镍基高温合金高速高效珩磨技术研究

发布时间：2018-04-29 07:00

本文选题：GH4169 + 高速珩磨　；参考：《南京航空航天大学》2017年硕士论文

【摘要】：珩磨是工具与工件在面接触状态下,以较低的切削速度和压力,对工件切削的加工方法,综合了磨削和研磨的主要特点,在一定程度上可以获得精密磨削的加工效率,同时也可以达到研磨加工的表面质量。但目前普通珩磨技术在航空难加工材料(如镍基高温合金、不锈钢等)孔加工时仍然存在加工效率低,精度和表面质量不易保证等问题。有鉴于此,本文提出采用超硬磨料工具对镍基高温合金GH4169材料孔进行高速珩磨加工,解决航空难加工材料孔精密加工过程的上述难题,以期实现其高效精密加工。本文通过开展立方氮化硼(CBN)珩磨工具高速珩磨GH4169孔数值仿真和试验,分析对材料去除率和表面质量产生影响的主要因素及其影响规律。主要研究工作如下:(1)建立了表面粗糙度数值分析预测模型,获得了珩磨工艺参数对表面粗糙度及表面形貌的影响规律,采用响应曲面法建立了工艺参数优选模型,并进行了试验验证。(2)通过系统的GH4169孔高速珩磨试验,分析主轴转速、往复速度、涨刀行程、涨刀时间对材料去除率的影响规律,获得了影响材料去除率的主要影响因素及其影响规律。(3)通过系统试验分析了工艺参数对表面粗糙度影响的显著程度及其影响规律,通过珩磨孔表面微观形貌、表层微观组织、表层显微硬度及表面残余应力综合评价高速珩磨孔的表面质量。
[Abstract]:Honing is that the cutting method of workpiece is integrated with the main characteristics of grinding and grinding, and the machining efficiency of precision grinding can be obtained to a certain extent under the condition that the tool and workpiece are in contact with each other, with lower cutting speed and pressure, the machining method of workpiece cutting is integrated with the main characteristics of grinding and grinding. At the same time, the surface quality of grinding can be achieved. However, at present, the common honing technology still has some problems such as low processing efficiency, difficult to guarantee precision and surface quality in the hole processing of aviation refractory materials (such as nickel-based superalloy, stainless steel, etc.). In view of this, this paper puts forward to use super hard abrasive tool to honing the high speed honing hole of nickel-based superalloy GH4169 material, so as to solve the problem mentioned above in the precision machining process of aviation difficult material hole, in order to realize its high efficiency precision machining. In this paper, the numerical simulation and experiment of high speed honing GH4169 holes with cubic boron nitride honing tool are carried out, and the main factors affecting the material removal rate and surface quality and their influencing rules are analyzed. The main research work is as follows: (1) the numerical analysis and prediction model of surface roughness is established, the influence of honing parameters on surface roughness and surface morphology is obtained, and the optimization model of process parameters is established by using response surface method. Through the system GH4169 hole high speed honing test, the influence of spindle speed, reciprocating speed, expanding stroke and time on material removal rate is analyzed. The main factors affecting the material removal rate and its influencing rules are obtained. The remarkable degree and the influence law of the process parameters on the surface roughness are analyzed through systematic experiments. The honing hole surface morphology and the surface microstructure are obtained, and the results are as follows: (1) the effect of the process parameters on the surface roughness is analyzed. The surface quality of high speed honing hole is evaluated by surface microhardness and surface residual stress.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG580.67

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