Stepping roll-in forming method and device for supramaximal deformation thin-wall pipe

Abstract

The invention discloses a stepping roll-in forming method and a device for a supramaximal deformation thin-wall pipe. The stepping roll-in forming method comprises pipe blank preforming and pipe blankshaping. The pipe blank preforming: rolling waves on the outer surface of a pipe blank to be processed in a stepping roll-in mode; and the pipe blank shaping: flattening the waves on the tube blank in the stepping roll-in mode. The pipe blank is processed in the stepping roll-in mode in the pipe blank preforming stage, so that not only the problem that the traditional roll-in forming is difficultis solved, but also the problem of transition thinning caused by the fact that materials at wave troughs cannot flow into the traditional rolling pipe blank when a plurality of waves are synchronously rolled is solved; and in the pipe blank shaping stage, the pipe blank is processed in the stepping roll-in mode, so that flow resistance of the materials in the deformation process is reduced, and the materials at each position of a shaped pipe wall is uniformly distributed.

Description

technical field [0001] The invention relates to the technical field of forming thin-walled pipe fittings, in particular to a step-by-step roll forming method and device for ultra-large deformation thin-walled pipes. Background technique [0002] The traditional forming of thin-walled pipe fittings is generally processed by rolling or internal high pressure forming, but there are the following problems: [0003] 1. Because the material of thin-walled pipe fittings is a low-plastic material (such as SUS304), it is not easy to deform, and processing by rolling will cause rounded wrinkling of thin-walled pipe fittings. If the support is not supported, instability will also occur, and even cracks will occur due to local transitional thinning of the pipe during rolling; [0004] 2. When using internal high-pressure machining, although the problem that the material itself is not easy to deform is solved, the thin-walled pipe fittings will cause transitional thinning at a certain p...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a step-by-step roll forming method for ultra-large deformation thin-walled pipes. This method is intended to solve the problems of difficult forming of thin-walled pipes and uneven distribution of materials on the pipe wall. Further provide the Forming device required for the method

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