公开(公告)号：US20090145568A1

公开(公告)日：2009-06-11

申请号：US12368095

申请日：2009-02-09

申请人： Bimal Kumar Chaterjee ,  Alan Phillips ,  John Robert Kriaski ,  Daniel Paxton wall

发明人： Bimal Kumar Chaterjee ,  Alan Phillips ,  John Robert Kriaski ,  Daniel Paxton wall

IPC分类号： B22D27/00

CPC分类号： B25B23/141 ,  F16D1/10 ,  F16D1/112 ,  F16D7/042 ,  F16D2001/102 ,  Y10T29/49963

摘要： A method of making a wear and fatigue resistant component of a power tool (e.g., a clutch) includes providing a quantity of base steel and a quantity of alloying elements to be added to the base steel to form a desired alloyed grade of steel. The base steel and alloying elements are combined and melted to produce a molten alloyed steel (e.g., SAE 9310 or AISI M2). The molten alloyed steel is cast using a near-net-shape investment casting process to form a component of a power tool. An edge of the component is pre-radiused. and the component is case hardened after the edge of the component has been pre-radiused. In one implementation, the component is a clutch that has a lifespan of at least twice a lifespan of a second clutch that has not been pre-radiused prior to case hardening.

摘要翻译： 制造动力工具（例如离合器）的耐磨损和耐疲劳部件的方法包括提供一定量的基础钢和一定量的合金元素以加入到基础钢中以形成期望的合金等级的钢。 将基础钢和合金元素组合并熔化以产生熔融合金钢（例如SAE 9310或AISI M2）。 熔融合金钢使用近净型熔模铸造工艺铸造以形成电动工具的部件。 组件的边缘是预先加工的。 并且组件在组件的边缘已经被预先弯曲之后被表面硬化。 在一个实施方案中，部件是离合器，其寿命至少是在表面硬化之前未被预先倒圆的第二离合器的寿命的两倍。