中国机械工程
中國機械工程
중국궤계공정
CHINA MECHANICAl ENGINEERING
2011年
13期
1620-1623
,共4页
屈服强度%剪切应力%疲劳源%变速箱齿轮
屈服彊度%剪切應力%疲勞源%變速箱齒輪
굴복강도%전절응력%피로원%변속상치륜
yielding strength%shearing stress%fatigue source%gear of gear box
基于局部屈服强度值方法判定准则,以拖拉机变速箱主动弧齿轮为例,进行了硬齿轮疲劳裂纹源的判定分析和生产实际验证。通过硬齿轮表层上剪切应力的分析以及硬度与强度之间的转换关系,得到了齿轮沿齿面深度方向的剪切应力与剪切强度分布,判断出自表面下0.4~0.45mm之间是疲劳裂纹源的萌生区域,分析了表层下疲劳失效形式和转化的机理,并以大量失效齿轮的观察分析进行验证。结果表明,这一基于应力/强度的判定方法可以直观、快速地进行疲劳失效形式和疲劳裂纹源预测判定。
基于跼部屈服彊度值方法判定準則,以拖拉機變速箱主動弧齒輪為例,進行瞭硬齒輪疲勞裂紋源的判定分析和生產實際驗證。通過硬齒輪錶層上剪切應力的分析以及硬度與彊度之間的轉換關繫,得到瞭齒輪沿齒麵深度方嚮的剪切應力與剪切彊度分佈,判斷齣自錶麵下0.4~0.45mm之間是疲勞裂紋源的萌生區域,分析瞭錶層下疲勞失效形式和轉化的機理,併以大量失效齒輪的觀察分析進行驗證。結果錶明,這一基于應力/彊度的判定方法可以直觀、快速地進行疲勞失效形式和疲勞裂紋源預測判定。
기우국부굴복강도치방법판정준칙,이타랍궤변속상주동호치륜위례,진행료경치륜피로렬문원적판정분석화생산실제험증。통과경치륜표층상전절응력적분석이급경도여강도지간적전환관계,득도료치륜연치면심도방향적전절응력여전절강도분포,판단출자표면하0.4~0.45mm지간시피로렬문원적맹생구역,분석료표층하피로실효형식화전화적궤리,병이대량실효치륜적관찰분석진행험증。결과표명,저일기우응력/강도적판정방법가이직관、쾌속지진행피로실효형식화피로렬문원예측판정。
This paper analyzed the decision factors of fatigue crack sources of hard gears,and produced a test for their practical production,according to the value of part yielding strength,and took active gear with curved teeth of tractor gear box for example.Through the analysis of shearing stress on the gear surface and the transformation between hardness and strength,the distribution of shearing stress and shearing hardness in the depth direction of gear surface can be obtained.The producing area of fatigue crack source is 0.4~0.45mm under the surface.Simultaneously,this paper analyzed the forms of fatigue crack and mechanism of transformation,and tested by observation and analyses of quantity of fatigue gears.The results demonstrate that this decision method which is based on the stress/hardness can decide the forms of fatigue failure and the source of fatigue crack intuitively and directly.
