A kind of corrugated pipe processing technology

Abstract

The invention discloses a corrugated pipe processing technology, which comprises the following steps: S1, forming a short thick-walled pipe blank into a long thin-walled pipe by using a powerful spinning forming process; S2, forming the long thin-walled pipe obtained in step S1 Heat treatment eliminates work hardening, and the condition of heat treatment is complete annealing; S3, the long thin-walled tube obtained in step S2 is necked and formed by a necking spinning process. The beneficial effects of the present invention are: the present invention not only completely eliminates the longitudinal welds of the tunnel pipe parts, but also can greatly reduce the circumferential welds of the product, has higher forming precision, and is convenient for product assembly; greatly improves the pass rate and processing of products Efficiency reduces the production cost of the product; in the spinning process, the grain is refined, the product quality is good, and the service life is greatly improved.

Description

technical field [0001] The invention relates to the technical field of metal pipe processing, in particular to a bellows processing technology. Background technique [0002] The forming process of bellows includes hydroforming, roll forming and welding forming. Hydroforming is the most commonly used forming method for bellows. Using the liquid pressure in the tube blank, the tube blank is bulged in the confining ring until yielding occurs along the ring direction, and then the tube blank is compressed to the required length and small diameter. Bellows mostly use this method. The roll forming process is mainly used to process large corrugated pipes. It relies on the rolling forming of the forming wheel set in the tube blank. It can be formed by single wave rolling, and some devices can also form several corrugations at a time. The corrugated pipes formed by hydroforming and roll forming are all formed by expanding under internal pressure, and the deformation zone bears tens...

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Problems solved by technology

[0004] The traditional manufacturing method of "plate beading-rolling-welding" mainly has the following process disadvantages: (1) The welding area 2 is prone to stress concentration, which reduces the fatigue strength of the product, and the weld area may be produced during long-term storage. Microcracks and expand, affecting the service life of the product; (2) A large number of longitudinal welds, circumferential welds, especially cross welds, making it difficult to guarantee the welding quality of the tunnel pipe. According to the design requirements, the welds of the product The quality must be 100% inspected, and the efficiency of weld inspection is low and the cost is high; (3) Due to the limitations of the process itself, the length of each section is relatively short, currently it is mainly within 1100mm, which makes the number of sections of the tunnel pipe more, The processing technology is complicated and the production efficiency is low; (4) The product deformation is large during the welding process, and the product forming accuracy and consistency are poor

Using the above-mentioned equipment to process corrugated pipes with a pipe diameter greater than 250mm and a pipe wall thickness of 2.7-3.5mm, there are deformation defects due to the large pipe diameter and thin wall thickness during the forming process, and the processing of tunnel pipes cannot be completed.

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