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将粉末冶金用于铝合金发动机汽缸体意味着对材料切削加工性能的一种挑战。除了要求静态与疲劳强度之外,为了能够对发动机汽缸体组件进行有效地镗孔,材料的切削加工性状还必须和铝合金相容。为了满足这项应用提出的要求,开发了含有六方氮化硼的粉末配方。这项重要发展包括材料选择、切削性评价,以及静态与动态强度试验。为确定轴承盖最关键的部位进行了有限元分析(FEA)。轴承盖是在经过金相检验、尺寸变化测定、静态与疲劳试验之后,进行制造与鉴定的。对制造工艺提出并实行了一些改进。轴承盖顺利地进行了切削加工,并通过了用户的发动机试验。此后,这些轴承盖在数以百万件计地进行生产。
The use of powder metallurgy in aluminum alloy engine blocks implies a challenge to the machinability of the material. In addition to requiring static and fatigue strength, the machinability of the material must also be compatible with the aluminum alloy in order to be able to effectively bore the engine block assembly. In order to meet the requirements of this application, a powder formulation containing hexagonal boron nitride has been developed. Important developments include material selection, machinability evaluation, and static and dynamic strength testing. Finite element analysis (FEA) was performed to determine the most critical part of the bearing cap. Bearing cap is in the metallographic examination, dimensional change determination, static and fatigue test, the manufacture and identification. Made and implemented some improvements to the manufacturing process. Bearing cover smoothly machined, and passed the user’s engine test. Since then, these bearing caps have been produced on millions of items.