论文部分内容阅读
众所周知,承受锻造或冲压变形体内的应力是三维空间不均匀的应力状态.正如镦粗时引起的不均匀变形一样,其变形过程所产生的附加二次拉应力降低了变形体的塑性、影响了加工的继续进行;但若改变其变形方式,提高主压应力,则可以提高变形体的塑性,达到提高一次变形程度的目的.这对减少加工工序,提高生产率和材料利用率显然是很有意义的.叶轮离心热挤压工艺就是依上述原理提出的.
It is well known that the stress in the body subjected to forging or stamping deformation is a stress state in which the three-dimensional space is not uniform, just like the inhomogeneous deformation caused by upsetting, the additional secondary tensile stress generated during the deformation reduces the plasticity of the deformed body, affecting However, if the deformation mode is changed and the principal compressive stress is increased, the plasticity of the deformed body can be increased and the degree of primary deformation can be improved, which is obviously significant for reducing the processing steps, increasing the productivity and material utilization Impeller centrifugal hot extrusion process is based on the above principle.