JPH04125076U - cutter for chip dresser - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a versatile and inexpensive cutter that can be used regardless of the rotational direction of the cutter holder and can also be used as the upper and lower cutters when simultaneously shaping a pair of upper and lower electrode tips. do. [Structure] The cutter body 31 has a main cutting edge 35 extending in one direction from a center point 0 that coincides with the rotation center of the cutter holder 4;
A auxiliary cutting edge 36 is formed which extends from the center point 0 to the other side and is mirror-symmetrical to the main cutting edge 35. When the cutter holder 4 rotates in the normal direction, the tip end portion of the tip is cut by the main cutting edge 35, and when the cutter holder 4 rotates in the reverse direction, the tip end of the tip is cut by the auxiliary cutting edge 36. The main and sub cutting edges 35 and 36 can be formed so that their rake faces and flank faces are flush with each other, making it easier to process the cutter.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a cutter for a tip dresser that shapes the electrode tip of a resistance welding machine. do.

0002

[Conventional technology]

The tip dresser is a cutter holder that is rotatably supported by the dresser body. Hold the cutter, rotate the cutter together with the cutter holder, and use the cutter to It is configured to cut and shape the tip of the electrode tip that abuts against the electrode tip. Conventionally, as this type of cutter, as seen in Japanese Utility Model Application Publication No. 63-127786, The cutter body consists of a single plate that is long in the diameter direction of the cutter holder. It extends from the center point that coincides with the rotation center of the cutter body to one side and the other side in the longitudinal direction of the cutter body. A pair of cutting edges are formed which are symmetrical about the center point, and both cutting edges cut the tip of the tip. It is known that it was made to look like this.

0003

[Problem that the idea aims to solve]

In the above model, one side of one half of the cutter body in the longitudinal direction is cut to make the cutter body uniform. Cut the rake face of one cutting edge and the other side of the other half in the longitudinal direction to form the other cutting edge. rake faces, and the respective flanks of one and the other cutting edges are oppositely oriented. It is necessary to form the cutter with a beveled angle, which increases the manufacturing cost of the cutter. In addition, it is necessary to manufacture a special cutter that matches the rotation direction of the cutter holder. Furthermore, attach a pair of upper and lower cutters to the cutter holder, and attach a pair of upper and lower electrodes to a welding gun, etc. When shaping chips at the same time, make the upper cutter and lower cutter mirror-symmetrical to each other. This necessitates manufacturing the upper and lower cutters separately. In view of the above points, the present invention can be used regardless of the direction of rotation of the cutter holder. Our goal is to provide an inexpensive cutter that can be used for both upper and lower cutters. The purpose is

0004

[Means to solve the problem]

In order to achieve the above purpose, the cutter of this invention has one long piece in the diametrical direction of the cutter holder. The center point of the cutter body, which is made of plate material, coincides with the center of rotation of the cutter holder. The main cutting edge that cuts the electrode tip extends to one side in the longitudinal direction of the cutter body, and the center point A minor cutting edge is formed which extends from the main cutting edge to the other side in the longitudinal direction of the cutter body and is mirror-symmetrical to the main cutting edge. It is characterized by what has been achieved.

[0005]

[Effect]

If the main cutting edge is formed so that its rake face faces the normal rotation direction of the cutter holder, the The rake surface of the secondary cutting edge, which is mirror-symmetrical to the cutting edge, faces the direction in which the cutter holder is reversed. When the cutter holder rotates in the forward direction, the main cutting edge cuts the tip of the chip, and when the cutter holder rotates in the reverse direction, the auxiliary cutting edge cuts the tip of the chip. The ends are cut. Attach a pair of upper and lower cutters to the cutter holder to simultaneously shape a pair of upper and lower electrode tips. If you use the original cutter as the upper and lower cutters, you can use the main cutter for either the upper or lower cutter. When one electrode tip is cut with the cutting blade, the other electrode tip is cut with the secondary cutting edge of the other cutter. Chips are cut. In addition, since the main cutting edge and the minor cutting edge are mirror-symmetrical to each other, the rake faces of both cutting edges and the relief Both sides become continuous surfaces, making it easier to process the cutter.

