JPH11309585A - Seam welding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the dressing of an electrode with the whole automatic driving and to obtain the finishing of the outer peripheral surface of the high quality roller electrode by dressing the outer peripheral surface of the roller electrode with a cutting tool, measuring the dressing amount and travelling the cutting tool in the parallel direction to the outer peripheral surface of the roller electrode. SOLUTION: A material to be welded is inserted between one pair of the roller electrodes of the upper roller electrode 1a and the lower roller electrode 1b and welded while rotating both roller electrodes 1a, 1b by supplying welding current. The outer peripheral surfaces of both roller electrodes 1a, 1b are dressed with the upper cutting tool 6a and the lower cutting tool 6b. Before and after starting the dressing, the position of the lower roller electrode 1b is measured with a lower electrode length measuring device 3 and a lower electrode length measuring contactor 4 to measure the dressing amount of the roller electrode. The upper cutting tool 6a and the lower cutting tool 6b are travelled in the parallel direction with an upper knurl-driving tool part 8a and a lower knurl-driving tool part 8b, an upper knurl-driving roller 7a and a lower knurl-driving roller 7b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seam welding apparatus provided with a device for automatically dressing the outer peripheral surface of a roller electrode.

[0002]

2. Description of the Related Art Conventionally, a seam welding apparatus inserts an object to be welded between a pair of an upper roller electrode and a lower roller electrode,
The welding current is applied while rotating both roller electrodes to weld the workpiece.However, as the number of welding of the workpiece increases, the outer peripheral surfaces of both roller electrodes are worn and irregularities are generated. Becomes unstable and adversely affects the welding result of the workpiece. Therefore, it is necessary to periodically dress (polish) the outer peripheral surfaces of both roller electrodes. Conventional dressing removes both roller electrodes from the seam welding device and dresses the outer peripheral surface manually with a special tool, or dresses both roller electrodes manually by approaching the special tool while attached to the seam welding device. One of the ways to do it was used.

[0003]

In the conventional method of dressing by hand, both roller electrodes are heavy and a tool having a cutting edge is used. And it takes a lot of man-hours when dressing. In addition, the dressing accuracy varies depending on the skill of the worker or the type of worker, and high accuracy cannot be obtained because of manual work.

Further, the outer circumscribing positions of the roller electrodes are the same before and after the dressing is started, that is, the amount of dressing is moved toward the center of the roller electrode so that the lower roller electrode and the workpiece come into contact with each other. Since the work of bringing the welding surface to the same position as before the start of the dressing is a manual operation, a considerable number of man-hours are required and high accuracy cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. The present invention automatically dresses the outer peripheral surface of a roller electrode, and the circumscribing positions of a pair of roller electrodes are determined before and after the dressing starts and ends. The present invention relates to a seam welding apparatus provided with a dressing device so as to automatically move a roller electrode so as to be the same.

[0006]

In order to solve this problem, a first means of the present invention comprises a pair of roller electrodes, a cutting tool for dressing an outer peripheral surface of the roller electrode, and a dressing for the roller electrode. A measuring means for measuring the amount and a traveling means for dressing the cutting tool by traveling in a direction parallel to the outer peripheral surface of the roller electrode.

A second means of the present invention comprises a pair of roller electrodes, a cutting tool for dressing the outer peripheral surface of the roller electrode, and a dressing tool for the roller electrode by running the cutting tool on the outer peripheral surface of the roller electrode. A detecting unit for detecting a start point, a measuring unit for measuring a dressing amount of the roller electrode, and a traveling unit for dressing by causing the cutting tool to travel in a direction parallel to an outer peripheral surface of the roller electrode. And

The third means of the present invention comprises a pair of roller electrodes, a cutting tool for dressing the outer peripheral surface of the roller electrode, and the cutting tool running in a direction perpendicular to the outer peripheral surface of the roller electrode. Detecting means for detecting the dressing start point of the roller electrode, measuring means for measuring the dressing amount of the roller electrode after detecting the dressing start point, and running the cutting tool in a direction parallel to the outer peripheral surface of the roller electrode. It is provided with a traveling means for dressing, and a roller electrode rotation driving means configured to circumscribe a knurl drive roller on the outer peripheral surface of the roller electrode and rotate the outer peripheral surface of the roller electrode at a constant cutting speed at a peripheral speed. Characterized seam welding equipment.

According to a fourth aspect of the present invention, in a seam welding apparatus having a pair of roller electrodes, a cutting tool for dressing an outer peripheral surface of the roller electrode and the cutting tool are attached to the outer peripheral surface of the roller electrode. Running in a perpendicular direction, detecting means for detecting the dressing start point of the roller electrode, measuring means for measuring the dressing amount of the roller electrode after detecting the dressing start point, and cutting the outer peripheral surface of the roller electrode A running means for dressing by running a cutting tool in a parallel direction, and rotation of a roller electrode in which a knurl drive roller is circumscribed on the outer peripheral surface of the roller electrode and the outer peripheral surface of the roller electrode is rotated at a constant peripheral speed. The drive means and the length measuring contact are applied to the outer peripheral surface of the roller electrode before and after dressing is started. Means for measuring the dressing result amount, and roller electrode moving means for moving the roller electrodes so that the mutual circumscribing positions of the pair of roller electrodes are the same before and after dressing start. It is provided.

