KR101576593B1 - Tip dressing apparatus for electric resistance welding machine - Google Patents

Abstract

The present invention relates to a tip dressing apparatus for an electric resistance machine and, more specifically, relates to the tip dressing apparatus for the electric resistance welding machine which prevents a fault of a welded product due to dressing error by testing the dressing apparatus in case of separating a bite holder by sensing a separation of the bite installed in the bite holder of the dressing apparatus. According to the present invention, the tip dressing apparatus for the electric resistance welding machine comprises: the bite holder where the bite is installed; a driving part to rotate the bite holder; and a control part which controls the driving part for the bite to cut a front end of a welding tip by rotation of the bite holder if the welding tip of the electric resistance welding machine approaches the bite of the bite holder. The bite holder has a semi-spherical cutting groove corresponding to a front end shape of the welding tip on a center, and has an installation part for the bite to be installed in a part where one side is cut. The bite is located on the installation part, and comprises a bite fixing part combined to the bite holder by a combining bolt in order to pressurize an outer circumference of the bite such that the bite is located on the installation part and adheres to the installation part. According to the bite fixture, a sensing part protruded to the outside of the bite holder is formed, comprising a sensing sensor to sense a sensing part of the bite fixture. The control part rotates the bite holder in case there is the sensing part by receiving a signal to sense the sensing part by the sensing sensor, and generates an abnormal signal if there is no sensing part.

Description

TECHNICAL FIELD [0001] The present invention relates to a tip dressing apparatus for electrical resistance welding,

The present invention relates to a tip dressing apparatus for electric resistance welding, and more particularly, to a wire dressing apparatus for electric resistance welding, which detects whether or not a bite attached to a bite holder of a dressing apparatus is separated, To a tip dressing apparatus for electric resistance welding.

Generally, electric resistance welding is a welding method in which electric current is applied to an object to be welded and electric resistance heat is generated at the contact portion to make the base material molten and to apply external force. Spot welding, stud welding, projection welding, have.

Among them, spot welding and stud welding are a welding method using an electrode tip. Spot welding is a method in which both surfaces of a metal plate are pressed with an electrode tip while current is applied thereto, And a current is applied while one side of the metal plate is stacked and one side is pressurized with an electrode tip.

Such a welding method is widely used when a spot or a stud welder is mounted on an industrial robot and is mainly used for welding a panel or the like in an assembling line of an automobile or a train. Since high heat and pressure are applied to the electrode tip, The pressing operation of the tip is deformed, or an oxide film is formed to cause a welding defect. Therefore, the pressed portion of the electrode tip is regularly cut using a tip dresser to restore the shape and remove the oxide film.

If such a welding tip dressing is not properly performed, the quality of the welding product will be affected. In particular, if the welding process is not followed and a subsequent process is performed, the finished product is manufactured in a state of welding defect of the welding product. It causes damage.

Therefore, in the dressing apparatus, an attempt is made to detect whether or not the dressing is abnormal. For example, Korean Patent Registration No. 10-1364980 discloses a 'tip dressing inspection system and method' for analyzing the motor load current of a tip dresser and the amount of cutting of a welding gun tip to diagnose defective polishing and failure of a tip dressing system Korean Patent Laid-Open No. 10-2010-0025092 discloses a technique of installing a sensor in a gear and housing to transmit power by a bite holder in a welding tip dresser and detecting a malfunction of the tip dresser by detecting whether the bite is rotating or not A malfunction detection device for a welding gun tip dressing machine of a welding robot '.

The above-described malfunction detection technology of the tip dressing apparatus is a technique of detecting rotation or rotation degree of a bite holder or a power transmission structure equipped with a bite and detecting a malfunction according to the rotation. However, the above-described malfunction detection technology of the tip dressing apparatus is recognized as a normal rotation even if the bite mounted on the holder is released and the welding tip is not dressed. As a result, .

