WO2004073912A1

WO2004073912A1 - Multi-electrode holder for resistance welding

Info

Publication number: WO2004073912A1
Application number: PCT/JP2003/016048
Authority: WO
Inventors: Yoshikiyo Hidaka
Original assignee: Smk Co., Ltd.
Priority date: 2003-02-20
Filing date: 2003-12-15
Publication date: 2004-09-02
Also published as: AU2003289091A1; JPWO2004073912A1

Abstract

A small-sized lightweight electrode holder for resistance welding capable of performing a variety of resistance weldings by easily applying to an existing resistance welder and allowing the electrodes thereof to be effectively cooled, wherein the electrode holder (12) is allowed to be fitted to the existing resistance welder (1), as the electrode holder (12), a rotating holder (17) is rotatably fitted to a holder case (16) held by a lower horn (11) or the rotating holder (17) is rotatably fitted directly to the lower horn (11), a plurality of installation holes (20) are provided in the rotating holder (17), electrode tips (13b) are fitted into the installation holes (20) through intermediate adapters (21), a cooling water circulation passage (22) is formed in the holder case (16) and the rotating holder (17) or in the lower horn (11) and the rotating holder (17), and a plurality of bolt insert holes (s) are formed in the rotating holder (17) and fixing bolts (19) are inserted into the bolt insert holes (s) to fix the rotating holder (17) to the holder case (16).

Description

Description Multi-electrode holder for resistance welding Technical field

The present invention relates to an electrode holder for performing a plurality of types of resistance welding such as spot welding, nut welding, and port welding with a single welding machine. Background art

Conventionally, in a spot welding apparatus in which a plurality of welding guns can be switched, for example, a technique disclosed in Japanese Patent Application Laid-Open No. 2000-107287 is known. Electrode tips are attached to the tips of a plurality of sets of overhanging gun arms, the gun arms on one side of each set are moved by switching means to position the selected electrode tips, and then the gun arms are driven by the common gun driving means. By doing so, resistance welding is performed.

In addition, a technique such as Japanese Utility Model Laid-Open No. 63-1272775 is also known. In this technique, a plurality of different types of electrodes are provided on a disk-shaped electrode mounting body, and the electrode mounting body is rotated. The selected different electrode is moved to a position facing the electrode on the other side, and resistance welding is performed using the selected electrode.

However, none of the above-mentioned technologies can use an existing resistance welding device such as a spot welding machine, and in particular, as disclosed in Japanese Patent Application Laid-Open No. 2000-107287. Another problem is that the size of the equipment increases due to the need to provide multiple sets of gun arms, and in the latter case, the cooling mechanism for cooling the electrodes is used in the case of Japanese Utility Model No. 63-122,775. There is a problem that such a configuration is difficult.

Accordingly, an object of the present invention is to provide a small and lightweight electrode holder that can be easily applied to an existing resistance welding machine to perform various types of resistance welding, and that can effectively cool the electrodes. I do. Disclosure of the invention In order to achieve the above object, a multi-electrode holder for resistance welding according to the present invention is a multi-electrode holder for resistance welding in which a plurality of types of resistance welding can be performed by one resistance welding machine. A holder case held by a lower or upper horn; a rotary holder rotatably supported by the holder case; a plurality of mounting portions formed on the rotary holder; and a fixed rotation of the rotary holder. A fixing means that can be fixed at a position, and a cooling mechanism for cooling an electrode chip or the like mounted on the mounting portion are provided, and the rotary holder is rotated and fixed at a predetermined rotation angle to fix the electrode. It is characterized in that the electrode chips attached to each mounting part can be positioned at certain welding locations. ·

In this way, if a variety of electrode holders are mounted on the horn of a resistance welding machine, multiple types of resistance welding can be performed using the existing resistance welding machine, and multiple types can be obtained by rotating the rotary holder. By switching the type of electrode tip, the size and weight of the device can be reduced, and the equipment space can be reduced.

Here, the multiple types of resistance welding include, for example, spot welding, nut welding, port welding, and other projection welding.

