以实用化为目标，对１５＃钢、４５＃钢、２０ＣｒＭｎＴｉ直齿圆柱齿轮冷精锻工艺进行系统研究，提出闭式镦挤—约束孔分流两步成形实用化工艺方案和基于变位理论的齿形凹模修正设计方法。研究结果表明，两步成形法是降低直齿圆柱齿轮冷精锻成形力的有效方法，采用齿形凹模修正设计方法可获得较高的齿形精度。 In order to practicalize, the cold precision forging process of 15 # steel, 45 # steel and 20CrMnTi spur gear was systematically studied, and the practical application of closed upsetting-constrained hole diversion two-step forming process and the theory of displacement Toothed Die Modification Design Method. The results show that the two-step forming method is an effective method to reduce the cold forging forming force of the spur gear, and the tooth profile precision can be obtained by using the design method of the tooth form concave die modification.