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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.2; 20051026-28; Nanjing(CN) >Numerical Simulation of the Stretch-bending Process for the Extrusion in a Vehicle Doorframe
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Numerical Simulation of the Stretch-bending Process for the Extrusion in a Vehicle Doorframe

机译：车门框内拉伸过程的拉伸弯曲数值模拟

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摘要

Computer simulation technology gets more and more applications in the metal forming processes. The high precision stretch bending of extrusions becomes the key technology for space frame of car body. In this paper, a non-linear finite element analysis (FEA) software LS-DYNA is used to simulate the stretch-bending process for the extrusion in a vehicle doorframe. The relationships between the deviation of the cross section and the process parameters are mainly investigated. In order to find the influence of manufacturing parameters to the deviation of the cross section, the following numerical simulations are done. They are press-bending and stretch-bending, three stretch-bending procedure modes, i.e. stretch-bending (P-M mode), bending-stretch (M-P mode) and streteh-bending-stretch (P-M-P mode). In P-M-P mode, the influences of pre-stretch force Fpre and the friction coefficient fs are also considered. The studies show that stretch-bending has much less deviation of the cross section than the press-bending; In the stretch-bending processes, the procedure modes and the pre-stretch force Fpre have small effects on the deviation, but the friction between the workpiece and die does reduce the cross section distortion.
机译：计算机仿真技术在金属成型过程中得到越来越多的应用。挤压件的高精度拉伸弯曲成为车身空间框架的关键技术。在本文中，使用非线性有限元分析（FEA）软件LS-DYNA来模拟车门框架中拉伸的拉伸弯曲过程。主要研究横截面偏差与工艺参数之间的关系。为了找到制造参数对横截面偏差的影响，进行了以下数值模拟。它们是压力弯曲和拉伸弯曲，三种拉伸弯曲过程模式，即拉伸弯曲（P-M模式），弯曲拉伸（M-P模式）和硬挺弯曲弯曲（P-M-P模式）。在P-M-P模式下，还考虑了预拉伸力Fpre和摩擦系数fs的影响。研究表明，与弯曲弯曲相比，拉伸弯曲的横截面偏差要小得多。在拉伸弯曲过程中，过程模式和预拉伸力Fpre对偏差的影响很小，但工件与模具之间的摩擦力确实减小了截面变形。

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