Also, the horn to which the multi-type electrode holder is attached may be attached to only one of the upper horn and the lower horn, or may be attached to both.

The rotating holder can be rotated either manually or automatically. However, in comparison with three welding machines arranged side by side, the manual operation is smaller, lighter, requires less space, and has lower cost. In the case of automatic operation, equipment costs, equipment space, work setup, labor, labor costs, and welding tact time can be reduced.

Further, as a fixing means for fixing the rotary holder to the holder case, for example, a structure in which a fixing pin is inserted from the rotary holder toward the holder case can be applied.

In addition, the other electrode holder for resistance welding according to the present invention can be used with a single resistance welding machine. In a multi-electrode holder for resistance welding capable of performing a plurality of types of resistance welding, a rotary holder rotatably held by a horn at a lower portion or an upper portion of the resistance welding machine, and a plurality of mountings formed on the rotary holder. And a fixing means capable of fixing the rotary holder at a fixed rotation position, and a cooling mechanism for cooling an electrode chip or the like mounted on the mounting portion, wherein the rotary holder is rotated at a predetermined rotation. The electrode tip mounted on each of the mounting portions can be positioned at a fixed welding position by rotating and fixing the mounting portion at an angle.

That is, in this case, the holder case is omitted by directly holding the rotary holder with a horn instead of supporting the rotary holder with the holder case. The procedure for handling this electrode holder is the same as that described above for holding it in the holder case. However, when applied to the lower electrode holder, for example, the height of the electrode tip As the electrode tip becomes lower, it becomes easier to perform various tasks, and it becomes difficult to bend even when a high load is applied during welding.Also, even when the electrode tip has a deformed shape such as a bent tip, interference when rotating the rotary holder is prevented. Can be reduced. '

Further, another electrode holder for resistance welding according to the present invention is a cooling mechanism for an electrode holder according to claim 1. The electrode holder is cooled toward a mounting portion of the rotary holder via the holder case or directly through a rotary holder. A cooling water circulation path for discharging water to the outside after supplying water is provided, and the cooling water path of the rotary holder has a parallel structure for simultaneously supplying cooling water to a plurality of mounting portions. It is.

As described above, if a cooling water circulation path for supplying and discharging cooling water through a holder case or directly through a rotary holder is provided as a cooling mechanism, not only the electrode chip but also the electrode holder and the like are effectively provided. Cooling can be performed, and troubles such as cooling hoses interfering with peripheral devices and hindering welding work can be prevented.

In addition, if the cooling water passage of the rotary holder has a parallel structure in which cooling water is simultaneously sent to a plurality of mounting parts, the cooling water passage can be simplified, Therefore, the operation of manufacturing the cooling water channel can be simplified.

Further, another multi-electrode holder for resistance welding according to the present invention, as a cooling mechanism for an electrode holder according to claim 2, after supplying cooling water to a mounting portion of a rotary holder via the horn. A cooling water circulation path for draining water to the outside is provided, and the cooling water path of the rotary holder has a serial structure in which cooling water is sent to a specific one mounting portion.

By providing a cooling water circuit that supplies and discharges cooling water via a horn as a cooling mechanism, the cooling hoses interfere with peripheral equipment and hinder welding work. If the cooling water passage of the rotating holder is configured in series to send cooling water toward one specific mounting part, cooling water can be sent to multiple mounting parts at the same time. Compared with the parallel structure, the supply of cooling water to the electrode tip in use becomes more reliable, and the cooling effect can be enhanced.

Further, another multi-electrode holder for resistance welding according to the present invention is characterized in that an electrode tip is attached to a mounting portion of the rotary holder via an intermediate adapter.

If the electrode tip is attached via the intermediate adapter in this way, various types of electrode tips having irregular shapes can be attached to the attachment portion, and the applicable range of the present device can be expanded.

Further, another multi-electrode holder for resistance welding according to the present invention is characterized in that an O-ring is fitted on the inner surface of the chip mounting hole of the intermediate adapter. If the ring is fitted, even if the electrode tip is not in use, it will be prevented from falling out of the intermediate adapter 1 due to vibration, etc. Problems such as leakage of cooling water can be prevented.

