Process Design in Metal Forming

这一建议是为了进一步发展用于设计作为金属成形过程中的起始料的预制件的新的回溯追踪法。该程序利用有限元方法对成形过程进行正向模拟和反向追踪的能力。研究人员目前的NSF拨款为这项工作奠定了基础，并表明现在有可能在复杂的热粘塑性变形领域研究预制件设计及其优化。在准则和方法的发展、三维热粘塑性变形有限元方法的发展以及在有限元格式中实施反向追踪过程等方面进行了研究。该方法的具体应用是闭口轴对称锻造和三维板轧制中的预制件设计。这种方法很新颖。在某些情况下，这种方法应该减少或消除设计者在预制件设计中对经验的需要。提出的方法将为未来金属成形技术的设计开辟一条新的途径。

This proposal is to further develop the novel backward tracing procedure for designing preforms utilized as starting stock in the metal forming process. The procedure uses capability of forward simulation and backward tracing of a forming process by the finite element method. The investigator's current NSF grant has laid the foundation for this work and has demonstrated that it is now possible to investigate preform design and its optimization in the area of complex thermo-viscoplastic deformation. Investigations are proposed on the development of criteria and methodology, development of the finite element method for three dimensional thermo- viscoplastic deformation and implementation of the backward tracing procedure into the finite element scheme. Specific applications of the method which will be investigated are preform design in flashless axisymmetric forging and in three dimensional plate rolling. The approach is novel. The method should reduce, or eliminate in some cases, the need of the designer's experience in the designing of preforms. The proposed approach should open a new avenue for design in future metal forming technology.