Abstract: An apparatus for sequentially effected performance of stamping and milling, welding and/or bonding operations on large area parts, e.g. fenders for motor vehicles, includes a holder for the plastic parts is stationary, as well as an underneath tool and an upper tool which are provided with tools so arranged, formed and movably mounted relative to the holder that the stamping and milling, welding and/or bonding operations can be performed one after the other and without altering the position of the plastic parts.

Abstract: An apparatus for sequentially effected performance of stamping and milling, welding and/or bonding operations on large area parts, e.g. fenders for motor vehicles, is described. In accordance with the invention a holder for the plastics parts is stationary. Moreover an underneath tool (16) and an upper tool (17) are provided, which are provided with tools (19, 22 and 24, 25 respectively) so arranged, formed and movably mounted relative to the holder that the stamping and milling, welding and/or bonding operations can be performed one after the other and without altering the position of the plastics parts (FIG. 4).

Abstract: A method and an apparatus for ultrasonic processing of workpieces (6) with a vibratory structure (1) comprising a sonotrode (3) and a converter (2). Energy is fed to the converter (2) by means of an ultrasonic generator (7), which is switched on and off by electrical switch-on and switch-off signals respectively, only for the duration of processing cycles. According to the invention the switch-off signals are generated on the basis of at least one state parameter (P) of the generator (7).

Abstract: A method and an apparatus for ultrasonic processing of workpieces (6) with a vibratory structure (1) comprising a sonotrode (3) and a converter (2). Energy is fed to the converter (2) by means of an ultrasonic generator (7), which is switched on and off by electrical switch-on and switch-off signals respectively, only for the duration of processing cycles. According to the invention the switch-off signals are generated on the basis of at least one state parameter (P) of the generator (7). (FIG. 1).