Swell-shrink drawing molding process and device for reducing pipes
A forming process and technology of reducing tubes, applied in the direction of wire drawing dies, mandrels, etc., can solve the problems of inability to realize different-diameter tube drawing and processing of different-diameter tubes
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[0037] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0038] A method for expanding and shrinking drawing and forming of different-diameter pipes, characterized in that: the process includes
[0039] The first step of necking: install the pipe on the frame, one end of the pipe is fixed by the push seat, the middle part is supported by the protective sleeve installed on the support seat, and then the other end of the pipe is necked by the neck push head ;
[0040] The second step of annealing: annealing the necked pipe through the annealing device;
[0041] The third step of drawing: drawing the pipe processed in the second step through the drawing chuck to form a different-diameter pipe blank;
[0042] The fourth step of annealing: annealing the blank of the reducing pipe through the annealing device;
[0043] The fifth step is to expand the tube, sizing and wall thickness drawing: through the drawing chuck, ...
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