JP7440076B2 - Cutter unit for tip dressing and manual tip dressing - Google Patents

Description

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 equipped with the cutter unit.

Conventionally, for example, the tip dress disclosed in Patent Document 1 is a device that is manually operated by a user to cut the tip of an electrode tip for spot welding. Equipped with a dresser body. A cutter unit that rotates about a center line by a motor is pivotally supported at one end of the dresser main body, while the other end of the dresser main body is a grip portion that is gripped by a user. The cutter unit is composed of a short cylindrical rotating holder and a plate-shaped cutting cutter attached to the inside of the rotating holder. It is in a posture extending in the radial direction of the rotating holder. At the other end of the dresser body, there is a rotatable switch lever for switching between starting and stopping the motor, and a cutting cutter is inserted into the tip of the electrode tip with the center axis of the electrode tip aligned with the rotational axis. When the cutter unit is contacted from one end side, and the user rotates the switch lever toward the grip while gripping the grip and grips the switch lever together with the grip, the cutter unit rotates and the cutting cutter is rotated. The tip of the electrode tip is cut. Chips generated during cutting pass through a through-hole provided between the inner circumferential surface of the rotary holder and the cutting cutter, and are discharged from the other end of the cutter unit.

By the way, the cutter unit of Patent Document 1 has a structure in which only the cutting cutter contacts the tip when cutting the tip of the electrode tip. Therefore, if the cutting cutter is repeatedly used, a large load will be applied to the cutting cutter, and the life of the cutting cutter may be shortened.

In order to cope with this, for example, as in Patent Document 2, a concave tip receiving part for receiving the tip of the electrode tip is provided in the rotating holder, so that the tip of the electrode tip can be rotated not only by the cutting cutter but also by the rotating holder. It is conceivable to also contact the holder.

Japanese Patent Application Publication No. 2006-212685 International Publication No. 2013/061710

However, when the rotary holder is provided with a chip receiving part, the penetration part for passing the chips generated during cutting becomes narrower in the cutter unit, so each chip generated during cutting passes through the penetration part. It often gets stuck inside. Therefore, the user has to clean the penetrating portion every time the penetrating portion is clogged with chips and cutting operations are no longer possible, which may result in a poor usability.

The present invention has been made in view of these points, and its purpose is to prolong the life of a cutting cutter and to provide a comfortable usability that allows chips generated during cutting to be smoothly discharged. To provide a good cutter unit for chip dressing and a manual chip dress equipped with the same.

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

Specifically, it includes a rotary holder that rotates around a rotation axis, 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 movement of the rotary holder. The following measures were taken for the tip dress cutter unit.

That is, in the first invention, the rotary holder is provided on one side in the direction of the rotation axis, and includes a tip receiving part that receives the tip of the electrode tip during cutting, and a tip receiving part that penetrates in the direction of the rotation axis and receives the tip of the electrode tip during cutting. a penetrating portion opening in the tip receiving portion and on an inner surface thereof to which the cutting cutter is attached in a posture extending in the radial direction and the rotational axis direction of the rotary holder; The rotary holder is characterized in that a wide portion is provided that is wider in the radial direction of the rotary holder than on one side in the rotational axis direction.

In a 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 has a mounting surface of the cutting cutter as a boundary. The cutting cutter is provided by making the dimension of the other half of the rotary holder smaller in the direction of the axis of rotation than the half of the one side of the rotary holder to which the cutting cutter is attached. .