According to a fifth aspect of the present invention, each of the first to fourth means is provided exclusively for a roller electrode corresponding to a pair of roller electrodes.

The sixth means of the present invention is a means for recognizing a worn state of the outer peripheral surface of the roller electrode from a position where a dressing start point of the pair of roller electrodes is detected, among the above first to fifth means. It is intended to be measured.

In a seventh aspect of the present invention, in any one of the first to sixth aspects, a knurl drive roller is circumscribed around the outer peripheral surface of the roller electrode, and the outer peripheral surface of the roller electrode is cut at a constant peripheral speed. And a roller electrode rotation drive means constituting the knurl drive roller so that a knurl groove can be added to the outer peripheral surface of the roller electrode after the dressing is completed.

[0013] An eighth means of the present invention is the above-mentioned roller electrode, wherein the circumscribed positions of the pair of roller electrodes are equal at the positions before and after dressing of the pair of roller electrodes. And a control means for controlling the restart of the seam welding device after the dressing is completed by displaying that the movement of the roller electrode has been completed and by turning on the movement completion signal of the roller electrode. It is a thing.

According to a ninth aspect of the present invention, there is provided a knurling drive roller for welding which rotates the roller electrode during welding among the first to eighth means, and the knurling drive for welding is provided during dressing. After separating the roller by the separating means separating from the roller electrode, a roller electrode that circumscribes a knurl drive roller to the outer peripheral surface of the roller electrode and rotates the outer peripheral surface of the roller electrode at a peripheral speed constant cutting speed. Rotation driving means.

According to a tenth aspect of the present invention, in any one of the first to ninth aspects, when the outer peripheral surface of the roller electrode is worn, the dressing is periodically performed according to the type of the workpiece and welding conditions. It is provided with control means for performing control so as to perform the processing automatically, and input means for enabling the number of cycles to be arbitrarily set.

According to an eleventh aspect of the present invention, there is provided the first to tenth aspects.
When the outer peripheral surface of the roller electrode is worn out of any of the means, the dressing is automatically performed periodically according to the type of the workpiece and welding conditions, and after the dressing is completed, the welding of the workpiece in the seam welding device is performed. Control means for controlling so that the operation can be automatically continued or all the operations in the seam welding apparatus can be selected by the input means, and input means capable of arbitrarily setting the number of cycles. is there.

According to a twelfth aspect of the present invention, the first to eleventh aspects are described.
A cutting tool for dressing the outer peripheral surface of the roller electrode of any of the means, and a detecting means for detecting the dressing start point of the roller electrode by running the cutting tool in a direction perpendicular to the outer peripheral surface of the roller electrode. When,
Measuring means for measuring the dressing amount while cutting the roller electrode after detecting the dressing start point, and a knurl drive roller circumscribing the outer peripheral surface of the roller electrode to rotate the outer peripheral surface of the roller electrode at a constant cutting speed at a peripheral speed And a roller electrode rotation driving means.

[0018]

According to the first means of the present invention, a pair of roller electrodes, a cutting tool for dressing the outer peripheral surface of the roller electrode, a measuring means for measuring a dressing amount of the roller electrode, Since the traveling means for dressing the cutting tool by traveling in a direction parallel to the outer peripheral surface of the roller electrode is provided, the amount of dressing can be controlled, and the roller electrode can be dressed with high accuracy.

According to the second means, a pair of roller electrodes, a cutting tool for dressing the outer peripheral surface of the roller electrode, and the cutting tool running on the outer peripheral surface of the roller electrode to start dressing the roller electrode. A detecting means for detecting a point, a measuring means for measuring an amount of dressing of the roller electrode, and a traveling means for dressing the cutting tool by traveling the cutting tool in a parallel direction with respect to an outer peripheral surface of the roller electrode, so that a dressing start point is provided. And the roller electrode can be more accurately dressed.

According to the third means of the present invention, in a seam welding apparatus having a pair of roller electrodes, a cutting tool for dressing the outer peripheral surface of the roller electrode, and the cutting tool is attached to the outer peripheral surface of the roller electrode. Running in a perpendicular direction, detecting means for detecting the dressing start point of the roller electrode, measuring means for measuring the dressing amount of the roller electrode after detecting the dressing start point, and cutting the outer peripheral surface of the roller electrode Running means for dressing by running a cutting tool in a parallel direction, and rotation of a roller electrode in which a knurl drive roller is circumscribed on the outer peripheral surface of the roller electrode and the outer peripheral surface of the roller electrode is rotated at a constant peripheral speed. With the driving means, the roller electrode drive can be performed even more accurately in a short time at high speed. Action that it is phishing is obtained.

