Shape acquisition method of high-strength steel pipe after three-dimensional bending forming resilience

Abstract

The invention discloses a shape acquisition method of a high-strength steel pipe after three-dimensional bending forming resilience. The shape acquisition method comprises the following steps of 1, acquiring radius values of all two-dimensional planar curves after performing arc fitting and approximation and performing division and projection on a central axis of a die to form the two-dimensional planar curves; 2, acquiring a central axis of a shape after three-dimensional bending resilience when the pipe is independently under each segment of die; 3, splicing the central axis of the shape after three-dimensional bending resilience when the pipe is independently under each segment of die to obtain a spliced curve Q; and 4, correcting the spliced curve Q to acquire the shape of the pipe after three-dimensional bending forming. By the method, the shape of the pipe after three-dimensional bending forming can be acquired on the condition of no test, the method is used for guiding die design, high cost brought by experiments is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a method for obtaining the shape of a pipe after bending and forming springback, in particular to a method for obtaining the shape of a high-strength steel pipe after three-dimensional bending and forming after springback. [0002] technical background [0003] The tube structure is widely used in the construction and transportation industries due to its high structural strength, less material consumption, easy processing and many other advantages. However, with the development of the times, people have higher and higher requirements for the shape accuracy of pipe structures; however, it is not easy to guarantee the high shape accuracy, especially for the shape accuracy of three-dimensional space elbows with relatively complex structures. [0004] Bending and forming of metal materials will produce springback, and the inaccurate calculation or poor control of the springback amount is the main reason why the shape accuracy is dif...

AI Technical Summary

Problems solved by technology

At present, it is possible to obtain the shape of the pipe after two-dimensional bending and springback without doing experiments, but there are still defects in the acquisition of the shape of the pipe after three-dimensional bending and springback

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