WO2022064948A1 - Cutter unit for tip dressing and manual tip dresser - Google Patents

Abstract

Provided are a cutter unit for tip dressing that is capable of extending the useful life of a cutter, can smoothly discharge chips produced during cutting, and is comfortable to use, and a manual tip dresser on which the cutter unit is mounted. A cutter unit (3) attached to a manual tip dresser (1) is provided with a rotating holder (6) and a cutter (7) that can be attached to and removed from the rotating holder (6). The rotating holder (6) comprises a tip receiving section (6c) that receives a tip end section (11a) of an electrode tip (11) during cutting, and a pass-through section (8) that passes through in the rotation axis (C1) direction. The cutter (7) is attached to an inner side surface of the pass-through section (8) in an attitude extending in the radial direction of the rotating holder (6) and in the rotation axis (C1) direction. A widened section (8a), which is set to a size that is wider in the radial direction of the rotating holder (6) than one side thereof in the rotation axis (C1) direction, is provided to the other side of the through section (8) in the rotation axis (C1) direction.

Description

Cutter unit for tip dress and manual tip dress

The present invention relates to a tip dress cutter unit used for cutting the tip of a spot welding electrode tip and a manual tip dress to which the cutter unit is attached.

Conventionally, for example, the tip dress disclosed in Patent Document 1 is a tip dress that is manually operated by a user to cut the tip of an electrode tip for spot welding, and has a substantially rod shape in which a motor is housed. It is equipped with a dresser body. A cutter unit that rotates about the center line is pivotally supported on one end side of the dresser body, while the other end side of the dresser body is a grip portion that the user grips. The cutter unit is composed of a rotary holder having a short tubular shape and a plate-shaped cutting cutter attached to the inside of the rotary holder, so that the cutting cutter passes through the rotation axis of the rotary holder. It is in a posture that extends in the radial direction of the rotating holder. On the other end side of the dresser body, a switch lever that switches the start or stop of the motor is rotatably provided, and a cutting cutter is placed at the tip of the electrode tip with the central axis of the electrode tip aligned with the center of rotation. The cutter unit rotates and the cutting cutter is rotated by contacting from one end side of the cutter unit and by rotating the switch lever toward the grip portion while the user grips the grip portion and gripping the switch lever together with the grip portion. The tip of the electrode tip is cut. The chips generated during cutting pass through the penetrating portion provided between the inner peripheral surface of the rotary holder and the cutting cutter, and are discharged from the other end side of the cutter unit.

By the way, the cutter unit of Patent Document 1 has a structure in which only the cutting cutter comes into contact with the tip of the electrode tip when cutting the tip. Therefore, repeated use may impose a large load on the cutting cutter and shorten the life of the cutting cutter.

In order to cope with this, for example, as in Patent Document 2, a concave tip receiving portion for receiving the tip of the electrode tip is provided in the rotating holder, and the tip of the electrode tip is rotated not only by the cutting cutter but also during cutting. It is conceivable to bring it into contact with the holder as well.

Japanese Unexamined Patent Publication No. 2006-212685 International Publication No. 2013/0671710

However, if the rotary holder is provided with a chip receiving portion, the penetrating portion for passing chips generated during cutting in the cutter unit becomes narrow, so that each chip generated during cutting passes through the penetrating portion. It often gets stuck inside. Therefore, the user must clean the penetrating portion every time the penetrating portion is clogged with chips and the cutting operation cannot be performed, which may result in a poor usability.

The present invention has been made in view of these points, and an object of the present invention is to extend the life of the cutting cutter and to provide a feeling of use in which chips generated during cutting can be smoothly discharged. It is to provide a good tip dress cutter unit and a manual tip dress fitted with it.

In order to achieve the above object, the present invention is characterized in that the shape of the penetrating portion in the cutter unit is devised.

Specifically, it is provided with a rotary holder that rotates around the center of rotation and a cutting cutter that is detachably attached to the rotary holder and that cuts the tip of the spot welding electrode tip by the rotational operation of the rotary holder. The following measures were taken for the cutter unit for chip dresses.

That is, in the first invention, the rotary holder is provided on one side in the direction of the center of rotation axis, and penetrates the tip receiving portion for receiving the tip end portion of the electrode tip in the direction of the center of rotation axis during cutting. In addition to opening to the chip receiving portion, the inner side surface is provided with a penetration portion to which the cutting cutter is attached in a posture extending in the radial direction and the rotation axis direction of the rotation holder, and is provided on the other side of the rotation axis direction of the penetration portion. Is characterized in that a wide portion set to a wider dimension in the radial direction of the rotation holder than on one side in the direction of the center of rotation axis is provided.