According to the fourth means, in a seam welding apparatus having a pair of roller electrodes, a cutting tool for dressing the outer peripheral surface of the roller electrode, and the cutting tool in a direction perpendicular to the outer peripheral surface of the roller electrode. Running, detecting means for detecting the dressing start point of the roller electrode, measuring means for measuring the dressing amount of the roller electrode after detecting the dressing start point, and the cutting tool parallel to the outer peripheral surface of the roller electrode A traveling means for dressing by traveling in the direction, and a roller electrode rotation driving means for rotating a peripheral surface of the roller electrode at a constant cutting speed by circumscribing a knurl drive roller on an outer peripheral surface of the roller electrode. Before and after dressing start and after the end of the dressing on the outer peripheral surface of the roller electrode. Means for measuring the dressing result amount, and a roller electrode moving means for moving the roller electrode so that the mutual circumscribed position of the pair of roller electrodes is the same before and after the dressing start and end position It is possible to dress the roller electrode more accurately in a short time at high speed, and to automatically move the roller electrode so that the circumscribed positions of the roller electrodes are the same before and after the start of the dressing. Therefore, the effect is obtained that the contact position between the lower roller electrode and the workpiece is reliably reproduced at the same position in a short time.

According to the fifth means, in a seam welding apparatus having a pair of roller electrodes, the dressing operation of each of the pair of roller electrodes can be performed independently. The effect is obtained that the amount of dressing can be set and that one of the pair of roller electrodes can be dressed alone.

According to the sixth means, the amount of dressing on the outer peripheral surface of the roller electrode is measured by recognizing the wear state of the outer peripheral surface of the roller electrode from the position where the dressing start point of the pair of roller electrodes is detected. Since the measurement is performed, the dressing is performed while recognizing the current abrasion state of the outer peripheral surface of the roller electrode as compared with the method of performing a fixed amount of dressing, so that an effect that higher quality dressing can be obtained.

According to the seventh means, a knurl drive roller is circumscribed on the outer peripheral surface of the roller electrode to rotate the outer peripheral surface of the roller electrode at a constant cutting speed, and after the dressing is completed, the outer peripheral surface of the roller electrode is finished. Since the knurl drive roller is configured so that a knurl groove can be added to the knurled groove, an effect that a high quality welding result can be obtained when the workpiece is sandwiched between a pair of roller electrodes and welded. Can be

According to the eighth means, a roller electrode moving means for moving the roller electrode so that the mutual circumscribing positions of the pair of roller electrodes are the same before and after the start of the dressing, that is, by changing the amount of dressing. By displaying the completion of the movement of the roller electrode and turning on the movement completion signal of the roller electrode, the seam welding apparatus can be restarted after the dressing is completed. The use of the electrode has the effect of producing a high-quality welding result.

According to the ninth means, in a seam welding apparatus having a knurl drive roller for welding for rotating a roller electrode at a low welding speed during welding, the knurl drive roller for welding is used during dressing. After being separated by the separation means separating from the electrode, a knurl drive roller is circumscribed around the outer periphery of the roller electrode and the outer peripheral surface of the roller electrode is rotated at a constant cutting speed, so that the knurl drive is performed on the roller electrode side. An effect that high-speed dressing can be performed even when a roller is provided.

According to the tenth means, in the seam welding apparatus having the pair of roller electrodes, when the outer peripheral surface of the roller electrode is worn, the dressing is automatically performed periodically according to the type of the workpiece or the welding conditions. Control means that configures a control circuit to perform the operation in a controlled manner, and input means that allows the number of cycles to be set arbitrarily, so that dressing can be performed unmanned and periodically according to the type of workpiece or welding conditions. The effect that can be obtained is obtained.

According to the eleventh means, in a seam welding apparatus having a pair of roller electrodes, when the outer peripheral surface of the roller electrode is worn, dressing is automatically performed periodically according to the type of the workpiece and welding conditions. Control circuit configured to allow the input means to select whether to automatically continue the welding operation of the workpiece in the seam welding device after the dressing is completed or to terminate all the operations in the seam welding device by the input means. Since the means and the number of cycles can be arbitrarily set, an effect is obtained in which the finish of the outer peripheral surface of the roller electrode can be confirmed when the dressing is completed.

According to a twelfth means, in a seam welding apparatus having a pair of roller electrodes, a cutting tool for dressing the outer peripheral surface of the roller electrode, and the cutting tool is mounted in a direction perpendicular to the outer peripheral surface of the roller electrode. Running, detecting means for detecting the dressing start point of the roller electrode, measuring means for measuring the dressing amount while cutting the roller electrode after detecting the dressing start point, and cutting the outer peripheral surface of the roller electrode Running means for dressing by running a cutting tool in a parallel direction, and rotation of a roller electrode in which a knurl drive roller is circumscribed on the outer peripheral surface of the roller electrode and the outer peripheral surface of the roller electrode is rotated at a constant peripheral speed. High-speed, short-time, more accurate roller electrode dressing with driving means Action that can be obtained.

Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an overall configuration diagram of a seam welding apparatus.
Reference numeral a denotes an upper roller electrode, and 1b denotes a lower roller electrode. The workpiece is sandwiched between the pair of roller electrodes, and a welding current is applied while rotating both roller electrodes to weld the workpiece. . Reference numeral 2 denotes an upper roller electrode lifting cylinder which presses the workpiece from above. 6a is an upper cutting bit, and 6b is a lower cutting bit for dressing the outer peripheral surfaces of the upper roller electrode 1a and the lower roller electrode 1b, respectively. 7a is an upper knurl drive roller, and 7b is a lower knurl drive roller which circumscribes the outer peripheral surfaces of the upper roller electrode 1a and the lower roller electrode 1b, respectively. Is to rotate. 8
a is an upper knurl drive / bite portion, 8b is a lower knurl drive / bite portion, and is an upper cutting bit 6a and a lower cutting bit 6b.
And a mechanism for driving the upper knurl drive roller 7a and the lower knurl drive roller 7b. Numeral 9 is for attaching the upper cutting tool 6a, the lower cutting tool 6b, the upper knurl drive roller 7a, the lower knurl drive roller 7b, the upper knurl drive / bite section 8a, and the lower knurl drive / bite section 8b.

FIG. 2 is a front view of the lower dressing device in the overall configuration diagram of the seam welding device of FIG. 1 (the upper dressing device is omitted).
b is for moving the lower cutting tool 6b in a direction perpendicular to the outer peripheral surface of the lower roller electrode 1b, and the lower cutting tool left / right shift portion 11b moves the lower cutting tool 6b parallel to the outer peripheral surface of the lower roller electrode 1b. It is for running in the direction.

FIG. 3 is a side view of the lower dressing device shown in FIG. 2, and the lower knurl driving front-rear shift portion 12b is used to circumscribe the lower knurl driving roller 7b on the outer peripheral surface of the lower roller electrode 1b.

(Embodiment 2) In a second embodiment of the present invention, the lower electrode length measuring device 3 which is a part of the lower electrode length measuring device 3 before starting dressing the outer peripheral surface of the lower roller electrode 1b in FIG. Contact 4 rises and lower roller electrode 1b
Contact with the outer peripheral surface of the lower electrode 1b before the start of dressing.
Measure the length measurement dimension at the outer peripheral position of. Then, after the dressing of the outer peripheral surface of the lower roller electrode 1b, the lower electrode measuring contact 4 which is a part of the lower electrode length measuring device 3 similarly rises and contacts the outer peripheral surface of the lower roller electrode 1b. The dimension of the outer peripheral position of the lower electrode is measured. The dressing result amount is obtained by subtracting the length measurement result of the lower electrode outer peripheral position before the start of dressing from the length measurement result of the lower electrode outer peripheral position after the end of the dressing. The lower roller electrode 1b is moved by the lower electrode lifting / lowering unit 5 in FIG. 4 by the same amount as the dressing result amount.
By doing so, the circumscribed positions of the upper roller electrode 1a and the lower roller electrode 1b are the same before the dressing starts and after the dressing ends.

The operation of the first and second embodiments will be described with reference to the operation flowchart of FIG. In this operation flowchart, the roller electrode is abbreviated as an electrode, and the flowchart of the upper electrode dressing is omitted. And S
Is a step and the number at the end indicates the order. First, when the electrode dressing starts, the lower electrode measuring contact 4 and the upper electrode 1a of FIG. 1 rise (step 1), and before the dressing of the outer peripheral surface of the lower electrode 1b starts, the lower electrode measuring contact 4 is turned on. It contacts the outer peripheral surface of the lower electrode 1b (step 2). Then, the dimension of the outer peripheral position of the lower electrode 1b before the start of the dressing is measured, and the length measurement result is set to L1 (step 3).

When the length measurement is completed, the lower electrode length measurement contact 4 descends to the original position (step 4). Upper electrode 1 of FIG.
up and down knurling to a position that does not interfere with the lower electrode 1b
A tool mounting frame 9 is provided. The upper and lower knurl drive / tool mounting frame 9 is moved forward by an electrode dressing traveling device (not shown) during dressing.
a and approach the lower electrode 1b (step 5). Then, the lower cutting tool 6b is advanced toward the lower electrode 1b by the lower cutting tool front-rear shift portion 10b in FIG. 3 (step 6). Then, the lower knurl drive roller 7b circumscribes the lower electrode 1b by the lower knurl drive front-rear shift unit 12b in FIG. 3 (step 7).

