KR100650636B1 - Chip moulder - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a chip molding machine which can form a pair of electrode chips in a usable manner by securing the accuracy of the front end surface including the corner portions of the edge portion without being removed from the welding gun.

In the chip forming machine, a pair of forming rollers 36 are installed side by side in the approach direction of the pair of electrode chips 6, and the holder 34 is rotatable by the support shaft 40 in the direction orthogonal to the approach direction, respectively. Is supported. The holder 34 is rotationally driven in the axial circumferential direction of the pair of chips 6 that are approached. The pair of rollers 36 are rotationally driven together with the holder, in a direction orthogonal to the support shaft 40 so that, when the pair of electrode chips 6 are pressed together, each of the chips 6 can be formed to be usable. The projection shape of is taken as the shape provided with the groove | channel 36c corresponding to the external shape of the front end side after chip shaping | molding. In addition, each roller 36 is comprised by the division body 38 divided into 2 parts along an axial direction. The divided surface 37 of the divided body is disposed at the center position of the tip surface 6a in the axial orthogonal direction of the chip.

Welding gun, electrode chip, chip forming

Description

Chip Forming Machine {CHIP MOULDER}

1 is a partial side view of a chip molding machine according to an embodiment of the present invention.

2 is a schematic plan view of a chip molding machine according to an embodiment.

3 is a vertical cross-sectional view of the main part of the chip molding machine according to the embodiment.

4 is a schematic plan view of a molding main body portion in the chip molding machine according to the embodiment;

5 is an exploded perspective view of the forming roller, the support shaft and the holder in the chip forming machine according to the embodiment.

6 is a partial sectional view showing a molding operation of the chip molding machine according to the embodiment.

7 is a view showing another embodiment of the forming roller.

*** Description of Major Reference Code ***

1: (Welding Gun) Servo Gun 6,6A, 6B: Electrode Chip

6a: end surface 6b: edge and corners

6c: diameter expansion part 6d: core part

31: guide member 31a: guide hole

34: holder 36,36A, 36B: forming roller

36c: groove 37,37A, 37B: split surface

38, 39A, 39B: Split 40: Support shaft

M: Chip Forming Machine

The present invention relates to a chip molding machine for forming a pair of spot welding electrode chips held in a welding gun so as to be usable without cutting chips inevitable.

A chip molding machine for forming a spot welding electrode chip without a polishing operation in which conventional cutting chips are generated has been configured with a die for regenerating the deformed tip by pressing and pressing (for example, See Japanese Patent Application Laid-Open No. 2004-167535 and Japanese Patent Application Laid-Open No. 2001-138065).

Such a chip molding machine is preferably used when spot welding is performed for a long time while suppressing the consumption of the electrode chip since the chip material consumes less as much as it is not cut compared to the case of cutting and polishing the electrode chip.

However, in the electrode chip, a tip portion in contact with a work during welding usually has a circular tip surface at the tip side, and a diameter-expansion portion whose diameter extends from the edge of the tip surface to the cylindrical wick portion side. In order to ensure the shape and area of the circular end face at the time of molding, it is important to secure the shape of each part of the edge of the end face, which is the boundary with the diameter-expanding part.

Therefore, in the conventional chip forming machine, the deformed tip of the electrode chip after welding a predetermined number of times is pressed into a die and pressed (regenerated) under a large pressure so as to plastically deform.

Therefore, in the conventional chip forming machine, it is necessary to remove the welding gun, so that the electrode chip cannot be regenerated while retained in the welding gun during the welding operation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a chip molding machine capable of forming a pair of electrode chips so that the accuracy of the tip surface including the corner portions of the edge can be used without being removed from the welding gun. For the purpose of

A chip molding machine according to the present invention is a chip molding machine for usable molding of a pair of spot welding electrode chips held in a welding gun,
Each electrode chip is provided with a tip end, a circular end face, and a diameter enlargement part whose diameter is expanded from the edge of the tip end face to the cylindrical wick side, respectively, and at the tip side, the welding guns being accessible to each other. Held in
A pair of forming rollers are installed side by side along the approach direction of the electrode chips, and are supported on the support shafts in directions perpendicular to the approach direction so as to be rotatable.
Each support shaft for supporting a pair of forming rollers is held in a holder that is rotationally driven in the axial circumferential direction of the pair of electrode chips that are approached.
When the pair of electrode chips are pressed together to approach each other while rotating the holder, the pair of forming rollers can be used to form the pair of electrode chips so as to be usable in a direction perpendicular to the respective support shafts. A projection divided into two parts along the axial direction, wherein the projection shape is a shape having grooves corresponding to the tip-side outer shape after electrode chip molding.
The divided surface of two divided parts divided into two parts is arrange | positioned in the area | region from the edge of the front end surface to the center position of a front end surface in the axial orthogonal direction of an electrode chip after shaping | molding.