In the second invention, in the first invention, the cutting cutter is attached to the rotary holder in a posture extending radially outward from the rotation axis, and the wide portion is defined with the mounting surface of the cutting cutter as a boundary. It is characterized in that it is provided by making the dimension of the region of the other half of the rotary holder in the direction of the axis of rotation shorter than the region of the region of the other half of the rotary holder to which the cutting cutter is attached. ..

In the third invention, in the first or second invention, the cutting cutter has a plate-like shape and has a screw insertion hole penetrating in the plate thickness direction, and the screw inserted through the screw insertion hole is rotated. It is attached to the rotating holder by being screwed into the holder, and the screw insertion hole is provided at a position corresponding to the wide portion.

In the fourth invention, the manual type chip dress rotatably supports the cutter unit for chip dress according to any one of the first to third inventions and the cutter unit at one end around the rotation axis. On the other hand, a dresser main body provided with a grip portion to be gripped by the user during operation on the other end side, a motor provided inside the dresser main body to rotationally drive the cutter unit, and a rotation to the other side of the dresser main body. It is provided with a switch lever that is movably pivotally supported and rotated to the side approaching the grip portion to start the motor, while rotating to the side away from the grip portion to stop the motor. It is characterized by being.

In the first invention, when cutting the tip of the electrode tip, the cutting cutter cuts the tip of the electrode tip in a state where both the tip receiving portion of the rotary holder and the cutting cutter receive the tip of the electrode tip. Will come to do. Therefore, the load applied to the cutting cutter at the time of cutting can be reduced as compared with the cutter unit having the structure as in Patent Document 1, and the life of the cutting cutter can be extended. In addition, since the width of the through hole becomes wider as the distance from the cutting point increases, even if the movement of the chips decreases as the distance from the cutting point increases, it is difficult for the chips to become clogged inside the through hole. .. Therefore, the number of cleanings of the penetrating portion can be reduced, and the usability can be improved.

In the second invention, it is possible to relatively easily perform processing for widening the region on the other side in the direction of the axis of rotation in the penetrating portion, so that a low-cost cutter unit can be obtained.

In the third invention, when the cutting cutter is attached to the rotary holder, the head of the screw is located in the wide portion of the penetrating portion. Therefore, even if the chips come into contact with the head of the screw when passing through the penetrating portion, they are less likely to be caught between the inner peripheral surface of the penetrating portion and the head of the screw, and the generated chips are surely collected. It can be discharged to the outside of the cutter unit.

In the fourth invention, the user can operate the start and stop of the rotational operation of the cutter unit while grasping the tip dress with one hand, so that the device can be made easy to use.

It is a perspective view of the manual type chip dress which concerns on embodiment of this invention. It is the II arrow view of FIG. It is an exploded perspective view of the cutter unit which concerns on embodiment of this invention. It is an IV arrow view of FIG. It is a V arrow view of FIG. FIG. 3 is a cross-sectional view taken along the line IV-IV of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example.

FIG. 1 shows a manual tip dress 1 according to an embodiment of the present invention. The manual tip dress 1 is for cutting the tip portion 11a of the electrode tip 11 (see FIG. 6) fitted in the shank of a spot welding gun (not shown), and approximately half of one side in the longitudinal direction is used. It is provided with a metal dresser body 2 having a thick plate shape and a substantially cylindrical shape on the other side in the longitudinal direction.

A pair of circular openings 2a facing each other are formed on both sides of the dresser body 2 on one side in the longitudinal direction in the thickness direction so as to communicate with the inside of the dresser body 2.

Between the two openings 2a, a metal cutter unit 3 having a substantially disk shape is rotatably supported around a rotation axis C1 extending in the thickness direction of the dresser main body 2.

On the other hand, the other side of the dresser body 2 in the longitudinal direction is a grip portion 2b that the user grips during operation, and inside the grip portion 2b, a motor 4 that rotationally drives the cutter unit 3 via a gear meshing mechanism (not shown) is located inside the grip portion 2b. It is contained.

A switch lever 5 having an elongated strip shape is provided on the side of the grip portion 2b in the dresser main body 2, and one end side of the switch lever 5 is rotatably supported by the other end of the dresser main body 2. ..

