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滚动轴承滚道磨削表面形貌及变质层研究
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摘要
高性能滚动轴承是重大装备及精密装备的核心部件,高速、重载、高精度滚动轴承的自主研发能力落后,已成为严重制约我国装备制造业快速发展的瓶颈。全面提升轴承的设计和制造水平、改进制造工艺已成为轴承行业亟待解决的问题。滚动轴承滚道作为轴承的工作表面,其表面质量及尺寸精度将直接影响到轴承的工作性能和使用寿命。轴承滚道磨削工艺作为关键制造工序之一,磨削过程在轴承滚道表层产生的不良影响将延续到轴承成品,影响轴承的工作性能。磨削过程作为高比能的加工工艺过程,去除单位体积的材料需要更高的能量投入,由高比能转化产生的高温对工件材料的影响是很难避免的。因此,选择合理的磨削参数,尽可能降低磨削过程对滚道表面质量所带来的负面影响,是提升磨削工艺水平的关键问题。本文以磨削表面形貌和磨削变质层为研究对象,以磨削弧区中磨粒与工件材料的微观相互作用为切入点,建立了磨削参数与磨削表面粗糙度、磨削变质层厚度之间的数值关系,搭建了轴承滚道磨削实验平台并进行了实验研究,结合理论研究提出了综合考虑粗糙度、变质层厚度及加工效率的轴承滚道磨削工艺参数规划方法,对进一步提升轴承滚道磨削工艺具有一定的理论意义和实用价值。本文主要研究工作如下:
     (1)对磨削弧区中磨粒与工件材料微观作用机理进行了深入分析研究,建立了相关数学模型。基于磨粒粒度服从正态分布、位置服从随机分布,给出了砂轮单位体积磨粒数量的计算方法。将磨削弧区重新定义为“磨削弧长×磨削宽度×最大未变形切屑厚度”的空间区域,认为磨粒在经过磨削弧区时,经历了未接触、滑擦、耕犁和切削四个阶段。分析得到了这四个阶段各自的起始位置及长度与磨粒直径、磨粒突起高度和磨粒位置之间的数学关系。通过求解由微观上推导出的切削磨粒所去除材料的总体积,等于宏观上的比去除率的方程得到最大未变形切屑厚度。通过对磨粒在磨削弧区内各阶段的分析,得到满足磨削弧区内各类磨粒的磨粒直径、磨粒突起高度和磨粒位置这三个变量的积分区间,从而得到了磨削弧区内各类磨粒的数量。将磨削弧区离散,在每一区间内计算各类磨粒数量,得到各类磨粒在磨削弧区中的分布。理论分析及实例计算结果表明,未接触磨粒数量占磨粒总数量的一半且沿磨削弧长减少,滑擦磨粒在整个磨削弧区中都存在且沿磨削弧长增加,耕犁及切削磨粒在磨削弧区中的某一位置处才开始出现。对磨削弧区微观作用机理的分析研究为本文后续工作奠定了理论基础。
     (2)建立了考虑砂轮修整和磨损影响的磨削表面形貌模型,得到磨削参数与磨削表面粗糙度之间的数值关系。在工件表面定义轮廓线LA,描述表面形貌,认为砂轮表面的磨粒依次经过并改变轮廓线的形状。根据磨粒突起高度、磨粒直径以及磨粒位置和磨粒切入深度之间的数学关系,同时考虑了磨粒粒度、磨粒位置的分布特性,确定了经过轮廓线的磨粒的直径、磨粒在工件表面法向和磨削宽度方向上的位置。所有磨粒经过后,得到了磨削表面形貌LA*及粗糙度Ra。将理论计算结果与相关文献实验数据进行对比,验证了理论模型,分析了磨削参数对磨削表面粗糙度的影响。考虑砂轮修整和磨损的影响,建立了砂轮修整磨损轮廓线Ldw,得到了考虑修整和磨损影响的磨削表面形貌及粗糙度模型。当磨粒经过轮廓线LA之前,被修整磨损轮廓线Ldw改变其形状,将修整和磨损的影响带入到磨削表面形貌中。进行了修整导程单因素磨削实验,将理论计算结果与实验数据进行对比,验证了理论模型,分析了修整参数对磨削表面粗糙度的影响。将平面磨削参数等价转换为轴承滚道磨削参数,将相关理论应用于轴承滚道磨削过程中,得到了轴承滚道磨削参数与表面粗糙度之间的数值关系。结果表明,轴承滚道磨削表面粗糙度只与精磨阶段的磨削参数相关,精磨阶段磨削深度较小,滚道粗糙度受工件转速的影响较大。基于修整参数与表面粗糙度之间的数值关系,可评价修整导程及修整深度的合理性,基于磨削参数与表面粗糙度之间的数值关系,可选择满足磨削工艺粗糙度要求的工件转速。
     (3)建立了磨削参数与磨削暗层厚度之间的数值关系,提出了考虑暗层厚度、粗糙度和加工效率的轴承滚道磨削参数规划,分析了磨削白层的产生机理。建立了单颗磨粒磨削力模型,结合各类磨粒数量在磨削弧区的分布,得到了总热流密度在磨削弧区的分布。在磨削弧区各区间内计算热量分配比,得到了传入工件的热流密度的分布。建立有限元模型,将传入工件的热流密度加载,计算得到了磨削温度场。基于磨削温度场内工件表层各点的温度变化历程,得到了磨削暗层的厚度。将磨削暗层的计算方法应用于轴承滚道磨削过程中,得到了磨削参数对轴承滚道磨削暗层厚度的影响规律。结果表明,轴承滚道磨削暗层厚度受磨削深度的影响较大。基于磨削参数对轴承滚道磨削粗糙度和磨削暗层厚度的影响规律,提出了综合考虑磨削粗糙度、变质层厚度和加工时间的磨削工艺参数规划的方法。根据本方法得到的轴承滚道磨削工艺参数,既可满足工艺对粗糙度的要求,还可保证不产生磨削暗层,同时加工效率也是最高的。基于单颗磨粒切削的有限元模拟,分析了磨削白层的产生机理,结果表明,当磨削弧区总体温升低于工件材料相变温度时,由单颗磨粒切削也会产生白层组织,此时白层组织在工件表面的分布是随机和不连续的。
     (4)搭建了角接触球轴承B7008C内圈磨削力及磨削温度实验平台,进行了实验研究。通过测量砂轮电机功率获取切向磨削力,采用改进的顶式热电偶方法测量获取了磨削温度场,在金相显微镜下观察了工件表层的变质层的组织及深度。将测量及理论计算数据进行了对比,结果表明理论计算结果吻合良好,其中切向磨削力预测误差小于7%、磨削温度场分布及变化历程、磨削暗层厚度、磨削白层特征均与本文理论预测结果相符合,从而证明了本文理论适用于轴承滚道磨削研究。