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In the chip molding machine according to the present invention, the pair of electrode chips held in the welding gun while the holder is rotated is approached so as to be inserted into the holder and pressed by a pair of forming rollers. Then, the pair of forming rollers rotate around the support shaft while rotating in the direction of the axis of the electrode chip together with the holder, thereby forming the electrode chip in the shape of the groove.

At that time, each forming roller is formed of two divided bodies in which the dividing surface is arranged in the area from the edge of the tip surface to the center position of the tip surface in the axial orthogonal direction of the electrode chip after molding. The two divided parts forming the electrode are rotated in opposite directions to form an electrode chip front end face and an enlarged diameter part. And since at least one divided body can continuously and integrally shape each part vicinity from the tip surface of an electrode chip to the diameter expansion part through the edge of the tip surface, the tip side of an electrode chip, ie, a tip surface, Each part of the edge can be molded to a predetermined shape with high accuracy.

In addition, since the contact between the forming roller and the electrode chip is approximately linear contact in the state along the axial direction on the outer circumferential surface of the forming roller, the electrode chip is gradually gradually partially with a small pressure of approaching the electrode chips by the welding gun. Can be molded into a predetermined shape by plastic deformation.

In addition, even if the portion where the electrode chip is deformed at the time of forming is partial, increasing the number of rotations of the holder makes it possible to quickly form the entire front end side of the electrode chip.

Therefore, in the chip forming machine according to the present invention, without cutting off the welding gun, without cutting chips, the precision of the front end surface including the corner portions is ensured, and the pair of electrode chips can be quickly formed (regenerated). )can do.

And, it is preferable that the support shafts of the pair of forming rollers are arranged to cross each other in the orthogonal direction. That is, the shaping roller is a shape in which the projection shape in the orthogonal direction of the support shaft is provided with grooves corresponding to the tip shape of the electrode chip, and both end sides in the axial direction have a substantially long shape in which the diameter is enlarged. Is installed so that the support shafts cross each other in the orthogonal direction, the interference between the diameter-enlarging sides can be suppressed, so that the support shafts can be approached to each other, and the space to be installed side by side is reduced compared with the case where the support shafts are installed in parallel. It can reduce the volume of the holder. Therefore, when arrange | positioning a chip molding machine in a welding work place, it can arrange | position saving a space.

In addition, a guide having a guide hole in the vicinity of the holder which guides the pair of electrode chips when pressed against the pair of forming rollers and can restrict the electrode chip wick side from shaking in the axial orthogonal direction during molding. It is preferable to provide a member.

In such a configuration, when the dimension of the outer diameter of the forming roller is small, there is a fear that the electrode chip may deviate from the outer circumferential surface of the forming roller when the electrode chip is pressed, and this can be prevented by the guide member. That is, even if the dimension of the outer diameter of a shaping | molding roller is made small and a chip forming machine is set to save space, an electrode chip can be shape | molded smoothly.

(Example)

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 3, the chip forming machine M of the embodiment includes a pair of electrodes fitted to the shanks 3 and 4 of the welding gun 1. The chips 6, 6A and 6B are formed. The welding gun 1 is a servo gun held at the tip of a multi-joint welding robot arm (not shown). The servo gun 1 is a general-purpose, and a pair of electrode chips 6A and 6B have an encoder built therein. It is comprised by the servomotor 2 which was made to move, and is equipped with the position control function which mutually approaches. In addition, the servo gun 1 has an arithmetic function to control the rotation speed and torque of the servomotor 2 and to control the position, the pressing force, and the like of the electrode chips 6A and 6B.

In the electrode chips 6A and 6B, the tip portion contacting the workpiece at the time of welding has a circular tip surface 6a on the tip side and a cylindrical core from the edge (corner) 6b of the tip surface 6a. It is comprised with the diameter expansion part 6c which diameter extends over the branch part 6d side. In the case of the Example, the diameter enlargement part 6c is spherical shape, The diameter d of the front end surface 6a is 6 mm, and the diameter D of the circular part 6d side is 16 mm (refer FIG. 3).

