Necking-in

Necking-in has its seeds in spinning technology. Leifeld has pioneered in systematically advancing and perfecting necking-in with a swinging rest. Preforms for necking-in are heated to warm-working temperature using induction equipment outside the necking-in machine. An automatic charging device feeds the heated preform to the work spindle and clamps it with a jaw chuck. The working roller on the swinging rest works the ends of the rotating workpiece to a gastight cylinder bottom or a bottleneck. During warm working, temperature losses in the deformation zone are compensated by a torch.