关键词: NTR弯曲镦锻, 物理模拟, 几何相似性, 运动学相似性, 动力学相似性

Abstract:

The geometric,kinematics and dynamics similarity of crankshaft NTR upset-bending physical simulation system to the prototype system were studied. Based on the similarity theorem this simulation system met the geometric and the kinematics similarity conditions to the prototype system and when the relative coefficient α=0.05 they met the approximate dynamics similarity conditions. A NTR upset-bending experiment for one lead crankshaft billet was carried out on this physical simulation system, taking the 42CrMo steel 6G32 crankshaft as the prototype. The small crankshaft forming in this trial had sunks and flashes similar to the large forgings obtained in actual forming process. The dimension scale between the design size of the prototype and the main structure dimensions of the lead forging is as the same as the geometric similarity coefficient of two systems. The change of the force data recorded in the sensors in forming process is consistent with the expected trend.

Key words: NTR upset-bending, physical simulation, geometric similarity, kinematics similarity, dynamics similarity