Further, another multi-electrode holder for resistance welding according to the present invention is characterized in that at least one surface of the rotary holder and the holder case is subjected to plating. If the surface of the rotating holder or the holder case is treated in this way, foreign substances such as spatter rings are less likely to adhere and the conductivity can be increased.

Here, as the plating process, for example, nickel plating is suitable. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an overall schematic diagram of a resistance welding machine to which an electrode holder according to a first embodiment of the present invention is attached.

FIG. 2 is an enlarged front view of a lower electrode holder portion of the first embodiment. FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a state diagram before the intermediate adapter and the electrode tip are mounted on the electrode holder of the first embodiment.

FIG. 5 is a configuration example view of the retaining member of the rotary holder according to the first embodiment as viewed from the rear.

FIG. 6 is an enlarged front view of a lower electrode holder part of a second embodiment according to the present invention.

FIG. 7 is an explanatory view showing a cooling mechanism inside the lower electrode holder of the second embodiment.

FIG. 8 is a sectional view taken along line BB of FIG.

FIG. 9 is an explanatory view showing a cooling mechanism inside the lower electrode holder of the third embodiment according to the present invention.

FIG. 10 is an exploded view of the lower electrode holder of the third embodiment.

FIG. 11 is a sectional view taken along the line C-C of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail with reference to the drawings.

INDUSTRIAL APPLICABILITY The multi-electrode holder according to the present invention is capable of performing a plurality of types of resistance welding such as spot welding, nut welding, and bolt welding with a single resistance welding machine. Easy installation and easy welding mode of conventional welding machine It can be changed.

First, the first embodiment of the multi-electrode holder for resistance welding according to the present invention will be described. A resistance welding machine 1 to which the multi-electrode holder for resistance welding of the first embodiment according to the present invention is applied is shown in FIG. As shown in FIG. 3, the upper electrode unit 2 and the lower electrode unit 3 are provided, and the upper electrode unit 2 is attached to the support member 5 which is vertically movable with respect to the upper arm 4. An upper horn 6 and an electrode holder 7 attached to the upper horn 6 are provided, and a drive source 8 for driving the support member 5 up and down is provided on the upper arm 4.

Further, the lower electrode unit 3 includes a lower horn 11 attached to the tip of the lower arm 10 and an electrode holder 12 attached to the lower horn 11. The electrode holder 7 of the upper electrode unit 2 also includes: The electrode holders 12 of the lower electrode unit 3 have substantially the same configuration.

A plurality of sets of electrode tips 13a, 13b, 14a, 14b, 15a, and 15b are attached to each of the electrode holders 7 and 12. After making the electrode tips 13a, 13b (or 14a, 14b, or 15a, 15b) face each other, as a member to be welded on the lower electrode tip 13b The upper electrode tip 13a is lowered by the drive source 8 and the upper and lower electrode tips 13a, 13b are sandwiched and pressurized to apply a welding current to perform resistance welding. I have.

'The details of the electrode holders 7 and 12 will be described using the lower electrode holder 12 as a representative example.

As shown in FIGS. 2 to 4, the electrode holder 12 has a T-shaped holder case 1 with a leg portion held by the lower horn 11 and a through hole 16 h formed in a horizontal portion. 6, a rotation holder 17 rotatably inserted into the through hole 16 h of the holder case 16, and a retaining member 18 fitted on the insertion end side of the rotation holder 17. A fixed port 19 is provided as fixing means for restricting the rotational position of the rotary holder 17. The large-diameter portion 17 a at the front end of the rotary holder 1 にはA plurality of mounting holes 20 as mounting portions are formed at equal intervals. An electrode tip 13b (or 14b, 15b) is mounted in the mounting hole 20 via an intermediate adapter 21. The holder case 16 and the rotary holder 17 A cooling water circulation path 22 that can circulate the cooling water toward each of the mounting holes 20 is formed in the inside of the housing.

