【作者】 胡北；

【导师】 王黎钦；

【作者基本信息】 哈尔滨工业大学 ， 机械工程（专业学位）， 2020， 硕士

【摘要】 8Cr4Mo4V钢制轴承目前是我国应用于航空发动机主轴的重要零部件,影响着发动机的正常使用。8Cr4Mo4V钢制轴承套圈工作表面烧伤是造成轴承失效的重要因素之一,而烧伤往往更多地发生于磨削加工中。为了控制轴承套圈磨削加工中的烧伤,保证加工表面质量,本文将针对以上问题,对8Cr4Mo4V钢制轴承套圈磨削烧伤检测及控制技术进行研究。由磨削烧伤造成的轴承失效典型案例,分析了磨削烧伤的烧伤特征、失效模式以及可能出现的典型问题。并通过对酸洗法、显微组织和显微硬度法、磁弹值法等的介绍,为后续应用磨削烧伤检测方法对磨削烧伤的控制研究打下基础。利用传热学基础方程推导出适合套圈磨削加工场合的导热偏微分方程,建立磨削区域温度随磨削热量,工艺参数变化的数学模型。实现根据选取的工艺参数,预测磨削温度是否会导致磨削烧伤,在套圈磨削加工工艺设计时进行磨削温度的预测,实现通过改变磨削加工工艺参数来控制磨削区域的温度,为进一步研究避免套圈烧伤问题产生的磨削烧伤试验提供基础。通过不同工艺参数下的磨削试验,利用不同检验手段对加工后的套圈进行检验分析,得到避免烧伤的最佳工艺参数。总结出适合当前8Cr4Mo4V钢制轴承套圈磨削加工烧伤检验的方法,为之后8Cr4Mo4V钢制轴承套圈磨削烧伤控制的工程化应用打下了研究基础。选用某发动机8Cr4Mo4V钢制三支点轴承套圈进行磨削及检测工程化应用验证,以其轴承套圈沟道磨削加工过程为例采集记录数据,运用统计方法对加工过程进行烧伤控制进行分析,进一步完善应用成果。本文对8Cr4Mo4V钢制轴承套圈表面磨削烧伤检测方法以及轴承套圈磨削加工参数对磨削烧伤的影响,并实际工程化应用的研究,为轴承套圈磨削加工中控制烧伤,保证加工表面质量,从而确保轴承产品的质量,使其更安全、稳定地应用于航空发动机提供了科学参考,具有重要的理论意义和应用价值。更多还原

【Abstract】 8Cr4Mo4V steel bearing is an important component used in the main shaft of aero-engine currently,which affects the normal use of the engine.Burns on the working surface of 8Cr4Mo4 V steel bearing rings are one of the important factors causing bearing failure,and burns often occur during grinding processing.In order to control the burn during the grinding process of the bearing ring and ensure the quality of the processed surface,the dissertation will focuses on thoss issues,researching on grinding burn detection and control technology of 8Cr4Mo4 V ste el bearing rings.First,through the appearance of t ypical cases of bearing failure caused by grinding burns,the burn characteristics,failure modes and typical problems that may occur during use are analyzed.,then pickling method,microstructure and microhardness method,magneto-elastic value method are introduced,which lays the foundation for the follow-up application of four different methods of identifying grinding burns to control grinding burns.Secondly,establish a mathematical model of the temperature that suitable for the grinding of the bearing ring and a method of numerical calculation for this model.The mathematical model has considered the grinding process,grinding parameters and heat distribution of the grinding system,the partial differe ntial equations of thermal conductivity is derived in the grinding process base on thermodynamics equations,predicting the occurrence of thermal damage during the grinding of the bearing ring.Using the mathematical model of the temperature to predict the grinding temperature during the beginning of design process,and the temperature of the grinding area can be controlled by changing the grinding process parameters,which provides the basis for further research on the grinding burn test to avoid the problem of the burn of rings.Thirdly,using grinding tests on rings under different grinding parameters,and using different inspection methods to inspect and analyze the processed rings,the best process parameters to avoid burns are obtained.Summarizes the method that suitable for the current grinding and burn inspection of 8Cr4Mo4 V steel bearing rings,which lays the research foundation for the subsequent engineering application of 8Cr4Mo4 V steel bearing ring grinding and burn control.Finally,a three-pivot bearing ring,which made of 8Cr4Mo4 V,will be selected for grinding and testing engineering application verification.Taking the raceway grinding process of bearing ring raceway grinding process as an example,sampling and recording data,Use statistical methods to analyze the process of burn control and further improve the application results.This dissertation studies the surface grinding burn detection method of8Cr4Mo4 V steel bearing rings and the influence of bearing ring grinding processing parameters on grinding burns,and the practical engineering application,it provides a scientific reference for the control of burns in the grinding process of bearing rings,ensuring the quality of the processed surface,thereby ensuring the quality of bearing products,and making them safer and more stable in the production and operation of aero-engines.It has important theoretical significance and application values.更多还原