On the other hand, in FIG. 6, the lower cutting tool 6b and the dressing start point detectors 24a, 24b mounted on the lower cutting tool front-rear shift portion 10b are connected to the lower electrode 1b as shown in FIGS. Approaching,
The outer peripheral surface of the lower electrode 1b, that is, the dressing start point is detected by the dressing start point detectors 24a and 24b (step 8). FIG. 6B shows the position where the dressing start point is detected. Further, as shown in FIG. 6C, when the lower cutting bit 6b moves forward and reaches the dressing amount measured by the dressing measuring means 17 in FIG. 3 (step 10), the lower cutting bit 6b stops moving forward. (Step 11). FIG. 6C shows this state. As an example of the dressing measuring means 17, positioning by a servomotor, or providing a slit hole on the circumference of an induction motor and a disk, counting the number of pulses by a photoelectric sensor and a counter unit, and when reaching a preset number of pulses The amount of dressing is determined by stopping the lower cutting tool 6b from moving forward. Also,
When the set time of the timer provided in the control device is counted, the advance of the lower cutting tool 6b is stopped to determine the dressing amount.

When the lower cutting tool 6b stops moving forward, the lower knurling drive roller 7b shown in FIG. 1 rotates, so that the lower electrode 1b, which has been circumscribed, also rotates at the cutting speed (step 12). The left / right shift portion 11b starts to traverse in a direction parallel to the outer peripheral surface of the lower electrode 1b, and the lower cutting bit 6 fixed to the lateral feed portion 11b.
b also starts to traverse (step 13). In this way, the lower electrode 1b is dressed by the lower cutting tool 6b as shown in FIG. 6D (step 14), and when the lower cutting tool 6b reaches the forward end as shown in FIG. Step 15), the lateral feed of the lower cutting tool 6b is stopped (Step 16). The dressed result amount becomes LO in FIG. 6 (e).

Even after the dressing is completed, the lower knurl driving roller 7b of FIG. 1 is kept in contact with the outer peripheral surface of the lower electrode 1b, and the lower electrode 1b is rotated to start processing the knurled groove on the outer peripheral surface of the lower electrode 1b. Yes (step 17)
At the same time, as shown in FIG. 3, the lower cutting tool 6b is retracted from the outer peripheral surface of the lower electrode 1b (step 18), and the lower cutting tool 6b stops the rotation of the lower electrode 1b at the retracted end (step 19). 3 lower knurl drive roller 7b
Is released from the outer peripheral surface of the lower electrode 1b (step 2).
0). This completes the knurling of the outer peripheral surface of the lower electrode 1b (step 21).

FIG. 7A is the same as that described in step 2 of the operation flowchart of FIG.
The circumscribed position of the upper electrode 1a and the lower electrode 1b before the start of the dressing is 25. FIGS. 7B to 7C are the same as steps 13 to 16 in the operation flowchart of FIG. After dressing toward the outer peripheral surface of the lower electrode 1b, the lower electrode length measuring contact 4 rises (step 22) and contacts the outer peripheral surface of the lower electrode 1b (step 23). Then, the dimension of the outer peripheral position of the lower electrode 1b after the dressing is completed is measured, and the length measurement result is set to L2 (step 24).

As shown in FIG. 7D, the dressing result amount L0 is obtained by subtracting the length measurement result L1 of the lower electrode outer peripheral position before the start of dressing from the length measurement result L2 of the lower electrode outer peripheral position after the end of the dressing. It is. That is, L0 is the lower electrode rising dimension. Lower electrode measuring contact 4
The lower electrode 1b is moved upward by the lower electrode lifting / lowering section 5 of FIG. 4 by the same amount as the dressing result amount while keeping the contact with the outer peripheral position of the lower electrode 1b (step 25).

The circumscribed position 25 of the upper electrode 1a and the lower electrode 1b in FIG. 7 is the same as the circumscribed position 25 in FIG. 7A before the start of the dressing and the circumscribed position 25 in FIG. 7D after the end of the dressing (FIG. 7D). As a result, the lower electrode 1b stops rising (step 27). When the lower electrode 1b stops rising, the lower electrode contact 4 is lowered (step 2).
8). Finally, the upper electrode 1a descends (step 2).
9) The electrode dressing ends.

At the same time as the knurling of the outer peripheral surface of the lower electrode in step 21 in FIG. 5 is completed, the electrode dressing device is retracted (step 30), and the lower cutting tool left / right shift portion 11b in FIG. Then, the lower cutting bit 6b is retracted (step 28).

As an example of controlling the lower electrode raising / lowering unit 5 in FIG. 4, positioning by a servomotor, or detecting the position of a current value in conjunction with an induction motor and a lower electrode contact 4 to read a data current value reader or the circumference of a disk. There is a method of providing a slit hole on the upper side, counting the number of pulses by a photoelectric sensor and a counter unit, and stopping the motor when the dressing result amount L0 stored in the control device becomes equal. As described above, in the conventional method, it took about half a day to perform the electrode dressing operation, which was a heavy labor. In addition, the quality of the dressing finished surface was unstable, and it was a dangerous work. However, the present invention enables the electrode dressing to be performed automatically in a short time of about 5 minutes, and the quality of the dressing finished surface is also stable. And the work is safe. By welding with the electrode that has been fully dressed, a high quality welded object can be provided.

