut because it contacts the tip 6 in the reverse rotation direction.

  The cutter 48 is formed such that the cutting blade 49 protrudes from the storage recess 42 when attached to the arrangement hole 43 of the holder body 41.

  As shown in FIGS. 4 to 6, 10, 11, 14, and 15, the forming roller 52 is rotatably held by a holding shaft 37 and is disposed in a storage hole (discharge hole) 45. Both ends of the holding shaft 37 are supported by the shaft support holes 33e and 35e of the upper cover 33 and the lower cover 35 which are fixed to the holder main body 41 with screws 40, and are arranged along the rotation center axis O. . The forming roller 52 is pressed against the approaching electrode tips 6A and 6B when the holder 32 is rotated, and has a forming surface 53 that can form each enlarged diameter portion 6c on both end sides along the rotation center axis O. It has a barrel shape. The molding surface 53 has a projected shape in the orthogonal direction of the holding shaft 37, the main body portion 54 corresponding to the outer shape of the enlarged diameter portion 6 c after the molding of the electrode tips 6 </ b> A and 6 </ b> B, and the main body portion 54. In order to move away from the portion 6c, while facing the center side in the axial direction of the holding shaft 37, it overlaps with the rotation region between the cutting edges 49 of both edges 48a and 48b of the cutter 48 during rotation (in the case of the first embodiment) (In order to enter the rotation region between the cutting blades 49) and an extended portion 55 that gradually approaches the rotation center axis O side of the holder 32. In the case of the first embodiment, the extension portion 55 extends in a tangential direction in the main body portion 54 as a projection shape in the orthogonal direction of the holding shaft 37, with the projection shape in the orthogonal direction of the holding shaft 37 being a straight line. It is arranged.

  The length L2 (see FIGS. 10 and 15) along the rotation center axis O of the extended portion 55 is 0.78 mm in the first embodiment.

  Further, the main body portion 54 on the molding surface 53 has an arc surface portion 54a of an arc surface corresponding to the radius R2 dimension of the enlarged diameter portion 6c of the tip 6 connected to the extension portion 55 as a projection shape in the orthogonal direction of the holding shaft 37. And a taper portion 54b extending linearly from the arc surface portion 54a to both ends of the roller 52. In the case of the first embodiment, the length dimension L4 along the rotation center axis O of the arc surface portion 54a of the main body portion 54 is 2.928 mm, and the length dimension L3 along the rotation center axis O of the taper portion 54b is 3.35 mm.

  The forming roller 58 has a smaller diameter than the forming roller 52 and forms the enlarged diameter portion 6c of the electrode tip 6. However, the forming roller 58 enters the rotation region (the cutting region of the length dimension L1) of the cutting blade 49 of the rotating cutter 48. It does not have an extension part, and mainly serves as a presser roller that supports the enlarged diameter portion 6c. As shown in FIGS. The storage hole 46 is rotatably held. Both ends of the holding shaft 38 are supported by the shaft support holes 33f and 35f of the upper cover 33 and the lower cover 35, which are fixed to the holder main body 41 with screws 40, and are arranged along the rotation center axis O. . The forming roller 58 is pressed against the approaching electrode tips 6A and 6B when the holder 32 is rotated, so that the forming surface 59 capable of forming a part of each of the enlarged diameter portions 6c has both ends along the rotation center axis O. It has a barrel shape on the side. The molding surface 59 is configured by providing a main body portion 60 corresponding to the outer shape of the enlarged diameter portion 6c after molding of the electrode tips 6A and 6B in the projected shape in the orthogonal direction of the holding shaft 37.

  In this molding roller 58 as well, the main body portion 60 has an arc surface portion 60a corresponding to the radius R2 of the enlarged diameter portion 6c of the chip 6 and linearly extending from the arc surface portion 60a to both ends of the roller 58. And a tapered portion 60b that extends. Incidentally, the length dimension along the rotation center axis O of the taper portion 60b is set equal to the length dimension L3 of the roller 52, and the length dimension L5 along the rotation center axis O of the arc surface portion 60a is the first dimension. In the case of the embodiment, it is 1.664 mm.

  Further, the height dimension H of the cutter 48 and the forming rollers 52 and 58 is equal to the dimension between the upper and lower covers 33 and 35 fastened to the holder body 41. In the case of the first embodiment, the height dimension is 20.0 mm. Yes.

  In the case of the first embodiment, as shown in FIG. 14, the holding shafts 37 and 38 of the forming rollers 52 and 58 and the cutting blade 49 of the cutter 48 are each 120 ° around the rotation center axis of the holder 32. Displaced and arranged. Of course, the shafts of the holding shafts 37 and 38 for holding the forming roller 52 and the forming roller 58 are arranged at the same radius RO (12.15 mm in the case of the first embodiment) from the rotation center axis O of the holder 32. The cutting blade 49 of the cutter 48 is disposed so as to pass through the rotation center axis O of the holder in a direction orthogonal to the rotation center axis O of the holder 32.

