JP3736193B2 - Resistance welding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resistance welding method in which one electrode is positioned and fixed, the other electrode is moved in the direction of one electrode, a plate to be welded is sandwiched between both electrodes, and current is supplied while pressing.
[0002]
[Prior art]
Conventionally, as a resistance welding, for example, a seam welding method is one in which an object is sandwiched between one roller electrode and the other roller electrode to supply current while pressing and rotating, and each time welding is performed, a pair of welding is performed. The outer peripheral surface of the roller electrode is worn and roughened.
[0003]
For this purpose, the outer peripheral surface of the roller electrode is periodically dressed with a cutting tool or the like. Since the diameter of the roller electrode is slightly smaller after dressing than before dressing, if the seam welding is performed without moving the position of the roller electrode, the welding result of the welded plate is adversely affected.
[0004]
Therefore, in order to position the outer peripheral surface of one roller electrode at the same position as before dressing, the screw or handle connected to one roller electrode is turned manually, and the roller electrode is positioned by visual check or gauge. It was.
[0005]
Also, the same positioning operation was performed when the roller electrode was replaced with a new one.
[Problems to be solved by the invention]
In resistance welding, the circumscribed position of a pair of electrodes (roller electrodes in seam welding) with respect to the plate to be welded is an important management item.
[0006]
As before, when the dressing of the electrode starts and after the end of dressing, or when the amount of wear becomes excessive or when the electrode that is no longer suitable for welding is replaced with a new electrode, the circumscribed positions of the pair of electrodes are the same. It needs to be in position.
[0007]
In other words, when moving one electrode in the welding position direction with respect to the dressed amount, man-hours are required to manually position one electrode on the welding surface where one electrode and the plate to be welded abut before starting dressing and after finishing dressing. Therefore, high positioning accuracy cannot be obtained because the positioning accuracy varies depending on the skill level of the worker and each worker.
[0008]
This problem becomes remarkable in seam welding using a roller electrode as an electrode.
[0009]
The present invention is for solving the above-mentioned conventional problems, and the pair of electrodes can be connected to each other before the dressing of the pair of electrodes is started and after the dressing is finished, or before and after the electrodes are replaced. The present invention relates to a resistance welding method in which welding is performed after a pair of electrodes are automatically positioned so that their circumscribed positions are the same.
[0010]
[Means for Solving the Problems]
In order to solve this problem, according to the present invention, the position of one electrode is positioned and fixed after being positioned at the welding execution position, the other electrode is moved in the direction of the one electrode, and both electrodes are In which the workpiece is sandwiched and welded, and when positioning the position of the one electrode at the welding execution position,
(1) The other electrode side end surface of the one electrode is on the other electrode side or on the opposite side from the welding positioning reference position set for positioning the one electrode at the welding execution position. A detection process for detecting such a detection state in real time;
(2) In the detection step, when it is detected that it is on the other electrode side, it is moved until it is located on the opposite side to the other electrode side,
(3) After moving to the side opposite to the other electrode side or when detected in the detection step as being on the side opposite to the other electrode, the first electrode moved to the other electrode side Moving process;
(4) in the first moving step, and a third transfer step in which the moves the predetermined distance set in advance from the welding positioning reference position, to position the position of said one electrode to the welding run position It is characterized by.
[0011]
According to the second aspect of the present invention, the position of one electrode is fixed after being positioned at the welding execution position, the other electrode is moved in the direction of the one electrode, and the workpiece is sandwiched and welded by both electrodes. In the method, when positioning the position of the one electrode at the welding execution position,
(1) The other electrode side end surface of the one electrode is on the other electrode side or on the opposite side from the welding positioning reference position set for positioning the one electrode at the welding execution position. A detection process for detecting such a detection state in real time;
(2) In the detection step, when it is detected that it is on the other electrode side, it is moved until it is located on the opposite side to the other electrode side,
(3) After moving to the side opposite to the other electrode side or when detected in the detection step as being on the side opposite to the other electrode, the first electrode moved to the other electrode side Moving process;
(4) In the first moving step, a stopping step of stopping the movement of the one electrode on the other electrode side from the welding positioning reference position ;
(5) After the stopping step, a second moving step of moving the one electrode in a direction opposite to the moving direction of the first moving step;
(6) The second moving step includes a third moving step of moving a predetermined distance set in advance from the welding positioning reference position and positioning the position of the one electrode at the welding execution position. Features.