The switch lever 5 is rotated to the side closer to the grip portion 2b to start the motor 4, while it is rotated to the side away from the grip portion 2b to stop the motor 4, and is not shown. It is urged to the side separated from the grip portion 2b by the urging member.

As shown in FIGS. 2 and 3, the cutter unit 3 has a rotation holder 6 having a substantially C-shape in a plan view whose center line coincides with the rotation axis C1, and cutting that is detachably attached to the rotation holder 6. It is equipped with a cutter 7.

The rotary holder 6 has notches 6a that gradually expand in the circumferential direction around the rotary axis C1 and open outwards as they move outward in the radial direction from the rotary axis C1 and also open on both sides in the rotary axis C1 direction. ing.

A flange portion 6b having a substantially barrel shape in a plan view, which extends outward from the other portions, is formed on the peripheral portion of the rotary holder 6 on one side in the rotation axis C1 direction.

Further, on the surface of the rotary holder 6 on one side in the rotation axis C1 direction, a tip receiving portion 6c whose diameter gradually decreases toward the central portion of the rotary holder 6 is formed.

The shape of the chip receiving portion 6c corresponds to the curved shape of the tip portion 11a of the electrode chip 11, and the tip portion 11a of the electrode chip 11 is held in a state where the central axis of the electrode chip 11 coincides with the rotation axis C1. It is possible to accept it.

In the chip receiving portion 6c, a plurality of arcuate stepped surface portions 6e extending around the rotation axis C1 are continuously formed in a step shape toward the rotation axis C1. That is, each stepped surface portion 6e is composed of a horizontal portion 6f extending in the horizontal direction and a vertical portion 6g extending in the vertical direction, and the continuous portion 6h of the horizontal portion 6f and the vertical portion 6g has a sharp shape with a right angle in cross section. No. When the tip receiving portion 6c receives the tip portion 11a of the electrode tip 11, each continuous portion 6h comes into contact with the tip portion 11a. In the rotary holder 6 of the embodiment of the present invention, both the case where the electrode tip 11 of φ13 is received by the chip receiving portion 6c and the case where the electrode tip 11 of φ16 is received by the chip receiving portion 6c Each continuous portion 6h is designed to come into contact with the surface of the tip portion 11a of the electrode tip 11.

On one inner surface extending outward from the rotation axis C1 in the notch 6a, a mounting surface 6d that is recessed in a substantially T-shape in a side view, which is a position for mounting the cutting cutter 7, is formed. ..

Assuming that one half of the rotary holder 6 to which the cutting cutter 7 is mounted is a region 6A and the other half is a region 6B with the mounting surface 6d as a boundary, the rotary holder 6 is in the direction of the rotation axis C1 of the region 6B. Is shorter than the region 6A, and a space S1 is formed on the other side of the region 6B in the direction of the rotation axis C1.

That is, the notch 6a and the space S1 form the penetrating portion 8 of the present invention, and the penetrating portion 8 penetrates in the direction of the rotation axis C1 and opens to the chip receiving portion 6c, and the penetrating portion 8 is formed. On the other side of the rotation axis C1 direction, a wide portion 8a set to a wider dimension in the radial direction of the rotation holder 6 than on one side of the rotation axis C1 direction is provided.

As shown in FIGS. 3 to 5, the cutting cutter 7 is formed by cutting out a metal plate in a substantially T shape, and has a shape corresponding to the mounting surface 6d.

A screw insertion hole 7a penetrating in the plate thickness direction is formed on the other side of the cutting cutter 7 in the direction of the rotation axis C1. The screws 10 inserted in the 7a in order are screwed into the rotary holder 6 so as to be attached to the rotary holder 6.

That is, the screw insertion hole 7a is provided at a position corresponding to the wide portion 8a of the present invention.

When the cutting cutter 7 is attached to the rotary holder 6, it is in a posture of extending radially outside the rotary holder 6 and in the direction of the rotation axis C1.

One plate surface of the cutting cutter 7 faces the mounting surface 6d, while the other plate surface constitutes the rake face portion 7b, and the rake face portion 7b is in the circumferential direction around the rotation axis C1. It extends to intersect with each other.

On one side of the rake face portion 7b in the direction of the rotation axis C1, a flank surface portion 7c substantially orthogonal to the rake face portion 7b is provided.

The flank portion 7c has a curved shape gradually located on one side in the direction of the rotation axis C1 as the distance from the rotation axis C1 increases.

