Hydraulic bulging pipe end sealing device

Abstract

The invention relates to a hydraulic bulging pipe end sealing device, comprising a pressure head and a columned sealing slider arranged in the pressure head, one end of the sealing slider contacts the pipe ends, the part of the sealing slider contacting the pipe ends is a convex ring curve. The hydraulic bulging pipe end sealing device can reduce an axial force for sealing the pipe ends, increase the bulging volume of the pipe blanks and reducing the thickness of the walls; the ends of the pipe blanks are processed to form an inner bevel and are repeatedly used for hydraulically bulging at two times.

Description

technical field [0001] The invention relates to a hydraulic bulging pipe end sealing device. Background technique [0002] In the hydraulic bulging of tubes, it is a necessary condition to ensure the reliable sealing of the tube end. The traditional tube end sealing methods include flat seal, ring-shaped sharp knife seal and cone-shaped insert seal. figure 1 It is a schematic diagram of a flat seal. The end plane of the punch directly bears against the ring end of the pipe, and both ends of the pipe are squeezed 2 to 3mm at the same time to make it sealed. It is suitable for medium bulging pressure and the pipe end is very flat. figure 2 It is a schematic diagram of ring-shaped sharp knife seal. The end face of the punch is processed into a 1.5mm high ring-shaped sharp knife, so that the sharp knife is inserted into the metal of the end surface of the pipe, and the sharp knife and the plane of the punch are jointly sealed. It is suitable for thick-walled pipes and places wi...

AI Technical Summary

Problems solved by technology

When the tube blank is hydraulically bulging, the above three sealing methods are selected, the axial thrust cannot effectively act on the large bulging area in the middle of the tube blank, and the wall thickness reduction in the middle of the tube blank is large, which is easy to swell

In addition, if the tube blank needs to be hydraulically bulged twice after the diameter is reduced, the end of the tube blank after the first hydraulic bulging needs to be processed again, otherwise it is difficult to ensure reliable sealing of the tube end

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