VoL23 No.3 崔成林等：半固态触变压射成形过程模拟及验证 ·239. 验结果，试样壁厚分别为15,10和3mm.在壁厚 计算半固态金属的触变铸造充型过程，在一定 3mm处的流动速度在8m/s左右，半固态金属 程度上可模拟半固态金属充填成形过程 没有喷溅发生，半固态金属充填型腔是按层流 (③)充型过程中的半固态金属自由表面为较 流动方式进行 平滑的变形的抛物面，而模拟结果为标准抛物 图3是壁厚20mm×60mm和5mm×60mm 面，剪切速率对表观粘度的影响不可忽略， 的阶梯试样成形实验结果，其中在20mm壁厚 参考文献 处有一个50mm的圆孔，最小截面处的半固态 1 Hirt G,Cremer R,Witulski T.et al.Advances in Thixof- 金属流动速度可达8m/s.模拟结果与试样的成 orming-Plant Technology,Component Manufacturing and 形结果完全一致，没有发生任何喷溅现象 Simulation.North American Die Casting Association Transaction,1997,113-6:377 2 Cardarella JJ,Creeden T P,Dax F R.Effects of Injection and Intensification Pressure on Semi-solid Metalworking Part Quality.North American Die Casting Association Transaction,1997,11(3-6):283 Loue W R.Bardinet F,Alexandrou A.Modelling the Thixoforing Process.North American Die Casting Asso- 图3阶梯试样成形结果 ciation Transaction,1997,11(3-6):396 Fig.3 Forming results of the step casting 4呼延青.国外流变转造发展概况.特种；造及有色合 4结论 金，1983,3：1 5 Liu Jun,Spalding D B.Numerical Simulation of Flows with Moving Interfaces. Physicochenical Hydrodyna- (1)半固态金属充型过程近似看成是单相等 mic5,1988,10(5):625 温层流流动 (2)利用流体力学中计算层流流动的方法来 Verification and Numerical Simulation for Semi-solid Modeling the Thixoforming Process CUI Chenglin,MAO Weimin,ZHAO Aimin,ZHONG Xueyou Material Science and Engineering School,UST Beijing.Beijing 100083,China ABSTRACT Based on floe-varying characteristics of thixotropic casting semisolid alloys,the flowing state of the semisolid alloy and the procedures as filling up the mould by means of thixotropic casting being per- formed,is simplified to the flow which features in an equal temperature layers,and it also is simulated and verified.The analogical results corresponds to that of filling up mould. KEY WORDS semisolid alloys;thixoforming;numerical simulation