The flank portion 7c has a shape corresponding to the tip receiving portion 6c with the cutting cutter 7 attached to the rotary holder 6, and the central axis of the electrode tip 11 coincides with the rotation axis C1. When they are brought close to each other, they face the tip portion 11a of the electrode tip 11.

A pair of positioning recesses 7d cut out in a rectangular shape in a side view are formed in the upper part and the lower part on the side far from the rotation axis C1 of the cutting cutter 7.

A cutting edge portion 7e extending so as to intersect the rotation axis C1 is formed in the continuous portion of the rake face portion 7b and the flank surface portion 7c.

Then, when the electrode tip 11 in a state where the central axis coincides with the rotation axis C1 is brought into contact with the rotating holder 6 in a rotating state, the cutting cutter 7 comes into contact with the tip portion 11a of the electrode tip 11 and the tip portion 11a is brought into contact with the tip portion 11a. It is cut by the cutting edge portion 7e to generate chips M1.

Next, the work of cutting the tip portion 11a of the electrode tip 11 using the manual tip dress 1 will be described.

First, the user grips the grip portion 2b of the manual tip dress 1 and moves the manual tip dress 1 to attach the electrode tip 11 to a shank (not shown) as shown in FIGS. 4 and 5. The tip portion 11a is received by the tip receiving portion 6c of the rotation holder 6 so that the central axis of the electrode tip 11 coincides with the rotation axis C1.

Next, the user grips the switch lever 5 together with the grip portion 2b so that the switch lever 5 rotates toward the grip portion 2b. Then, the motor 4 is activated, the cutter unit 3 rotates about the rotation axis C1, and the cutting edge portion 7e of the cutting cutter 7 comes into contact with the tip portion 11a of the electrode tip 11 to cut the tip portion 11a. In this way, when cutting the tip portion 11a of the electrode tip 11, the cutting cutter 7 receives the tip portion 11a of the electrode tip 11 by both the tip receiving portion 6c of the rotary holder 6 and the cutting cutter 7. The tip portion 11a of the tip 11 is cut. Therefore, the load applied to the cutting cutter 7 at the time of cutting is reduced as compared with the cutter unit having the structure as in Patent Document 1, and the life of the cutting cutter 7 can be extended.

When the cutting edge portion 7e of the cutting cutter 7 cuts the tip portion 11a of the electrode tip 11, each continuous portion 6h having a sharp cross section on the stepped surface portion 6e of the tip receiving portion 6c becomes the tip portion 11a of the electrode tip 11, respectively. Contact. When the rotary holder 6 rotates in this state, each continuous portion 6h is caught in the direction intersecting the central axis with respect to the tip portion 11a of the electrode tip 11 and guides the rotation of the rotary holder 6 with respect to the tip portion 11a of the electrode tip 11. Will come to do. Therefore, during cutting work, when the rotary holder 6 is rotated, the tip portion 11a of the electrode tip 11 slides with respect to the chip receiving portion 6c in a direction intersecting the central axis thereof, and the rotation axis C1 is the central axis of the electrode tip 11. It is possible to stabilize the cutting operation of the cutting cutter 7 without being displaced. Further, the contact area between the tip portion 11a of the electrode tip 11 and the tip receiving portion 6c is reduced, and the amount of the cutting edge portion 7e biting into the tip portion 11a of the electrode tip 11 during rotation of the rotary holder 6 is increased. The cutting ability of the cutting cutter 7 can be enhanced to efficiently cut the tip portion 11a of the electrode tip 11.

When the cutting edge portion 7e of the cutting cutter 7 cuts the tip portion 11a of the electrode tip 11, chips M1 are generated in the notch portion 6a as shown in FIG. The chips M1 move from the notch 6a to the space S1 (wide portion 8a) having a width larger than that of the notch 6a, and then are discharged to the outside of the cutter unit 3. That is, since the width dimension of the penetration portion 8 of the embodiment of the present invention becomes wider as the distance from the cutting portion increases, even if the movement of the chip M1 decreases as the distance from the cutting portion increases, the chip M1 still exists. It is unlikely that the inside of the penetrating portion 8 will be clogged. Therefore, the number of cleanings of the penetrating portion 8 can be reduced, and the feeling of use can be improved.

The space S1 has a shorter dimension in the rotation axis C1 direction of the region 6B on the other side than the region 6A on one side half of the rotation holder 6 to which the cutting cutter 7 is mounted, with the mounting surface 6d of the cutting cutter 7 as a boundary. Since it is provided by forming it into a shape, it is relatively easy to process the penetrating portion 8 to widen the region on the other side in the rotation axis C1 direction, and the cutter unit 3 can be made at low cost.

