Six-freedom-degree control blocking type flexible section bar three-dimensional stretch bending die and forming process

Abstract

The invention relates to a six-freedom-degree control blocking type flexible section bar three-dimensional stretch bending die and a forming process. The die forming curved surface consists of a group of forming curved surface modules, a die base, an adjustable support, lead screw and other parts. Each forming curved surface module is controllable and adjustable in six freedom degree. Therefore, the bending curvature and a twist angle of the die forming curved surface can be adjusted and controlled through a corresponding mechanism on the die, and accordingly the flexible control of the die forming curved surface is achieved. The curvature of the die forming curved surface in a horizontal plane and a vertical plane is adjustable and controllable, the twist angle formed by forming curved surface cross sections is adjustable and controllable, and accordingly the rebound deformation of section bars during bending and twisting is completely controlled. In addition, the die forming curved surfaces different in curvature radius and twist angle can be established by using the same group of forming curved surface modules, and the purpose of achieving stretch bending of different forming parts by using a group of forming curved surface modules.

Description

technical field [0001] The invention relates to a stretch bending and torsion forming die and a dynamic forming process for a profile. It belongs to the field of mechanical engineering and can be widely used in the production of streamlined three-dimensional structural parts of walking machinery, aerospace vehicles and artistic modeling engineering. Background technique [0002] With the advancement of modern technology and the improvement of people's quality of life and appreciation, most of the traveling machinery and equipment represented by high-speed trains, EMUs and automobiles have adopted streamlined design structures with small air resistance and beautiful appearance. The modern plastic art project represented by the Beijing Olympic venue - the Bird's Nest also adopts the welded structural modeling of three-dimensional bending and twisting parts of profiles. The application range of three-dimensional bending and twisting parts of profiles is very wide, but the form...

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Problems solved by technology

That is to say, it is equivalent to bending and twisting the profile into sections of broken lines. After forming, the traces of the broken lines of the profile are too obvious, the forming error is too large, it is difficult to disassemble and supplement the pads, a lot of manual correction and grinding are required, and it has a great impact on the mechanical strength of the parts. damage, time consuming

[0004] Due to the current theoretical analysis, empirical coefficients and c

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