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

In a fourth invention, a manual tip dress includes the cutter unit for tip dressing according to any one of the first to third inventions, and supports the cutter unit at one end so as to be rotatable about the rotation axis. On the other hand, a dresser main body is provided with a gripping portion on the other end side for a user to grasp during operation, a motor provided inside the dresser main body for rotationally driving the cutter unit, and a motor that rotates on the other side of the dresser main body. a switch lever that is movably pivoted and rotated toward the grip to start the motor, and rotated to move away from the grip to stop the motor; It is characterized by the presence of

In the first invention, when cutting the tip of the electrode tip, the cutting cutter cuts the tip of the electrode tip while the tip of the electrode tip is received by both the tip receiving part of the rotary holder and the cutting cutter. I come to do it. Therefore, the load applied to the cutting cutter during cutting is reduced compared to the cutter unit having the structure as in Patent Document 1, and the life of the cutting cutter can be extended. In addition, the width of the through hole increases as it moves away from the cutting location, so even if the movement of chips decreases as the distance from the cutting location increases, it is difficult for chips to become clogged inside the through hole. . Therefore, the number of times the penetrating portion is cleaned can be reduced, making it more convenient to use.

In the second aspect of the invention, it is possible to relatively easily widen the area on the other side in the direction of the rotational axis in the penetrating portion, so that the cutter unit can be made at a low cost.

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

In the fourth invention, since the user can start and stop the rotational operation of the cutter unit while holding the tip dress with one hand, the device can be easily used.

FIG. 1 is a perspective view of a manual tip dress according to an embodiment of the present invention. 2 is a view taken along arrow II in FIG. 1. FIG. FIG. 1 is an exploded perspective view of a cutter unit according to an embodiment of the present invention. 4 is a view taken along the IV arrow in FIG. 3. FIG. 4 is a view taken along the V arrow in FIG. 3. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. FIG.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. It should be noted that the following description of preferred embodiments is essentially only an example.

FIG. 1 shows a manual tip dress 1 according to an embodiment of the invention. The manual tip dress 1 is for cutting the tip 11a of an electrode tip 11 (see FIG. 6) fitted into the shank of a spot welding gun (not shown), and approximately half of one longitudinal side is cut. The dresser main body 2 is made of metal and has a thick plate shape, while the other half of the dresser body 2 in the longitudinal direction has a substantially cylindrical shape.

A pair of circular openings 2a facing each other are formed on both sides in the thickness direction on one longitudinal side of the dresser body 2 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 longitudinal side of the dresser main body 2 is a grip part 2b that is gripped by the user during operation, and inside thereof is a motor 4 that rotationally drives the cutter unit 3 via a gear meshing mechanism (not shown). It is accommodated.

An elongated strip-shaped switch lever 5 is provided on the side of the grip portion 2b of the dresser body 2, and one end of the switch lever 5 is rotatably supported by the other end of the dresser body 2. .

The switch lever 5 is configured to start the motor 4 by rotating it toward the grip part 2b, and to stop the motor 4 by rotating it toward the side away from the grip part 2b. It is urged by a biasing member toward the side away from the grip portion 2b.

As shown in FIGS. 2 and 3, the cutter unit 3 includes a rotating holder 6 that is approximately C-shaped in plan view and whose center line coincides with the rotational axis C1, and a cutting machine that is detachably attached to the rotating holder 6. It is equipped with a cutter 7.

The rotation holder 6 has a notch 6a that gradually expands in the circumferential direction around the rotation axis C1 as it goes radially outward from the rotation axis C1, opens outward, and also opens on both sides in the rotation axis C1 direction. ing.

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

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

The shape of the tip receiving portion 6c corresponds to the curved shape of the tip 11a of the electrode tip 11, and the tip 11a of the electrode tip 11 is held in place when the center axis of the electrode tip 11 is aligned with the rotation axis C1. It is possible to accept it.

In the chip receiving portion 6c, a plurality of arc-shaped step surfaces 6e extending around the rotation axis C1 are formed in a continuous step-like manner 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 a continuous portion 6h of the horizontal portion 6f and the vertical portion 6g has a sharp shape with a right angle in cross section. I am doing it. Each continuous portion 6h is configured to come into contact with the tip 11a of the electrode tip 11 when the tip receiving portion 6c receives the tip 11a. In addition, in the rotary holder 6 of the embodiment of the present invention, both when the φ13 electrode tip 11 is received by the tip receiving part 6c and when the φ16 electrode tip 11 is received by the tip receiving part 6c, Each continuous portion 6h is designed to contact the surface of the tip 11a of the electrode tip 11.