In this embodiment, the cooling water circulation path 22 includes a water supply path 22 a inserted from the lower end of the leg of the holder case 16 toward the inner surface of the through hole 16 h, and a water supply path 22 a The communication path 2 2b of the rotary holder 17 that connects the water supply path 2 2c to the center of the rotary holder 17 and the water sent into the water supply path 2 2c is provided at three mounting holes 20. Three open passages 2 2 d for feeding into the blow-off pipe 23 such as a heat-resistant tube or a heat-resistant pipe, etc., which are arranged in the inside, and the electrode tips 1 3 b, 1 4 b, 15 Each return hole 2 2 e communicating with the inner bottom of the mounting hole 20 in which the cooling water blown toward 5 b is stored, and the outer surface of the rotary holder 17 communicating with the return path 2 2 e A circumferential groove 2 2 f formed along the circumferential direction of the holder case 16 and a drain for cooling water discharged from the lower end of the leg of the holder case 16. water It includes a waterway 2 2 g, the water supply passage 2 2 a water discharge channel 2 2 g is provided in the holder case 1 6, and the other cooling channel is provided on the rotary holder 1 7.

In this embodiment, the water supply passage 22a and the water discharge passage 22g extend from the lower end of the leg of the holder case 16. However, as in the second embodiment described later, the rotating holder It may be arranged to extend from the direction perpendicular to the paper surface of the cross-sectional view shown in FIG. 3 toward the water supply path 22 c and the return path 22 e of 17.

The three open passages 2 2 d connecting the water supply passages 2 2 c of the rotary holder 17 and the respective mounting holes 20 are formed with screw holes so that the blow-out pipes 23 can be attached. As shown in FIG. 2, it is formed so as to face all three mounting holes 20. For example, it is impossible to cool only the electrode tip 13b in use, and the other electrode tip 13b is not used. The electrode chips 14b and 15b have a parallel structure in which cooling water is circulated at the same time.

This is because if only one selected location is to be cooled, it will be necessary to provide a dedicated water supply channel 22c and return channel 22e, etc., resulting in a complicated structure. This is because the cooling water channel can be easily configured if the cooling water is fed in parallel.

Incidentally, for example, it is possible to mount only one electrode tip 13b in the mounting hole 20 and not to mount the other electrode tips 14b and 15b. Attach a plug or the like to the used mounting hole 20 to prevent water from leaking from the same part.

The fitting surface of the rotary holder 17 rotatably fitted to the holder case 16 is provided with concave grooves for fitting the seal ring 24 at a plurality of positions. At the front of the large-diameter portion 17a, three port holes s are provided on the front face as shown in FIG. 2 so that the fixed port 19 can be inserted therethrough and the holder A screw hole i (FIG. 3) is formed at a predetermined position of the case 16 so that the port shaft of the fixing bolt 19 can be screwed therein. Then, by rotating the rotary holder 17 by a predetermined angle and positioning the desired electrode tip 13 b (14 b, 15 b) at the welding position, one of the bolts 揷 through holes s is held by the holder. It matches with the screw hole i of the case 16, and the position can be fixed by inserting the fixing port 19 and screwing it. In addition, a concave portion d into which the head of the fixing bolt 19 can be inserted is formed at the entrance of the port 揷 through hole s.

As shown in FIG. 4, the mounting hole 20 is formed with a female screw portion 20 m into which the screw portion 21 n of the intermediate adapter 21 can be screwed. The material of the case 16 and the rotary holder 17 is arbitrary as long as conductivity can be obtained. For example, copper alloys such as copper, aluminum, and beryllium copper, and non-ferrous metals can be applied. In this embodiment, brass is used. The surface of the rotary holder 17 and the holder case 16 are subjected to nickel plating to increase the conductivity and prevent sputtering from adhering.

The intermediate adapter 21 has the screw portion 2 In on the outer peripheral surface as described above. On the other hand, a concave groove for fitting the seal ring 25 is provided below it, and a taper portion of the electrode tip 13b is fitted in the center of the intermediate adapter 121. A taper hole 21 t is provided. A groove is formed in the middle of the tapered hole 21t, and an O-ring 26 is provided inside the groove.