  Further, in the projected shape of the cutting blade 49 and the forming roller 52 in the direction orthogonal to the rotation center axis O when the holder 32 is rotated, as shown in FIG. 15, the upper end 49c of the edge portion 49b of the cutting blade 49 is The parts 49a and 49b of the cutting edge 49 of the cutter 48 for cutting the electrode tip 6 are arranged so as to coincide with the boundary part 53a between the main body part 54 and the extension part 55 on the molding surface 53 of the molding roller 52. From O to the boundary part 53a of the main-body part 54 and the extension part 55 in the molding surface 53 of the molding roller 52 are arrange | positioned.

  The usage state of the chip molding machine M1 of the first embodiment will be described. After performing spot welding a predetermined number of times, the welding robot places the servo gun 1 in the vicinity of the chip molding machine M1 and the electrode chips 6A and 6B. The upper and lower insertion holes 33a and 35a of the holder 32 are arranged so as to face each other along the vertical direction. Then, in response to this, the chip molding machine M1 drives the drive motor 22 to rotate.

  Then, the servo gun 1 is operated, and the chips 6A and 6B are brought close to each other so as to be inserted into the holder 32, and are pressed against the storage recess 42 side. Then, while the molding roller 52 rotates together with the holder 32 in the direction around the axis of the electrode tips 6A and 6B, the molding surface 53 is pressed against the enlarged diameter portion 6c of the pair of electrode chips 6A and 6B. The enlarged diameter portions 6c of the electrode tips 6A and 6B are formed in accordance with the shape of the main body portion 54, and the cutter 48 is formed by the end surface portion 49a and the edge portion 49b of the cutting blade 49, and the tip surfaces of the electrode tips 6A and 6B. 6a and the vicinity of the edge 6b in the vicinity of the tip surface 6a in the enlarged diameter portion 6c are cut and formed.

  At this time, the molding surface 53 on both ends of the molding roller 52 has a main body portion 54 corresponding to the outer shape of the enlarged diameter portion 6c after molding of the electrode tips 6A and 6B as a projected shape in the direction orthogonal to the axis of the holding shaft 37. Not only the boundary portion 53a with the main body portion 54 but also the center side along the axial direction of the holding shaft 37, and the chips 6A and 6B between the cutting blades 49 on both edges of the cutter 48 at the time of rotation are cut. An extending portion 55 that overlaps the rotating region. Therefore, when the molding surface 53 of the molding roller 52 is molded while plastically deforming the enlarged diameter portions 6c of the electrode tips 6A and 6B during molding, the chip material surplus S (see FIG. 15) generated during the plastic deformation is formed. Since the extruded portion S is extruded from the main body portion 54 to the extended portion 55 and the extruded surplus portion S is cut by the end face portion 49a and the edge portion 49b of the cutting blade 49 of the cutter 48, the tip side of the electrode tips 6A and 6B. That is, the tip surface 6a and the corner 6b of the edge can be accurately formed into a predetermined shape.

  That is, as shown in FIG. 15, as the rotation locus of the molding surface 53 with respect to the cutter 48, the upper end 49c of the edge portion 49b and the boundary portion 53a between the main body portion 54 and the extension portion 55 coincide with each other. The surplus material S of the chip material to be cut at the edge portion 49 b of the cutting edge 49 of the cutter 48 is pushed out from the main body portion 54 on the molding surface 53 of the molding roller 52 to the extension portion 55, and the length dimension along the rotation center axis O. It will be cut for L1 minutes.

  Further, only one cutter 48 is used and disposed at one place between the two forming rollers 52 and 58, and the cutting blade 49 of the cutter 48 is projected in the direction perpendicular to the axis of each electrode tip 6A and 6B. It is disposed through the rotation center axis O of the holder 32 in a direction orthogonal to the rotation center axis O of the holder 32 so as to extend from the vicinity of the axis C in the state to one side of the axis orthogonal direction. The chip material surplus S that is disposed on both edges 48a and 48b in the extending direction and is extruded from the main body portion 54 of the molding roller 52 over the boundary portion 53a to the extension portion 55 is formed. Since the electrode chips 6A and 6B are not disposed so as to be cut and do not support the molding of the molding surfaces 53 and 59 of the molding rollers 52 and 58 so as to hinder molding, the electrode chips 6A and 6B are not supported. The vicinity of the distal end surface 6a can be quickly cut.

  Of course, at the time of this molding, the tip surface 6a side at the tip of the electrode tips 6A and 6B is cut, but most of the enlarged diameter portion 6c is not cut, so generation of cutting waste can be suppressed as much as possible. In other words, the electrode tip 6 can be formed while suppressing the consumption of the electrode tips 6A and 6B.

  Then, the chips A cut by the cutting blade 49 of the cutter 48 are smoothly dropped and discharged from the discharge hole 45 provided in the holder 32 through the meat stealing hole 35d. Scratching by the powder A is prevented, and after forming, the electrode tips 6A and 6B can ensure a clean cutting surface with good dimensional accuracy.

