JP2020199554A - Chip dresser - Google Patents

Abstract

To provide a chip dresser which surely prevents chips from scattering to a device periphery.SOLUTION: A suction unit 8 is mounted on a lower side of a body case 2 through a plate-like bracket 9. The suction unit 8 sucks chips M1 that are generated in a through part 4a of a rotary holder 4 during a cutting operation and fall downward from a lower communication hole 20b of a storage case 2. The plate-like bracket 9 has a notch recess 9 released to one end edge part, and is mounted on the storage case 2 whose one end side is positioned on the suction unit 8 side and the other end side covers a region on a farther side from the suction unit 8 in the lower communication hole 20b, and a depth side region of a notch recess 9a is positioned corresponding to a curve recess 4c of the rotary holder 4.SELECTED DRAWING: Figure 5

Description

The present invention relates to a tip dresser that cuts the tip of an electrode tip for spot welding.

Traditionally, spot welding has been frequently used in automobile production lines to assemble car bodies. In the spot welding, an oxide film adheres to the tip of the electrode tip when the welding operation is repeated, and if welding is performed in that state, the quality of the welded portion deteriorates. Therefore, the tip of the electrode tip is periodically used by a tip dresser. It is necessary to remove the oxide film by cutting.

By the way, if chips generated when cutting an electrode tip with a chip dresser scatter and adhere to a drive unit of another device, the load on the drive unit is increased, and in the worst case, the device fails. In general, it is devised so that chips do not scatter around.

For example, the chip dresser disclosed in Patent Document 1 includes a storage case having a hollow portion inside, and the storage case has a position where an upper communication hole and a lower communication hole communicating with the hollow portion face each other in the vertical direction. Is formed in. A rotary holder is rotatably supported by a housing case around a rotation axis extending in the vertical direction between the upper communication hole and the lower communication hole in the hollow portion. An upper curved recess that opens upward is formed at a position facing the upper communication hole of the rotary holder, while a lower curved recess that opens downward is formed at a position facing the lower communication hole of the rotary holder. Has been done. The rotary holder is formed with a notch that gradually expands in the circumferential direction around the center of rotation and opens laterally and penetrates up and down as it goes outward from the center of rotation, and is formed on one inner surface of the notch. Is attached with a plate-shaped cutting plate having a pair of cutting edges at the top and bottom. Then, one of the pair of electrode tips facing each other in the rotated state is inserted into the upper curved recess through the upper communication hole, and the other is inserted into the other curved recess through the lower communication hole. By doing so, the tip of each electrode tip is cut with a cutting plate.

A suction unit capable of sucking chips is attached to the lower side of the storage case via a mounting bracket. The suction unit includes a tubular body that internally generates an air flow along the center line of the cylinder by introducing compressed air inside, and a chip guide body having a chip guide passage inside, and the chip guide is provided. One end of the body is provided with a chip suction port that approaches the lower communication hole, while the other end of the chip guide is connected to the upstream opening of the tubular body. In the suction unit, when chips generated in the notch during cutting operation fall downward through the lower communication hole, the air flow generated inside the tubular body cuts the chips from the chip suction port of the chip guide. The powder is sucked into the chip guide. Then, the chips sucked into the inside of the chip guide from the chip suction port pass through the inside of the chip guide and the inside of the tubular body in order, and are transported to the chip collector. , Chips generated during the cutting work of the electrode tip are prevented from being scattered around the device.

Korean Registered Patent No. 10-1696263

By the way, in the chip dresser of Patent Document 1, the tubular body in the suction unit has a posture in which the center line of the tubular body extends in the vertical direction, and the chip guide has a shape in which the chip guide extends in the horizontal direction. Therefore, when an air flow is generated inside the tubular body, the air sucked from the chip suction port of the chip guide moves in the horizontal direction and then moves downward toward the inside of the tubular body. There is a problem that the air flow is turbulent in the region where the traveling direction of the air changes, and the suction capacity tends to decrease.