The lower electrode unit 3 is vibrated when applying pressure to the workpiece with the upper electrode during welding. This prevents the electrode tip from falling down and prevents cooling water from leaking from the mating surface of the electrode tip.

The retaining member 18 is attached to the end of the rotating holder 17 that rotatably penetrates the through hole 16 h of the holder case 16 and serves as a retaining member. As shown in FIG. 5, the rotary holder 17 has a fitting hole 18 k fitted into the shaft portion, a slot m, and a port hole 18 b for tightening the port.

Then, after the fitting hole 18 k is fitted to the through shaft of the rotary holder 17, a port (not shown) is inserted into the port hole 18 b and tightened. Like that.

In the lower horn 11, a pair of divided bodies 11a and lib having semi-cylindrical recesses are made freely connectable by a port, so that the legs of the T-shaped holder case 16 can be sandwiched and held. ing.

The electrode holder 7 of the upper electrode unit 2 has almost the same configuration, and each electrode tip 13 a (14 a, 15 a) is replaced with the electrode tip 13 b (14 b, 14 b) of the lower electrode unit 3. 15 b) The type that fits to b) is used. The operation and the like of the electrode holder 12 described above will be described.

First, an appropriate lower electrode tip 13 b (14 b, 15 b) is moved to the welding location according to the type of welding. That is, with the fixed port 19 removed, the rotary holder 17 is turned by hand, the desired electrode tip 13 b is moved to the welding position, and then the fixed port 19 is inserted into the predetermined port through hole. Insert into hexagon wrench, etc. Fix with. In addition, the electrode tips 13a, 14a, and 15a on the upper side are appropriately combined and positioned.

Incidentally, in the example of the lower electrode tip 13b, 14b, 15b shown in FIG. 2, the electrode tip 13b is for spot welding, the electrode tip 14b is for nut welding, and the electrode tip 15b is port welding. It is for.

Next, the work is placed and positioned on the electrode tip 13b, and the drive source 8 is operated to lower the upper electrode tip 13a and pressurize the work from above. Then, the upper and lower horns 6, 11 directions Current is applied to each of the electrode tips 13a and 13b from above to perform welding.

Cooling water is fed into the cooling water circulation path 22 including the time of welding to cool the electrode tips 13b and 13a and the electrode holders 7 and 12, but this cooling water is in use. The other electrode chips 14b, 14a, 15b, and 15a are also sent and circulated.

When changing the type of welding in the manner described above, remove the fixed port 19, turn the rotary holder 17 by hand, and place the desired electrode tip 14b (15b) at the welding position. Then, insert the fixing port 19 into the predetermined port 揷 through hole s and fix it with a hexagon wrench or the like. In accordance with this, the upper electrode tip 14a (15a) is also changed and welding is started.

According to the above-described procedure, a single resistance welding machine 1 can perform welding in a plurality of types of welding modes, which is convenient.

Also, even if sputtering occurs during welding, the surfaces of the rotating holder 17 and the holder case 16 are nickel-plated, so that spattering rings are less likely to adhere, and durability can be improved. The conductivity can be increased.

Also, when the upper electrode tip 13a presses the workpiece, even if the lower electrode unit 3 vibrates, the lower electrode tip 14b, 151) is tapered by the action of the ring 26. There is no problem such as falling out of t and falling, and problems such as water leakage are also suppressed.

By the way, in the first embodiment described above, the cooling water channels of the cooling structure have a parallel structure. In particular, when the electrode tip 13 b in use is in the upward position and the other electrode tips 14 b and 15 b are in the obliquely downward position, as in the case of the lower electrode holder 12, gravity Therefore, there is a problem in that the amount of cooling water supplied to the used electrode tip 13b is smaller than that of the electrode tips 14b and 15b which are not in use, and the cooling effect cannot be enhanced. Therefore, the multi-electrode holder for resistance welding according to the second embodiment of the present invention has a cooling water channel formed in a series structure by improving such a disadvantage. Hereinafter, the multi-electrode holder for resistance welding according to the second embodiment will be described. The holder will be described with reference to FIGS. 6 to 8.

