Powder metallurgy water pump band pulley class punch structure that takes shape

The utility model provides a powder metallurgy water pump band pulley class punch structure that takes shape, includes drift body, its characterized in that: a shaping is gone up to the outside of drift body annular face has and is used for preventing the dead straight flange chamfer step of mould card. At a drift outside increase straight flange chamfer step for the iron powder granule is directly fallen into in this step department, but not the fit clearance department between the mould has reduced the dead possibility of here mould card, has reduced the condemned emergence of mould. The utility model has the advantages of simple and reasonable structure, it is effectual to take shape, has solved water pump band pulley dead problem of mould card when shaping betterly, has reduced the waste in material and man -hour, has improved work efficiency simultaneously. 种粉末冶金水泵带轮类成形冲头结构，包括冲头本体，其特征在于：所述冲头本体的外侧环形面上成型有用于防止模具卡死的直边倒角台阶。在冲头外侧增加直边倒角台阶，使得铁粉颗粒直接掉入在此台阶处，而非模具间的配合间隙处，减少了此处模具卡死的可能，减少了模具报废的发生。本实用新型结构简单合理、成形效果好，较好地