Further, when the tubular body of the suction unit is arranged in a posture in which the center line of the tubular body extends in the vertical direction as in Patent Document 1, the outer wall of the tubular body is in a state of approaching the rotation axis of the rotary holder. For example, when an electrode tip attached to the shank tip of a large welding gun is attempted to approach the lower communication hole of the housing case, a part of the welding gun may come into contact with the suction unit, which is versatile. There is also the problem that the structure is low.

The present invention has been made in view of these points, and an object of the present invention is to have a high suction capacity and to widen the available space under the apparatus to cope with the use of various welding guns. The purpose is to provide a highly versatile chip dresser.

In order to achieve the above object, the present invention is characterized in that the mounting posture of the tubular body in the suction unit is devised.

Specifically, a storage case having a hollow portion inside and having an upper communication hole and a lower communication hole that face each other and communicate with the hollow portion, and the upper communication hole and the lower side in the hollow portion. Rotation that is rotatably supported by the storage case between the side communication holes and has a pair of curved recesses corresponding to the upper communication hole and the lower communication hole, and a through portion penetrating along the rotation axis. One of a holder, a cutting member attached to the inner surface of the penetrating portion, and a pair of spot welding electrode chips facing each other in a rotated state of the rotating holder are curved recessed in one through the upper communication hole. A tip dresser configured to cut the tip of each electrode tip with the cutting member by inserting the other into the curved recess of the other through the lower communication hole. , The following measures were taken.

That is, in the first invention, a chip suction port provided at a position where chips generated in the penetrating portion during a cutting operation and falling downward through the lower communication hole approach the lower communication hole. The suction unit is provided with a suction unit for sucking from the suction unit and a plate-shaped bracket for attaching the suction unit to the lower side of the storage case. The plate-shaped bracket has a notch recess opened at one end and one end side is the suction unit side. The other end of the lower communication hole covers the area far from the suction unit in the lower communication hole, and the inner region of the notch recess corresponds to the curved recess of the rotary holder. It is characterized in that it is attached to the storage case.

In the second invention, in the first invention, the chip suction port has a first suction region that opens upward and a second suction region that is continuous with the first suction region and opens sideways. The suction unit has a region, and the suction unit is attached to the storage case so that the first suction region covers the open side region of the notch recess.

In the first invention, the chips collected in the notch will fall from the lower communication hole only when the notch reaches the suction unit side during the rotation of the rotary holder. Therefore, the chips falling from the lower communication hole are easily sucked from the chip suction port, and the chips can be reliably prevented from scattering around the device.

In the second invention, chips that fall from the region far from the suction unit in the notch of the rotary holder pass through the inner region of the notch recess and enter the suction unit from the second suction region of the chip suction port. Chips that are sucked and fall from the area near the suction unit in the notch pass through the open side area of the notch recess and are sucked into the suction unit from the first suction area of the chip suction port. Become. Therefore, the chips falling from the notch can be reliably sucked into the chip guide passage.

It is a perspective view of the chip dresser which concerns on embodiment of this invention. It is an enlarged exploded perspective view of the chip dresser which concerns on embodiment of this invention. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. It is an IV arrow view of FIG. After FIG. 4, it is a figure which shows the state which the rotary holder rotates and the notch part reaches the suction unit side.

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.

1 to 3 show a chip dresser 1 according to an embodiment of the present invention. The tip dresser 1 is for simultaneously cutting the curved tip 10a of a pair of spot welding electrode tips 10 which are fitted into the tip of the shank G1 of a welding gun (not shown) and face each other, and is hollow inside. It has a main body case 2 (accommodation case) having a portion 20 and having a substantially L-shape in a side view.

The main body case 2 has a bottomed cylindrical motor accommodating portion 2a for accommodating a drive motor (not shown), and extends substantially horizontally from the upper portion of the motor accommodating portion 2a in a substantially horizontal direction, and has a substantially drip shape in a plan view. A shock absorbing mechanism 2c for absorbing the shock applied to the main body case 2 is attached to the side surface of the motor housing 2a on the base end side of the holder housing 2b.

The holder accommodating portion 2b has a thick plate shape, and an upper communication hole 20a and a lower communication hole 20b are formed in the center of the extending side thereof so as to face each other vertically and communicate with the hollow portion 20.

