【作者】 孙杨；

【导师】 巩亚东；

【作者基本信息】 东北大学 ， 机械工程（专业学位）， 2015， 硕士

【摘要】 目前,随着产品小型化的需求越来越高,微小型单晶零件及零件的微小特征具有广阔的应用前景。而单晶材料相对于多晶材料具有很好的高温性能及力学性能分散性最小等特点,被广泛应用于高温工作环境中。微磨削作为微型机械加工的最后一道工序,磨削后的表面质量直接影响到零件的使用寿命和力学性能,同时单晶材料不同于多晶材料,单晶仅有一个晶粒,没有晶界存在,这使得单晶材料的微磨削不同于多晶材料。而镍基高温合金类属于典型的难加工材料,因此,本文对单晶、多晶类镍基高温合金微磨削进行了深入的理论与实验研究,其主要研究内容包括:(1)介绍了单晶材料与多晶材料的不同,根据材料的实际应用情况,研究微磨削对单晶材料加工的影响,提出本文的主要研究内容和研究目的。(2)分析单晶材料的组织结构和断裂机理,确定单晶材料的滑移面;针对微磨削建立了表面粗糙度的理论模型,将磨粒的突出高度视为瑞利分布,而建立磨削力的理论模型。(3)通过对实验方案的设计和实验结果的分析,确定镍基高温合金获得良好表面粗糙度的最优微磨削工艺参数组合和影响的主次顺序,进一步分析各微磨削工艺参数对镍基高温合金表面粗糙度和磨削力的影响规律。(4)建立镍基单晶高温合金微磨削表面粗糙度预测模型,确定微磨削工艺参数对镍基单晶高温合金表面粗糙度的影响顺序和最优参数组合,对不同的微磨削工艺参数,分别从磨削力、表面粗糙度方面结合理论分析,总结对镍基单晶高温合金的影响规律,针对单晶材料发生再结晶的现象进行实验分析,归纳影响再结晶的因素、各磨削参数对再结晶的影响和抑制再结晶的措施。(5)对全文进行总结,得出主要结论,对后续的研究进行展望并提出几点建议。更多还原

【Abstract】 At present,as the miniaturization of product is demanded popularly,the small single crystal and tiny features of components will have the broad application.And single crystal materials own the higher thermal performance and the least dispersion of mechanical properties than polycrystalline materials,so they are widely applied in high temperature working environment.Micro grinding as the last process of the micro machining process,the surface quality directly affects the service life of the component and mechanical property after grinding,at the same time single crystal material differs from polycrystalline material,single crystal only owns a grain,there is no grain boundary in it,which makes the micro grinding of single crystal differs from polycrystalline material.And nickel based superalloy belongs to the typical materials that was machined differently,therefore,in this paper,making a deep micro grinding theoretical and experimental research about single crystal and polycrystalline nickel based superalloy,the main research contents include:(1)Introduced the difference of single crystal and polycrystalline material,according to the practical applied condition of material,to study the grinding to single crystal material,proposed the main content and research purpose of this subject.(2)Analyzed the organizational structure and fractured mechanism of single crystal material,to determine the slip plane of single crystal material;to establish the surface roughness theoretical model of micro grinding.Making the prominent height of grinding grain as Rayleigh Distribution,and established the theoretical model of grinding force.(3)Through the design of experimental schemes and analysis of experimental results,make sure the most optimal combination and primary and secondary order of influencing in grinding parameters;further analyzed the influencing law to surface roughness of grinding and grinding force in nickel based superalloy.(4)Established a grinding surface roughness prediction model of nickel based single crystal material.Make sure the most optimal combination and primary and secondary order of influencing in grinding parameters of nickel based single crystal grinding surface roughness,to different grinding parameters,to summarized the influencing law of nickel based single crystal superalloy from the aspects of grinding force and surface roughness,that combine the theoretical analysis.For recrystallization phenomenon of single crystal material analyzing the experiment,summarized the influencing factors of recrystallization,the effects of grinding parameters on the recrystallization and inhibit recrystallization measures.(5)To summarize the paper and get the conclusion,put forward some suggestions for follow-up studies.更多还原