On one inner surface of the notch 6a extending outward from the rotation axis C1, a mounting surface 6d recessed in a stepped shape and approximately T-shaped in side view is formed, where the cutting cutter 7 is attached. .

In the rotary holder 6, one half of the rotary holder 6 to which the cutting cutter 7 is attached with the mounting surface 6d as a boundary is defined as a region 6A, and the other half is defined as a region 6B.The rotation axis center C1 direction of the region 6B is 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 constitute the penetration part 8 of the present invention, and the penetration part 8 penetrates in the direction of the rotation axis C1 and opens into the chip receiving part 6c. A wide portion 8a is provided on the other side in the direction of the rotation axis C1, and is set to have a wider dimension in the radial direction of the rotary holder 6 than on one side in the direction of the rotation axis C1.

As shown in FIGS. 3 to 5, the cutting cutter 7 is formed by cutting a metal plate into 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 rotation axis C1 direction, and the cutting cutter 7 faces the mounting surface 6d, and the washer 9 and the screw insertion hole The rotary holder 6 can be attached to the rotary holder 6 by screwing screws 10 inserted through the screws 7a in order into 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 assumes a posture extending radially outward of 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 a rake surface portion 7b, and the rake surface portion 7b extends in the circumferential direction around the rotation axis C1. It extends to intersect with the other.

A flank portion 7c is provided on one side of the rake surface portion 7b in the direction of the rotation axis C1, and is substantially orthogonal to the rake surface portion 7b.

The flank portion 7c has a curved shape that gradually positions toward one side in the direction of the rotation axis C1 as it moves away from the rotation axis C1.

The flank portion 7c has a shape corresponding to the tip receiving portion 6c when the cutting cutter 7 is attached to the rotary holder 6, and the flank portion 7c has a shape corresponding to the tip receiving portion 6c when the cutting cutter 7 is attached to the rotary holder 6. When brought close, it faces the tip 11a of the electrode tip 11.

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

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

Then, when the electrode tip 11 with its central axis aligned with the rotational axis C1 is brought into contact with the rotating holder 6, the cutting cutter 7 comes into contact with the tip 11a of the electrode tip 11, and the tip 11a is It is cut by the cutting edge portion 7e, and chips M1 are generated.

Next, the operation of cutting the tip end 11a of the electrode tip 11 using the manual tip dresser 1 will be described.

First, the user grasps the grip part 2b of the manual tip dress 1, and as shown in FIGS. The tip portion 11a is received by the tip receiving portion 6c of the rotary 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 part 2b so that the switch lever 5 rotates toward the side approaching the grip part 2b. Then, the motor 4 is started, the cutter unit 3 rotates around the rotation axis C1, and the cutting blade 7e of the cutting cutter 7 comes into contact with the tip 11a of the electrode tip 11 to cut the tip 11a. In this way, when cutting the tip 11a of the electrode tip 11, the tip 11a of the electrode tip 11 is received by both the tip receiving part 6c of the rotary holder 6 and the cutting cutter 7, and the cutting cutter 7 cuts the tip 11a of the electrode tip 11. The tip 11a of the tip 11 is now cut. Therefore, the load applied to the cutting cutter 7 during cutting is reduced compared to 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 blade 7e of the cutting cutter 7 cuts the tip 11a of the electrode tip 11, each continuous portion 6h having a sharp cross section at the step surface 6e of the tip receiving portion 6c is cut into the tip 11a of the electrode tip 11. Contact. When the rotary holder 6 rotates in this state, each continuous portion 6h catches the tip 11a of the electrode tip 11 in a direction intersecting the central axis, and guides the rotation of the rotary holder 6 with respect to the tip 11a of the electrode tip 11. I come to do it. Therefore, during cutting work, when the rotary holder 6 rotates, the tip 11a of the electrode tip 11 slides relative to the tip receiving portion 6c in a direction intersecting its central axis, so that the rotational axis C1 is aligned with the central axis of the electrode tip 11. The cutting operation of the cutting cutter 7 can be stabilized without deviation from the position. Further, the contact area between the tip 11a of the electrode tip 11 and the tip receiving portion 6c is reduced, and the amount of biting of the cutting edge 7e into the tip 11a of the electrode tip 11 when the rotary holder 6 is rotated 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 are discharged to the outside of the cutter unit 3 after moving from the notch 6a to a space S1 (wide portion 8a) having a width wider than the notch 6a. In other words, the width of the penetrating portion 8 of the embodiment of the present invention increases as the distance from the cutting location increases, so even if the movement of the chips M1 decreases as the distance from the cutting location increases, the movement of the chips M1 becomes smaller as the distance from the cutting location increases. It is difficult for the penetrating portion 8 to become clogged inside. Therefore, the number of times the penetrating portion 8 is cleaned can be reduced, making it more convenient to use.

