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首页> 外文会议>2002 World Congress on Powder Metallurgy amp; Particulate Materials Pt.5 Jun 16-21, 2002 Orlando, FI >DESIGN FOR ROLLING CONTACT FATIGUE
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DESIGN FOR ROLLING CONTACT FATIGUE

机译：滚动接触疲劳设计

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摘要

The use of P/M materials is rapidly expanding to include the manufacture of structural parts such as gears and camshaft lobes. Components such as these are highly loaded under rolling contact conditions. However, when selecting materials, especially P/M materials, for use involving rolling contact conditions, the lack of reliable test data and the lack of reliable methods to predict contact fatigue life have proven to be a tremendous obstacle. To insure that P/M materials have the ability to compete with wrought steels, costly and time consuming tests are carried out on finished parts and additional safety factors are applied in order to avoid failure under service conditions. The paper gives an overview of the state of the art in rolling contact fatigue design of gears. A summary of gear design parameters and their effect on rolling contact fatigue conditions is given. Surface and subsurface stress distribution has been studied under various contact conditions such as elliptical vs. line contact, variation of gear design parameters, sliding, and lubrication. Failure modes and their relationship to material properties and contact conditions are discussed. Several rigs to test materials under rolling contact are discussed and compared in regard to their importance for gear applications. In addition, actual test results on P/M materials under constant and variable loadings are presented. The effect of sliding, density, chemical composition, sintering conditions, and surface treatment, which are major factors for contact fatigue life, are discussed in detail. Advanced P/M technologies such as warm compacting, sinter hardening, and use of special powder mixtures may be beneficial for rolling contact applications. Improved fatigue life may justify higher production costs correlated with those technologies. Finally, examples of transformation of test results into actual gear design are given.
机译：P / M材料的用途正在迅速扩展，包括制造齿轮和凸轮轴凸角等结构零件。诸如此类的组件在滚动接触条件下承受高负荷。但是，在选择涉及滚动接触条件的材料（尤其是P / M材料）时，事实证明，缺乏可靠的测试数据和缺乏可靠的方法来预测接触疲劳寿命是一个巨大的障碍。为了确保P / M材料具有与锻钢竞争的能力，对成品零件进行了昂贵且费时的测试，并采用了附加的安全系数，以避免在使用条件下发生故障。本文概述了齿轮滚动接触疲劳设计的最新技术。总结了齿轮设计参数及其对滚动接触疲劳条件的影响。已经研究了在各种接触条件下的表面和次表面应力分布，例如椭圆与线接触，齿轮设计参数的变化，滑动和润滑。讨论了失效模式及其与材料性能和接触条件的关系。讨论了几种在滚动接触下测试材料的钻机，并就它们在齿轮应用中的重要性进行了比较。此外，还提供了在恒定和可变载荷下对P / M材料的实际测试结果。详细讨论了滑动，密度，化学成分，烧结条件和表面处理的影响，它们是接触疲劳寿命的主要因素。先进的P / M技术（例如热压，烧结硬化和使用特殊的粉末混合物）可能对滚动接触应用有利。改善的疲劳寿命可以证明与这些技术相关的更高的生产成本。最后，给出了将测试结果转换为实际齿轮设计的示例。

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