  Therefore, in the chip molding machine M1 of the first embodiment, the dimensional accuracy of the tip surface 6a including the corner 6b of the edge can be ensured, and generation of cutting waste is suppressed as much as possible, and the pair of electrode chips 6A / 6B can be molded (regenerated) to be usable.

  Further, in the case of the first embodiment, the holding shafts 37 and 38 of the forming rollers 52 and 58 and the cutting blade 49 of the cutter 48 are arranged so as to be shifted by 120 ° around the rotation center axis O of the holder 32. The cutter 48 and the forming rollers 52 and 58 are held by the holder 32.

  For this reason, the pair of electrode chips 6A and 6B being formed are evenly separated by 120 ° around the rotation center axis O of the holder 32 to form the cutting blade 49 of the cutter 48, the forming surfaces 53 and 58 of the forming rollers 52 and 58, and so on. It is possible to stably support three points at the portion where the contact is made with 59, and the dimensional accuracy for reproducing the tip surface 6a including the corners 6b of the edges of the electrode tips 6A and 6B to be molded is improved. It can be ensured and the electrode tips 6A and 6B can be molded while effectively suppressing blurring.

  In the chip molding machine M1 of the first embodiment, the molding roller 58 may be changed to a molding roller 52 including a molding surface 53 having a main body portion 54 and an extension portion 55.

  Furthermore, in the first embodiment, the extension portion 55 of the forming roller 52 extends away from the enlarged diameter portion 6c and enters the rotation region between the cutting edges 49 of both edges 48a and 48b of the cutter 48 during rotation. In the region of the electrode tips 6A and 6B along the axis C, the portion corresponding to the extended portion 55, that is, the vicinity of the edge (corner portion) 6b in the enlarged diameter portion 6c, Since it does not become a molding area by the molding roller 52, it becomes an area where the chip material is easily pushed out and becomes a cutting area by the cutter 48, so that the cutting efficiency is improved and the chip molding (regeneration) is further improved. Rapid processing is possible.

  Incidentally, as in the first embodiment, in the case where the extended portion 55 of the molding surface 53 is disposed so as to enter the rotation region between the cutting edges 49 of both edges 48a and 48b of the cutter 48 during rotation. The length dimension of the enlarged diameter portion 6c to be cut at the edge portion 49b of the cutting edge 49 of the cutter 48 is too long, the cutting amount of the electrode tip 6 becomes large, and if it is too short, the length around the upper end 49c of the edge portion 49b is increased. Since the remaining protrusion S of the surplus S is generated in the enlarged diameter portion 6c near the upper side, the length L1 (from the end surface portion 49a of the cutting edge 49 cutting the tip end surface 6a of the cutter 48, The height dimension of the forming surface 53 of the forming roller 52 to the boundary portion 53a between the main body portion 54 and the extension portion 55 is 0.1 to 0.8 mm, preferably 0.2 to 0.5 mm. Preferred to set .

  Further, three or more molding rollers having an extension portion on the molding surface may be disposed substantially radially around the rotation center axis of the holder. In the chip molding machine M2 of the second embodiment shown in FIGS. As such, four forming rollers 92 may be used. In the chip molding machine M2 of the second embodiment, unlike the holder 32 of the first embodiment, the holder 72 of the molding main body 26A holds the four molding rollers 92, and the electrode chip 66 (FIG. 20) is slightly different from the electrode tip 6 of the first embodiment. In the chip forming machine M2, as in the first embodiment, the support frame 10, the guide block 14, the gear case 16, the drive motor 22, and the support frame 10, which are disposed within the operating range of the servo gun 1 by the operation of the welding robot, The molded body 26A is configured (see FIG. 1), and is the same as that of the first embodiment except for the above-described differences. The same parts and members as those of the first embodiment include the first The same reference numerals as those in the embodiment are given, and the description is omitted.

  The electrode tip 66 (66A / 66B) to be formed (reproduced) in the second embodiment has a tip surface 66a having a circular area on the tip side to be brought into contact with the workpiece during welding, and an edge (corner) 66b of the tip surface 66a. And a diameter-expanding portion 66c that expands from the columnar base portion 66d side. In the case of the second embodiment, the distal end surface 66a is a substantially planar spherical surface with a radius R1 of 30 mm, the enlarged diameter portion 66c is a spherical surface with a radius R2 of 7.9 mm, and the diameter d of the distal end surface 66a is the same. It is 5.9 mm, and the diameter D on the side of the base portion 66d is 16 mm (see FIG. 21).

