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针对大型圆筒锻件芯轴扩孔过程的塑性变形特点,结合物理与数值模拟方法分析了平面应变假设的条件。在此基础上,应用数值模拟方法研究了圆筒锻件扩孔过程的塑性变形及其主要影响因素。研究发现,对大型筒形件进行芯轴扩孔加工,合理的下压量、芯轴尺寸以及转动的角度是保证成型质量的重要参数,且平面应变假设须建立在长度尺寸远大于横向尺寸的情况下,这时坯料端头的横向难变形区是产生误差的主要因素。
According to the plastic deformation characteristics of mandrel reaming process of large cylindrical forgings, the conditions of plane strain assumption are analyzed by combining physical and numerical simulation methods. On this basis, the plastic deformation of the forging process of the cylindrical forgings and its main influential factors were studied by numerical simulation. The study found that the mandrel reaming process for large cylindrical parts, a reasonable amount of pressure, the mandrel size and angle of rotation is an important parameter to ensure molding quality, and the plane strain hypothesis should be established in the length of the size is much larger than the lateral size Case, then the laterally deformed billet deformation is the main factor of error.