TA18高强钛管数控弯曲成形截面扁化研究

Research on section flattening in numerical control bending process of TA18 high strength tube

摘要:

截面扁化是管材弯曲成形过程中不可避免的物理现象，而严重的截面扁化会影响弯管件的合理装配，从而制约其广泛应用。本文建立了考虑收缩应变比和弹性模量变化的钛管数控弯曲成形有限元模型，研究了不同几何条件和不同工艺条件下TA18钛管的截面扁化行为。结果表明：同时考虑收缩应变比和弹性模量变化规律可使截面扁化量发生改变，对变化规律无显著影响。获得了合理的几何、工艺参数范围。为研究TA18钛管的成形预测与控制并最终实现精确成形提供了依据。

Abstract:

Section flattening is an inevitable physical phenomenon in the forming process of tube bending, and severe section flattening will affect the reasonable assembly of the tube fittings, and therefore restricts its wide application. Finite element (FE) model for numerical control (NC) bending of titanium tube considering the variation law of contractile strain ratio (CSR) and the Young"s modulus (E) is established in this paper. The section flattening behaviors of TA18 tube under different geometric conditions and different process conditions have been investigated. The results show that considering the variation law of CSR-E can make the cross-section change, which has no remarkable influence on the change law. The reasonable range of geometric and process parameters are obtained, which provides a basis for studying the forming prediction and controlling the final precision for the NC bending of TA18 tube.