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1.多余度系数的概念金属压力加工成型过程中都包含两类变形。一类是改变金属形状所要求的变形,称为必要应变。必要应变是在外力直接作用下由均匀变形产生,故又叫均匀应变,它仅取决于设备的几何因素(工具形状,机器的调整量),而与被加工材料的性能无关。另一类是对形状改变并不必要的变形,称为多余应变。多余应变是由不均匀变形产生。多余应变将导致材料内部产生各种形式的附加应力,从而对工作负荷,力矩大小和变形的剧
1. The concept of excess coefficient Metal pressure forming process includes two types of deformation. One is to change the shape required by the deformation, known as the necessary strain. Necessary strain is generated by uniform deformation under the direct action of external force, so it is also called uniform strain. It depends on the geometric factors of the equipment (shape of the tool, adjustment of the machine) and has nothing to do with the performance of the material to be processed. The other is deformation that is not necessary for shape changes, called excess strain. Excess strain is caused by uneven deformation. Excessive strain will lead to various forms of internal stress in the material, so that the workload, torque and deformation of the drama