The chip forming machine M is installed within the movable range of the servo gun 1 according to the operation of the welding robot, and as shown in FIGS. 1 to 3, the support frame 10, the guide block 14, and the gear case 16. ), A drive motor 22 and a molding main body 26.

Brackets 11 and 12 are provided above and below the support frame 10 provided within the movable range of the servo gun 1. Guide rods 13 and 13 are disposed between the upper and lower brackets 11 and 12 along the vertical direction on both the left and right sides. The guide block 14 provided in the horizontal direction is provided so that sliding in the up-down direction along the axial direction of the guide rod 13 is possible in the substantially intermediate position of the upper and lower sides of each guide rod 13. In addition, a total of four compression coil springs 15, which are externally wrapped around the guide rod 13, abut on the upper and lower surfaces of the guide block 14 base side. Due to the stretching force of the compression coil springs 15, the guide block 14 is held in the support frame 10 so that the guide block 14 is movable in the axial direction of the electrode chips 6A and 6B during molding.

A gear case 16 including upper and lower upper plates 18 and lower plates 19 is installed at the front end side of the guide block 14, and bearings 20 and 20 are interposed between the front end plates 18 and 19. The rotary substrate 27 of the molding main body 26 is provided. The upper or side surface of the upper plate 18 is covered by the cover 20.

A drive motor 22 capable of rotationally driving the rotary substrate 27 is provided on the lower side of the distal side of the gear case 16. In the drive motor 22, a gear 23 meshing with the gear 24 is provided on the drive shaft 22a, and the gear part 29 of the rotating substrate 27 is engaged with the gear 24.

The molding main body 26 has a pair of molding rollers 36, 36A and 36B, two support shafts 40 for supporting each roller 36 in a rotatable manner, and each support shaft 40 in a rotatable manner. It comprises a holder 34 for holding, two guide members 31 and 31 and a rotating substrate 27 for holding the holder 34.

As shown in Figs. 2 to 4, when the pair of electrode chips 6A and 6B are formed, the rotary substrate 27 has a cylindrical portion 28 in which an axial direction is arranged along the direction of approaching each other, and a cylindrical portion. The outer peripheral surface of the 28 is provided with the gear part 29 which protrudes in disk shape and engages with the gear 24, and is comprised. In the case of the embodiment, the cylindrical part 28 is arrange | positioned so that the axial direction may be up-down. The rotary substrate 27 is provided with bearings 20 and 20 on the outer circumferential surface of the cylindrical portion 28 above and below the gear portion 29, and is supported by the gear case 16 so as to be rotatable. The rotational direction of the rotary substrate 27 is the axial circumferential direction (axial circumferential direction) of the chips 6A and 6B during molding, and in the embodiment, along the horizontal direction with the chips 6A and 6B during molding as the rotational center. Will rotate.

The cylindrical portion 28 is provided with a through hole 28a having a square opening on the inner circumferential side, and the circular guide member 31 can be fitted to the circumferential edge of the through hole 28a in the upper and lower sections. Grooves 28b are formed.

As shown in Figs. 2 to 4, the guide member 31 is a round ring shape having a guide hole 31a having a circular opening in the center thereof, and the mounting member 34 can be mounted on the holder 34 in four places. It is comprised with the hole 32d. The internal diameter dimension X of the guide hole 31a (see FIG. 4) is a chip at the time of molding, while ensuring a dimension through which the chips 6A, 6B deformed by a predetermined number of welding operations can be inserted. It is set as the dimension (x = D + 0.5-1.2mm) approximating the outer diameter dimension D of the wick part 6d so that the wick part 6d of 6A, 6B can be supported by the inner peripheral surface 31b. . In the case of the embodiment, the inner diameter dimension X is 16 mm + 1 mm, which is 17 mm. The peripheral edge of the guide hole 31a is a tapered surface 31c which is inclined to fall toward the guide hole 31a so as to guide the chips 6A and 6B toward the guide hole 31a side.

