摘要：针对发动机同步带轮的粉末冶金成形工艺,根据同步带轮的结构特点和粉末冶金模具设计原理,采用成形速度和成形速率相等原理设计同步带轮成形模具;采用变模数设计法设计成形中模;对定位孔提出采用成形芯棒的设计方案;将设计的模具图建立模具组立图,理论分析所设计模具方案的可行性;通过模具装机实验,验证成形模具设计的合理性。结果表明,试生产的同步带轮经过烧结等工艺达到了客户在精度、性能等方面的技术指标,并且提高了齿形精度和模具的使用寿命,成功开发了发动机同步带轮成形模具。

关键词：同步带轮；粉末冶金；模具设计；成形工艺

Abstract： Aiming at the forming process for powder metallurgy of engine timing belt pulleys, the timing belt pulleys were designed according to structural characteristics of the timing pulleys and powder metallurgy mold design principles and using the principle of forming speed equaling to forming rate. The forming die was developed by the modulus design method. The forming mandrel design method for positioning holes was proposed. Through installing the assembly diagram by designed mold diagrams, the feasibility of the designed forming mold was analyzed theoretically. The reasonableness of the forming mold design was verified by mold installation experiments. The results show that the pilot productions of timing pulleys after sintering process meet to the need of customer in terms of technical indicators such as accuracy and performance. The profile accuracy and the mold life are improved, thus the engine timing pulleys mold is successful developed. 

Keywords: timing pulley; powder metallurgy; mold design; forming technology