| 摘要 |
<p>A motor-driven pressure resistance welder (100) comprises upper and lower electrodes (15a, 18a) which sandwich an object (17) to be welded therebetween, first and second movement mechanisms (108, 110) which cause the movement of the upper electrode (15a) in the axis direction, a non-piezoelectric load sensor (21) and a piezoelectric load sensor (31), which detect loads inputted to the object (17) to be welded, and a control unit (56). The first movement mechanism (108) is provided with a ball screw (11) which is rotary-driven by a servo motor (5), and the second movement mechanism (110) to which a piezoelectric element stack (123) is provided is engaged with the ball screw (11). The control unit (56) calculates a detection pressurized load (P) on the basis of a detection value (P1) of the non-piezoelectric load sensor (21) and a detection value (P2) of the piezoelectric load sensor (31), and controls the operation of the servo motor (5) and the piezoelectric element stack (123) so that the detection pressurized load (P) becomes a set welding load (Pb).</p> |