Between the upper communication hole 20a and the lower communication hole 20b inside the holder accommodating portion 2b, a ring-shaped output gear 3 can rotate around a rotation axis C1 extending in the vertical direction via a pair of upper and lower bearings 7. A drive motor pivotally supported by the holder accommodating portion 2b and accommodating in the motor accommodating portion 2a rotates the output gear 3 via a gear meshing mechanism (not shown).

The output gear 3 is provided with mounting holes 3a penetrating vertically, and a disk-shaped rotary holder 4 is mounted in the mounting holes 3a.

The rotary holder 4 has a substantially C shape in a plan view, and gradually expands in the circumferential direction around the rotary axis C1 as it goes outward in the radial direction from the rotary axis C1 to open outward and vertically. It has a notch 4a (penetration portion).

That is, the notch portion 4a penetrates along the rotation axis C1.

Further, a flange portion 4b is formed on the upper peripheral periphery of the rotary holder 4 so as to extend outward from other portions.

Further, on the upper and lower surfaces of the rotary holder 4, a pair of curved recesses 4c whose diameters gradually decrease toward the central portion of the rotary holder 4 are formed symmetrically in the direction of the rotation axis C1, and the curved recesses 4c communicate with each other on the upper side. It corresponds to the hole 20a and the lower communication hole 20b, respectively.

The shape of the curved recess 4c corresponds to the curved shape of the tip portion 10a of the electrode tip 10, and the tip portion 10a of the electrode tip 10 is inserted in a state where the central axis of the electrode tip 10 coincides with the rotation axis C1. It has become like.

A cutting cutter 5 (cutting member) for cutting the tip portion 10a of the electrode tip 10 is attached to one inner side surface of the notch portion 4a extending outward from the rotation axis C1.

The cutting cutter 5 is formed in pairs so that the cutting edge portions 5a extending in the direction intersecting the rotation axis C1 are symmetrical in the direction along the rotation axis C1, and the shape corresponds to each curved recess 4c. It is gently curved.

A chip scattering prevention cover 6 having a substantially ring shape is detachably attached to the outer peripheral edge of the flange portion 4b of the rotary holder 4.

As shown in FIG. 2, the chip scattering prevention cover 6 has an annular portion 6a that is externally fitted to the outer peripheral edge portion of the flange portion 4b of the rotary holder 4, and the annular portion 6a from the inner peripheral edge portion of the annular portion 6a. A plate-shaped portion 6b having a substantially fan shape in a plan view extending inward of the plate-shaped portion 6b is provided, and the plate-shaped portion 6b has an annular portion 6a having a curved elongated hole 6c penetrating in the plate thickness direction. Two are arranged side by side in the radial direction of.

When the annular portion 6a is fitted to the flange portion 4b of the rotary holder 4, the plate-shaped portion 6b closes the flange portion 4b side of the notch portion 4a in the rotary holder 4.

Then, as shown in FIG. 3, one of the pair of electrode tips 10 facing each other in the rotated state of the rotary holder 4 is inserted into the upper curved recess 4c through the upper communication hole 20a, and the other is lowered. By inserting it into the lower curved recess 4c via the side communication hole 20b, the tip portion 10a of each electrode tip 10 is cut by each cutting edge portion 5a of the cutting cutter 5.

A suction unit 8 for sucking chips M1 is attached to the lower part of the holder accommodating portion 2b of the main body case 2 via a mounting bracket 9.

The suction unit 8 has a substantially cylindrical tubular body 81 having an air passage 81a along the tubular center line C2 inside, and a chip guide provided on the upstream side of the tubular body 81 to guide the chips M1. It is provided with a chip guide 82 having a passage 80 inside, and a chip collector 83 arranged on the downstream side of the tubular body 81 and capable of collecting chips M1.

The tubular body 81 is in a posture in which the center line C2 of the cylinder intersects the extending direction of the holder accommodating portion 2b and extends diagonally downward while being away from the rotation axis C1.

When the compressed air is introduced into the tubular body 81, the compressed air is discharged toward the downstream side of the air passage 81a and the upstream side of the air passage 81a becomes a negative pressure, whereby the tubular body 81 is obliquely downward to the air passage 81a. An air flow X1 along the cylinder center line C2 is generated.