In this embodiment, the cooling water passages are arranged in series, and the cooling water is supplied and drained from the side of the holder case 16. Other than that, the multi-electrode holder for resistance welding of the first embodiment is almost the same. is there.

That is, as shown in FIGS. 6 to 8, the cooling water circulation path 22 is configured to supply and drain water from the side of the holder case 16, and the water supply path 22 a is provided on one side of the holder case 16. Are formed, and in the rotary holder 17, three communication passages 22 and three independent water passages 22 c communicating with each communication passage 22 b are arranged at equal intervals in the circumferential direction. Each of the water supply channels 22c communicates with three mounting holes 20 via an open channel 22d. Further, each of the return paths 22 e communicates with the inner bottom of the mounting hole 20 in which the cooling water blown out from the discharge pipe 23 is stored, and these two return paths 22 e As in the case of the first embodiment, the rotary holder 17 communicates with a circumferential groove 22 f formed in the outer surface of the rotary holder 17 along the circumferential direction. The circumferential groove 22 f communicates with a water drainage passage 22 g formed on one side surface of the holder case 16. In the side of the holder case 16, the water supply fitting 22 X and the drain fitting 22 y are located at the inlet of the water supply passage 22 a and the outlet of the water drainage passage 22 g in the front-rear direction. Are provided side by side.

When the desired electrode tip 13 b is positioned at the welding position by rotating the rotary holder 17, as shown in FIG. 8, a communication passage communicating with the mounting hole 20 of the electrode tip 13 b is formed. 22 b communicates with the water supply channel 22 a, and cooling water sent from the water supply channel 22 a passes through a specific water channel 22 c It is blown out from the outlet pipe 23 of one electrode tip 13b, circulates in the return path 22e, and is discharged from the water drainage path 22g.

In this case, the cooling water is sent only to the electrode tip 13 b at the welding position, and is not sent to the electrode tips 14 b and 15 b at the other two places. Only the electrode tip 13 b can be effectively cooled.

Next, a third embodiment of the multi-electrode holder for resistance welding according to the present invention will be described with reference to FIGS. 9 to 11. FIG.

In this embodiment, the holder case 16 used in the above example is omitted, and the rotary holder 17 is directly mounted on the front surface of the horn 10 (1 1). When applied to 12, the position of the electrode tip 13b (14b, 15b) is lowered, so that various operations can be performed easily.Also, the rigidity is increased and the electrode bends even if a high load is applied during welding. At the same time, even if the electrode tip 13b (14b, 15b) has a deformed shape such as a bent tip, there is an effect that it becomes difficult to interfere with the surroundings when rotating the rotary holder 17. is there.

The cooling water circulation path 22 guides the cooling water sent from the rear surface of the lower horn 11 into the cooling water path in the rotary holder 17, and the electrode tip 13 b (14) in one specific mounting hole 20. After cooling b, 15 b), the cooled cooling water is drained from the rear surface of the lower horn 11, and the cooling water passage in the rotary holder 17 is the same as that of the second embodiment. The structure is almost the same as the holder 17.

For this reason, the lower horn 11 has a water supply passage 22a for supplying cooling water through the water supply connection 22X, and drains the cooled cooling water through the drainage connection 22y. A water drainage channel 22 g is formed, and the water supply channel 22 a can send the cooling water fed from the center on the rear side of the lower horn 11 to the outer side surface of the rotary holder 17. The water drainage passage 22 g is also configured as a single bent passage so that the cooled cooling water drained from the outer peripheral surface portion of the rotary holder 17 can also be drained from the center on the rear side of the lower horn 11. It is configured as a single bent road. And the extension of the water supply channel 22a is: The water drainage passage 22 g can be freely communicated with the circumferential groove 22 f of the rotation holder 17 by freely communicating with a specific communication passage 22 b of the rotation holder 17. In this embodiment, the water supply connector 22X and the drainage connector 22Y are provided in a single connector 30. The connector 30 is provided on the rear surface of the lower horn 11. The distal end is opened and the proximal end is closed, and at the same time, a drainage connector 2 2 y is connected to the side surface of the connector 30, which can be freely inserted into the tapered connection hole 31. An outer cylinder 32, a water guide tube 33 mounted inside the outer tube 32 and connected to the water supply connector 2 2X, and connected to a distal end of the water guide tube 33 and forward of the outer tube 32 A water supply pipe 34 extends over the water, and the water supply pipe 34 communicates with the water supply passage 22 a in the lower horn 11, and the inside of the outer cylinder 32 is in the lower horn 11. It communicates with 22 g of water drainage channel.

