镦粗极限变形程度,指的是圓柱形坯料在一定条件下镦粗时,材料连续性不破坏情况下能承受的变形程度。由于镦粗过程是锻压生产中的常用工序以及镦粗过程能较好地反映体积成形过程中金属材料塑性变形的特征,因此,镦粗极限变形程度成为评定金属材料塑性成形时加工性的重要指标。通常,镦粗极限变形程度可以用实验方法确定。以出现第一道表面裂纹之前的变形程度作为镦粗极限变形程度。这是一项非常麻烦的工作。特别是, Upsetting the ultimate deformation degree, refers to the cylindrical blank upset under certain conditions, the material continuity without damage under the extent of the deformation can withstand. As the upsetting process is commonly used in forging production process and the upsetting process can better reflect the characteristics of plastic deformation during the metal forming process, the ultimate deformation of upsetting becomes an important index to evaluate the processability of plastic forming of metal materials . In general, the extent of upsetting deformation can be determined experimentally. The degree of deformation before the appearance of the first surface crack was taken as the degree of upsetting deformation. This is a very troublesome job. especially,