  As shown in FIGS. 16 to 19, the molded main body portion 26 </ b> A includes a holder 72 and a rotation base 27 that holds the holder 72. The holder 72 includes an upper cover 73, a lower cover 75, and a holder main body 81, and holds a cutter 88 and four forming rollers 92. The rotary base 27 includes a cylindrical portion 28 and a gear portion 29 that protrudes in a disk shape on the outer peripheral surface of the cylindrical portion 28 and meshes with the gear 24. As in the first embodiment, the rotary base 27 that holds the holder 72 has a rotation center axis O that rotates by transmitting the driving force of the drive motor 22 through the gears 23, 24, and the gear portion 29. It is arranged so as to coincide with the axis C of the chips 66A and 66B, and the rotation direction is the circumferential direction (direction around the axis) of the axis C of the chips 66A and 66B at the time of molding. In the case of a form, as shown in FIG. 16, it rotates counterclockwise along the horizontal direction. Of course, the holder 72 held on the rotary base 27 rotates counterclockwise around the rotation center axis O coinciding with the rotary base 27. A screw 30 (see FIGS. 16 and 18) for fixing the holder 72 to the rotary base 27 is fastened to the bottom surface of the concave groove 28b in which the substantially cross-shaped plate-like upper cover 73 can be fitted. A screw hole 28c is formed.

  The upper cover 73 has an insertion hole 73a having a circular opening in the center, and mounting holes 73b through which screws 30 for fixing the holder 72 to the molded body 26A are inserted at two locations on the outer peripheral edge. ing. In the vicinity of the outer peripheral edge of the upper cover 73, there are four connecting holes 73c penetrating in the vertical direction, and in four positions on the outer peripheral edge shifted from the respective connecting holes 73c, there are penetrating in the vertical direction. A meat stealing hole 73d is provided. Further, the upper cover 73 is formed with four shaft support holes 73e penetrating in the vertical direction around the insertion hole 73a.

  In addition, the lower cover 75 has a circular opening insertion hole 75a in the center and has a plate shape that is the same shape as the upper cover 73 in a state where the vicinity of the attachment hole 73b is not provided. The lower cover 75 is provided with four connecting holes 75c penetrating in the vertical direction at four positions corresponding to the connecting holes 73c of the upper cover 73, and an outer peripheral edge corresponding to the meat stealing holes 73d of the upper cover 73. The meat stealing holes 75d penetrating in the vertical direction are disposed at the four locations (see FIG. 19). Further, around the insertion hole 75a, four shaft support holes 75e are formed penetrating in the vertical direction at positions corresponding to the shaft support holes 73e of the upper cover 73 (see FIG. 19).

  When the electrode tips 66A and 66B are formed, the insertion holes 73a and 75a have their axial centers aligned with the axis C of the electrode tips 66A and 66B at the time of molding, and the inner diameter dimension X (see FIG. 18) is set a predetermined number of times. The dimensions of the inserts 66A and 66B that are deformed by the welding operation are secured, and the base portions 66d of the tips 66A and 66B at the time of molding can be supported by the inner peripheral surfaces of the holes 73a and 75a. The size approximates the outer diameter D of 66d (X = D + 0.5 to 1.5 mm). In the case of the second embodiment, as in the first embodiment, the inner diameter dimension X is 16 mm + 1 mm, which is 17 mm.

  In addition, screws 80 (see FIG. 16) fastened to the screw holes 81a of the holder body 81 are inserted into the four connecting holes 73c and 75c of the upper cover 73 and the lower cover 75, respectively. 80, the upper cover 73 and the lower cover 75 are fixed to the upper and lower surfaces of the holder body 81.

  Furthermore, the shaft support holes 73e and 75e of the upper cover 73 and the lower cover 75 are fitted to both ends of a holding shaft 77 that rotatably holds the four molding rollers 92.

  The holder main body 81 is formed in a substantially elliptical cylindrical shape in which one storage hole 85 for storing four molding rollers 92 is vertically penetrated at a central position, and each screw 80 is fastened to an end surface. A screw hole 81a is formed at a predetermined position. In addition, around the storage hole 85, there are provided through holes 83 and 83 penetrating in the vertical direction for fitting and disposing both ends of the cutter 88 respectively. The storage hole 85 for storing the four molding rollers 92 also serves as a discharge hole for discharging the chips A (see FIG. 23) when the chips 66A and 66B are cut by the cutter 88.