[0012]
In the fourth aspect of the present invention, the predetermined distance to be moved from the time when the detection state is changed in the third movement step is changed according to the type of the workpiece when the workpiece is a welded plate. and the features in.
[0013]
The present invention according to claim 5 uses a cycle number input means so that the number of cycles can be arbitrarily set so that the operation of each process is performed periodically .
[0014]
The present invention described in claim 6 is characterized in that a positioning storage means for storing an electrode positioning completion signal even when the power is turned off is used after the operation of each step .
[0015]
The present invention according to claim 7 uses positioning display means for distinguishing and displaying that each step is in operation and that each operation in each step is completed and the positioning completion signal is ON. It is characterized by.
[0016]
The present invention according to claim 8 is characterized in that a start condition of the resistance welding apparatus is that the electrode positioning completion signal is ON .
[0017]
The present invention according to claim 9 is characterized in that an electrode exchange detecting means and an electrode exchange alarm means for exchanging electrodes are used .
[0019]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, the position of one electrode is positioned and fixed at the welding execution position, the other electrode is moved in the direction of the one electrode, and the workpiece is sandwiched between both electrodes. A method of welding, wherein when positioning the position of the one electrode at the welding execution position,
(1) The other electrode side end surface of the one electrode is on the other electrode side or on the opposite side from the welding positioning reference position set for positioning the one electrode at the welding execution position. A detection process for detecting such a detection state in real time;
(2) In the detection step, when it is detected that it is on the other electrode side, it is moved until it is located on the opposite side to the other electrode side,
(3) After moving to the side opposite to the other electrode side or when detected in the detection step as being on the side opposite to the other electrode, the first electrode moved to the other electrode side Moving process;
(4) The first moving step includes a third moving step of moving a predetermined distance set in advance from the welding positioning reference position and positioning the position of the one electrode at the welding execution position. Therefore, the electrodes can be automatically positioned at a high speed and in a short time with higher accuracy, and the circumscribed positions of the pair of electrodes can be set before and after the end of dressing, The effect that the circumscribed positions can be made the same before and after the replacement with a new electrode can be obtained.
[0020]
According to the second aspect of the present invention, the position of one electrode is fixed after being positioned at the welding execution position, the other electrode is moved in the direction of the one electrode, and the work piece is sandwiched between both electrodes. A method of welding, wherein when positioning the position of the one electrode at the welding execution position,
(1) The other electrode side end surface of the one electrode is on the other electrode side or on the opposite side from the welding positioning reference position set for positioning the one electrode at the welding execution position. A detection process for detecting such a detection state in real time;
(2) In the detection step, when it is detected that it is on the other electrode side, it is moved until it is located on the opposite side to the other electrode side,
(3) After moving to the side opposite to the other electrode side or when detected in the detection step as being on the side opposite to the other electrode, the first electrode moved to the other electrode side Moving process;
(4) In the first moving step, a stopping step of stopping the movement of the one electrode on the other electrode side from the welding positioning reference position ;
(5) After the stopping step, a second moving step of moving the one electrode in a direction opposite to the moving direction of the first moving step;
(6) Since the second movement step includes a third movement step of moving a predetermined distance from the welding positioning reference position and positioning the position of the one electrode at the welding execution position. The electrode can be automatically positioned at high speed and in a short time with higher accuracy, and the circumscribed position of the pair of electrodes is before the dressing is started and after the dressing is finished, or before the electrode is exchanged. Even after replacement with a new electrode, the circumscribed position can be made the same.
[0021]
According to the present invention of claim 4, it is possible to automatically position the circumscribed positions of the pair of electrodes in correspondence with the type of the plate to be welded at a high speed and in a short time with higher accuracy, The effect | action that the distance of the mutual circumstance position of a pair of electrode can be changed for every kind of to-be-welded board is acquired.
