Eccentric-wheel-based variable-curvature bending method for metal pipe

Abstract

The invention discloses an eccentric-wheel-based variable-curvature bending method for a metal pipe. The metal pipe is connected to a fixed bending die, an eccentric wheel free bending die is arrangedon the metal pipe, and the metal pipe performs feeding movement in the axis direction of the fixed bending die. In the bending and forming processes of the metal pipe, the position of the fixed bending die is unchanged, the eccentric wheel free bending die performs rotation around the rotation center of the eccentric wheel free bending die at a constant angular speed and the rotation center of the eccentric wheel free bending die moves along a fixed movement track. Any complex metal pipe bending and forming profile can be obtained through control over the movement track of the rotation centerof the eccentric wheel free bending die and adjustment of the rotation movement of the eccentric wheel free bending die around the rotation center of the eccentric wheel free bending die, real-time change of the bending radius is realized when the same metal pipe is bent and formed, and the forming efficiency of bending and forming of the metal pipe is effectively improved.

Description

technical field [0001] The invention relates to the technical field of bending and forming of thin-walled metal pipe fittings, in particular to a method for bending metal pipe fittings with variable curvature based on an eccentric wheel. Background technique [0002] The tube structure has the characteristics of high strength, high rigidity, material saving, beautiful appearance, etc., and also has good forming and processing performance. Therefore, the hollow structure mainly composed of various metal tubes is widely used in aerospace, nuclear power, automobile, etc. , ships, petrochemical, construction and transportation and other fields. [0003] At present, due to the requirements of design performance, economic technology, installation space and light weight, the design shape and spatial configuration of metal curved pipe fittings are becoming more and more complicated, and the axis form of metal curved pipe fittings has gradually evolved from a planar form to a spatial...

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Problems solved by technology

[0003] At present, due to the requirements of design performance, economic technology, installation space and light weight, the design shape and spatial configuration of metal curved pipe fittings are becoming more and more complicated, and the axis form of metal curved pipe fittings has gradually evolved from a planar form to a spatial form. The number of bending radii on metal bending pipe fittings is also gradually increasing, which poses a huge challenge to traditional metal pipe bending forming technology and equipment

Using traditional metal pipe bending methods such as stretch bending, press bending, push bending, winding, etc., when forming bent pipe fittings, the axis of the bent pipe is usually in a simple form, and one mold can only be bent into one bending radius, so for different The bending radius needs to be equipped with multiple molds, and according to the different bending radii, the above bending methods need to constantly replace the bending molds. This defect leads to the limitation of the number of bending radii that can be bent and formed by the same metal pipe in the traditional metal pipe bending method.

At the same time, forming methods such as press bending and push bending usually require long-term repeated mold repair processes for different bending radii of the same curved pipe, which greatly reduces the forming quality and forming efficiency of metal complex curved pipes

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