Further, since the screw insertion hole 7a of the cutting cutter 7 is provided at a position corresponding to the wide portion 8a, when the cutting cutter 7 is attached to the rotary holder 6, the head portion 10a of the screw 10 is wide in the penetrating portion 8. It will be located in the portion 8a. Therefore, even if the chips M1 come into contact with the head portion 10a of the screw 10 when passing through the penetrating portion 8, it is less likely to be caught between the inner peripheral surface of the penetrating portion 8 and the head portion 10a of the screw 10. The generated chips M1 can be reliably discharged to the outside of the cutter unit 3.

After performing the cutting work for a predetermined time, the user releases the switch lever 5 and rotates the switch lever 5 to the side away from the grip portion 2b to stop the motor 4 and stop the tip portion of the electrode tip 11. The cutting work of 11a is completed. As described above, the manual tip dress 1 according to the embodiment of the present invention is easy to use because the user can operate the start and stop of the rotational operation of the cutter unit 3 while gripping the grip portion 2b with one hand. Can be a good device.

In the embodiment of the present invention, the wide portion 8a of the penetrating portion 8 is on the other side of the region 6A on one side half of the rotary holder 6 to which the cutting cutter 7 is mounted, with the mounting surface 6d of the cutting cutter 7 as a boundary. Half of the area 6B is provided by making the dimension in the rotation axis C1 direction short, but by making the rotation holder 6 into another shape, the area on the other side in the rotation axis C1 direction of the penetrating portion 8 is widened. It may be sized.

Further, although the cutter unit 3 of the present invention is used by being attached to the manual tip dress 1, it can also be used by being attached to the automatic tip dress.

The present invention is suitable for a tip dress cutter unit used for cutting the tip of a spot welding electrode tip and a manual tip dress to which the cutter unit is attached.

1 Manual tip dress 2 Dresser body 2b Grip part 3 Cutter unit 4 Motor 5 Switch lever 6 Rotating holder 6c Tip receiving part 6d Mounting surface 7 Cutting cutter 7a Screw insertion hole 8 Penetration part 8a Wide part 10 Screw 10a Head 11 Power supply Tip 11a Tip C1 Rotation axis

Claims (4)

1. A cutter for chip dress equipped with a rotation holder that rotates around the center of rotation and a cutting cutter that is detachably attached to the rotation holder and that cuts the tip of the electrode tip for spot welding by the rotation operation of the rotation holder. It ’s a unit,
   The rotary holder is provided on one side in the direction of the center of rotation, and at the time of cutting, the tip receiving portion that receives the tip of the electrode tip and the tip receiving portion that penetrates in the direction of the center of rotation and opens to the tip receiving portion. The inner side surface is provided with a penetration portion to which the cutting cutter is attached in a posture extending in the radial direction and the rotation axis direction of the rotation holder.
   A cutter for chip dress, characterized in that a wide portion set to a dimension wider in the radial direction of the rotation holder than on one side in the rotation axis direction is provided on the other side of the penetration portion in the rotation axis direction. unit.
2. In the chip dress cutter unit according to claim 1,
   The cutting cutter is attached to the rotary holder in a posture extending radially outward from the center of rotation.
   The wide portion has a shorter dimension in the rotation axis direction of the other half region of the rotary holder than the region of one half of the rotary holder to which the cutting cutter is mounted with the mounting surface of the cutting cutter as a boundary. A cutter unit for chip dress, which is characterized by being provided by making it into a shape.
3. In the chip dress cutter unit according to claim 1 or 2.
   The cutting cutter has a plate-like shape and has a screw insertion hole penetrating in the plate thickness direction, and is attached to the rotation holder by screwing a screw inserted through the screw insertion hole into the rotation holder.
   The tip dress cutter unit is characterized in that the screw insertion hole is provided at a position corresponding to the wide portion.
4. The chip dress cutter unit according to any one of claims 1 to 3.
   A dresser main body that rotatably supports the cutter unit at one end around the center of rotation, while a grip portion that is gripped by the user during operation is provided at the other end.
   A motor provided inside the dresser body to rotate and drive the cutter unit,
   It is rotatably supported on the other side of the dresser body and is rotated to the side approaching the grip portion to start the motor, while it is rotated to the side away from the grip portion to stop the motor. A manual tip dress that features a switch lever and.

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