[0023]
According to the third aspect of the present invention, since the one electrode is moved to the predetermined initial position in the direction opposite to the other electrode before the first moving step, one of the electrodes is moved to the welding position. Since there is no need to determine whether the electrode moves away from or close to the welding position depending on whether the electrode is present, the control circuit is simplified, and the circumscribed position of the pair of electrodes can be made the same. can get.
[0024]
According to the fifth aspect of the present invention, the cycle number input means is used so that the number of cycles can be arbitrarily set so that the operation of each step is performed periodically. Therefore, the welding current, the welding speed, and the electrode pressure According to the welding conditions such as the above and the type of the plate to be welded, the circumscribed position of the pair of electrodes can be made the same.
[0025]
According to the sixth aspect of the present invention, since the positioning completion signal is stored even if the power is turned off after the positioning of the pair of electrodes is completed, it is necessary to perform the positioning operation of the pair of electrodes when the power is turned on again. There is no effect.
[0026]
According to the seventh aspect of the present invention, since the paired electrodes are in a positioning operation and the positioning is completed, the progress or state of the paired electrode positioning operation can be determined. The effect that it can be obtained.
[0027]
According to the eighth aspect of the present invention, since the starting condition of the resistance welding apparatus is that the positioning completion signal of the pair of electrodes is ON, damage prevention due to interference of the apparatus and poor welding of the welded plate are previously performed. The effect that it can be prevented in advance is obtained.
[0028]
According to the ninth aspect of the present invention, since the pair of electrode exchange detection means and the electrode exchange alarm means for exchanging the pair of electrodes are provided, the pair of electrodes is exchanged in advance before the pair of electrodes are worn too much. can do.
[0029]
(Embodiment 1)
Hereinafter, seam welding using a roller electrode will be described as an example with reference to the drawings for a first embodiment of the present invention.
[0030]
FIG. 1 is an overall configuration diagram of a seam welding apparatus, and one roller electrode will be described as a lower roller electrode 1b and the other roller electrode as an upper roller electrode 1a.
[0031]
Before welding the plate to be welded (not shown), the lower roller electrode 1b is positioned and fixed at the welding position, and the upper roller electrode 1a is moved in the direction of the lower roller electrode 1b so that it is between the two roller electrodes. The welding plate is welded by passing a welding current while rotating both roller electrodes while sandwiching the plate to be welded. The operation flowchart of FIG. 2, the positioning state diagram of the roller electrode of FIG. 4, and the workpiece of FIG. A description will be given with reference to a positioning distance setting diagram of roller electrodes for each type of weld plate.
[0032]
2 in the operation flowchart of FIG. 2 is a step, and the number at the end indicates the order.
[0033]
First, whether or not the lower roller electrode 1b in FIG. 1 is present at the welding position is detected by the welding position detection means 5 (step 1 in FIG. 2), and if detected, it is present at the welding position (FIG. 4). (A)), the lower roller electrode 1b starts to move downward by the lower roller electrode lifting motor 2 and the gear 4 (step 2).
[0034]
At the same time the lower roller electrode 1b starts to move away downward, whether the lower roller electrode 1b is present in welding position at the welding position detection means 5 detects in real Lee beam, the control device 7 the presence of the detection Feedback is provided (step 3).
[0035]
If the lower roller electrode 1b exists at the welding position, the lower roller electrode 1b continues to move downward as it is (repeating step 2 to step 3), and the lower roller electrode 1b is detected by the welding position detection means 5. If it is not performed, the lower roller electrode 1b stops moving downward (step 4), assuming that it is no longer present at the welding position ((b) of FIG. 4).
[0036]
Then, the lower roller electrode 1b starts to move upward in the welding position (step 5).
[0037]
If the lower roller electrode 1b is not present at the welding position in step 1 of FIG. 2 (FIG. 4B), the process jumps to step 5.
[0038]
At the same time the lower roller electrode 1b starts approaching moving upward, whether the lower roller electrode 1b is present in welding position at the welding position detection means 5 detects in real Lee beam, the control device 7 the presence of the detection Feedback is provided (step 6).