As shown in Figs. 2 to 6, the holder 34 has a through hole 34a in the axial direction along the direction in which the chips 6A and 6B approach each other during molding (in the embodiment, along the vertical direction). The rectangular cylindrical shape is fitted into the through hole 28a of the cylindrical portion 28 of the rotating substrate 27. The through-hole 34a is a square opening, and the screw hole 34b which screw-fits the screw 32 for fixing the guide member 31 is provided in the upper-and-lower end surface of the holder 34 around it. The holder 34 is fitted to the through hole 28a, and the guide members 31 and 31 are fixed to the upper and lower end surfaces of the screw 32 to prevent it from falling out of the through hole 28a. The cylindrical portion 28 is to be mounted. The holder 34 rotates along the axis, i.e., in the horizontal direction, with the rotary substrate 27 at the time of the chip molding machine M being operated, with the chips 6A and 6B at the time of rotation as the center of rotation. .

Further, two pairs are provided on the peripheral wall of the holder 34 so as to be orthogonal to the axial direction of the through hole 34a so that the pairs are arranged side by side along the direction in which the chips 6A and 6B approach each other. That is, the two pairs of support holes 34c and 34d penetrate so as to be installed side by side in the vertical direction. Further, the pair of support holes 34c and the support holes 34d are arranged so that the axial directions are perpendicular to each other. On the other hand, the support holes 34c and 34c are arranged in series so as to face each other with the through hole 34a interposed therebetween, and support the support shaft 40 of the forming roller 36A so as to be rotatable. 34d and 34d are arranged in series so as to face each other with the through hole 34a interposed therebetween, so that the support shaft 40 of the forming roller 36B can be rotatably supported.

As shown in Figs. 3 to 6, the two support shafts 40 have a cylindrical shape, and are located between the portions of the support shafts 34c and 34d, that is, at the positions of the through holes 34a of the holder 34. And the pair of forming rollers 36, 36A, 36B are supported so as to be rotatable.

As shown in Figs. 2 to 6, the pair of forming rollers 36A and 36B has a substantially long shape, and the insertion hole 36a through which the support shaft 40 is inserted is penetrated in the axial direction. At both end surfaces of each of the rollers 36A and 36B, a cylindrical portion 36b having a small diameter is formed at the circumferential edge of the insertion hole 36a to reduce contact with the inner peripheral surface side of the through hole 34a of the holder 34. It is protruded.

The shape of the long rollers of the shaping rollers 36A and 36B is a post-molding chip 36c formed in a projection shape in the orthogonal direction of the support shaft 40 supporting the rollers 36A and 36B. Corresponding to the external shape on the tip end side of 6A and 6B. That is, the groove 36c is enlarged in diameter at the tip end face 6a, the tip 6b, and the tip 6b of the tip 6A, 6B side when starting use in a state where spot welding can be performed properly. It is formed in the shape which matches the external shape of the part 6c. Therefore, each roller 36A, 36B is made to approach a pair of electrode chips 6A, 6B with each other, while rotating the holder 40 holding each roller 36A, 36B using the support shaft 40. FIG. ), The pair of electrode chips 6A, 6B can be molded to be usable.

In addition, each forming roller 36A, 36B is comprised from the divided parts 38 and 38 divided into 2 each along the axial direction. The dividing surface 37 of the two divided parts 38 and 38 divided into two parts is, in the embodiment, the center of the groove 36c viewed from the axial orthogonal direction of the rollers 36A and 36B, that is, the electrode chips 6A, It is arrange | positioned at the center position of the front end surface 6a in the axially orthogonal direction of 6B).

In the case of the embodiment, the chips 6A and 6B to be molded have the same shape, and the forming rollers 36A and 36B are also the same shape, and the dividing surfaces 37 of the divided parts 38 and 38 are substantially long-shaped. Since it arrange | positioned in the axial center position of the rollers 36A and 36B, a pair of shaping | molding rollers 36A and 36B can be formed only by using four divisional shapes 38 of one shape.

Referring to the state of use of the chip molding machine M of the embodiment, after performing spot welding a predetermined number of times, the welding robot places the servo gun 1 near the chip molding machine M, and at the same time, the electrode chips 6A, 6B) is disposed so as to face each other in the upward direction above and below the through hole 34a of the holder 34. Then, correspondingly, the chip molding machine M drives the drive motor 22 in a rotational motion.