(Embodiment 3) In a third embodiment of the present invention, the means necessary for dressing the lower electrode described with reference to FIGS. An electrode can be dressed by selecting an electrode dressing selection switch (not shown) for “upper-only to upper-lower to lower-only” to determine which electrode is to be dressed. Since the measuring means for dressing the upper electrode and the lower electrode is also dedicated, the amount of dressing for each electrode can be changed.

(Embodiment 4) In a fourth embodiment of the present invention, the wear state of the outer peripheral surface of the roller electrode of FIG. 8 is determined from the position where the starting point of the roller electrode is detected in FIG. The dressing is started after the wear state is recognized by the recognition unit 27, and the wear state of the outer peripheral surface of the roller electrode is always recognized even during the dressing (for example, a visual angle sensor).
The dressing is performed while recognizing the worn state by the control means 16 of FIG. Then, after recognizing that the condition of the outer peripheral surface of the roller electrode has been improved, the lower cutting tool 6 is stopped running, and the dressing is completed.

(Embodiment 5) In a fifth embodiment of the present invention, a knurl drive roller 7b is circumscribed on the outer peripheral surface of the lower roller electrode 1b in FIG. The knurl drive roller 7b is configured so that the knurl drive roller 7b can be rotated at the cutting speed described above and a knurl groove can be added to the outer peripheral surface of the lower roller electrode 1b after the dressing is completed. A knurl groove is previously formed on the outer peripheral surface of the knurl drive roller 7b by using a material having a hardness higher than that of the lower roller electrode 1b to add a knurl groove.
When the knurl driving roller 7b is rotated while pressing the knurl driving roller 7b against the outer peripheral surface of the lower roller electrode 1b, a knurl groove is added to the outer peripheral surface of the lower roller electrode 1b. In this manner, when the workpiece is sandwiched between the pair of roller electrodes having the knurled grooves after the dressing and welding is performed, a high-quality welding result can be obtained.

(Embodiment 6) According to a sixth embodiment of the present invention, as described with reference to FIG. 7, the circumscribing positions 25 of a pair of roller electrodes are the same at the beginning and the end of the dressing. Thus, welding is performed by sandwiching the work to be welded between the pair of roller electrodes, but an emergency stop or power failure occurs during the dressing, and the dressing may not be completed. In this way, if the dressing is not completed, or if welding is started with the mutual circumscribing positions 25 of the pair of roller electrodes not being the same before and after the start of the dressing, defective workpieces are produced. Will be lost. In order to prevent this, in FIG. 8, after dressing is completed, the circumscribing positions 25 of the pair of roller electrodes are determined.
Are equal at the end position before the dressing and at the end position, a roller electrode movement completion signal 19 and a roller electrode movement completion display means 20 for displaying a signal indicating that the roller electrode movement is completed and a roller electrode movement completion display means 20 are provided. By turning on, the seam welding apparatus can be restarted after the dressing is completed. If the roller electrode movement completion signal 19 is OFF, the start signal is not sent from the control means 16 to the seam welding device 23 in FIG.
No. 3 does not drive. Since the completion of the movement of the roller electrode is also displayed to the operator and others, the state of the roller electrode can be immediately determined.

(Embodiment 7) A seventh embodiment of the present invention relates to a seam welding apparatus having a knurl drive roller for welding for rotating a roller electrode at a low welding speed during welding. If the knurl drive roller for welding is kept in external contact with the roller electrode, it acts as a brake during dressing and the roller electrode does not rotate.

In order to solve this problem, in FIG. 8, at the time of dressing, the knurl drive roller 22 for welding is separated from the roller electrodes 1a, 1b of FIG.
Then, the knurl drive rollers 7a and 7b of FIG. 1 are circumscribed around the outer circumferences of the roller electrodes 1a and 1b, and the outer peripheral surfaces of the roller electrodes 1a and 1b are rotated at a constant peripheral speed. Thus, high-speed dressing can be performed even when a knurl drive roller for welding is provided on the roller electrode side.

(Embodiment 8) In the eighth embodiment of the present invention, the wear of the outer peripheral surface of the roller electrode changes depending on the type of the workpiece or the welding conditions. If the dressing cycle is the same regardless of the type of workpiece or the welding conditions, the welding result of the workpiece will be adversely affected, and if the dressing is performed with less wear, roller electrode wear will occur. Is faster and costs higher. In order to prevent this, the number of dressing cycles is input to the dressing cycle number input means 14 in FIG. 8 so that dressing can be performed periodically according to the type of the workpiece or the welding conditions. The dressing cycle number is received by the control means 16 and the dressing mechanism 18 is controlled to automatically perform the dressing. For example, when the number of dressing cycles of the workpiece A is set to 50 and the number of dressing cycles of the workpiece B is set to 100, the dressing is performed after the production of 50 pieces of the workpiece A and the production of 100 pieces of the workpiece B is completed. Dressing is performed later.

As described above, the dressing can be performed periodically according to the type of the workpiece or the welding conditions.