In the front of the lower horn 11, a fitting hole 35 into which the rotary holder 17 can be rotatably inserted and a port shaft of the fixed port 19 can be screwed. A screw hole i is provided, and an in-opening flange 36 is provided on the outer peripheral edge of the front surface for fitting in the large-diameter portion 17a of the rotary holder 17 in and out.

The tapered connection hole 31 may be a screw connection hole or a straight connection hole. At this time, water tightness may be maintained by a sealing material or the like, water tightness may be maintained by brazing or soldering, or water tightness may be maintained by other means.

On the other hand, the large-diameter portion 17a of the rotary holder 17 is provided with a concave groove 3 8 for mounting an O-ring 37 (FIG. 9) along the outer periphery of a portion to be fitted to the inner flange 36. (FIG. 10) is formed, and the shaft portion of the rotary holder 17 near the large-diameter portion 17 a is provided with a resin member 40 j at the tip of the retaining member 40. The shape groove 41 is formed along the circumferential direction. The fitting surface of the rotary holder 17 is formed with a concave groove for fitting the seal ring 24 at a plurality of locations, as in the first and second embodiments.

A screw hole 42 for mounting the retaining member 40 is provided at a predetermined position corresponding to the round groove 41 on the peripheral side surface of the lower horn 11. In addition, an air discharge hole 43 for letting out the air in the fitting hole 35 is opened at a predetermined portion of a portion corresponding to the base end of the fitting hole 35. I have.

After the rotary holder 17 as described above is fitted into the fitting hole 35 of the lower horn 11, the retaining member 40 is screwed into the screw hole 42, and the outside thereof is covered with a blind screw. Is engaged with the R-shaped groove 41 to prevent it from coming off.However, when the shaft of the rotary holder 17 is fitted into the fitting hole 35, the action of the seal ring 24 The air inside 35 is sealed and there is no escape place. By discharging the air through the air discharge hole 43, the fitting is performed smoothly. When the fitting is completed, the air discharge hole 43 is closed by the blind lid.

Prior to this fitting, an O-ring 37 is attached to the concave groove 38 of the large-diameter portion 17a, thereby closing the fitting gap between the large-diameter portion 17a and the inlet-to-flange 36, and performing sputtering. This prevents the rotation holder 17 from being hindered from entering into the fitting gap.

The multi-electrode holder for resistance welding 12 of the third embodiment as described above makes it possible to perform various operations easily by reducing the height of the electrode tip 13b (14b, 15b). Even when a load is applied, it becomes difficult to bend, and even if the electrode tip 13 b (14 b, 15 b) has a deformed shape such as a bent tip, it does not easily interfere with the surroundings when the rotating holder 17 rotates. In the cooling water circuit 22, only one specific electrode tip 13b (14b, 15b) can be cooled, effectively cooling the electrode tip 13b (14b, 15b) in use. can do.

In the third embodiment described above, the water supply / drainage connector 30 can be mounted on the rear surface of the lower horn 11, but may be mounted on the peripheral surface instead of the rear surface.

Note that the present invention is not limited to the above embodiments. Those having substantially the same configuration as those described in the claims of the present invention and exhibiting the same functions and effects belong to the technical scope of the present invention. For example, the specific types of the electrode tips 13b, 14b, and 15b are merely examples, and a multi-type electrode holder is attached to only one of the upper electrode unit 2 and the lower electrode unit 3. May be.

