Multistage omega-shaped pipe forming method and device

Abstract

The invention relates to improvement of upsetting and expanding compound processes, and designs and provides an upsetting and expanding and compound hydro-forming technology aiming at the technical shortcomings that a multistage omega-shaped pipe is hard to feed and the wall thickness is reduced seriously, and discloses a multistage omega-shaped pipe forming method and device. According to the multistage omega-shaped pipe forming method and device, a continuous machining process of upsetting and expanding first and hydro-forming secondly on the multistage omega-shaped pipe is achieved. The process has the advantages of the upsetting and expanding compound technology and the hydro-forming technology, provides a method for forming of a reducer pipe which does not thin, achieves hydro-forming, can be used as a hydro-forming compound forming process of the multistage omega-shaped pipe, reduces the problem of reduction of the wall thickness effectively, and improves forming quality of the multistage omega-shaped pipe.

Description

technical field [0001] The technology belongs to the field of pipe forming, and in particular relates to a method for pipe upsetting forming and internal high-pressure compound forming. Background technique [0002] The internal high pressure forming technology is to force the plastic deformation of the tube and plate by passing high-pressure liquid or gas inside the tube blank or on one side of the slab, or by putting it into a rigid valve mold, and then feeding the material through the plug to make the workpiece. Stamping process. [0003] The multi-stage Ω tube targeted by the present invention has five convex hulls, such as figure 1 shown. Using internal high pressure direct forming, due to the effect of the steps between the convex hulls, it will seriously hinder the entry of materials, so that the three inner convex hulls cannot be fed. In production, measures to reduce friction such as coatings are used to increase them The effect of filling material is negligible,...

AI Technical Summary

Problems solved by technology

Using internal high pressure direct forming, due to the effect of the steps between the convex hulls, it will seriously hinder the entry of materials, so that the three inner convex hulls cannot be fed. In production, measures to reduce friction such as coatings are used to increase them The effect of filling material is negligible, and the wall thickness is seriously thinned, causing cracks. Moreover, the expansion rate of the convex hull inside the part is relatively large, far exceeding the expansion rate of the material in the case of natural swelling. Thick requirements to ensure the quality of finished products

[0004] For this part, there are disadvantages such as cumbersome operation and complicated process in application.

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