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Date of Publication:2022-10-06

Journal:浙江大学学报 工学版

Affiliation of Author(s):机械工程学院

Issue:5

Page Number:920-926

ISSN No.:1008-973X

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. © 2016, Zhejiang University Press. All right reserved.

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