Korean Patent No. 10-1364980: tip dressing inspection system and method Korean Patent Laid-Open No. 10-2010-0025092: Malfunction Detection Device of Welding Gun Tip Dressing Machine of Spot Welding Robot

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to provide a dressing apparatus, which detects whether or not a bite attached to a bite holder of a dressing apparatus is detached, Which can prevent defects of the tip dressing device for electric resistance welding.

According to another aspect of the present invention, there is provided a tip dressing apparatus for electric resistance welding, comprising: a bite holder having a bite; a driving unit for rotating the bite holder; And a control unit for controlling the driving unit such that a byte holder is rotated to cut a tip of the welding tip when the tip is approached, wherein the byte holder has a tip shape of a welding tip Shaped cutting groove corresponding to the cut-out portion, and a mounting portion for mounting the bite is formed at a portion where one side is cut out, the bite is positioned at the mounting portion, and the bite is positioned at the mounting portion and brought into close contact with the mounting portion A bite connected to the bite holder by a coupling bolt to press the outer surface of the bite; Wherein the bite fixture is provided with a sensing part protruding outside the bite holder and a sensing sensor for sensing the sensing part of the bite fixture is provided and the control part detects whether or not the sensing part senses And when the sensing unit is present, rotates the byte holder, and generates an abnormal signal in the absence of the sensing unit.

The tip dressing apparatus for an electric resistance welder according to the present invention is characterized in that the sensing part of the bite fixture protrudes outside the upper part of the bite holder.

Further, in the tip dressing apparatus for an electric resistance welder according to the present invention, the bite fixture is provided with a latching end having an upper end and a lower end protruding inwardly, and the sensing part of the bite fixture has a latching end .

In the tip dressing apparatus for an electric resistance welding machine according to the present invention, a support end for catching the bite mounted on the mounting portion so as not to be detached outside is protruded from the mounting portion of the bite holder, And a bolt fastening hole for screwing the fastening bolt to the inside of the through-hole is formed, and the bite is fitted to the mounting portion so that the outer side is hooked on the supporting end And a through portion formed by being cut in a semicircular shape so as to form a circular passage through which the engaging bolt passes is formed in a state of being fitted to the through groove formed in the supporting end in a state of being mounted, A bolt insertion hole communicating with a circular passage formed in the passing portion is formed, The bolt insertion hole is inserted characterized in that through the passage of the supporting circular stage provided on the portion passing through the groove and the passage of the byte of which is screw fastened to the bolt fastening hole.

The tip dressing apparatus for an electric resistance welder according to the present invention is characterized in that a side surface of the support end of the bite holder and a side surface of the bite in a state of being mounted on the mounting portion are formed to form the same surface, And a groove is formed at a side of the support end of the bite holder so as to be cut at an edge of the bite groove, the bite being formed at an edge of an entrance of the passage, Wherein the fixing hole is formed with a seating which is inserted into a groove formed by fitting a seating groove formed in the support end and a seating groove formed in the bite at an inner surface contacting the side surface of the support end and the side surface of the bite, And protrusions are protruded.

According to the above-described structure, the tip dressing apparatus for electric resistance welding according to the present invention detects whether or not the bite mounted on the bite holder of the dressing apparatus is separated, and checks the dressing apparatus when the bite is released. It is possible to prevent defects of the display device.

1 is an exploded perspective view showing a tip dressing apparatus for electric resistance welding according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a state in which a bite holder of a tip dressing apparatus for electric resistance welding according to an embodiment of the present invention and a structure coupled thereto are combined;
FIG. 3 is an exploded perspective view illustrating a holder of a tip dressing apparatus for electric resistance welding according to an embodiment of the present invention and a structure coupled to the holder. FIG.
4 is a cross-sectional view taken along line A-A '

Hereinafter, a tip dressing apparatus for battery resistance welding according to the present invention will be described in detail with reference to embodiments shown in the drawings.

