JP5962553B2 - Spot welding tip shaping device - Google Patents

Description

  The present invention relates to a shaping device for shaping a spot welding tip after use into a regular shape.

  The tip attached to the pair of shank parts of the spot welding gun that performs spot welding is worn and deformed so that the diameter of the tip part is expanded each time welding is performed. For this reason, using a device for shaping the chip shape called a chip shaper, the tip of the tip is shaped with a rotating blade, and the tip used for welding at a dozen to hundreds of dots is shaped again into a shaped shape. ing. This extends the life of the chip.

As such a device for shaping a chip, for example, there is an electrode tip shaping device disclosed in Patent Document 1. In this electrode tip shaping device, an extrusion surface that is displaced toward the front side in the rotational direction is formed in the shaping jig for shaping the electrode tip from the radially inner side to the radially outer side. As a result, more electrode points can be welded with one electrode tip.
Further, for example, in the spot welding electrode tip surface forming apparatus disclosed in Patent Document 2, a cutter having a cutting blade adapted to the shape of the tip surface of the electrode is fitted into a rotatable blade holder, and cutting is performed. It is disclosed to form a notch in the blade. In Patent Document 2, chips are divided by a notch to prevent clogging of chips in the blade holder.

JP 2009-136882 A JP-A-5-305457

  However, as disclosed in Patent Document 1, it is difficult to manufacture a shaping jig when a spiral shaped extrusion surface for shaping a chip is directly formed on the shaping jig. That is, the extrusion surface (shaping blade) portion of the shaping jig needs to be made of a hard material, and the workability is poor such that the processing accuracy does not come out as intended, the processing time is long, and the processing cost is high. There is a problem. Moreover, the cutter in Patent Document 2 only shapes the tip surface of the electrode (chip), and does not shape the side surface of the electrode.

  The present invention has been made in view of such a background, and has been obtained in an attempt to provide a spot welding tip shaping device that can easily shape a tip into a regular shape with a shaping jig that is easy to manufacture. is there.

One aspect of the present invention is a cylindrical holder cylinder having an insertion hole into which a spot welding tip is inserted;
A holder bottom portion disposed at an end portion of the holder cylinder portion and formed with a tip shaping blade for shaping the tip surface of the tip;
Side surface shaping that shapes the curved side surface of the tip held by a linear blade holding groove formed at a plurality of positions in the circumferential direction on the inner circumferential surface of the holder cylinder portion so as to be inclined in one circumferential direction. A flat blade tool plate with blades formed thereon;
Rotating means for relatively rotating the shaping jig in which the holder cylinder part, the holder bottom part and the blade plate are integrated in the circumferential direction of the chip,
A spot configured to cause the material portion constituting the chip to flow from the curved side surface to the tip surface by the side shaping blade of the blade plate and the tip shaping blade of the holder bottom. It exists in the shaping device of the welding tip (Claim 1).

  In the spot welding tip shaping device, a shaping jig used for shaping the spot welding tip is configured using a holder cylinder portion, a holder bottom portion, and a plurality of cutting tool plates. The tip shaping blade is formed on the bottom of the holder, and the side shaping blade is formed on a plurality of blade plates. Thereby, the parent body on which each shaping blade is formed can be made small, and the shaping jig can be easily manufactured.

Moreover, the blade tool plate which has a side shaping blade is hold | maintained in the blade holding groove which inclines in the one rotation direction of the circumferential direction in the inner peripheral surface of a holder cylinder part. Thereby, a blade tool plate can be formed in flat form and manufacture of a shaping | molding jig | tool can be made still easier. When the tip is brought into contact with the tip shaping blade and the side shaping blade and the shaping jig and the tip are relatively rotated by the rotating means, the material portion constituting the tip is moved from the curved side surface of the tip to the tip of the tip. Can flow to the surface.
Therefore, according to the spot welding tip shaping device, it is possible to easily shape the tip into a regular shape with an easy-to-manufacture shaping jig.

The perspective view which shows the shaping apparatus of the spot welding tip concerning an Example. Sectional drawing which shows the shaping jig | tool concerning the Example in the state seen from the outer end surface of the holder cylinder part. Sectional drawing shown by the AA arrow of FIG. 2 which is a figure which shows the shaping jig | tool concerning an Example. Sectional drawing shown by the BB arrow of FIG. 2 which is a figure which shows the shaping jig | tool concerning an Example.

A preferred embodiment of the above-described spot welding tip shaping device will be described.
In the spot welding tip shaping device, the regular shape of the curved side surface of the tip is an inclined surface portion whose diameter is reduced toward the tip, and a curved surface portion formed on the tip side with respect to the inclined surface portion. The side shaping blade of the cutting tool plate has a proximal side blade part having a shape along the inclined surface part and a distal side blade part having a shape along the curved surface part. (Claim 2).
In this case, the shape of the side shaping blade of the blade plate can be appropriately formed so as to follow the normal shape of the tip, and the tip can be shaped more reliably.

