微小孔的磨粒流抛光工艺分析与研究

发布时间：2018-06-22 18:18

本文选题：微小孔 + 磨粒流抛光技术　；参考：《长春理工大学》2017年硕士论文

【摘要】：微小孔零件在航天、汽车等高精技术密集的行业中应用越来越广泛,为保证微小孔零件的使用性能,要求微小孔边缘或孔道内壁具有良好的表面质量。传统的抛光技术在加工效率与工艺上存在一定的局限性,而磨粒流抛光技术作为一种超精密流体抛光工艺,因不受零件结构和尺寸限制,现已广泛应用于零件微小孔、窄缝及复杂型腔等结构的抛光。本文基于微小孔结构分析,提取零件几何特征,研究了磨粒流抛光技术对微小孔直管和弯管结构的抛光效果。首先对磨粒流的抛光机理进行研究,在此基础上分析了加工条件、工件特性、磨料介质以及夹具对磨粒流抛光效率和抛光后表面质量的影响。其次利用Fluent软件,对直管和弯管结构进行磨粒流抛光工艺参数数值模拟,得到不同抛光压强、磨料粘度和磨料浓度下流体磨料压强、速度、湍动能以及剪切应力的分布云图,为磨粒流抛光工艺研究提供理论基础。最后使用实验室自主研发的磨粒流研抛设备对直管零件进行抛光实验,得到抛光压强、加工时间、磨料浓度和磨粒粒径对表面粗糙度的影响规律,并确定了P=8MPa,T=120min,D=38μm,C=40%为最佳参数组合,能使直管内壁表面粗糙度从0.983μm降至0.156μm。本文研究所得结论为磨粒流抛光微小孔零件时工艺参数的制定提供参考依据,同时也为磨粒流抛光工艺的应用与发展提供技术支持
[Abstract]:Micro-hole parts are more and more widely used in spaceflight, automobile and other high-precision technology intensive industries. In order to ensure the performance of micro-hole parts, it is required that the micro-hole edge or the inner wall of holes have good surface quality. The traditional polishing technology has some limitations in machining efficiency and technology. As an ultra-precision fluid polishing technology, abrasive flow polishing technology has been widely used in parts with tiny holes because it is not limited by the structure and size of parts. Polishing of narrow slit and complex cavity. In this paper, based on the structure analysis of micro holes, the geometric characteristics of the parts are extracted, and the polishing effect of abrasive flow polishing technology on the structure of straight and curved tubes with tiny holes is studied. Firstly, the polishing mechanism of abrasive flow is studied. On this basis, the effects of processing conditions, workpiece characteristics, abrasive media and fixture on abrasive flow polishing efficiency and surface quality after polishing are analyzed. Secondly, by using fluent software, the abrasive flow polishing process parameters of straight pipe and bend tube structure are simulated, and the distribution of abrasive pressure, velocity, turbulent kinetic energy and shear stress under different polishing pressure, abrasive viscosity and abrasive concentration are obtained. It provides a theoretical basis for the study of abrasive flow polishing technology. Finally, the polishing experiments of straight pipe parts were carried out by using the abrasive flow polishing equipment developed by the laboratory, and the effects of polishing pressure, processing time, abrasive concentration and abrasive particle size on the surface roughness were obtained. The surface roughness of the inner wall of the straight pipe can be reduced from 0.983 渭 m to 0.156 渭 m. The conclusion of this paper provides a reference for the formulation of process parameters for polishing micro-hole parts with abrasive flow, and also provides technical support for the application and development of abrasive flow polishing process.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG580.692

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