Process Design in Metal Forming

这一建议是进一步发展新颖的逆向跟踪程序，以设计用作金属成形过程中起始坯料的预成形件。该程序利用了有限元法对成形过程进行正向模拟和反向跟踪的能力。研究者目前获得的NSF资助为这项工作奠定了基础，并证明了在复杂热粘塑性变形领域研究预成形设计及其优化现在是可能的。提出了准则和方法的发展、三维热粘塑性变形的有限元方法的发展以及在有限元方案中实施逆向追踪程序的研究。该方法的具体应用是无闪蒸轴对称锻造和三维板轧制中的预成形设计。这种方法很新颖。该方法应减少，或在某些情况下，消除需要设计师的经验，在设计预制件。该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.