[0006]

【Example】

Referring to FIG. 1, 1 indicates a frame-like dresser body attached to a grip part 2, and When a cutter holder 4 holding a cutter 3 is rotatably supported in the cutter body 1, Both houses a drive gear 6 connected to a motor 5 assembled to the grip part 2, and a cutter hoist. A gear 4a that meshes with the drive gear 6 is formed on the outer periphery of the rotor 4, and is driven by the motor 5. The cutter holder 4 can be rotated forward and backward through the gear 6, and the upper surface of the dresser body 1 is Butt the electrode tip W against the cutter 3 through the tip guide plate 7 attached to the , so that the tip end of the tip is cut by the rotation of the cutter 3 as the cutter holder 4 rotates. I made it. 4b in the figure is a chip discharge hole formed in the cutter holder 4.

[0007] As shown in FIGS. 2 to 4, the cutter 3 has a longitudinal axis extending in the diametrical direction of the cutter holder 4. It consists of a cutter body 31 made of a single plate with an L-shaped cross section, and a cutter holder. A groove 4c for receiving the horizontal base 32 of the cutter body 31 is formed on the upper surface of the cutter 4, The cutter 3 is connected to the groove 4c so that the front surface of the upright portion 33 of the cutter body 31 is attached to the cutter holder. 4, and formed in the center of the base 32. The cutter 3 is held in the cutter holder by a tightening bolt 8 having a head that engages with the recess 34. Fixed it to Da4. The upright portion 33 of the cutter body 31 has a center that coincides with the rotation center of the cutter holder 4. The main cutting edge 35 extends from point 0 to one side in the longitudinal direction of the cutter body 31, and the main cutting edge 35 extends from the center point 0 to one side in the longitudinal direction of the cutter body 31 A minor cutting edge 36 is mirror-symmetrical to the main cutting edge 35 and extends in the other longitudinal direction of the cutter body 31. is formed. The rake faces 37 of the main and sub cutting edges 35 and 36 are on the diameter line. It is formed flush with the front surface of the standing portion 33 located, and the main and sub cutting edges 35, 3 The relief surface 38 of No. 6 can also be made into a surface by adding a relief angle that slopes backward downward to the upper surface of the standing portion 33. formed in one piece. Further, the tip of the electrode tip W is attached to the outer end portion of each cutting edge 35, 36. Rising portions 35a and 36b were formed by cutting the outer periphery of the portion. If the forward rotation direction of the cutter holder 4 is clockwise in FIG. 5 cuts the tip of the tip, and at this time, the auxiliary cutting edge 36 cuts the tip of the tip with a ladder. It has the function of smoothing the surface. The main cutting edge 35 is worn out and becomes dull. If this happens, reverse the cutter holder 4 and use the auxiliary cutting edge 36 to cut the tip of the chip. Cut.

[0008] In addition, as shown in FIG. When shaping a pair of electrode tips W and W at the same time, use the above cutters as upper and lower cutters. If shared, the main cutting edge of one cutter 3 and the auxiliary cutting edge of the other cutter 3 can cut each electrode chip. You can cut the tap W.

[0009]

[Effect of the idea]

As is clear from the above explanation, according to the present invention, there is no difference between forward and reverse rotation of the cutter holder. It can also be used as an upper and lower cutter when shaping a pair of electrode tips at the same time. A versatile cutter that can be shared is obtained, and the cutter is easier to process, reducing costs. This has the effect of lowering the costs.

[Brief explanation of drawings]

[Fig. 1] Cutaway side view of an example of a chip dresser equipped with the cutter of the present invention

[Figure 2] Front view of the cutter seen from line II-II in Figure 1

[Figure 3] Plan view of the cutter

[Figure 4] Sectional view taken along the line IV-IV in Figure 2

[Figure 5] Cutaway side view of a chip dresser with a pair of upper and lower cutters installed according to the present invention

[Explanation of symbols]

3 Cutter 31 Cutter body 35 Main cutting blade 36 Minor cutting blade 4 Cutter holder

Claims (1)

[Scope of utility model registration request] 1. A cutter held in a cutter holder in a tip dresser for shaping electrode tips of a resistance welding machine, the cutter body consisting of a single plate material elongated in the diametrical direction of the cutter holder. A main cutting edge that cuts the electrode tip extends in one longitudinal direction of the cutter body from a center point that coincides with the center, and a auxiliary cutting edge that is mirror-symmetrical to the main cutting edge and extends in the other longitudinal direction of the cutter body from the center point. A cutter for a chip dresser, characterized in that a cutter is formed.