大型轴类零件快锻精密成形理论与实验研究

项目名称： 大型轴类零件快锻精密成形理论与实验研究

项目编号： No.51305289

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 杜诗文

作者单位： 太原科技大学

项目金额： 26万元

中文摘要： 针对大型轴类零件成形过程存在的加工余量大、尺寸精度低、浪费能源和材料等问题，提出一种双操作机夹持大型轴类零件快锻精密成形新工艺。采用理论分析、数值模拟和实验研究相结合的方法，研究轴类件快锻工艺中金属流动过程揭示其变形机制。采用热力模拟实验，探明钢坯在热力耦合变形过程中的塑性变形行为和组织演变机理；分析快锻工艺参数对轴类件成形质量的影响，优化工艺参数，达到提高轴类件成形精度，减小加工余量的目的；建立锻造过程中轴类件缺陷数值模型及物理模型，分析轴类件快锻过程缺陷产生及演变机理，揭示锻造过程中应力应变分布对心部缺陷焊合的影响，实现细化晶粒，消除组织缺陷的目的；分析快锻机与双操作机之间的参数匹配，提出轴类件精密成形过程中设备参数对轴类件质量的影响机理及提高质量的方法。建立大型轴类件快锻精密成形工艺理论，提高生产效率、降低生产成本，为大型轴类零件精密成形和批量生产提供一套新的高效的理论、工艺与方法。

中文关键词： 大型轴类锻件；精密成形；工艺优化；控制成形；

英文摘要： Based on the disadvantage of current processing techniques for heavy shaft forging such as large machining allowance, low dimension accuracy, materials and energy consumption, a new precision high-speed forging forming process where heavy shaft is clamped by two manipulators is proposed. By theory analysis, numerical simulation and experiment research, metal flow rule and the deformation mechanism during high-speed forging of heavy shaft forming are elaborated . Plastic deformation behavior and microstructure evolution mechanism of the billet during the thermal-mechanical couple deformation are studied by thermal simulation experiment. Effect of high-speed forging process parameters on forming quality of heavy shaft is researched and the process parameters are optimized in order to improve forming precision and decrease machining allowance.Numerical model and physical model are established during the forging process.Defect production and evolution mechanism is analyzed. Effect of distribution of stress and strain on inner defect closure is revealed so as to realize grain refinement and eliminate organization defects. Parameter matching between high-speed forging hydraulic machine and manipulators is also discussed. The influence mechanism of heavy shaft forming quality under different equipment parameters is re

英文关键词： Heavy shaft forging；Precision forming；Process optimization；Property-controlled forming；