Spot welding system and method of controlling pressing force...

Details Spot welding system and method of controlling pressing force... Spot welding system and method of controlling pressing force...

2006-02-21

2006-02-21

Shaw, Clifford C. (Department: 1725)

Electric heating

Metal heating

For bonding with pressure

C219S086320

Reexamination Certificate

active

07002095

ABSTRACT:
A spot welding system using a spot welding gun having a servomotor for driving welding tips capable of suppressing variation of pressing force due to influence of heat generated by welding current to obtain an uniform pressing force. A difference between the temperature T detected by a temperature sensor and an initial temperature T0is multiplied by a coefficient A to obtain a pressing force compensation amount α. A pressing force d estimated by an observer is subtracted from the compensated command pressing force p′ and an obtained difference is multiplied by a constant K2to obtain a torque command (current command) τ for driving the servomotor to press the objects by the welding tips. Since the commanded pressing force is compensated in accordance with the temperature, a constant and stable pressing force is produced without influence of the temperature variation.

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EP Search Report for corresponding EP Application No. 03 25 6355 mailed Oct. 1, 2004.
Notice of Grounds of Rejection for corresponding Japanese Application No. 2002-298423 mailed Aug. 3, 2004.

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