毕业论文楔横轧轴类零件塑性成形新工艺.doc

摘 要 由于楔横轧技术属于多学科交叉问题，对新产品设计由于尚未形成系统的理论科学，反复试制所造成的时间和费用消耗巨大。所以，开展零件精确轧制成形机理仿真研究，解决零件成形过程影响产品质量的关键问题，对建立零件轧制系统科学理论具有重要意义。 本文通过DEFORM有限元软件理论建模，对二辊楔横轧整个轧制过程进行了模拟计算.利用正交试验法，对各种轧制力能影响因素进行了全面系统地深入研究。它对轧机的能力衡量、刚度设计、工艺优化等方面都具有重要的实际应用价值。 论文在前人研究的基础上，对二辊楔横轧轧件心部点的各种应力应变曲线进行全程跟踪，得出交变的剪应力和剪应变是轧件发生环状疏松的主要原因。本文建立了二辊楔横轧轧制轴类零件的有限元模型。研究了轴类件成形的各种应力场分布，分析了轧件塑性成形规律及轧制力能参数，为认识和解决轴类零件成形规律提供了理论基础。 关键词:二辊楔横轧 轴类件 刚塑性有限元法 数值模拟 Abstract Cross wedge rolling technology belongs to a multidisciplinary intersect problem, and a systemic theoretical science on new products designing has not been established.the time and expense is very large for iterate trial-manufacture,so carrying out the simulation study on part precision roll forming mechanism,solving the key problem of product quality during the part forming process,it is of far reaching importance to foundation rolling system science. In this paper the numerical simulation on the wholly rolling process of two cross wedge rolling has been finished, by using finite element software DEFORM. Different kinds of influencing factors of draught pressure have been over all and systematically lucubrated,by utilizing orthogonal experiment. It possess important practical application value to roll ability scale, rigidity designing and process optimize optimization. Based on the before investigative substructure,this paper proceeds all-the-way tracking to different kinds of stress-strained curve of the work pieces centre by two cross wedge rolling, and finds out that alternating shear stress and shearing strain are the first causes to the ring loose at work pieces centre.a thermal-mechanical coupled model for 2 –roll cross wedge rolling of shaft has been established in this paper.The study on stress and strain field distribution of the workpiece is given. It offers theoretical principle for realizing and solving the figuration law of shaft. Key words : two cross wedge rolling rigid-plastic finite element method numerical analysis  绪 论 楔横轧技术及其发展