FIG. 1 is an exploded perspective view showing a tip dressing apparatus for electric resistance welding according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a tip holder of the tip dressing apparatus for electric resistance welding according to an embodiment of the present invention, FIG. 3 is an exploded perspective view showing a holder of a tip dressing apparatus for electric resistance welding according to an embodiment of the present invention, A-A '.

Referring to the drawings, a tip dressing apparatus 1 for an electric resistance welder according to an embodiment of the present invention includes a base portion 11, a housing 12 supported by the base portion 11, (20) mounted rotatably on the holder mounting portion (14) and a drive motor (13) generating a rotational force are mounted on the holder mounting portion (14) A control unit for controlling the operation of the driving unit in cooperation with a driving unit provided inside the housing 12 and a control unit for controlling an electric resistance welder (not shown in the drawing) (Not shown).

The tip dressing apparatus 1 for an electric resistance welder according to the present invention constructed as described above is characterized in that when the welding tip (not shown in the drawing) of the electric resistance welder approaches the bite 22 mounted on the bite holder 21, The drive unit rotates the byte holder 21 under the control of the control unit so that the cutting tool 22 cuts the leading end of the cutting tool.

The present invention relates to a structure of each of the bite holder 21, the bite 22 and the bite fixture 23 in the above-described structure and the structure in which the bite 22 is inserted into the bite holder 21 from the bite holder bundle 20 and the detachment of the bite fixture 23 by the detection sensor 15, that is, whether or not the bite 22 is detached, are main features. Therefore, the present invention will be described in detail below . 2 to 3 show a structure in which a bite 22 is coupled to a bite holder 21 by a bite fixture 23 in a tip dressing apparatus 1 for an electric resistance welder according to an embodiment of the present invention .

2 to 3, the bite holder 21 has a generally circular shape as viewed from the upper surface, and a hemispherical cut groove 211 corresponding to the tip of the welding tip is formed at the upper center. The bite holder 21 has a shape cut out on one side at a side corresponding to approximately four quarters, and a mounting portion 212 for mounting the bite is formed on one side of the cut portion. The bite (22) is tightly coupled to the mounting portion (212). Supports 213 and 214 are formed on the inner and outer sides of the mounting portion 212 so as to be engaged without being pushed outward in the center direction and in the radial direction with respect to the center of the byte holder 21 . As a result, the mounting portion 212 has a concave groove shape between the inner and outer supporting ends 213 and 214. The inner and outer supporting ends 213 and 214 of the bite 22 are supported by the inner and outer supporting ends 213 and 214, And has a structure in which it is closely attached to the mounting portion 212. Referring to the drawing, a supporting end 214 located on the outside is protruded and formed so as to catch the byte 22 mounted on the mounting portion 212 outside the mounting portion 212 of the byte holder 21, The supporting end 214 located on the outside of the mounting portion 212 is formed such that the side surface of the supporting portion 214 is formed to have the same side surface of the bite 22 in a state where the bite 22 is mounted on the mounting portion And the bite fixture 23 is mounted so as to simultaneously press the side surface of the bite 22 and the lateral side of the supporting end 214 positioned at the outside at the boundary at the boundary.

On the other hand, in order to fasten and pass the bolt 24 for fixing the bite 22 and the bite fixture 23 to the bite holder 21, the mounting portion 212 and the supporting end 214 located on the outside thereof And a bolt fastening hole 215 for screw tightening with the passage groove 216 are formed. The through groove 216 is formed in the outer circumferential surface of the mounting portion 212 so that the coupling bolt 24 can pass through a boundary between the supporting end 214 and the mounting portion 212, (214). A bolt fastening hole through which the engaging bolt 24 is screwed into the through hole 216 is formed at the boundary between the mounting portion 212 and the supporting end 214 located on the outer side. The passage groove 216 is aligned with the passing portion 222 of the bite 22 to form a circular hole.