  As shown in FIGS. 18, 20, and 21, the cutter 88 has a substantially drum-shaped plate shape in which a thickness direction is disposed in a direction orthogonal to the rotation center axis O of the holder 72. That is, the cutter 88 has a substantially drum-shaped plate shape in which recesses 88e that can accommodate the tip surfaces 66a of the electrode tips 66A and 66B and the enlarged diameter portions 66c are provided on both edges along the rotation center axis O of the holder 72. Yes. Then, the cutting edge 89 of the cutter 88 is capable of cutting the tip surface 66a of the electrode tip 66A / 66B and the vicinity of the edge 66b near the tip surface 66a of the enlarged diameter portion 66c during rotation so as to be orthogonal to the axis of each electrode tip 66A / 66B. Is arranged so as to extend from the vicinity of the axis C in the projected state of the direction to one side in the direction perpendicular to the axis, that is, only on one side away from the rotation center axis O of the holder 72 at the periphery of the recess 88e. The rotation center axis O of the holder passes through the rotation center axis O in a direction perpendicular to the rotation center axis O, and is arranged on both edges 88a and 88b in the direction along the rotation center axis O. In other words, the periphery of the recess 88e where the cutting edge 89 is not provided is configured by further providing a recess 88f that is further recessed in the vicinity of the rotation center axis O, and the periphery of the recess 88e on the recess 88f side is the electrode. A support surface 90 capable of supporting the enlarged diameter portions 66c of the chips 66A and 66B is used. The support surface 90 has the same outer shape as the projection shape of the main body portion 94 (projection shape in the direction perpendicular to the axis of the holding shaft 77 of the molding roller 92) on the molding surface 93 of the molding roller 92 during rotation described later.

  The cutting edge 89 includes an end surface portion 89a that cuts the tip end surface 66a of the electrode tip 66, and an edge portion 89b that cuts the vicinity of the edge 66b in the enlarged diameter portion 66c. From the terminal (upper end) 89c to the upper and lower end surfaces along the rotation center axis O in the cutter 88, a taper is formed so as to be linearly separated from the enlarged diameter portion 66c, and the entire area of the enlarged diameter portion 66c is cut. So that it is not set. In the case of the second embodiment, the cutting area of the tip 66 of the cutting edge 89 is set by adjusting the arrangement position of the molding roller 92, and the area to be cut by the edge 89b is the edge 66b of the chip 66 after completion of molding. Accordingly, an area is entered in the region of the enlarged diameter portion 66c along the axis C by a length dimension (height dimension) L1 (see FIGS. 20 and 24) of 1.743 mm. Further, the end face portion 89a for cutting the tip end face 66a side is formed on the edge 88a / 88b side of the cutter 88 in the thickness direction of the cutter 88. Therefore, the end face portion 89a extends from the edge portion 89b to the continuous rotation axis O. In the area 89d that is an area and exceeds the rotation center axis O, the tip 66 cannot be cut because it contacts the tip 66 in the reverse rotation direction. However, in the case where the end surface portion 89a is formed up to the position of the rotation center axis O without providing the cutting edge 89 so as to exceed the rotation center axis O, an uncut portion is provided at the center of the tip surface 66a of the tip 66. Since there is a possibility of causing it, it is desirable to form the end face part 89a so as to exceed the rotation center axis O as in the embodiment.

  Further, this cutter 88 is fitted to the mounting holes 83 and 83 of the holder main body 81 at both ends separated in the direction orthogonal to the rotation center axis O, and the upper and lower end surfaces along the rotation center axis O are covered with the upper cover. 73 and the lower cover 75 and is held by the holder main body 81.

  As shown in FIGS. 16, 17, 19, and 22, each forming roller 92 is rotatably held by a holding shaft 77 and is disposed in a storage hole (discharge hole) 85. The holding shaft 77 is arranged so that the both ends are supported by the shaft support holes 73 e and 75 e of the upper cover 73 and the lower cover 75 that are fixed to the holder main body 81 with screws 80 and along the rotation center axis O. . Each forming roller 92 is disposed at a substantially radial position shifted about 90 degrees around the rotation center axis O. In addition, each forming roller 92 is pressed against the electrode tips 66A and 66B that are close to each other when the holder 72 is rotated, so that the forming surfaces 93 that can form the respective enlarged diameter portions 66c are formed on both end sides along the rotation center axis O. It has a barrel shape. The molding surface 93 has a main body portion 94 corresponding to the outer shape of the enlarged diameter portion 66c of the electrode tips 66A and 66B after the projection shape in the orthogonal direction of the holding shaft 77, and an extension portion 95 connected to the main body portion 94. , And is configured. In the case of the second embodiment, the extended portion 95 extends to the front portion of the edge 66b of the distal end surface 66a in the area of the enlarged diameter portion 66c, and the edges of the cutting edge 89 at both edges 88a and 88b of the cutter 88 during rotation. It is arranged so as to be close to the rotation center axis O side of the holder 72 while being directed toward the center side in the axial direction of the holding shaft 77 so as to coincide with the rotation region near the upper end 89 c of 89 b. In the case of the second embodiment, the length L2 (see FIGS. 22 and 24) along the rotation center axis O of the extension portion 95 is 0.53 mm.

  Further, the main body portion 94 on the molding surface 93 has an arc surface portion 94a of an arc surface corresponding to the radius R2 dimension of the enlarged diameter portion 66c of the tip 66 as a projection shape in the direction perpendicular to the holding shaft 77. And a taper portion 94b extending linearly from the arc surface portion 94a to both ends of the roller 92. In the case of the second embodiment, the length dimension L4 along the rotation center axis O of the arc surface portion 94a of the main body portion 94 is 1.636 mm, and the length dimension L3 along the rotation center axis O of the taper portion 94b is 3.379 mm.