Further, the holder tube portion that holds the blade plate in the blade holding groove is disposed on both sides with respect to the holder bottom portion, and the tips respectively attached to a pair of shank portions in the spot welding gun include the shaping treatment. The shaping jig may be configured to be rotated by the rotating means in a state of being inserted into the insertion hole of each of the holder tube portions of the tool (claim 3).
In this case, shaping can be performed by the shaping device on the chips that are still attached to the pair of shank portions in the spot welding gun. Therefore, the chip can be shaped more easily.

Hereinafter, embodiments of a spot welding tip shaping device will be described with reference to the drawings.
As shown in FIG. 1, the shaping device 1 of the spot welding tip 6 (hereinafter simply referred to as the tip 6) of the present example includes a holder cylinder portion 2, a holder bottom portion 3, a cutting tool plate 4, and a rotating means 12. The holder cylinder portion 2 is formed in a cylindrical shape having an insertion hole 21 into which the spot welding tip 6 is inserted. The holder bottom 3 is disposed at the end of the holder tube 2 and has a tip shaping blade 31 that shapes the tip surface 61 of the chip 6.

As shown in FIGS. 2 to 4, the cutting tool plate 4 is a linear cutting tool formed by inclining in one rotation direction of the circumferential direction C at a plurality of locations in the circumferential direction C on the inner peripheral surface 201 of the holder tube portion 2. It is held in the holding groove 22. The blade plate 4 has a flat plate shape and has a side shaping blade 41 that shapes the curved side surface 62 of the chip 6. The rotating means 12 is configured to rotate the shaping jig 11 in which the holder cylinder portion 2, the holder bottom portion 3, and the blade plate 4 are integrated in one rotation direction T of the circumferential direction C of the chip 6.
The shaping jig 11 is configured to flow the material portion constituting the chip 6 from the curved side surface 62 to the tip surface 61 by the side shaping blade 41 of the cutting tool plate 4 and the tip shaping blade 31 of the holder bottom 3. Yes.

Hereinafter, the shaping device 1 for the spot welding tip 6 of this example will be described in detail with reference to FIGS.
The shaping device 1 is used in a process of assembling a product by spot welding in a factory. The tips 6 to be shaped by the shaping device 1 are respectively attached to a pair of shank portions in the spot welding gun. And the shaping apparatus 1 shapes the front-end | tip part 60 of a pair of chip | tip 6 which deform | transformed by repeating spot welding.
The tip portions 60 of the pair of tips 6 are deformed by being crushed and expanded in diameter when used for spot welding. The shaping device 1 shapes the tip portions 60 of the pair of chips 6 that have been deformed so as to expand their diameters so as to be upset into a normal shape (initial shape).

  As shown in FIG. 3, the regular shape of the curved side surface 62 of the chip 6 includes an inclined surface portion 621 that is reduced in diameter toward the tip, and a curved surface portion 622 that is formed on the tip side with respect to the inclined surface portion 621. It has a shape. The tip portion 60 of the chip 6 is formed by an inclined surface portion 621, a curved surface portion 622, and a tip surface 61 located at the tip of the curved surface portion 622. The tip surface 61 of the chip 6 may be formed in a curved surface continuous with the curved surface portion 622 or may be formed in a flat shape perpendicular to the axial direction of the chip 6. A cylindrical base end portion 63 attached to the shank portion of the spot welding gun is formed on the base side of the tip 6.

As shown in FIGS. 1 and 4, the side shaping blade 41 of the blade plate 4 includes a proximal-side blade portion 411 having a shape along the inclined surface portion 621 and a distal-side blade portion 412 having a shape along the curved surface portion 622. Have. The side shaping blade 41 is formed on the inner peripheral side surface of the cutting tool plate 4, and the outer peripheral side surface of the cutting tool plate 4 is formed in a linear shape held in the cutting tool holding groove 22. The side shaping blade 41 has a boundary portion 413 where the inclination angle changes intermittently between the proximal end blade portion 411 and the distal end blade portion 412. The thickness of the blade plate 4 is constant, and the width of the blade plate 4 is most reduced at the boundary portion 413.
The side shaping blade 41 is formed by a curved surface inclined with respect to the axial direction L of the holder tube portion 2 because the blade plate 4 is inclined and held in the blade holding groove 22 of the holder tube portion 2. Further, the side shaping blade 41 is formed in an arcuate cross-sectional shape.

As shown in FIGS. 1, 3, and 4, the holder tube portion 2 that holds the blade plate 4 in the blade holding groove 22 is disposed on both sides with respect to the holder bottom portion 3. The shaping device 1 is shaped by the rotating means 12 in a state where the tips 6 respectively attached to the pair of shank parts in the spot welding gun are inserted into the insertion holes 21 of the holder cylinder parts 2 in the shaping jig 11. The jig 11 is configured to rotate in one rotation direction T.
The rotating means 12 is configured using a support portion that supports the shaping jig 11 and a motor that rotates the support portion. The rotating means 12 can have various structures for rotating the shaping jig 11 in one rotation direction T around the axial direction L of the holder tube portion 2.

