Bending forming process and tool for square pipe

Abstract

The invention belongs to the field of machine manufacturing, and particularly relates to a bending forming process and tool for a square pipe. The bending forming process comprises the following steps of (1) designing and manufacturing the tool: designing and manufacturing the dedicated tool according to the requirement of the bending size of the square pipe, wherein the tool comprises a substrate (1), a plurality of circle forming baffles (2) and a plurality of ejecting and pushing devices (3). The substrate (1) is used as the reference datum plane. The circle forming baffles (2) are fixed on the same surface of the substrate (1). The extension connecting lines of the baffles (2) coincide with the inner circle of a workpiece. The ejecting and pushing devices (3) is arranged along the excircle of the workpiece to provide needed external force for bending of the square pipe; (2) prebending the workpiece; (3) fixing the workpiece; (4) conducting hot straightening on the workpiece; and (5) removing the margin: removing the margin of the square pipe, forming a ring body after a joint is welded, and polishing a welding seam to be smooth. Through implementation of the bending forming process, indexes such as the roundness, the planeness and the appearance quality of the ring body after the square pipe is formed through bending can be effectively improved, the processing residual stress is removed, the structural strength of a product is improved, and compared with a conventional square pipe bending forming technology, the cost is low, the precision is high, and the process and the tool are suitable for popularization.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing, and in particular relates to a square tube bending and circle forming process and tooling. Background technique [0002] Square tube bends are widely used in the machinery manufacturing industry. The supporting structural part of the wind turbine is the fixed steel frame of the shroud. Its main structure is a 40mm×40mm square tube with a curved circle. The diameter of the ring body reaches 3m after forming. [0003] In the prior art, a pipe bender is usually used to bend the square pipe into a circle, and after the joint is welded, the ring body is formed. The disadvantage is that the surface of the square tube will inevitably be scratched after being rounded, and the inside of the arc will inevitably wrinkle, which will affect the mechanical properties and appearance quality of the product; because the elastic rebound of this kind of square tube is inevitable, after the externa...

AI Technical Summary

Problems solved by technology

The disadvantage is that the surface of the square tube will inevitably be scratched after being rounded, and the inside of the arc will inevitably wrinkle, which will affect the mechanical properties and appearance quality of the product; because the elastic rebound of this kind of square tube is inevitable, after the external force is applied to the joint welding, The roundness and flatness of the ring body cannot meet the accuracy requirements

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