冷滚打工艺参数对成形力及金属变形影响研究

冷滚打成形技术是一种常温状态下的金属体积成形技术，主要应用于零件外齿的成形。为分析工艺参数对成形过程中成形力和金属变形情况的影响规律，依据冷滚打成形原理和工艺特点，选取关键工艺参数，进行块体材料齿槽冷滚打成形试验和仿真。通过试验和仿真，研究成形过程中成形力和金属变形情况，解释在不同滚打方式下成形力的变化特点，阐明冷滚打成形工艺下金属的变形特点和成形缺陷产生的原因，讨论不同工艺参数对齿槽冷滚打成形成形力和成形质量的影响规律。结果表明：顺打时成形力小，逆打时成形力较稳定，不同滚打方式对成形精度影响不大；适当提高滚打密度有利于降低成形力并提高成形精度；相同滚打密度下主轴转速增大会增大成形力并诱发成形缺陷的发生。

Influences of Cold Roll-beating Forming Parameters on Forming Force and Metal Deformation

Cold roll-beating forming is a metal bulk forming technology at room temperature, which is mainly used in the forming of external teeth. The influences of forming parameters on forming force and metal deformation in cold roll-beating forming are studied. The key processing parameters are selected according to the principle and processing characteristics of cold roll-beating forming. The forming force and metal deformation in the forming process are obtained by experiment and simulation of tooth groove forming of bulk metal. The changing characteristics of forming force under different roll-beating ways are explained, and the deformation characteristics of metal and the causes of forming defects in cold rolling forming are expounded. The influences of different process parameters on the forming force and forming quality of tooth groove are discussed. The results show that for up-beating the forming force is small but unstable, and the different roll-beating ways have little influence on the forming accuracy;the roll-beating density can be suitably increased to reduce the forming force and improve the forming accuracy; and the spindle speed is increased to enlarge the forming force and induce the occurrence of forming defects under the condition of same roll-beating density.