| 摘要 |
A method of adjusting a clamping force for automatically correcting a reference clamping force(Fi) vs. electric reference supply current(Ii) table for a servo-controlled welding gun on which a workpiece is clamped. The clamping force vs. electric current table is generated based on servo motor and welding gun design specifications, and stored in memory. A proportional coefficient(k) between the supply currents(Ii) and the clamping forces(Fi) is calculated from this table. Each reference supply current(Ii) in the table is actually supplied to the servo motor to measure an actual clamping force(fi). The actual clamping force(fi) is compared with the corresponding reference clamping force(Fi) for each reference supply current(Ii) in the table. If the absolute value of a difference between the actual and reference clamping forces(|Fi-fi|) is outside a predetermined allowance, the reference supply current(Ii) is corrected by adding to the reference supply current(Ii) an amount obtained by multiplying a difference (Fi-fi) by the proportional coefficient(k), namely (k*(Fi-fi)). The actual clamping force(fi) is measured again with the corrected reference supply current. This operation is repeated until the absolute value of the difference falls within the allowance, at which time the value of the reference supply current in the table is corrected.
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