High performance bearings are core components of major equipments and precision devices. However, the backwards of independent research and design capabilities of high speed, heavy load and high precision bearing are becoming to be a soft spot of restricting the development of the equipment manufacturing industry in China.comprehensive upgrade the level of bearing's research and design and the level of manufacturing process have already become a key problem which the bearing industry have to face. The raceway surface is working surface of bearings, the surface quality and dimensional accuracy will direct influence on work performance and life of bearings. The raceway grinding process is one of the key manufacturing processes. The influences produced in grinding process on raceway surface quality will extended into bearing products, and further influence the service behavior of bearings. Grinding is a high specific energy process, which need more energy put into removing unit volume materials. Most of the energy invested is transferred into heat and produce high temperature and its influences on material qualities are also hardly avoided.Therefore, in order to obtain the best condition of raceway surface quality and improving grinding technology level, it is a key issue is how to choose a reasonable grinding parameters.In the evaluating indicators of surface qualities, ground surface roughness and heat affected layers are chosen as the key research objects. Take the microscopic interaction mechanism in grinding contact zone as a breakthrough point. The ground surface topography and grinding affected layers were studied both theoretically and experimentally. In the work of this paper, the numerical relationship between grinding parameters and ground surface roughness and thickness of grinding affected layers, was established, which has certain theoretical significance. An experimental platform were built and bearing ring raceway grinding experiments were conducted and a bearing ring raceway grinding process planning method considering roughness, grinding affected layers and grinding efficiency were taken into considered, which has certain practical significance. There are following several contents in the research of this paper.