Then, the servo gun 1 is operated to approach each other so that the chips 6A and 6B are inserted into the holder 34 and pressed against the pair of forming rollers 36A and 36B. Then, the pair of forming rollers 36A and 36B rotates around the support shaft 40 while rotating along the holder 34 in the axial circumferential direction of the electrode chips 6A and 6B, thereby forming the shape of the recess 36c. Electrode chips 6A and 6B are molded as they are.

At this time, the two divided bodies in which the forming rollers 36A and 36B are arranged at the center position of the tip end surface 6a in the axially orthogonal direction of the electrode chips 6A and 6B after molding are formed. 38, 38, and the two partitions 38, 38 forming one forming roller 36A, 36B rotate in opposite directions to each other, and the front end faces of the electrode chips 6A, 6B ( 6a) and the enlarged diameter portion 6c are formed. Then, the partition 38 extends around the corner portion 6b from the tip surface 6a of the electrode chips 6A and 6B to the diameter-expanding portion 6c via the edge 6b of the tip surface 6a. Since it can form continuously integrally, the front end side of the electrode chip 6A, 6B, ie, the front end surface 6a and the edge part 6b of the edge, can be shape | molded to a predetermined shape with high precision.

4 and 5, when the holder 34 is rotationally driven in the axial circumferential direction of the electrode chips 6A and 6B in the clockwise state in the planar view, the forming roller 36A The partitions 38 and 38 rotate in the direction of the arrow in Fig. 5 while rotating against each other around the support shaft 40 by frictional resistance with the chip 6A, and the partitions of the forming roller 36B ( 38 and 38 are also rotated in the direction of the arrow in FIG. 5 while rotating against each other around the support shaft 40 due to the frictional resistance with the chip 6B. Of course, these rotational directions are rotated in the direction of rotation of the holder 34, when rotated counterclockwise, each partition 38 is rotated in the opposite direction to the arrow of FIG.

In the embodiment, the contact between the forming rollers 36A and 36B and the electrode chips 6A and 6B is substantially linear contact in the state along the axial direction at the outer circumferential surface of the forming rollers 36A and 36B. The electrode chips 6A and 6B can be plastically deformed and molded into a predetermined shape, in part, even at a small pressure for approaching the electrode chips 6A and 6B according to (1). Of course, even if the portion where the electrode chips 6A, 6B are deformed at the time of forming is partial, increasing the number of rotations of the holder 34 makes it possible to quickly form the entire front end surface of the electrode chips 6A, 6B. .

Therefore, in the chip forming machine M of the embodiment, the cutting edge 6a including the corner portions 6b of the edges is secured without being cut off from the servo gun 1, and quickly The pair of electrode chips 6A and 6B can be rotatably formed.

On the other hand, in the case of the embodiment, the pressure of the chips 6A, 6B to the forming rollers 36A, 36B is 2942 N (300 kgf), and the rotation speed of the holder 34 is 900 rpm, in about 1 to 3 seconds. After use, the chips 6A and 6B were usable (regenerated). In addition, when the rotation speed of the holder 34 was set to 500 rpm, the mold was usable in about 10 seconds. However, since it takes time, it is preferable to set the rotation speed to 500 rpm or more. In the embodiment, the chips 6A and 6B are made of chromium copper, the rollers 36A and 36B, the support shaft 40 and the holder 34 are made of alloy tool copper.

In the chip forming machine M of the embodiment, since the support shafts 40 and 40 of the pair of forming rollers 36A and 36B cross each other in the orthogonal direction, the following actions and effects can be obtained. .

That is, the shaping rollers 36A and 36B have a substantially long gear shape in which the projection shape in the orthogonal direction of the support shaft 40 is provided with grooves 36c corresponding to the tip shape of the electrode chips 36A and 36B. Both end sides of the shape are enlarged in diameter. Therefore, when the pair of forming rollers 36A and 36B are provided so that the support shafts 40 and 40 intersect each other in the orthogonal direction, the interference between the diameter-expanding sides is suppressed and the support shafts 40 and 40 mutually restrain each other. As compared with the case where the mutual support shafts 40 and 40 are arranged in parallel, the space to be installed side by side can be reduced, so that the volume of the holder 34 can be reduced. Therefore, when arrange | positioning the chip molding machine M in a welding work place, it becomes possible to save space and arrange | position.

