Method of controlling the force on a resistance welding terminal or the like; and resistance welding machine making use of this method

摘要

Method of controlling the force of a resistance welding terminal or machine which is equipped with a numerically controlled electric motor or the like. This method is characterised in that an inherent elasticity characteristic of the frame of the machine is established by allowing the motor M to exert two different forces F1, F2 on the workpieces and plotting its corresponding angles of rotation THETA 1, THETA 2, by means of which a clear relationship is established between each desired force F during a certain phase of the relevant process and the corresponding angle of rotation THETA which is to be performed by the motor M, as a result of which it is possible to vary the force during the phases "welding" and "holding after the welding". An elastic intermediate piece 14 can be inserted into the frame of the machine. Used on resistance welding machines with electrodes driven by electric motor. <IMAGE>