一、前言齿环是汽车变速箱同步器的关键部件之一,理想的成形工艺是精密锻造。为了合理的选择设备吨位,掌握飞边尺寸对锻件充填性及变形抗力的影响,精确地计算毛坯尺寸,合理地设计模具,研究精锻齿环的变形抗力是很有必要。二、齿环精锻成形时的金属流动分析精锻齿环的毛坯为环形铜坯。其成形过程是先把毛坯加热至850℃,模具预热至100～200℃,然后将毛坯置于凹模模膛内。在300T的摩擦压力机上锻造成形。金属流动可分成三 I. Introduction The gear ring is one of the key components of an automotive gearbox synchronizer. The ideal forming process is precision forging. In order to reasonably choose the tonnage of equipment, to grasp the influence of flash size on the filling and deformation resistance of forgings, it is necessary to calculate the blank size accurately and to design the mold rationally. It is necessary to study the deformation resistance of precision forged gear ring. Second, the metal ring when the precision forging flow analysis Forging gear ring rough for the annular copper blank. The forming process is to first heat the blank to 850 ° C., preheat the die to 100-200 ° C., and then place the blank in the die cavity. Forging on a 300T friction press. Metal flow can be divided into three