| 摘要 |
PURPOSE: An equalizing spot welding method using a large spot welding gun is provided to prevent the generation of a defective welding since the spot welding gun does not push a base material and rises even if the base material is not settled at the regular position. CONSTITUTION: An equalizing spot welding method using a large spot welding gun comprises: a step of inputting the angle data of the spot welding gun(30) from a robot controller(60) in real time to a system controlling board(70, PLC); a step of outputting the pneumatic pressure of an equalizing air cylinder(50) on the basis of the angle information, which is inputted to the system controlling board(70), and information, which is detected by the system controlling board(70), of spot welding gun(30); a step of contacting the base material(80) with the lower tip(20) which is raised by the equalizing air cylinder(50); a step of operating an upper tip(10) by a welding gun cylinder(40) in order to pressurize the base material(80), and spot-welding the base material(80) by applying an electric current between the upper tip(10) and the lower tip(20); a step of moving the upper tip(10) by the welding gun cylinder(40) to an original position and returning the lower tip(20) by the equalizing air cylinder(50) so that an electrode opens; and a step of moving the spot welding gun(30) to the next welding point with a gap opening between the upper tip(10) and the lower tip(20). In the step of outputting the pneumatic pressure, the equalizing air cylinder(50) sets the pneumatic pressure for stopping the rise of the lower tip(20) when the lower tip(20) is in contact with the base material(80). [Reference numerals] (A1) Inputting a control pressure value for an equalizing cylinder on a touch screen; (A2) According to welding gun type, angle(field test values); (BB) Detecting a welding gun number by a system control panel(PLC control panel); (CC) Transmitting robot angle data from a robot control panel to a system control panel; (D1) Completing movement of a robot to a welding position; (D2) Outputting a welding signal(welding condition); (EE) Outputting an equalizing control condition(according to welding gun type, angle); (FF) Raising the equalizing cylinder(according to welding gun type, angle); (GG,KK) Comparing data(the current value compared to an ordered value); (HH) Stopping raising the equalizing cylinder(keeping balance with the weight of a panel); (I1) Spot welding; (I2) Lowering an upper tip-Pressing the panel; (I3) Applying a welding current; (J1) Completing spot welding(raising the upper tip); (J2) Lowering the equalizing cylinder(outputting a control pressure); (LL) Lowering the equalizing cylinder; (MM) Moving the robot(the next welding position); (NN) Stopping equipment due to an error
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