In addition, the rotation and positioning of welding mode switching may be automated using a well-known Serpomo unit or a cylinder unit, in which case the work setup, labor and labor are reduced. Personnel costs can be reduced, and tact time can be reduced. Industrial applicability

As described above, the multi-electrode holder for resistance welding of the present invention is provided with the holder case held by the horn at the lower or upper part of the resistance welder, and makes the rotary holder rotatable with respect to the holder case. At the same time, a plurality of mounting parts are formed on this rotary holder, and the rotary holder is rotated and fixed at a fixed position, so that the electrode tips attached to each mounting part can be positioned at a certain welding position. Multiple types of resistance welding can be performed with a single resistance welding machine, and the size and weight of the device can be reduced.

It is preferable to provide a cooling water circulation path in the holder case and the rotary holder as a cooling mechanism for the electrode holder and the electrode tip.

In addition, if the rotary holder is directly attached to the horn, the height of the electrode tip will be reduced, making it easier to perform various tasks, making it difficult to bend even when a heavy load is applied. However, it is less likely to interfere with surroundings.

In addition, since the electrode tip can be attached to the attachment portion of the rotary holder via the intermediate adapter, an electrode tip having a different shape can be attached, and the applicable range can be expanded.

Also, since the O-ring is fitted on the inner surface of the chip mounting hole of the intermediate adapter, even if the electrode tip is not in use, it will fall out of the middle adapter by vibrating, etc. Problems such as cooling water leaking from the fitting part of the electrode chip can be prevented. Since the surface of the rotary holder and the holder case are plated, foreign substances such as sputtering hardly adhere to the surface and the conductivity can be improved.

Claims

The scope of the claims

1. A multi-electrode holder for resistance welding in which a single resistance welding machine can perform a plurality of types of resistance welding, a holder case held by a horn at a lower portion or an upper portion of the resistance welding machine, and the holder case. A rotation holder rotatably supported with respect to the rotation holder; a plurality of mounting portions formed on the rotation holder; fixing means capable of fixing the rotation holder at a fixed rotation position; A cooling mechanism for cooling the electrode tip and the like to be mounted, and by rotating the rotary holder at a predetermined rotation angle and fixing the electrode holder, the electrode tip attached to each of the mounting portions can be positioned at a fixed welding position. A multi-electrode holder for resistance welding characterized by the following.

2. A multi-electrode holder for resistance welding, which is capable of performing a plurality of types of resistance welding with one resistance welding machine, wherein the rotary holder is rotatably held by a horn at a lower or upper part of the resistance welding machine; A plurality of mounting portions formed on the rotary holder; fixing means capable of fixing the rotary holder at a fixed rotation position; and a cooling mechanism for cooling an electrode chip or the like mounted on the mounting portion. A special type of resistance welding is characterized in that the rotary holder is rotated at a predetermined rotation angle and fixed, so that the electrode tips attached to the respective mounting portions can be positioned at predetermined welding locations. Electrode holder.

3. The cooling mechanism is provided with a cooling water circulation path for supplying cooling water to the mounting portion of the rotary holder through the holder case or directly through the rotary holder and then discharging the cooling water to the outside. 2. The multi-electrode holder for resistance welding according to claim 1, wherein the cooling water passage of the rotary holder has a parallel structure in which cooling water is simultaneously sent to a plurality of mounting portions.

4. The cooling mechanism is provided with a cooling water circulation passage for supplying cooling water to the mounting portion of the rotary holder via the horn, and then discharging the cooling water to the outside. 3. The multi-electrode holder for resistance welding according to claim 2, wherein the holder has a series structure in which cooling water is sent to one specific mounting portion.

5. The electrode tip according to any one of claims 1 to 4, wherein an electrode tip is attached to a mounting portion of the rotary holder via an intermediate adapter. Multi electrode holder for resistance welding.

6. The resistance welding according to any one of claims 1 to 5, wherein a ring is fitted on an inner surface of the tip mounting hole of the intermediate adapter. For various electrode holders.

7. A surface treatment is applied to at least one of the rotary holder and the holder case, wherein the surface is subjected to plating. The multi-electrode holder for resistance welding according to any one of claims 6 to 9.