A composite flexible bending forming method for pipes

Abstract

The invention discloses a pipe composite flexible bending forming method. The method comprises the following steps of segmenting a three-dimensional geometric model of a bent pipe with a complex shape, including a straight section, a large bending radius section and a small bending radius section; carrying out bending radius evaluation on segments, dividing a bending radius of a pipe into a smallbending radius and a large bending radius, wherein a transition position of the two bending radiuses is a joint point of different bending parameters; establishing a quantitative relation between geometrical shape parameters of the straight section, the large bending radius section and the small bending radius section and a pipe axial feeding speed v, movement time t, an eccentric distance U and abending die movement speed u; establishing a three-dimensional bending model by adopting a finite element method, and optimally analyzing a relationship among the process parameters through a plurality of simulation results; taking the optimized quantitative relation as a bending process parameter, and making three-dimensional free bending and detour be accurately compounded; and transmitting thefinal technological parameters and the joint point of the two bending modes to equipment, and executing actual bending forming.

Description

technical field [0001] The invention belongs to the technical field of advanced manufacturing of metal complex components, in particular to a composite flexible bending forming method of pipes. Background technique [0002] Metal components of various complex and curved shapes are widely used in many fields such as aerospace, nuclear power, automobiles, ships, petrochemicals, construction and other civil industries, and play an important role in reducing the production cost and weight of products. [0003] At present, the traditional metal component bending technologies mainly include press bending, stretch bending, winding bending, push bending and bending processes derived from the above basic processes. The above traditional pipe forming methods cannot meet the high-precision requirements of pipes when bending pipes with complex axis shapes. At the same time, according to the difference of the relative bending radius, the above-mentioned pipe bending method must also con...

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Problems solved by technology

[0005] The existing composite flexible bending forming system for pipes does not have a relatively mature method for optimizing the bending forming process of metal complex components

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