(Embodiment 9) A ninth embodiment of the present invention is directed to a case where a worker automatically presses a start switch only at the beginning when welding an object to be welded in a seam welding apparatus, and then performs continuous automatic operation. , After the dressing is periodically terminated according to the type of the workpiece or the welding conditions, and if it is desired to continuously and automatically operate after the dressing is completed,
After the dressing is completed, there is a case where it is desired to stop the operation of the seam welding apparatus and check the finished surface of the roller electrode. If only this can be done, versatility will be lost.

Therefore, before the continuous automatic operation of the seam welding apparatus, the welding operation of the workpiece in the seam welding apparatus is automatically continued after the dressing is completed in FIG. 8, or all the operations in the seam welding apparatus are ended. This is selected by the operation selection input means 15 and received by the control means 16 to control the seam welding apparatus 23.
Since the selection can be made in this way, unmanned operation can be performed and the efficiency is improved. Also, the finished surface of the roller electrode can be checked periodically.

(Embodiment 10) The tenth embodiment of the present invention is a case where the electrode dressing is performed in a shorter time than in the second embodiment. 6 (f) to 6 (i), the lower cutting tool 6C having a cutting edge wider than the width of the lower roller electrode 1b is attached to the lower cutting tool left-right shift portion in FIG. Move forward as shown in (f). Lower cutting tool 6
C advances and the dressing start point 24 shown in FIG.
When a and 24b detect the lower roller electrode 1b, the dressing starts, and the dressing amount measured by the dressing measuring means in FIG. 3 is dressed as shown in FIG. When the dressing is completed, the lower cutting bit 6C retreats as shown in FIG. 6 (i). L0 is the dressing amount. Thus, from (f) to (i) in FIG.
Can perform the electrode dressing in a shorter time than in the case of FIG. 6A to FIG. 6E.

[0056]

As described above, according to the present invention, the electrode dressing can be performed in a short time of about 5 minutes by the fully automatic operation, so that the efficiency is extremely high and the heavy labor and the dangerous work are released. In addition, despite the fact that experience and skill are not required for performing the electrode dressing, the quality of finishing of the outer peripheral surface of the roller electrode after the dressing is high and stable.

Since the roller electrode is automatically moved so that the circumscribing position of the roller electrode is the same before and after the dressing is started, the roller electrode can be securely welded to the roller electrode in a short time. The contact position of the object is reproduced. By welding the workpiece with the electrode thus dressed, a high-quality workpiece can be provided. In addition, since the dressing is performed periodically according to the type of the workpiece or the welding conditions, the quality control of the roller electrode can be scientifically performed.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a seam welding apparatus according to first to fifth embodiments of the present invention.

FIG. 2 is a front view of a lower dressing device of the seam welding device according to the first to fifth embodiments of the present invention.

FIG. 3 is a side view of a lower dressing device of the seam welding device according to the first to fifth embodiments of the present invention.

FIG. 4 is a side view of a lower electrode length measuring section of the seam welding apparatus according to the second to fifth embodiments of the present invention.

FIG. 5 is an operation flowchart of the seam welding apparatus according to the first and second embodiments of the present invention.

FIG. 6 is a diagram showing a dressing state according to the first, second, sixth, and tenth embodiments of the present invention.

FIG. 7 is a diagram showing a dressing length measurement state according to the second and tenth embodiments of the present invention.

FIG. 8 is a schematic configuration diagram of a seam welding apparatus according to fourth and sixth to tenth embodiments of the present invention.

[Explanation of symbols]

1a Upper roller electrode 1b Lower roller electrode 2 Upper roller electrode elevating cylinder 3 Lower electrode measuring device 4 Lower electrode measuring contact 5 Lower electrode elevating part 6a Upper cutting bit 6b Lower cutting bit 6c Lower cutting bit 7a Upper knurling drive roller 7b Lower knurl drive roller 8a Upper knurl drive / bite section, 8b Lower knurl drive bite section 9 Vertical knurl drive / bite mounting base 10b Lower cutting bit front / rear shift section 11b Lower cutting bit left / right shift section 12b Lower knurl drive front / rear shift section 13 Dressing start Point detection means 14 Input means of the number of dressing cycles 15 Input means for selecting operation 16 Control means 17 Dressing measurement means 18 Dressing mechanism 19 Roller electrode movement completion signal 20 Roller electrode movement completion display 21 Separation means 22 Knurl drive roller for welding 23 Seam welding device 24a, 24b Dressing start point detector 25 Boundary position of lower roller electrode and upper roller electrode 26 Length measurement origin of length measuring contact of lower roller electrode 27 Wear of outer peripheral surface of lower roller electrode State recognition means L0 Lower electrode elevation dimension = Dressing result amount L1 Length measurement dimension result of lower electrode outer peripheral position before dressing start L2 Length measurement dimension result of lower electrode outer peripheral position after dressing end

Claims (12)

