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1. The forging approach can be used steel finalizing, and a part of the tubing is punched out, and thus reducing the outer size.

2. The going strategy can be used as steel digesting. sheet metal fabrication， We can place the key in the steel hose, as well as the outside may be pressed by rollers for round side processing.

3. The stamping technique can be used for stainless-steel digesting. The tapered central might be broadened for the desired size and shape in the punch.

4. The bulging strategy can be used for stainless-steel digesting: the first is to set rubberized inside the pipe, as well as the top rated is pushed using a punch to produce the pipe protrude one other strategy is hydraulic bulging generating, which is stuffed with water in the middle of the tube, and also the strain in the liquefied is Bulge the hose. In to the ideal shape, the production of bellows is generally found in this method

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