In the case of the embodiment, the pair of electrode chips 6A and 6B is guided when pressed by the pair of forming rollers 36A and 36B in the vicinity of the holder 34 so that the cores of the electrode chips 6A and 6B are formed during molding. Guide members 31 and 31 are provided with guide holes 31a which can regulate the side of the branch portion 6d in the axial orthogonal direction by the inner circumferential surface 31b.

Therefore, if the dimension of the outer diameter of the shaping rollers 36A and 36B is small, when the electrode chips 6A and 6B are pressed, the electrode chips 6A and 6B are deviated from the outer peripheral surfaces of the shaping rollers 36A and 36B. There is a risk of deviation, which can be prevented by positioning the outer circumferential surface of the chip wick 6d by the inner circumferential surface 31b of the guide hole 31a. That is, the electrode chips 6A and 6B can be formed smoothly even if the size of the outer diameter of the forming rollers 36A and 36B is made small so as to set the chip forming machine M while saving space.

On the other hand, in the embodiment, the divided surfaces 37 of the divided bodies 38 and 38 constituting the forming rollers 36A and 36B are formed at the tip end surface 6a in the axial orthogonal direction of the electrode chips 6A and 6B after molding. In the case where the center of the chip is placed at the center position, the corner portions 6b of the edges of the tip faces 6a of the chips 6A and 6B include the vicinity of the tip faces 6a and the diameter-expanding portions 6c. Since it is desirable to be molded integrally continuously and formed with high precision, the divided surface of the divided body is divided from the edge of the front end surface 6a in the axial orthogonal direction of the electrode chips 6A and 6B after molding. It is good to arrange | position in area Y (refer FIG. 6) to the center position of (). Therefore, like the divided bodies 39A and 39B shown in FIG. 7, the divided surface 37A is disposed at the edge 6b of the tip end surface 6a in the axial orthogonal direction of the electrode chips 6A and 6B after molding. You may comprise so that. In this case as well, since the divided body 39A can continuously shape the range from the tip end face 6a to the side of the diameter-expanded part 6c passing through the corner part 6b, the lines of the chips 6A and 6B to be molded. The site | part from the end surface 6a through the corner part 6b to the diameter expansion part 6c can be shape | molded precisely. And of course, the divided surface of the divided body is the region Y from the edge of the front end surface 6a in the axial orthogonal direction of the electrode chips 6A, 6B after molding to the center position of the front end surface 6a (see Fig. 6). Since it is preferable to arrange | position to, it may be arrange | positioned between the edge vicinity 6b and the center vicinity of the front end surface 6a like the dividing surface 37B shown by the dashed-dotted line of FIG.

However, when the dividing surface 37 is disposed at the center position of the tip surface 6a as in the embodiment, the dividing body 38 having the same shape can be used, thereby reducing the type of components of the chip forming machine M. Can be.

According to the present invention, it is possible to form a pair of electrode chips so that the accuracy of the tip surface including the corner portions of the edge can be secured without being removed from the welding gun.

Claims (3)

A chip forming machine for uselessly molding a pair of electrode chips for spot welding held in a welding gun, The electrode chips each have a tip end side, a circular tip end face, and a diameter enlargement part that extends in diameter from an edge of the tip end face to a cylindrical wick, and the tip ends are accessible to each other. Held in the welding gun, A pair of forming rollers are installed side by side along the approach direction of the electrode chips, and are supported on the support shaft in a direction orthogonal to the approach direction so as to be rotatable. Each support shaft for supporting the pair of forming rollers is held in a holder that rotates in an axial circumferential direction of the pair of electrode chips that are approached. When the pair of electrode chips are pressed to approach each other while rotating the holder, the pair of forming rollers are orthogonal to each support shaft so that the pair of forming rollers can be used to mold the pair of electrode chips. A projection divided in two directions along the axial direction, wherein the projection shape in the direction is a shape having grooves corresponding to the tip-side outer shape after forming the electrode chip; And the divided surface of two divided parts divided into two parts is arranged in the area from the edge of the said front end surface to the center position of a front end surface in the axial orthogonal direction of the said electrode chip, after shaping | molding. The method of claim 1, And a support shaft of the pair of forming rollers arranged so as to intersect in a direction perpendicular to each other. The method according to claim 1 or 2, In the vicinity of the holder, a guide hole for guiding the pair of electrode chips when pressed against the pair of forming rollers to restrict the electrode chip wick side from shaking in the axial orthogonal direction at the time of molding is formed. Chip forming machine characterized in that the guide member provided is further provided.

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