On the other hand, a seating groove 216a is formed at a side edge of the supporting end 214 located at the outer side of the mounting portion 212 and at the edge of the passage groove 216, The bite fixture 23 can be easily separated from the bite 233 by fitting the bite 233 of the bite fixture 23 into the bite hole 223 formed in the bite 22, .

The bite 22 is connected to the bite holder 21 by the bite fixture 23 and cuts the tip of a welding tip (not shown in the figure) which is brought close to the rotation of the bite holder 21. [ Referring to the drawing, the upper portion of the bite 21 has an arc-shaped cutting edge 221 corresponding to the tip of the welding tip to be cut. The bite 22 is mounted on the mounting portion 212 so that the inside and the outside of the bite 22 are respectively hooked on the supporting ends 213 and 214 of the bite holder 21. The bite 22 is fitted into the through hole 216 formed in the support end 214 located on the outer side of the mounting portion 212 while being mounted on the mounting portion 212, A semicircular passage portion 222 is cut and formed. A semicircular seating groove 223 is cut out at the entrance edge of the passing portion 222 at the outer side of the bite 22 where the bite fixture 23 is in contact with the seating groove 223, A seat recess 216a formed in a support end 214 located on the outer side of the seat portion 212 is formed so as to form a seat groove into which the seat projection 232 of the seat fastener 23 is inserted do.

The bite fixture 23 is configured to tightly fix the bite 22 to the bite holder 21 and to detect whether the bite sensor 23 is provided with a sensing unit and which will be described later.

The bite fixture 23 is fastened to the bite holder 21 by the coupling bolt 24 so that the bite 22 located in the mounting portion 212 is pressed against the mounting portion 212, Lt; / RTI > A bolt insertion hole 231 is formed at the center of the bite fixture 23 for insertion of the coupling bolt 24 and a head mounting end 233 for receiving the head of the coupling bolt 24 is installed outside And cut. On the other hand, the bite fixture is formed in such a manner that the bite fixture 232 is protruded so as to be in tight contact with the side of the bite 22 and the supporting end 214 supporting the outside of the bite 22, Referring to the drawing, the seating protrusion 232 supports the supporting end 214 and the bite (not shown) at a side surface of the supporting end 214 positioned outside the mounting portion 212 and an inner side contacting the side surface of the bite 22 22 are formed to protrude from the inside of the bite fixture 23 so as to be inserted into a fitting groove formed by fitting the fitting grooves 216a, At the upper end and the lower end of the bite fixture 23 are hooked ends 234 and 235 protruding inwardly so as to be caught by the upper and lower ends of the bite holder 21 without being detached from the bite fixture 23 in a fixed state .

The present invention is characterized in that the detachment of the bite 22 is detected by detecting the detachment of the bite fixture 23 for pressing and fixing the bite 22. For this purpose, A sensing part protruding outside the byte holder 21 is formed. The sensing unit of the bite fixture 23 is preferably protruded outside the upper portion of the bite holder 21 in order to expose the sensing unit to the outside in a state where the bite holder bundle 20 is mounted. The present invention is characterized in that the sensing unit is configured by the above-described latching end (234). In other words, a latching end 234 protruding upwardly and one side is formed at the upper end of the bite fixture 23, which protrudes to the outside of the bite holder 21, And an engaging end 234 formed at the upper end of the engaging portion 234.

The coupling bolt 24 is configured to integrally connect the bite 22 and the bite fixture 23 to the bite holder 21. [ The coupling bolt 24 is inserted into the bolt insertion hole 231 and inserted into the through hole 216 of the supporting end 214 located at the outer side of the mounting portion 212 and the passing portion 222 of the bite 22, And passes through a circular passage formed in the bolt fastening hole 215 to be screwed into the bolt fastening hole 215.

The detection sensor 15 is configured to detect whether or not the bite fixture 23 securing the bite 22 is detached to detect whether the bite 22 is detached. That is, the sensing sensor 15 is provided on the holder mounting part 14 to sense the sensing part of the bite fixture 23 protruded upward from the bite holder 21.