The chip guide body 82 has a shape that gradually extends away from the position near the lower communication hole 20b, has a chip suction port 82a at a position approaching the lower communication hole 20b, and has lower communication. The upstream opening of the tubular body 81 is connected to a position separated from the hole 20b and below the chip suction port 82a.

The chip guide body 82 has a substantially triangular shape when viewed from the front, and has a substantially semi-disc shape when viewed in a plan view with a pair of side wall portions 82b facing the extension direction of the holder accommodating portion 2b, and both sides. The upper wall portion 82c that closes approximately half of the side far from the lower communication hole 20b in the upper portion between the wall portions 82b and the lower wall portion 82d (interference avoidance portion) that closes the lower portion between the both side wall portions 82b are provided. The chip guide passage 80 is formed in a portion surrounded by 82b, an upper wall portion 82c, and a lower wall portion 82d.

That is, the chip guide passage 80 has a shape that gradually widens up and down as the distance from the chip suction port 82a increases.

The lower wall portion 82d extends diagonally downward from the peripheral edge of the opening of the chip suction port 82a along the cylinder center line C2 of the tubular body 81, and the extending end thereof is in the tubular body 81. It is connected to the lower end of the peripheral edge of the upstream opening.

The chip suction port 82a is composed of approximately half of the side close to the lower communication hole 20b in the upper part between the side wall portions 82b, and has a first suction region R1 that opens upward, and each side wall portion 82b and the lower wall portion 82d. It is composed of a portion surrounded by the edge on the lower communication hole 20b side, and has a second suction region R2 that is continuous with the first suction region R1 and opens laterally.

The chip collector 83 connects the storage box 83a having a substantially cylindrical shape capable of storing the chips M1 inside, the storage box 83a, and the downstream opening portion of the tubular body 81 to store the chips M1 in the air passage 81a. A connection pipe 83b that communicates with the inside of the box 83a is provided, and a large number of exhaust holes 83c for exhausting the internal air to the outside are formed on the wall of the connection pipe 83b on the storage box 83a side.

The mounting bracket 9 is a plate member extending in the horizontal direction having a substantially U-shape in a plan view, and has a notch recess 9a that opens at one end to an edge portion.

The mounting bracket 9 has one end side located on the chip guide body 82 side and the other end side covering the area far from the chip guide body 82 in the lower communication hole 20b, and the back side region of the notch recess 9a. Is attached to the holder accommodating portion 2b so as to correspond to the curved recess 4c located on the lower side of the rotary holder 4.

Further, the mounting bracket 9 is adapted to mount the chip guide body 82 to the holder accommodating portion 2b so that the first suction region R1 of the chip guide body 82 covers the open side region in the notch recess 9a.

Then, when the tip portion 10a of the electrode tip 10 is cut by the cutting cutter 5 in a state where the air flow X1 is generated in the tubular body 81, the notch portion of the rotary holder 4 is cut during the cutting operation of each electrode tip 10 by the cutting cutter 5. Chips M1 generated in 4a and falling downward through the lower communication hole 20b are sucked into the chip guide passage 80 from the chip suction port 82a, and enter the inside of the chip collector 83 via the air passage 81a. It is designed to be discharged.

Next, the cutting operation of the tip portion 10a of the electrode tip 10 by the tip dresser 1 will be described in detail.

First, as shown in FIG. 3, a drive motor (not shown) of the chip dresser 1 is rotationally driven to rotate the output gear 3, thereby rotating the rotary holder 4 around the rotation axis C1.

Further, by supplying compressed air to the inside of the tubular body 81 of the suction unit 8 using an air compressor (not shown), an air flow X1 is generated in the air passage 81a of the tubular body 81.

Further, the compressed air is discharged from the discharge nozzle (not shown) provided above the holder accommodating portion 2b toward the region on the surface of the rotary holder 4 on the suction unit 8 side.

