平面弯曲弹复理论及其工程应用研究进展

Springback theory of plane bending and progress of study on its engineering application

弯曲回弹是一种普遍的金属成形现象。随着材料加工技术的飞速发展以及产品制造业竞争的日趋激烈,对弯曲回弹的准确预测和精确控制成为亟需解决的关键问题。本文总结了燕山大学赵军课题组近几年关于平面弯曲弹复问题的研究工作,主要包括平面弯曲弹复方程、纯弯曲三定理及其在扩径矫圆、缩颈矫圆、过弯矫圆、大型管件矫直、型材拉弯、型钢多辊矫直和对称式三辊矫圆等方面的工程应用。这些研究成果不仅进一步丰富了经典弹塑性弯曲理论,也为工程中平面弯曲回弹问题的准确预测提供了理论依据。

Springback is the most common metal forming phenomenon. With the development of material process technology as well as increasingly fierce competition in product manufacturing, the accurate prediction and precise control of bending springback have been the key issue to solve. This paper summarizes the research works of Zhao Jun group in the resent years about the springback problem of plane bending, including the springback theory of plane bending, three theorems of pure bending, and engineering appli- cations, such as expanding roundness setting, compression roundness setting, over-bending roundness setting, large pipe straightening, profile stretch-bending, multi-roller straightening, symmetric three-roller setting round, and so on. These works not only further enrich the content of the classical theory of the elastic-plastic bending, but also provide a theoretical basis for the springback prediction in engineering problems.