[0039]
If the lower roller electrode 1b is not present at the welding position, the lower roller electrode 1b continues to move upward as it is (repeating step 5 to step 6), and the lower roller electrode 1b is detected by the welding position detection means 5. Then, if it exists in the welding position ((c) of FIG. 4), the lower roller electrode 1b stops approaching upward (step 7).
[0040]
Next, the lower roller electrode 1b starts to move downward (step 8). The type of the plate to be welded is selected in advance by the type selection unit 8 of the plate to be welded, and the plate to be welded in FIG. In accordance with the positioning distance L of the roller electrode depending on the type, the lower roller electrode 1b is moved downward and positioned as described below.
[0041]
When, for example, the type W1 of the plate to be welded is selected in the positioning distance setting diagram of the roller electrode according to the type of the plate to be welded in FIG. Step 9 is repeated until the lower roller electrode 1b reaches the positioning distance L1 of the roller electrode. When the positioning distance L1 is reached, the positioning of the roller electrode for each type of the welded plate is completed (YES in Step 9), and the lower roller electrode 1b Stops moving downward (step 10), and the positioning of the roller electrode is completed ((de) in FIG. 4).
[0042]
When the positioning of the lower roller electrode 1b is completed, the upper roller electrode 1a is lowered by the upper roller electrode lifting cylinder 6.
[0043]
Now, it will be in the state which can be welded on both sides of a to-be-welded board.
[0044]
Examples of the welding position detection means 5 include a photoelectric sensor, a laser sensor, a proximity switch, a touch switch, a limit switch, or a method of detecting by forming a closed loop by applying a voltage to the roller electrode 1b. As an example of the motor 2, a servo motor, a pulse motor, an induction motor, or the like is used.
[0045]
Moreover, in the positioning distance setting diagram of the roller electrode according to the type of the plate to be welded in FIG. 6, for example, the setting value of the positioning distance L of the roller electrode can be input as zero. Further, as an inexpensive method, in the positioning distance setting diagram of the roller electrode according to the type of the welded plate shown in FIG. 6 without using the position confirmation encoder 3, for example, the lower roller is set with the set value of the positioning distance L of the roller electrode as a timer time. There is also a method of moving the electrode 1b for a certain time. Examples of the welding plate type selection means 8 include a digital switch, a combination of a 7-segment display and a switch, a rotary switch, a touch panel, and the like.
[0046]
Thus, since the welding surfaces of the upper and lower roller electrodes 1a and 1b (that is, the outer peripheral surfaces of the roller electrodes) are always positioned at the same position, a high-quality welded plate can be provided. Furthermore, since the upper and lower roller electrodes 1a and 1b can be positioned according to the type of the plate to be welded, other types can be handled.
[0047]
(Embodiment 2)
1 for the second embodiment of the present invention, an overall configuration diagram of the seam welding apparatus of FIG. 1, an operation flowchart of FIG. 3, a positioning state diagram of the roller electrode of FIG. 5, and a roller electrode classified by type of the plate to be welded of FIG. This will be described with reference to the positioning distance setting diagram.
[0048]
First, whether or not the lower roller electrode 1b in FIG. 1 is present at the welding position is detected by the welding position detecting means 5 (step 1 in FIG. 3), and if detected, it is present at the welding position (FIG. 5). (A)), the lower roller electrode 1b starts to move downward by the lower roller electrode lifting motor 2 and the gear 4 (step 2).
[0049]
At the same time the lower roller electrode 1b starts to move away downward, whether the lower roller electrode 1b is present in welding position at the welding position detection means 5 detects in real Lee beam, the control device 7 the presence of the detection Feedback is provided (step 3).
[0050]
If the lower roller electrode 1b exists at the welding position, the lower roller electrode 1b continues to move downward as it is (repeating step 2 to step 3), and the lower roller electrode 1b is detected by the welding position detection means 5. If it is not performed, the lower roller electrode 1b stops moving downward (step 4), assuming that it is no longer present at the welding position ((b) in FIG. 5).
[0051]
Then, the lower roller electrode 1b starts to move upward in the welding position (step 5).