     (1) A deep research and analysis has been carried out on microscopic interaction mechanism in grinding contact zone and interrelated machematical models were established. Based on the assumptions of grains' size following normal distribution and the grains' location following random distribution, the number of grains in unit grinding wheel volume and maximum undeformed chip thickness have been developed. The grinding contact zone has been redefined to be a space region of "grinding contact length×grinding width×maximum undeformed chip thickness" and there are four stages while a grain experiences contact zone:uncontact, sliding, plowing and cutting. The mathematical relationships between the starting locations&lengths and the sizes, protruding heights, locations of grains, have been analyzed. The maximum undeformed chip thickness was obtained by solving a equation of making the removed material volume from all cutting grains microscopically, equaling with specific removal rate macro scopically. Based on the analysis of these four stages, the integrating ranges of grain size, protrude height and location of each type of grains, and the numbers of each type of grains were obtained. The contace zone were discreted and the numbers of each type of grains in each interval were calculated the the distributions of each type of grains were obtained.Theoretical analysis and calculation results showed that the number of uncontact grains is a half of total grain number and reduces along grinding contact length, sliding grains are existing along whole grinding contact zone and its number is increasing along grinding contact length, plowing and cutting grain are starting occurrence at some place in grinding contact length. The research on the microscopic interaction mechanism has been established an theoretical basis of the following work.
     (2) Models of ground surface topographies and roughness were established considering grinding wheel dressing and wear effects and the mathematical relationship between grinding and dressing paremeters and ground surface roughness was established. Shape line LA was defined on the workpiece surface and describes surface topography. The grains on the wheel surface go through successively and change the shape of LA.Based on the relationship of grain protrude height, size, location and penetration depth, considering the stochasitic nature of grains'distribution, the grain's size, protrude height and locations at normal and width of workpiece surface have been determined. After all the grains passed, the ultimate shape of LA and ground surface roughness Ra, were obtained. Comparison results between calculation and experiment data showed in good agreement. The influence of grinding parameters on ground surface roughness was analyzed. Take the grinding wheel dressing and wear effects into consideration, dressing and wear shape line Ldw was established and the ground surface topographies and roughness considering dressing and wear effects were obtained.Before a grain changes LA, its shape was changed by Ldw. A dressing lead single factor experiment was carried out to validate the models and the influence of dressing parameters on ground surface roughness was analyzed. The relationship between bearing raceway grinding parameters and ground raceway surface roughness then was obtained by applying relative methods. Results showed that, bearing raceway surface roughness only relative with precision grinding stage. Since the grinding depth of precision grinding is small, raceway roughness is affected by bearing ring spin velocity the most. Based on the relationship between dressing parameters and ground surface roughness, the rationality of dressing parameter can be evaluate, and based on the relationship between grinding parameters and ground surface roughness, a set of reasonable grinding parameter can be chosen to satify process requirements on roughness.
     (3) A relationship between grinding paremeters and grinding dark layer thickness has been established. A method of process planning comprehensive considering dark layer thickness, roughness and working efficiency has been proposed. The mechanism of grinding white layer generation has been analyzed. Single plowing and cutting grain forces models were developed. Combining with the distributions of each type of grains on grinding contact zone, the total heat flux distribution was obtained. Combining with the heat partition ratio distribution, the heat flux into workpiece was obtained. An FEM model was developed, the heat flux into workpiece was loaded on the grinding surface and the grinding temperature field and dark layer thickness was obtained. The relationship between bearing raceway grinding parameters and dark layer thickness was then obtained. Results showed that the dark layer thickness was influenced by grinding depth the most. Base on the relationship between grinding paramters and ground surface roughness as well as dark layer thickness, a method of porcess planning comprehensive considering roughness, dark layer thickness and working efficiency, was proposed. Based on a single grain cutting FEM model, the generation mechanism of white layer was analyzed. Results showed that, even though the population temperature in grinding contact zone is not reaching the phase-transition temperature, the white layer can also be emerged bacause single grain cutting. In this situation, the characters of white layer on workpiece surface are random and discontinuous.
     (4) An experimental platform of bearing ring raceway grinding of angular contact ball bearing B7008C inner ring, and a series of experimental research were carried out. The tangential grinding force was obtained by measuring the power of grinding wheel drive motor. The grinding temperatures were obtained by a modified screw type thermocouple method. The metallurgical structure of ground surface material was observed under metalloscope and the thickness of dark layer can be obtained. All of the above measurement data were compared with calculation results which showed in good accordance.
引文
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