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

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

After cutting for a predetermined period of time, the user releases the switch lever 5 and rotates the switch lever 5 away from the grip part 2b to stop the motor 4 and remove the tip of the electrode tip 11. The cutting operation 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 start and stop the rotational operation of the cutter unit 3 while holding the gripping part 2b with one hand. It can be made into a good device.

In the embodiment of the present invention, the wide portion 8a of the penetrating portion 8 is located on the other side of the mounting surface 6d of the cutting cutter 7 than the one half region 6A of the rotary holder 6 to which the cutting cutter 7 is attached. This is provided by making the dimension of the half region 6B in the rotation axis C1 direction short, but by making the rotation holder 6 into a different shape, the other side region of the penetration part 8 in the rotation axis C1 direction can be made wider. It may be made into dimensions.

Furthermore, 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 an automatic tip dress.

INDUSTRIAL APPLICATION This invention is suitable for the cutter unit for tip dresses used for cutting the front-end|tip part of the electrode tip for spot welding, and the manual tip dress to which the said cutter unit was attached.

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

Claims (4)

A tip-dressing cutter comprising a rotary holder that rotates around a rotation axis, and a cutting cutter that is detachably attached to the rotary holder and that cuts the tip of a spot welding electrode tip by the rotational movement of the rotary holder. A unit,
The rotary holder is provided on one side in the direction of the rotation axis, and includes a tip receiving part that receives the tip of the electrode tip during cutting, and a tip receiving part that penetrates in the direction of the rotation axis and opens into the tip receiving part. , a penetrating portion on the inner surface in which the cutting cutter is attached in a posture extending in the radial direction and rotational axis direction of the rotary holder;
A cutter for tip dressing, characterized in that the other side of the through-hole in the direction of the rotation axis is provided with a wide part that is wider in the radial direction of the rotary holder than the one side in the direction of the rotation axis. unit. The chip dressing cutter unit according to claim 1,
The cutting cutter is attached to the rotation holder in a posture extending radially outward from the rotation axis,
The wide portion has a dimension in the direction of the rotational axis of the other half of the rotary holder that is shorter than a half region of one side of the rotary holder to which the cutting cutter is attached, with the mounting surface of the cutting cutter as a boundary. A cutter unit for chip dressing, characterized in that it is provided by shaping. The chip dressing cutter unit according to claim 1 or 2,
The cutting cutter has a plate shape and has a screw insertion hole passing through the plate thickness direction, and is attached to the rotation holder by screwing a screw inserted into the screw insertion hole into the rotation holder,
A cutter unit for chip dressing, wherein the screw insertion hole is provided at a position corresponding to the wide portion. A chip dressing cutter unit according to any one of claims 1 to 3;
a dresser main body having one end that rotatably supports the cutter unit around the rotation axis, and the other end having a grip portion that is gripped by a user during operation;
a motor that is provided inside the dresser main body and rotates the cutter unit;
Rotatably pivoted on the other side of the dresser body, rotated toward the grip to start the motor, and rotated toward away from the grip to stop the motor. A manual type tip dress characterized by being equipped with a switch lever and a switch lever.