  Furthermore, the height dimension H between the cutter 88 and each forming roller 92 is equal to the dimension between the upper and lower covers 73 and 75 fastened to the holder body 81, and in the same way as in the first embodiment, 20.0 mm. It is said.

  And in the case of 2nd Embodiment, as shown in FIG. 23, the axial center of the holding shaft 77 holding each shaping | molding roller 92 is the same radius RO (in the case of 2nd Embodiment, from the rotation center axis O of the holder 72). The cutting edge 89 of the cutter 88 is arranged so as to pass through the rotation center axis O of the holder in a direction orthogonal to the rotation center axis O of the holder 72.

  Furthermore, in the projection shape of the cutting edge 89 and each forming roller 92 in the direction orthogonal to the rotation center axis O when the holder 72 is rotated, the upper end 89c of the edge 89b of the cutting edge 89 is as shown in FIG. The portions 89a and 89b for cutting the electrode tip 66 in the cutting edge 89 of the cutter 88 so as to coincide with the boundary portion 93a between the main body portion 94 and the extension portion 95 on the forming surface 93 of the forming roller 92 are the center of rotation. From the axis O to the boundary portion 93a between the main body portion 94 and the extension portion 95 on the molding surface 93 of the molding roller 92 are disposed.

  Even in the chip molding machine M2 of the second embodiment, when the drive motor 22 is operated and the servo gun 1 is operated in use, the chips 66A and 66B are inserted into the holder 72 so as to be close to each other. Each molding roller 92 rotates together with the holder 72 in the direction around the axis of the electrode tips 66A and 66B, and presses the molding surface 93 against the enlarged diameter portion 66c of the pair of electrode chips 66A and 66B. The diameter-expanded portions 66c of the electrode tips 66A and 66B are formed in accordance with the shape of the main body portion 94, and the cutter 88 is formed by the end surface portion 89a and the edge portion 89b of the cutting blade 89, and the tip surfaces of the electrode tips 66A and 66B. 66a and the vicinity of the edge 66b in the vicinity of the distal end surface 66a in the enlarged diameter portion 66c are formed by cutting.

  At this time, the molding surfaces 93 on both ends of each molding roller 92 have a main body portion corresponding to the outer shape of the enlarged diameter portion 66c after molding of the electrode tips 66A and 66B as a projected shape in the direction orthogonal to the holding shaft 77. In addition to the main body portion 94, it overlaps with the main body portion 94 so as to coincide with the rotation region between the cutting blades 89 on both edges of the cutter 88 at the time of rotation, gradually toward the central side in the axial direction of the holding shaft 77, An extension portion 95 that approaches the rotation center axis O side of the holder 72 is provided. Therefore, when the molding surface 93 of the molding roller 92 is molded while plastically deforming the enlarged diameter portions 66c of the electrode tips 66A and 66B during molding, the chip material surplus S (see FIG. 24) generated at the time of plastic deformation is formed. Since the extruded portion S is extruded from the main body portion 94 to the extension portion 95 and the extruded surplus portion S is cut by the end face portion 89a and the edge portion 89b of the cutting blade 89 of the cutter 88, the tip side of the electrode tips 66A and 66B. That is, the tip surface 66a and the corner portion 66b of the edge can be accurately formed into a predetermined shape.

  That is, also in this second embodiment, as shown in FIG. 24, the rotation path of the molding surface 93 with respect to the cutter 88 includes an upper end 89c of the edge 89b and a boundary portion 93a between the main body portion 94 and the extension portion 95. Therefore, the excess S of the chip material to be cut at the edge 89 b of the cutting edge 89 of the cutter 88 is pushed out from the main body portion 94 of the forming surface 93 of the forming roller 92 to the extension portion 95, and the edge portion It will be cut by 89b.

  Further, only one cutter 88 is used and disposed at one place between the four forming rollers 92, and the cutting edge 89 of the cutter 88 is projected in the direction perpendicular to the axis of each of the electrode tips 66A and 66B. Is disposed through the rotation center axis O of the holder 72 in a direction orthogonal to the rotation center axis O of the holder 72 and extends along the rotation center axis O so as to extend from the vicinity of the axis C to one side of the axis orthogonal direction. The chip material surplus S which is disposed on both edges 88a and 88b in the opposite direction and is extruded from the main body portion 94 on the molding surface 93 of the molding roller 92 beyond the boundary portion 93a to the extension portion 95 is cut. Since the electrode tips 66A and 66B are not supported so as to hinder the molding by the molding surface 93 of the molding roller 92, the tips of the electrode tips 66A and 66B are arranged. 66a vicinity can be quickly cut.

  Of course, at the time of this molding, the tip surface 66a side at the tip of the electrode tips 66A and 66B is cut, but most of the enlarged diameter portion 66c is not cut, so generation of cutting waste can be suppressed as much as possible. In other words, the electrode tip 66 can be molded while suppressing the consumption of the electrode tips 66A and 66B.