[0052]
If the lower roller electrode 1b is not present at the welding position in step 1 of FIG. 3 (FIG. 5B), the process jumps to step 5.
[0053]
At the same time the lower roller electrode 1b starts approaching moving upward, whether the lower roller electrode 1b is present in welding position at the welding position detection means 5 detects in real Lee beam, the control device 7 the presence of the detection Feedback is provided (step 6).
[0054]
If the lower roller electrode 1b is not present at the welding position, the lower roller electrode 1b continues to move upward as it is (repeating step 5 to step 6), and the lower roller electrode 1b is detected by the welding position detection means 5. If it is present, the lower roller electrode 1b approaches and moves upward as described below according to the positioning distance L of the roller electrode according to the type of the welded plate in FIG. 6, assuming that it exists at the welding position (FIG. 5C). Position.
[0055]
When, for example, the type W1 of the plate to be welded is selected in the positioning distance setting diagram of the roller electrode according to the type of the plate to be welded in FIG. Step 7 is repeated until the lower roller electrode 1b reaches the positioning distance L1 of the roller electrode. When the positioning distance L1 is reached, the positioning of the roller electrode for each type of the plate to be welded is completed (YES in Step 7), and the lower roller electrode 1b Stops approaching in the upward direction (step 8), and the positioning of the roller electrode is completed ((d) in FIG. 5).
[0056]
When the positioning of the lower roller electrode 1b is completed, the upper roller electrode 1a is lowered by the upper roller electrode lifting cylinder 6.
[0057]
Now, it will be in the state which can be welded on both sides of a to-be-welded board.
[0058]
In the positioning distance setting diagram of the roller electrode by type of the welded plate in FIG. 6, for example, the setting value of the positioning distance L of the roller electrode can be input as zero.
[0059]
Further, as an inexpensive method, in the positioning distance setting diagram of the roller electrode according to the type of the welded plate shown in FIG. 6 without using the position confirmation encoder 3, for example, the lower roller is set with the set value of the positioning distance L of the roller electrode as a timer time. There is also a method of moving the electrode 1b for a certain time.
[0060]
Thus, since the welding surfaces of the upper and lower roller electrodes 1a and 1b (that is, the outer peripheral surfaces of the roller electrodes) are always positioned at the same position, a high-quality welded plate can be provided. Furthermore, since the upper and lower roller electrodes 1a and 1b can be positioned according to the type of the plate to be welded, other types can be handled.
[0061]
(Embodiment 3)
In the third embodiment of the present invention, regardless of whether or not the lower roller electrode 1b is initially present at the welding position in FIG. 1, the lower roller electrode 1b is moved downward with respect to the welding position as the first operation. Start moving away.
[0062]
When the lower roller electrode descending end detection means 9 is turned on by continuing the separation movement, the lower roller electrode 1b stops the separation movement.
[0063]
The subsequent operations are the same as steps 5 to 10 in the operation flowchart of FIG. 2 described in the first embodiment and steps 5 to 8 in the operation flowchart of FIG. 3 described in the second embodiment. Become. Since this description has been given in the first and second embodiments, it will be omitted.
[0064]
Examples of the lower roller electrode lower end detecting means 9 include a photoelectric sensor, a laser sensor, a proximity switch, a touch switch, a limit switch, or a method of detecting by forming a closed loop by applying a voltage to the roller electrode 1b.
[0065]
Since the lower roller electrode 1b is moved in the direction away from the welding position as described above, the step of determining whether the lower roller electrode 1b moves in the direction away from or closer to the welding position depending on whether the lower roller electrode 1b exists at the welding position. This eliminates the need for the control circuit.
[0066]
(Embodiment 4)
In the fourth embodiment of the present invention, the number-of-cycles input means 10 is set so that the positioning operation of the lower roller electrode 1b in FIG. 1 can be arbitrarily set for every welding of the plate to be welded or once every N times. The positioning operation of the lower roller electrode 1b in the operation flowcharts of FIGS. 2 and 3 is performed according to the number of cycles.
[0067]
Examples of the cycle number input means 10 include a preset counter and a touch panel.
