基于计算机仿真优化的钢管冷拔过程CAD系统

为了开发一个特殊的钢管冷拔工艺过程 CAD系统 ,除考虑现场实际资料与经验外 ,还利用 MARC软件进行约 1 0 0 0次的钢管冷拔过程计算机仿真模拟。这些仿真试验覆盖各种可能的工艺变形条件。仿真研究的结果经过分析处理、模型化而直接引入 CAD系统中 ,使该 CAD系统可以帮助各冷拔企业快速有效地设计优化的拔制规程。

Development of Neural-Based Generalized Predictive Control System of Strip Shape for a Reversal 6-High Mill

In order to develop a special CAD system for tube cold drawing, the practical data and experience have been put into consideration as usual, and with the help of MARC software, the finite element simulations have been carried out over 1 000 times under widely possible processing parameters. After being analyzed and modeled, the results of the simulations are directly introduced into the CAD system, so that the CAD is capable of helping tube manufacturers notonly arrange their drawing procedure system easily and efficiently, but also optimize their drawing processes in several aspects, such as drawing force, die geometry, plug geometry, distribution of reduction, accuracy of tube dimension, consumption of deforming work, quality of tube, and so on. The optimized cold drawing procedures are able to lower production cost by 1 %—5 % in average.

铝合金矩形管拉拔成形质量因素分析优化

应用有限元模拟软件MARC对铝合金矩形管拉拔成形质量影响因素进行模拟仿真。对拉拔速度、模具入模角和摩擦因子三个工艺参数进行分析,通过比较等效塑性应变的分布、残余应力、拉拔载荷的影响规律以及成品管的尺寸精度,得到了较优的拉拔工艺方案。采用优化后的方案生产试制的成品管表面质量良好,尺寸合格,与模拟相吻合。

基于数值模拟的拔伸成形工艺分析与优化

变薄拔伸是厚壁深筒件生产的关键工序，成形难度大。针对现行的拔伸成形工艺。为改善成形稳定性、提高成形质量、延长模具寿命，通过采用刚粘塑性有限元法，根据不同参数和条件，在计算机上时拔伸工艺进行数值模拟分析，分别讨论了拔伸模圈道数、变形量分配、模圈间距及入模角等因素对拔伸成形过程的影响，进而提出了“多模短距长拔”、变形量依次递减和较小入模角等优化措施。这样既减少了大量现场试验，又达到了工艺优化的目的。