Next, each of the pair of electrode tips 10 facing up and down is moved to the upper side and the lower side of the holder accommodating portion 2b, and the central axis of each electrode tip 10 is aligned with the rotation axis C1 of the rotation holder 4.

After that, both electrode tips 10 are brought close to each other. Then, the upper electrode tip 10 is inserted into the upper curved recess 4c of the rotary holder 4 through the upper communication hole 20a in the holder housing portion 2b, while the lower electrode tip 10 is inserted into the lower curved recess 4c of the rotating holder 4 through the upper communication hole 20a. It is inserted into the lower curved recess 4c of the rotary holder 4 through the side communication hole 20b. Then, the tip portion 10a of each electrode tip 10 is cut by the cutting cutter 5 attached to the rotary holder 4.

At this time, as shown in FIG. 4, the chips M1 generated from the tip portion 10a of each electrode tip 10 are notched in the rotating holder 4 when the notch portion 4a of the rotating holder 4 is not located on the suction unit 8 side. It collects in part 4a.

On the other hand, as shown in FIG. 5, when the rotary holder 4 rotates and the notch 4a of the rotary holder 4 reaches the suction unit 8 side, a discharge nozzle arranged above the holder accommodating portion 2b (not shown). The compressed air discharged from the chip enters the notch 4a through the elongated holes 6c of the plate-shaped portion 6b of the chip scattering prevention cover 6, and the chips M1 accumulated in the notch 4a are dropped downward.

Each chip M1 falling from the notch 4a tries to fall downward through the lower communication hole 20b, but the chip suction port is caused by the air flow X1 generated in the air passage 81a of the tubular body 81. Air flows from the chip guide passage 80 into the chip guide passage 80, and as shown in FIG. 3, a high-speed air flow (so-called air shield) toward the chip suction port 82a is generated in the region Z1 below the lower communication hole 20b by the air flow X2. Since it is generated, each chip M1 is sucked into the chip guide passage 80 through the chip suction port 82a. More specifically, the chips M1 that fall from the region far from the suction unit 8 in the notch 4a of the rotary holder 4 pass through the inner region of the notch recess 9a in the mounting bracket 9 and the chip suction port 82a. The chips are sucked into the chip guide passage 80 from the second suction region R2, and the chips that fall from the region near the suction unit 8 in the notch 4a pass through the open side region of the notch recess 9a. It is sucked into the chip guide passage 80 from the first suction region R1 of the suction port 82a. Therefore, the chips M1 falling from the notch 4a can be reliably sucked into the chip guide passage 80.

Further, only when the region of the lower communication hole 20b on the side far from the suction unit 8 is blocked by the mounting bracket 9 and the rotary holder 4 rotates and the notch 4a reaches the chip guide body 82 side. Since the chips M1 accumulated in the notch 4a are designed to fall downward from the lower communication hole 20b, the chips M1 falling from the lower communication hole 20b are easily sucked from the chip suction port 82a, and the apparatus It is possible to surely prevent chips from scattering around.

Each chip M1 that has entered the chip guide passage 80 from the chip suction port 82a moves toward the air passage 81a of the tubular body 81 mainly along the side wall portions 82b and the lower wall portion 82d by the air flow X2. To do. At this time, since the tubular body 81 is connected to the chip guide body 82 and tilted so that the cylinder center line C2 extends diagonally downward, the tubular body 81 passes through the chip guide passage 80 and is tilted. The amount of change in the traveling direction of the air flowing into the air passage 81a of 81 (the amount of change in the traveling direction of the air in the region Y1 of FIG. 3) is smaller than that of the chip dresser as in Patent Document 1. Therefore, the turbulence of the air flow in the continuous portion between the chip guide passage 80 and the air passage 81a is less likely to occur, and the suction capacity of the suction unit 8 can be enhanced.

Further, since the lower wall portion 82d extends diagonally downward from the periphery of the chip suction port 82a so as to be along the cylinder center line C2 of the tubular body 81, the inside of the chip guide body 82 as in Patent Document 1. Compared to the case where the bottom surface of the is curved, turbulence of the air flow is less likely to occur, and the suction efficiency can be further improved.

