Pipe liquid filled shear bending and forming method

Abstract

A pipe liquid filled shear bending and forming method capable of realizing a relative bending dadius Rb<=0.5 relates to a pipe bending and forming method. The invention solves the problem that pipe fittings with tiny semidiameters relatively bending cannot be machined in the existing bending technology. In the method, deformation is sheared to cause material flow and realize being, internal pressure support is realized by using a liquid medium, axial force and twisting force are realized by using a plunger chip for feeding and the motion of a loose mold, and the stress condition when pipe bending is adjusted by controlling the liquid pressure, the axial force and the twisting force in real time, thereby controlling deformational behavior. The method has the concrete steps of filling stage, forming stage and shaping stage. The inventive method keeps mould cavity formed by a fixed module and a moving module always tightly attach to an outer surface of a tube blank deformation segment during the whole process from a primary state of the pipe shear bending and deformation to a deformation ending state, and then to a compression and shaping state. The pipe fittings with tiny semidiameters in which the relatively bending semidiameter Rb is less than or equal to 0.5 can be manufactured by using the method in the invention.

Description

technical field [0001] The invention relates to a pipe bending forming method. Background technique [0002] Aeronautical and aerospace components require high reliability, high safety and lightest possible weight, so strict requirements are put forward for structural integrity, structural form and occupied space. It is necessary to ensure the overall reliability of the structure and at the same time On the basis of meeting the strength requirements, the lightest possible mass is adopted, and the smallest possible space is occupied under the premise of meeting the structural requirements. [0003] Due to the limitation of structural space, the pipelines of small aero-engines and UAVs require the use of extremely small bending radius tubes, and their relative bending radius R b ≤0.5(R b is the ratio of the radius r of the neutral layer of the pipe bending to the diameter D of the pipe, Figure 4 shown), the materials used include aluminum alloys, titanium alloys and superal...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem that the existing bending technology cannot process extremely small relative bending radius pipe fittings, the present invention further provides a method that can realize relative bending radius R b ≤0.5 pipe liquid-filled shear bending forming method

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