The control unit (not shown) receives a signal indicating whether the sensing unit 15 senses the sensing unit 15, rotates the byte holder 21 when the sensing unit 15 is present, and generates an abnormal signal if there is no sensing unit The dressing operation is stopped and the operator is informed to take action.

The drawing and the tip dressing apparatus for electric resistance welder described above are only one embodiment for carrying out the present invention, and should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is defined only by the matters set forth in the following claims, and the embodiments improved and changed without departing from the gist of the present invention are obvious to those having ordinary skill in the art to which the present invention belongs It will be understood that the invention is not limited thereto.

11 base
12 Housing
13 drive motor
14 holder mounting portion
15 detection sensor
20 byte holder group
21 byte holder
211 Cutting groove
212 mounting portion
213, 214
215 bolt tightening hole
216 through home
216a seat groove
22 bytes
221 cutting edge
222 passing portion
223 seat home
23-byte fixture
231 bolt insertion hole
232 Placement projection
233 Head rest
234, 235
24 coupling bolts

Claims (5)

A driving unit for rotating the byte holder, and a driving unit for driving the driving unit such that when the welding tip of the electric resistance welder approaches the byte holder, the byte holder is rotated to cut the tip of the welding tip into a byte, And a controller for controlling the tip dressing apparatus,
Wherein the bite holder has a hemispherical cutting groove corresponding to a tip end of the welding tip at the center, a mounting portion for mounting the bite is formed in a portion where one side is cut,
The bite being located in the mounting portion,
A bite fixture is provided which is coupled to the bite holder with a coupling bolt to press the outer surface of the bite so that the bite is located at the mounting portion and is brought into close contact with the mounting portion,
The bite fixture is provided with a sensing part protruding outside the bite holder,
A detection sensor for sensing the sensing unit of the bite fixture is provided,
Wherein the control unit receives a signal indicating whether the sensing unit is sensed by the sensing sensor, and rotates the byte holder in the presence of the sensing unit and generates an abnormal signal in the absence of the sensing unit. The method according to claim 1,
Wherein the sensing part of the bite fixture protrudes outside the upper portion of the bite holder. 3. The method of claim 2,
Wherein the bite fixture is formed with a latching end whose upper and lower ends protrude inward,
Wherein the sensing unit of the bite fixture is constituted by a latching end formed at an upper end of the bite fixture. 4. The method according to any one of claims 1 to 3,
A support end for catching the bite mounted on the mounting portion is formed on the outer side of the mounting portion of the bite holder so that the bolt can pass through the boundary between the supporting end and the mounting portion. And a bolt fastening hole through which the fastening bolt is fastened to the inside of the through groove is formed,
The bite is mounted on the mounting portion so that its outer side is caught by the supporting end, and is fitted with a through groove formed in the supporting end in a mounted state, so that a semicircularly formed passage portion is formed so as to form a circular passage through which the coupling bolt passes ,
Wherein the fixing hole is formed with a bolt insertion hole communicating with the passage groove of the support end and the circular passage formed in the passage portion of the bite,
Wherein the coupling bolt is inserted into the bolt insertion hole and passes through a circular passage formed in the passage groove of the supporting end and the passing portion of the bite to be screwed into the bolt fastening hole. 5. The method of claim 4,
Wherein a side surface of the support end of the byte holder and a side surface of the byte in a state of being mounted on the mounting portion are formed to form the same surface,
Wherein the fixture is in contact with a side surface of the support end of the bite holder and a side surface of the bite,
A seating groove is formed at a side of the support end of the bite holder at an edge of the passage groove,
Wherein the bite has a seating groove formed at an outer edge of the entrance portion of the passage portion,
Wherein the fixing hole is formed with a mounting projection formed in the supporting end and an insertion protrusion inserted into a groove formed by matching the mounting groove formed in the supporting end, at a side surface of the supporting end and an inner surface contacting the side surface of the byte, Tip dressing device for electrical resistance welder.

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