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摘要：
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针对复杂挤压件在实际生产中存在的金属折叠等缺陷,结合CAE仿真结果分析了产生缺陷的原因;为了达到改善零件成形过程中的金属流动性、降低成形所需最大挤压力,从而提高产品质量的目的,提出了以移动最小二乘法为基础构建响应曲面的方法,建立了毛坯形状与成形所需最大挤压力之间的关系。同时,选取毛坯的几何参数作为设计变量,结合正交试验方法,选出对优化目标影响显著的因素,利用移动最小二乘响应曲面法对毛坯的关键几何参数进行了优化。经验证,成形所需的最大挤压力降低了40%,金属流动状态明显改善,内部折叠基本消除。
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The cause of folding defect was analyzed according to the simulation result of the complicated extrusion part.In order to improve the flow performance during the forming process and reduce the maximum forming force,a moving least square based on response surface method was proposed to describe the relationship between preform shape and the maximum forming force.With the preform shape geometry parameters being selected as design variables,Taguchi method was used to select the significant factors.The optimization of the preform shape was achieved by using moving least square based on response surface method.The result of the simulation shows that the maximum forming force is reduced by 40%,the flow performance during the forming process is improved,the folding defect is reduced,and the quality of the part is improved.
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基金项目：
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作者简介：
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参考文献：
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[1]杨长顺.冷挤压工艺实践[M].北京:国防工业出版社,1984.
[2]Fourment L,Chenot J L.Optimal design for non-steady-state metal forming process-I shape optimization method[J].International Journal for Numerical Methods in Engineering,1996,39(1):33-50.
[3]Kusiak J.A technique of tool-shape optimization in largescale problems of metal forming[J].Journal of MaterialsProcessing Technology,1996,57(1-2):79-84.
[4]Repalle J,Grandhi R V.Design of forging process variablesunder uncertainties[J].J.Mater.Eng.Perform,2005,14,(1):123-131.
[5]Myers R H,Montgomery D C.Response Surface Methodol-ogy:Process and Product Optimization Using Designed Ex-periments[M].New York:J.Wiley,2002.
[6]Piotr Breitkopf,Hakim Naceur,Alain Rassineux,et al.Moving least squares response surface approximation:formu-lation and metal forming applications[J].Computers andStructures,2005,83:1411-1428.
[7]谢建新,刘静安.金属挤压理论与技术[M].北京:冶金工业出版社,2001.
[8]洪慎章.冷挤压零件的工艺设计[J].模具技术,2004,(3):43-46.
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