| 摘要 |
PURPOSE:To control temp. with high accuracy and to produce a high quality product stably by containing all of the temp. changing factors for weld zones in press contacting forces, taking the deviation quantity thereof into one of compensation quantities and controlling the temp. CONSTITUTION:When the operation is started, the high frequency output voltage of an output transformer is detected with a high frequency voltage detector 11, and feedback quantity er is outputted to an adder 17. On the other hand, a speed signal Vr is fed to a speed operating part 14, and speed deviation quantity DELTAev is outputted to the adder 17. Simultaneously when a plate thickness signal tr is fed to a plate thickness operating part 15, a tracking signal TK for compensation is applied to the part 15, and plate thickness deviation quantity DELTAet is outputted to the adder 17. The press contacting force (p) of aqueeze rolls 1 is detected with a pressure detector 12, and is fed to a press contacting force operating part 16, from which press contacting force deviation quantity DELTAep is outputted to the adder 17. The adder 17 feeds the control deviation quantity DELTAe which is the result of addition to a controlling part 10. The part 10 outputs the control signal corresponding to this control deviation quantity DELTAe to a variable electric power source part 9 which controls the high frequency output voltage of a high freqency oscillating part 8. |