  Then, the chips A when being cut by the cutting blade 89 of the cutter 88 are smoothly passed through the meat stealing hole 75d from the rotation direction side portion of the cutting blade 89 of the discharge hole 85 provided in the holder 72. Since it falls and is discharged, it is prevented from being damaged by the chips A, and after forming, the electrode tips 66A and 66B can ensure a clean cutting surface with good dimensional accuracy.

  Therefore, also in the chip molding machine M2 of the second embodiment, the dimensional accuracy of the tip surface 66a including the edge corner portion 66b can be secured, and the generation of cutting waste is suppressed as much as possible, and the pair of electrode chips 66A can be quickly performed. 66B can be molded (regenerated) so that it can be used.

  Further, in the case of the second embodiment, the electrode tip 66 at the time of molding is a portion per line on the molding surface 93 of each of the four molding rollers 92 arranged substantially radially around the rotation center axis O of the holder 72. Therefore, the dimensional accuracy for reproducing the tip surface 66a including the edge 66b of the electrode tip 66 to be molded can be further improved.

  In addition, it is desirable to use three or more molding rollers having a molding surface having an extended portion. As shown in FIGS. 25 and 26, the molding main body portion 26B is used so that three molding rollers 92 are used. It may be configured.

  In the second embodiment, the extending portion 95 of the forming roller 92 extends to the front portion of the edge 66b of the distal end surface 66a in the region of the enlarged diameter portion 66c, and the both edges 88a and 88b of the cutter 88 during rotation are cut. It is arranged so as to coincide with the rotation region of the blade 89. In such a configuration, in the region of the electrode tip 66 along the axis C, a portion corresponding to the extended portion 95 becomes a forming region by the extending portion 95 of the forming roller 92 and a cutting region by the cutter 88. Thus, the diameter-enlarged portion 66c having a clean surface can be obtained continuously from the forming region to the cutting region.

  In addition, regarding the length dimension (height dimension) L2 of the extension portion 95 of the second embodiment, if it is too long, the cutting area to be cut by the edge portion 89b of the cutting blade 89 of the overlapping cutter 88 is increased. If the cutting amount of the electrode tip 66 is too large and too short, the remaining portion S of the surplus cut S is generated in the enlarged diameter portion 66c near the upper end 89c of the edge 89b. The dimension (height dimension) L2 is preferably set to ensure 0.1 to 1.0 mm, desirably 0.2 to 0.7 mm. In this case, if the length dimension (height dimension) L1 of the area to be cut by the edge 89b of the cutting edge 89 of the cutter 88 is too short, it is difficult to secure the length of the extension portion 95 of the forming roller 92. If the length is too long, the amount of cutting of the electrode tip 66 increases, so it is preferable to secure 0.2 to 3.0 mm, preferably 0.5 to 2.0 mm.

  In the first and second embodiments, the end face portions 49a and 89a for cutting the tip end faces 6a and 66a of the cutting blades 49 and 89 of the cutters 48 and 88 are formed in a curved shape, but the tip end faces 6a and 66a are formed in a curved shape. If it is a flat surface, the end surface portion 89a may be linear.

It is a partial side view of the chip molding machine of a 1st embodiment concerning the present invention. It is a schematic plan view of the chip molding machine of 1st Embodiment. It is a schematic longitudinal cross-sectional view of the principal part of the chip molding machine of 1st Embodiment, and respond | corresponds to the III-III site | part of FIG. It is a schematic longitudinal cross-sectional view of the principal part of the chip molding machine of 1st Embodiment, and respond | corresponds to the IV-IV site | part of FIG. It is a schematic plan view of the shaping | molding main-body part in the chip molding machine of 1st Embodiment, and shows the state which removed the upper cover. It is a disassembled perspective view of the holder, cutter, forming roller, and presser roller in the chip forming machine of the first embodiment. It is a front view of the cutter used for 1st Embodiment. It is a side view of the cutter used for 1st Embodiment. It is a schematic fragmentary sectional view of the cutting blade of a cutter used for a 1st embodiment, and an electrode tip, and is a figure explaining the area which can be cut, and the area which cannot be cut. It is a front view of the forming roller used for a 1st embodiment. It is a top view of the forming roller used for a 1st embodiment. It is a front view of the other shaping | molding roller used for 1st Embodiment. It is a top view of the forming roller shown in FIG. It is a top view which shows the arrangement | positioning relationship with respect to the holder of the cutter and forming roller in 1st Embodiment. It is the figure which projected the cutting blade of the cutter at the time of shaping | molding in the chip molding machine of 1st Embodiment, and the shaping | molding surface of a shaping | molding roller to the axis orthogonal direction of the rotation center axis. It is a schematic plan view of the shaping | molding main-body part in the chip molding machine of 2nd Embodiment. It is a schematic plan view of the shaping | molding main-body part in the chip molding machine of 2nd Embodiment, and shows the state which removed the upper cover. It is a schematic longitudinal cross-sectional view of the principal part of 2nd Embodiment, and respond | corresponds to the XVIII-XVIII site | part of FIG. It is a schematic longitudinal cross-sectional view of the principal part of 2nd Embodiment, and respond | corresponds to the XIX-XIX site | part of FIG. It is a front view of the cutter used for 2nd Embodiment. It is a longitudinal cross-sectional view of the cutter used for 2nd Embodiment, and respond | corresponds to the XXI-XXI site | part of FIG. It is a front view which shows the forming roller used for 2nd Embodiment. It is a top view which shows the arrangement | positioning relationship with respect to the holder of the cutter and forming roller in 2nd Embodiment. It is the figure which projected the cutting edge of the cutter at the time of shaping | molding in the chip molding machine of 2nd Embodiment, and the shaping | molding surface of a shaping | molding roller to the axis orthogonal direction of the rotation center axis. It is a schematic plan view which shows the modification of 2nd Embodiment. FIG. 26 is a schematic plan view of the modification shown in FIG. 25 with the upper cover removed.

