金属塑性加工的物理模拟

PHYSICAL MODELING OF METAL FORMING PROCESSES

物理模拟是进行体积成形工艺研究和生产设计的重要工具方法 ,这种方法简捷、直观 ,还可以预测材料流动情况、填充情况和工艺缺陷形成过程。本文介绍了利用北欧新型模拟材料“菲蜡” ( Filia)进行体积成形物理模拟实验的方法、原理、设备装置、模具和模拟材料的特性。对圆柱坯料的自由镦粗、正挤、反挤、管件变薄挤压、平板坯料平面应变镦粗进行了物理模拟 ,分析讨论了物理模拟实验结果 ,并与上限模拟软件的结果进行了对比。

Physical modeling techniques are widely used in metal forming industries as an aid to the metal forming processes,especially for bulk metal forming processes,e.g.,cold forging processes.Although numerical modeling has been used in bulk metal forming research,physical modeling is still a dominated method in bulk metal forming industries and it has obtained great success in recent years.Physical modeling can be used to predict material flow,material filling and process defects.In the present paper,the principle,the tooling system and the modeling material Filia are introduced.Physical experiments of free upsetting,forward extrusion,backward extrusion,tube extrusion and plane strain upsetting are described.The experimental results are discussed and compared with the numerical results obtained with an upper bound theory software.