Multi-deformed bending forming method and device for pipe fitting

Abstract

The invention discloses a multi-deformed bending forming method for a pipe fitting. The method comprises the following steps: 1) placing a tube blank into an inner cavity of a hydraulic bulging die, 2) filling up a cylinder at an external part of the hydraulic bulging die with liquid, and mounting a punch with a through hole and an overflow valve on the cylinder, 3) driving movement of a piston of the cylinder to extrude the liquid in the cylinder so as to obtain high-pressure liquid, and injecting the high-pressure liquid into the tube blank through the punch, so that the tube blank obtains a hydraulic pressure required for bulging, 4) starting applying an axial force to the end part of the tube blank by the punch when the piston contacts the punch arranged inside the cylinder, and 5) controlling the axial force by controlling a travel of the piston, and controlling the size of the hydraulic pressure for forming the tube blank by adjusting an overflow value of the overflow valve so as to gradually increase a forming pressure of a forming apparatus, so that a transition fillet of the tube blank gradually gets close to the hydraulic bulging die, and achieves the required shape. The invention also discloses a multi-deformed bending forming device of the pipe fitting. The procedure and the die are simplified and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of pipe fitting processing, in particular to a multi-shaped bending forming method and device for pipe fittings. Background technique [0002] In the prior art, pipe fittings are formed by welding stamped sheet parts. [0003] In the process of pipe fittings processing, some pipe fittings have more complicated forming process, such as pipe fittings with multiple special-shaped bends, which require multiple processes to complete. [0004] In order to reduce the number of processes and molds, reduce the cost of manufacturers and mold manufacturers, and save resources, it is often considered to complete as much molding content as possible in the same process. [0005] Therefore, how to provide a multi-shaped bending forming method for pipe fittings, so as to realize simplification of procedures and molds and cost reduction, has become an important technical problem to be solved urgently by those skilled in the...

AI Technical Summary

Problems solved by technology

[0003] In the process of pipe fittings processing, some pipe fittings have more complex forming process, such as pipe fittings with multiple special-shaped bends, which require multiple processes to complete

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