[0068]
Thus, the positioning distance of the roller electrode can be kept constant depending on the welding conditions such as the welding current, the welding speed, the pressing force of the roller electrode, and the type of the plate to be welded.
[0069]
(Embodiment 5)
In the fifth embodiment of the present invention, when the positioning operation of the lower roller electrode 1b in FIG. 1 is finished as shown in the operation flowcharts of FIGS. 2 and 3, the positioning completion signal of the positioning of the lower roller electrode 1b is stored. 11 is stored.
[0070]
An example of the positioning storage means 11 is a power storage memory.
[0071]
Since the positioning completion signal (not shown) of the lower roller electrode 1b stored in the positioning storage means 11 is stored even when the power is turned off, the power supply at the time of power failure or start-up during the operation of the seam welding apparatus. It is not necessary to perform the positioning operation of the lower roller electrode 1b every time when is turned on.
[0072]
(Embodiment 6)
In the sixth embodiment of the present invention, when the positioning operation of the lower roller electrode 1b in FIG. 1 is operated as shown in the operation flowcharts of FIGS. 2 and 3, for example, when the lower roller electrode 1b is in the positioning operation, When the positioning display means 12 blinks and the positioning of the lower roller electrode 1b is completed, the blinking is changed to lighting and the distinction is displayed.
[0073]
Examples of the positioning display means 12 include a signal tower, a pilot lamp, and an LED display.
[0074]
In this way, it is possible to distinguish whether the lower roller electrode 1b is in positioning operation, or whether positioning is completed. Therefore, a danger warning is displayed during operation, and the display can be confirmed when the operation is completed. Can do.
[0075]
(Embodiment 7)
In the seventh embodiment of the present invention, when the positioning operation of the lower roller electrode 1b in FIG. 1 is operated as shown in the operation flowcharts of FIGS. 2 and 3, the positioning of the lower roller electrode 1b is completed and the lower roller electrode 1b is fixed.
[0076]
By fixing, the outer peripheral surface of the lower roller electrode 1b becomes a welding position, and the upper roller electrode 1a is lowered by the upper roller electrode lifting cylinder. By making the positioning completion signal (not shown) of the lower roller electrode 1b ON, the seam welding device starts automatic operation when an automatic start switch (not shown) is pressed. And it will be in the state which can be welded on both sides of a to-be-welded board.
[0077]
As a result, it is possible to prevent welding failure of the welded plate in advance, and the pair of roller electrodes can be appropriately positioned at the welding position, and high-quality welded plate can be welded.
[0078]
(Embodiment 8)
In the eighth embodiment of the present invention, the outer peripheral surface of the lower roller electrode 1b is worn while the welded plate is welded in FIG. As the diameter of the lower roller electrode 1b is gradually reduced, the welding of the welded plate is adversely affected.
[0079]
Whether or not the diameter of the lower roller electrode 1b is smaller than a certain value is determined when the positioning of the lower roller electrode 1b is completed. If the lower roller electrode replacement detection means 13 is OFF, the welding can be continued as it is. When the lower roller electrode replacement detection means 13 is ON, the roller electrode replacement alarm means 14 warns that it is time to replace the lower roller electrode 1b, and the roller electrode 1b is replaced with a new roller electrode.
[0080]
Examples of the lower roller electrode replacement detection means 13 include a photoelectric sensor, a laser sensor, a proximity switch, a touch switch, a limit switch, or a method of detecting by forming a closed loop by applying a voltage to the roller electrode 1b. Thus, the upper and lower roller electrodes 1a and 1b whose wear amount is excessively increased can be replaced in advance to prevent welding failure of the welded plates.
[0081]
【The invention's effect】
As described above, according to the present invention, the circumscribed position, that is, the welding position of the pair of electrodes, before the dressing is started and after the dressing is finished, before the electrode is exchanged and after the new electrode is exchanged, or to be welded. It is possible to automatically reproduce the positioning at the same position at high speed and in a short time automatically for each set number of welding of the plate, and the positioning distance of the welding position of the pair of electrodes corresponding to the type of the welded plate Since it can be changed, a welded plate welded with high quality can be provided.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a seam welding apparatus according to first to tenth embodiments of the present invention. FIG. 2 is an operation flowchart according to first, third to tenth embodiments of the present invention. FIG. 4 is a flowchart showing the operation of the roller electrode according to the first embodiment of the present invention. FIG. 5 is a view showing the positioning state of the roller electrode according to the first embodiment of the present invention. FIG. 6 is a positioning state diagram of electrodes. FIG. 6 is a positioning distance setting diagram of roller electrodes according to the type of welded plate in the first to fifth embodiments of the present invention.