Explanation of symbols

1 ... (welding gun) servo gun,
6.66 (6A, 6B, 66A, 66B) ... electrode tip,
6a, 66a ... tip surface,
6b, 66b ... Rim, corner,
6c · 66c ... Diameter expansion part,
6d, 66d ... original part,
32.72 ... Holder,
48.88 ... Cutter,
49.89 ... cutting blade,
52, 58, 92 ... forming rollers,
53, 59, 93 ... molding surface,
54, 60, 94 ... body part,
55.95 ... extension part,
53a, 93a ... boundary part,
C ... axis of electrode tip,
O ... central axis of rotation (of the holder),
M1, M2 ... Chip molding machine.

Claims (5)

For spot welding, the tip is held by a welding gun so that the tips can approach each other, and the tip surface of a circular area to be brought into contact with the workpiece during welding on the tip side, and the columnar base from the edge of the tip surface A chip forming machine for forming a pair of electrode chips configured to include a diameter-enlarged portion that expands toward the side,
A holder that has a rotation center axis that coincides with the axial centers of the electrode tips that are close to each other, and that is driven to rotate;
Around the rotation center axis of the holder, the holder is held by the holder so as to be rotatable around a holding axis along the rotation center axis, and is pressed against the approaching electrode chip when the holder rotates. A plurality of barrel-shaped molding rollers having molding surfaces capable of molding each of the enlarged diameter portions on both end sides along the rotation center axis;
One cutter held by the holder and having a cutting blade capable of cutting the vicinity of the tip surfaces of the electrode chips when the holder rotates;
Configured with
The cutter has a plate shape in which a thickness direction is disposed in a direction perpendicular to the rotation center axis of the holder, and the cutting blade is rotated in the vicinity of the distal end surface of the electrode tip and the enlarged diameter portion when rotating. Rotation of the holder in a direction orthogonal to the rotation center axis of the holder so as to extend from the vicinity of the axial center of each electrode tip in the axial orthogonal direction projection state to one side in the axial orthogonal direction so that the edge of the electrode tip can be cut. Disposed through the central axis and disposed on both edges in the direction along the rotational central axis,
A molding surface of at least one of the molding rollers forms a main body portion that forms up to a front portion of an edge of the tip surface in the region of the enlarged diameter portion, and a central side along the axial direction of the holding shaft from the main body portion. Extending and overlapping the rotation area between the cutting edges of the two edges of the cutter during rotation,
In the projected shape of the cutter cutting blade and the forming roller in the direction perpendicular to the axis of rotation of the holder during rotation of the holder, a part of the cutter cutting blade that cuts the electrode tip is from the rotation center axis. To the boundary portion between the main body portion and the extended portion on the molding surface of the molding roller,
The holder has a discharge hole, which is capable of discharging chips during cutting of the electrode tip, penetrating along the rotation center axis on the rotation direction side of the cutting blade along the rotation direction of the cutter. A chip forming machine characterized by the above.   Two of the forming rollers are used, and the holding shafts of the two forming rollers and the cutting blade of the cutter are arranged around the rotation center axis of the holder by being shifted by 120 °, The chip forming machine according to claim 1, wherein the two forming rollers are held by the holder.   2. The chip molding machine according to claim 1, wherein three or more molding rollers each having the extension portion on the molding surface are arranged substantially radially around the rotation center axis of the holder.   2. The extension portion is disposed so as to extend away from the enlarged diameter portion so as to enter a rotation region between cutting edges on both edges of the cutter during rotation. The chip molding machine according to any one of claims 3 to 3.   The extended portion is disposed so as to extend to the front portion of the edge of the distal end surface in the area of the enlarged diameter portion in alignment with the rotation area of the cutting blades on both edges of the cutter during rotation. The chip molding machine according to any one of claims 1 to 3, wherein the chip forming machine is characterized in that:

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