Further, since the extending end of the lower wall portion 82d is connected to the lower end portion of the peripheral edge of the upstream opening in the tubular body 81, air smoothly flows from the chip guide passage 80 to the air passage 81a of the tubular body 81. It will flow, and the suction force of the suction unit 8 can be further increased.

After that, each chip M1 that has reached the air passage 81a of the tubular body 81 passes through the air passage 81a and the connecting pipe 83b along the air flow X1 and is stored in the storage box 83a.

From the above, according to the embodiment of the present invention, the tip dresser 1 provided with the suction unit 8 having high suction performance can be obtained.

Further, since the tubular body 81 is inclined so as to gradually move away from the rotation axis C1 of the rotation holder 4 as it goes downward, the space S1 that can be used below the lower communication hole 20b in the holder accommodating portion 2b is wide. (See Fig. 3). Therefore, for example, even when cutting the tip portion 10a of the electrode tip 10 mounted on the shank tip of a large welding gun, contact of the welding gun with the suction unit 8 can be reliably avoided, and welding can be performed. The chip dresser 1 can be used regardless of the type and size of the gun.

Further, by inclining the tubular body 81, the tubular body 81 can be brought closer to the lower communication hole side while securing a wide space S1 below the lower communication hole 20b in the holder accommodating portion 2b. Therefore, the suction capacity of the suction unit 8 can be enhanced in this respect as well.

In addition to that, since the lower wall portion 82d of the chip guide body 82 extends diagonally downward along the cylinder center line C2 of the tubular body 81, the welding gun that approaches the holder accommodating portion 2b can be used. Further, it becomes difficult to come into contact with the suction unit 8, and it is possible to obtain a highly versatile tip dresser 1 that can be used when various welding guns are used.

Further, since the tubular body 81 is connected to the chip guide 82 in a posture in which the cylinder center line C2 extends in a direction extending in a direction intersecting the extending direction of the holder accommodating portion 2b, the motor accommodating portion in the holder accommodating portion 2b. The size of the extending portion from 2a can be shortened. Therefore, the tip dresser 1 can be made into a compact shape.

The present invention is suitable for a tip dresser that cuts the tip of an electrode tip for spot welding.

1 Tip dresser 2 Body case (storage case)
4 Rotating holder 4a Notch (penetration)
4c Curved recess 5 Cutting cutter (cutting member)
8 Suction unit 9 Plate-shaped bracket 9a Notch recess 10 Electrode tip 10a Tip part 20 Hollow part 20b Lower communication hole 82 Chip guide body 82a Chip suction port C1 Rotation axis C2 Cylinder center line M1 Chip R1 First suction area R2 2nd suction area X1 Air flow

Claims (2)

A storage case having a hollow portion inside, and having an upper communication hole and a lower communication hole that face each other and communicate with the hollow portion.
A pair of curved recesses and a rotation axis that are rotatably supported by the accommodating case between the upper communication hole and the lower communication hole in the hollow portion and correspond to the upper communication hole and the lower communication hole, respectively. A rotating holder with a penetrating portion penetrating along
The cutting member attached to the inner surface of the penetration part and
With the rotary holder rotated, one of the pair of spot welding electrode tips facing each other is inserted into one of the curved recesses through the upper communication hole, and the other is inserted through the lower communication hole. A tip dresser configured to cut the tip of each of the electrode tips with the cutting member by inserting it into the curved recess of the above.
A suction unit that sucks chips that are generated in the through portion during the cutting operation and fall downward through the lower communication hole from a chip suction port provided at a position close to the lower communication hole.
A plate-shaped bracket for attaching the suction unit to the lower side of the storage case is provided.
The plate-shaped bracket has a notch recess that opens at one end so that one end side is located on the suction unit side and the other end side covers a region of the lower communication hole far from the suction unit. Moreover, the tip dresser is attached to the storage case so that the inner region of the notch recess corresponds to the curved recess of the rotary holder. In the tip dresser according to claim 1,
The chip suction port has a first suction region that opens upward, and a second suction region that is continuous with the first suction region and opens laterally.
The suction unit is a tip dresser, characterized in that the first suction region is attached to the storage case so as to cover the open side region of the notch recess.