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| 标 题： |
2008 PM DESIGN EXCELLENCE AWARDS COMPETITION WINNERS
2008年PM设计卓越奖竞赛获奖者 |
| 作 者： |
Peter K. Johnson |
| 关键词： |
|
| 出版年： |
2008 |
| 期刊名： |
International Journal of Powder Metallurgy
粉末冶金国际期刊 |
| 年卷期： |
2008, vol.44, no.4 |
| 摘 要： |
PMG Fussen GmbH, Fiissen, Germany, and its customer Schaeffler Group Automotive, Hirschald, Germany, won the Grand Prize in the Automotive-Engine category for a stator (Figure 2) used in a variable valve timing (VVT) system in a 1.4 L engine. Made from a modified iron-copper PM material, the complex part is formed to a density of 7.0 g/cm{sup}3. The stator, featuring five intricate center holes, is a one-piece design that replaced two parts. It is compacted on a 450 mt press with three upper and two lower tooling levels. Tight tolerances help to minimize any internal oil leakage between the adjoining pressurized chambers. The PM stator helps reduce fuel consumption and the formation of exhaust gases, as well as improving engine performance, especially torque at low rotational speeds. It has two functions: a spline for the timing-belt pulley and the VVT housing. The PM process offered substantial cost savings despite finishing operations such as sizing, machining, deburring, and steam treating.
德国菲森PMG有限公司及其客户德国舍弗勒集团汽车公司（Hirschald）凭借用于1.4升发动机可变气门正时（VVT）系统的定子（图2），在汽车发动机类别中荣获大奖。该部件采用改良的铁铜磁性材料制成，密度为7.0 g/cm³。定子具有五个复杂的中心孔，采用一体式设计，取代了原本需分两部分加工的结构。它通过一台450吨压力机进行压制，配备三层上模和两层下模。严格的公差设计有效减少了相邻受压腔体之间的内部漏油问题。该PM定子有助于降低油耗、减少尾气排放，并提升发动机性能，特别是在低转速时的扭矩表现。其功能包括为正时皮带轮提供键槽以及支撑VVT壳体。尽管需要完成尺寸调整、机械加工、去毛刺和蒸汽处理等精加工工序，但采用PM工艺仍实现了显著的成本节约。 |
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