Forming method for thin-wall multi-way composite pipe fitting

Abstract

The invention relates to the technical field of pipeline manufacturing, in particular to a forming method for a thin-wall multi-way composite pipe fitting, which comprises the following steps: S1, designing the outline shape and size of a plate blank to obtain a curve outline double-layer plate blank; s2, the double-layer plate blank is curled into a double-layer open type barrel blank with a non-closed cross section; s3, the double-layer open type barrel blank is subjected to liquid filling and pre-forming, primary compounding of the inner layer surface and the outer layer surface of a non-lap-joint area is achieved, and a double-layer prefabricated barrel blank is obtained; s4, excess materials of the double-layer open type barrel blank are removed along a straight line, welding is conducted, and a double-layer prefabricated pipe blank with the closed section is obtained; and S5, internal pressure shaping is conducted, secondary compounding of the surfaces of the inner layer and the outer layer is completed, and the final thin-wall multi-way composite pipe fitting is obtained. By means of the method, the purpose of manufacturing the thin-wall multi-way composite pipe fitting which is large in diameter-thickness ratio, uniform in wall thickness distribution, large in branch pipe height and high in forming precision can be achieved.

Description

technical field [0001] The invention relates to the technical field of pipe manufacturing, in particular to a forming method for thin-walled multi-pass composite pipe fittings. Background technique [0002] The composite pipe is a pipe formed by combining two or more layers of materials inside and outside through deformation and connection. Compared with single-layer pipes, composite pipe fittings can maximize the characteristics of each material on the premise of reducing the use of precious metals, save materials and costs, and also have higher bearing capacity and corrosion resistance, and many others. Excellent performance, with comprehensive characteristics that cannot be achieved by single-layer pipes. [0003] Multi-pass pipe fittings are important components in the pipeline system, used to change the direction of fluid flow, and are widely used in aerospace, shipbuilding, petroleum, chemical and various machinery industries. Multi-way pipe is divided into T-type th...

AI Technical Summary

Problems solved by technology

However, at high temperature, the coefficient of friction between the pipe and the mold increases, and the hardening index decreases, resulting in poor deformation uniformity. At the same time, there are problems such as microstructure performance control and surface quality. In addition, the requirements for pressure control and sealing in high temperature environments are very high. Extremely harsh, increasing manufacturing costs

Under ultra-low temperature conditions, the plasticity of materials such as aluminum alloy and pure copper is significantly improved, but the plasticity improvement of materials such as titanium alloys is extremely limited, and the increase in material strength will lead to an increase in forming pressure, which requires more forming equipment and molds. high

At the same time, the elastic modulus of the material is significantly improved under ultra-low temperature conditions, and the springback increases, which affects the forming accuracy of the pipe fittings

[0006] To sum up, with the development of current technology, higher demands are placed on multi-pass composite pipe fittings, and the existing forming technology has been difficult to form thin-walled multi-pass pipes with large diameter-thickness ratio, uniform wall thickness distribution, large branch height, and high forming precision. Therefore, there is an urgent need for a forming method for thin-walled multi-pass composite pipes to solve the problem.

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