As shown in FIG. 2, the holder bottom 3 has tip shaping blades 31 extending from the center where the center axis of the chip 6 is disposed to both sides in the radial direction. The tip shaping blade 31 extending on both sides in the radial direction is formed in a state of being twisted into an S shape when seen in a plan view. The holder bottom 3 is formed with a bottom holding groove 32 into which the axial end of the blade plate 4 is fitted. The bottom holding groove 32 is formed with a phase shift of 90 ° in the circumferential direction C from the tip shaping blade 31.
In addition, the blade tool plate 4 of this example is held by the blade holding grooves 22 formed at two places whose phases are shifted by 180 ° in the circumferential direction C of the inner peripheral surface 201 of the holder tube portion 2.

  As shown in FIG. 3, in the pair of holder tube portions 2, a holder lid portion that prevents the blade plate 4 from coming out of the blade holding groove 22 at the end opposite to the end where the holder bottom 3 is disposed. 5 is arranged. The shaping jig 11 has a pair of holder cylinders 2 sandwiched between the holder bottom 3 and a pair of holder cylinders 5 sandwiched between the pair of holder cylinders 2 and the holder bottom 3. The holder lid 5, the pair of holder cylinders 2 and the holder bottom 3 are integrated by a plurality of bolts 51.

  In the shaping apparatus 1 for the spot welding tip 6 of this example, the shaping jig 11 used for shaping the spot welding tip 6 is made up of a pair of holder cylinder parts 2, a holder bottom part 3, a plurality of cutting tool plates 4, and a pair of holders. The lid portion 5 is used. The tip shaping blade 31 and the side shaping blade 41 are formed on the holder bottom 3 and the plurality of blade plates 4, respectively. Thereby, the base body in which each shaping blade 31 and 41 is formed can be made small, and manufacture of the shaping jig | tool 11 can be made easy.

  Further, the cutting tool plate 4 having the side shaping blade 41 is held in the cutting tool holding groove 22 that is inclined linearly on the inner peripheral surface 201 of the holder tube portion 2. Thereby, the cutting tool plate 4 can be formed in flat form, and manufacture of a shaping | molding jig | tool can be made still easier. When the tip 6 is brought into contact with the tip shaping blade 31 and the side shaping blade 41 and the shaping jig 11 is rotated by the rotating means 12, the material portion constituting the chip 6 is inserted from the curved side surface 62 of the chip 6. 6 to the front end surface 61.

Further, the blade plate 4 can be attached to and detached from the holder tube portion 2, and the holder bottom portion 3 can be attached to and detached from the holder tube portion 2. Thus, when the number of times the shaping jig 11 is used exceeds a predetermined number, the blade plate 4 on which the side shaping blade 41 is formed or the holder bottom 3 on which the tip shaping blade 31 is formed is removed from the holder cylinder 2. Can be exchanged for a new one.
Therefore, according to the shaping device 1 of the spot welding tip 6 of this example, the tip 6 can be easily shaped into a regular shape by the shaping jig 11 which is easy to manufacture.

DESCRIPTION OF SYMBOLS 1 Shaping device 11 Shaping jig 12 Rotating means 2 Holder cylinder part 21 Insertion hole 22 Cutting tool holding groove 3 Holder bottom part 31 Tip shaping blade 4 Cutting tool plate 41 Side shaping blade 411 Base side blade part 412 Tip side blade part 6 For spot welding Tip 61 Tip surface 62 Curved side surface 621 Inclined surface portion 622 Curved surface portion

Claims (3)

A cylindrical holder cylinder having an insertion hole into which a spot welding tip is inserted; and
A holder bottom portion disposed at an end portion of the holder cylinder portion and formed with a tip shaping blade for shaping the tip surface of the tip;
Side surface shaping that shapes the curved side surface of the tip held by a linear blade holding groove formed at a plurality of positions in the circumferential direction on the inner circumferential surface of the holder cylinder portion so as to be inclined in one circumferential direction. A flat blade tool plate with blades formed thereon;
Rotating means for relatively rotating the shaping jig in which the holder cylinder part, the holder bottom part and the blade plate are integrated in the circumferential direction of the chip,
A spot configured to cause the material portion constituting the chip to flow from the curved side surface to the tip surface by the side shaping blade of the blade plate and the tip shaping blade of the holder bottom. Welding tip shaping device. 2. The spot welding tip shaping apparatus according to claim 1, wherein the regular shape of the curved side surface of the tip is an inclined surface portion whose diameter is reduced toward the tip, and a curved surface formed on the tip side with respect to the inclined surface portion. A shape having a curved surface portion,
The side shaping blade of the blade tool plate has a base end side blade portion having a shape along the inclined surface portion and a distal end side blade portion having a shape along the curved surface portion. Chip shaping device. 3. The spot welding tip shaping device according to claim 1 or 2, wherein the holder tube portion for holding the blade plate in the blade holding groove is disposed on both sides with respect to the holder bottom portion.
The shaping tool is rotated by the rotating means in a state where the tips respectively attached to the pair of shank parts in the spot welding gun are inserted into the insertion holes of the holder cylinder parts in the shaping jig. An apparatus for shaping a spot welding tip, characterized in that it is configured.

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