齿轮内在品质对齿轮强度和寿命的影响

Influence of Internal Quality of Gear on Strength and Life of Gear

齿轮的内在品质是由齿轮的材料品质、锻造品质和热处理工艺品质等所决定的。约有35%的齿轮的失效与齿轮内在品质太差有关。主要论述了渗碳淬火齿轮内在品质的部分项目(表层脱碳、内氧化、粗大马氏体、碳化物组织、非马氏体组织、黑色组织、残余奥氏体、晶粒度等)对齿轮强度和寿命的影响,其影响程度多数以试验结果的数据表示。用5种材料渗碳淬火齿轮的R-S-N曲线试验结果数据(齿轮脱碳层深度0.2~0.3 mm时,齿轮的弯曲疲劳极限应力σFlim降低23%~50%),说明了齿轮表面脱碳对齿轮弯曲疲劳强度的极大影响。

The internal quality of gear is determined by material quality,forging quality and heat treat-ment process quality.Failure of about 35%of the gears is related to their poor internal quality.The influence ofsome items of internal quality of carburizing quenching gear(surface decarburization,internal oxidation,coarse martensite,carbide structure,non-martensite structure,black structure,retained austenite,grainsize,etc.)on gear strength and life are mainly discussed,the degree of influence is mostly expressed by the da-ta of experimental results.Finally,the R-S-N curve test data(gear decarburization layer depth 0.2~0.3 mm,the bending endurance limit stressσFlimat tooth root is reduced by 23%~50%)of carburizing and quenchinggears with 5 materials show that the great influence of gear surface decarburization on gear bending fatiguestrength.