DESCRIPTION OF SYMBOLS 1a Upper roller electrode 1b Lower roller electrode 2 Lower roller electrode raising / lowering motor 3 Position confirmation encoder 4 Gear 5 Welding position detection means 6 Upper roller electrode raising / lowering cylinder 7 Controller 8 Welded plate type selection means 9 Lower roller electrode lower end detection Means 10 Period number input means 11 Positioning storage means 12 Positioning display means 13 Lower roller electrode replacement detection means 14 Lower roller electrode replacement alarm means L Roller electrode positioning distance

Claims (9)

A method in which the position of one electrode is positioned and fixed at a welding execution position, the other electrode is moved in the direction of the one electrode, and an object to be welded is sandwiched and welded by both electrodes. When positioning the position at the welding execution position,
(1) The other electrode side end surface of the one electrode is on the other electrode side or on the opposite side from the welding positioning reference position set for positioning the one electrode at the welding execution position. A detection process for detecting such a detection state in real time;
(2) In the detection step, when it is detected that it is on the other electrode side, it is moved until it is located on the opposite side to the other electrode side,
(3) After moving to the side opposite to the other electrode side or when detected in the detection step as being on the side opposite to the other electrode, the first electrode moved to the other electrode side Moving process;
(4) A resistance having a third movement step in which, in the first movement step, a predetermined distance set in advance from the welding positioning reference position is moved, and the position of the one electrode is positioned at the welding execution position. Welding method. A method in which the position of one electrode is positioned and fixed at a welding execution position, the other electrode is moved in the direction of the one electrode, and an object to be welded is sandwiched and welded by both electrodes. When positioning the position at the welding execution position,
(1) The other electrode side end surface of the one electrode is on the other electrode side or on the opposite side from the welding positioning reference position set for positioning the one electrode at the welding execution position. A detection process for detecting such a detection state in real time;
(2) In the detection step, when it is detected that it is on the other electrode side, it is moved until it is located on the opposite side to the other electrode side,
(3) After moving to the side opposite to the other electrode side or when detected in the detection step as being on the side opposite to the other electrode, the first electrode moved to the other electrode side Moving process;
(4) In the first moving step, a stopping step of stopping the movement of the one electrode on the other electrode side from the welding positioning reference position ;
(5) After the stopping step, a second moving step of moving the one electrode in a direction opposite to the moving direction of the first moving step;
(6) A resistance having a third moving step of moving a predetermined distance from the welding positioning reference position and positioning the position of the one electrode at the welding execution position in the second moving step. Welding method.   The resistance welding method according to claim 1 or 2, further comprising an initial position moving step of moving one electrode to a predetermined initial position in a direction opposite to the other electrode before the first moving step.   The predetermined distance to be moved from the time when the detection state is changed in the third movement step is changed according to the type of the workpiece when the workpiece is a welded plate. The resistance welding method according to claim 1.   The resistance welding method according to any one of claims 1 to 4, wherein a cycle count input means is used so that the cycle count can be arbitrarily set so that the operation of each step is performed periodically.  The resistance welding method according to any one of claims 1 to 5, wherein a positioning storage means for storing an electrode positioning completion signal even when the power is turned off after the operation of each step is used.   7. A positioning display unit that distinguishes and displays that each process is in operation and that each operation in each process is completed and a positioning completion signal is ON. Resistance welding method.  The resistance welding method according to any one of claims 1 to 7, wherein an activation condition of the resistance welding apparatus is that an electrode positioning completion signal is ON.  The resistance welding method according to any one of claims 1 to 8, wherein an electrode exchange detection means and an electrode exchange alarm means for exchanging the electrodes are used.

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