[Claims] 1. A pair of roller electrodes, a cutting tool for dressing the outer peripheral surface of the roller electrode, measuring means for measuring a dressing amount of the roller electrode, and the cutting tool parallel to the outer peripheral surface of the roller electrode. A seam welding apparatus comprising running means for running and dressing in a direction. 2. A pair of roller electrodes, a cutting tool for dressing the outer peripheral surface of the roller electrode, and a detecting means for detecting the starting point of dressing of the roller electrode by running the cutting tool on the outer peripheral surface of the roller electrode. A seam welding apparatus comprising: measuring means for measuring a dressing amount of the roller electrode; and running means for dressing the cutting tool by running the cutting tool in a direction parallel to an outer peripheral surface of the roller electrode. 3. A pair of roller electrodes, a cutting tool for dressing the outer peripheral surface of the roller electrode, and the cutting tool running in a direction perpendicular to the outer peripheral surface of the roller electrode to set a dressing start point of the roller electrode. Detecting means for detecting, measuring means for measuring the dressing amount of the roller electrode after detecting a dressing start point, traveling means for dressing by running the cutting tool in a parallel direction to the outer peripheral surface of the roller electrode, A seam welding apparatus comprising: a roller electrode rotation driving unit configured to externally contact a knurl drive roller on an outer peripheral surface of a roller electrode to rotate the outer peripheral surface of the roller electrode at a constant cutting speed. 4. In a seam welding apparatus having a pair of roller electrodes, a cutting tool for dressing an outer peripheral surface of the roller electrode, and the cutting tool is caused to travel in a direction perpendicular to an outer peripheral surface of the roller electrode. Detecting means for detecting the dressing start point of the electrode, measuring means for measuring the dressing amount of the roller electrode after detecting the dressing start point, and dressing by running the cutting bit in a direction parallel to the outer peripheral surface of the roller electrode. Running means, a roller electrode rotation driving means for externally attaching a knurl drive roller to the outer peripheral surface of the roller electrode and rotating the outer peripheral surface of the roller electrode at a constant cutting speed, and an outer periphery of the roller electrode Before and after dressing the surface, the measuring contact was in contact with the surface to measure the dressing result. And a roller electrode moving means that moves the roller electrode so that the mutual circumscribed position of the pair of roller electrodes is the same before and after dressing starts. Seam welding equipment. 5. The seam welding apparatus according to claim 1, wherein each means is provided for each of the pair of roller electrodes. 6. A dressing amount is measured by means for recognizing a wear state of an outer peripheral surface of a roller electrode from a position where a dressing start point of a pair of roller electrodes is detected.
5. The seam welding apparatus according to any one of 5. 7. A knurl drive roller is circumscribed on the outer peripheral surface of the roller electrode to rotate the outer peripheral surface of the roller electrode at a constant cutting speed, and a knurl groove is added to the outer peripheral surface of the roller electrode after dressing is completed. And a roller electrode rotating drive means that constitutes the knurl drive roller so that the knurl drive roller can be driven.
7. The seam welding apparatus according to any one of 6. 8. A roller electrode moving means for moving the roller electrode so that the mutual circumscribed position of the pair of roller electrodes is the same before and after the dressing starts and at the end position, and that the movement of the roller electrode is completed. The seam welding apparatus according to any one of claims 1 to 7, further comprising control means for controlling the restart of the seam welding apparatus after the dressing is completed by displaying the signal and turning on the roller electrode movement completion signal. 9. A knurling drive roller for welding that rotatably drives a roller electrode at the time of welding, and the dressing knurling drive roller is separated from the roller electrode by dressing means after the knurling drive roller is separated from the roller electrode. The seam welding according to any one of claims 1 to 8, further comprising a roller electrode rotation driving unit configured to circumscribe a knurl drive roller on the outer peripheral surface and rotate the outer peripheral surface of the roller electrode at a constant peripheral speed. apparatus. 10. A control means for automatically and periodically performing dressing in accordance with the type of the workpiece and welding conditions when the outer peripheral surface of the roller electrode is worn, and the number of cycles can be arbitrarily set. The seam welding apparatus according to any one of claims 1 to 9, further comprising an input means. 11. When the outer peripheral surface of the roller electrode is worn, dressing is automatically performed periodically according to the type of the workpiece and welding conditions, and after the dressing, the welding operation of the workpiece by the seam welding apparatus is performed. 11. A control means for controlling selection of whether to automatically continue or to end all the operations in the seam welding apparatus by an input means, and an input means for arbitrarily setting a periodic rotation. The seam welding apparatus according to any one of the above. 12. A cutting tool for dressing an outer peripheral surface of a roller electrode, and a detecting means for causing the cutting tool to run in a direction perpendicular to the outer peripheral surface of the roller electrode to detect a dressing start point of the roller electrode. Measuring means for measuring the dressing amount while cutting the roller electrode after detecting the dressing start point, and a knurl drive roller circumscribing the outer peripheral surface of the roller electrode to rotate the outer peripheral surface of the roller electrode at a constant cutting speed at a peripheral speed 2. The apparatus according to claim 1, further comprising a roller electrode rotating drive means adapted to be driven.
12. The seam welding apparatus according to any one of claims 11 to 11.