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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Mechanical Engineering     
Simulations and experiments on finishing process of screw surface by using abrasive flow machining
GAO Hang,FU You zhi,WANG Xuan ping,PENG Can
Key Laboratory for Precision and Nontraditional Machining Technology of Ministry of Education,Dalian University of Technology, Dalian 116024, China
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Abstract  

Abrasive flow machining (AFM) was proposed to finish screw surface aiming at the problem of high capital cost and undefined surface quality on the finishing process of complex screw surface made of difficulttocut materials. The optimal fixture which is able to obtain uniform screw surface finish was selected based on the contrastive analyses of flow field distributions in two kinds of "fixturescrew" simulation models with and without helical guide blocks. On the basis, contrast tests were carried out to study the screw surface finish by using AFM and belt grinding process, and the research results show that the static pressure of abrasive media decreases along its flow direction, and the contour line of static pressure is along the width direction of screw surface; the backflow in the inlet/outlet regions is eliminated with helical guide blocks, namely, the uniformity of flow field is improved. After AFM process, the screw surface roughness value decreases from 10.5 μm to 0.45 μm, the minimum diameter of screw surface is basically constant, and the screw surface quality and processing efficiency by using AFM process are better than that of manual belt grinding.

Published: 14 January 2017
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GAO Hang,FU You zhi,WANG Xuan ping,PENG Can. Simulations and experiments on finishing process of screw surface by using abrasive flow machining. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(5): 920-926.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008973X.2016.05.015     OR     http://www.zjujournals.com/eng/Y2016/V50/I5/920


螺旋面磨料流光整加工仿真与试验

 针对难加工复杂螺旋面光整加工成本高及质量难保证等问题,提出基于磨料流加工技术的螺旋面光整加工方法. 通过建立有无螺旋引流段的“夹具螺杆”仿真模型,对比分析2种模型中螺旋面磨料介质流场分布规律,优选出适用于螺旋面均匀化光整加工的夹具结构,在此基础上开展挤压螺杆的磨料流加工与砂带磨削对比试验. 结果表明：磨料介质静压力沿流动方向逐渐减小,且等值线近似沿螺旋槽宽度方向分布；增加螺旋引流段后螺旋面进出口回流区被消除,提高流场均匀性；磨料流加工后螺旋表面粗糙度由105 μm降为045 μm,螺旋槽最小直径一致性好,且加工质量和效率优于人工砂带磨削.

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