针对强韧性材料铣磨、小孔磨削等工艺中,因磨削速度低所引起的磨削表面粗糙度不易改善的问题,提出采用轴向超声振动辅助磨削工艺进行加工的方法。从几何层面对轴向超声振动辅助磨削表面创成进行理论分析,并对9Cr18马氏体不锈钢开展磨削试验,对比了轴向超声振动辅助磨削与普通磨削条件下的磨削表面粗糙度及表面形貌。结果表明,轴向超声振动辅助磨削可有效改善磨削表面粗糙度,且改善效果受磨削参数的影响,其中磨削速度对轴向超声振动效果影响最大,进给速度及磨削深度影响相对较小。磨削速度及磨削深度的增加对轴向超声振动效果具有弱化作用;增大进给速度,轴向超声振动效果略有增强。
Abstract
An axial ultrasonic assisted grinding (AUAG) method was proposed to overcome the problems existing in milling grinding and small-hole grinding process of strong and tough materials, such as poor surface roughness caused by low grinding speed.Firstly, the ground surface generation in AUAG was investigated with a geometric analysis method.Then a series of AUAG and conventional grinding (CG) tests were carried out on 9Cr18 stainless steel.The ground surface roughness and surface topography of CG and AUAG was compared.The results showed that axial ultrasonic vibration (AUV) could improve ground surface roughness effectively and the effectiveness of AUV was influenced by the grinding parameters.The most influential factor on AUV effectiveness was grinding speed, followed by grinding depth and feed rate.The effectiveness of AUV was weakened with the increase of grinding speed and grinding depth.However, when feed rate increased, the effectiveness of AUV was slightly enhanced.
关键词
表面粗糙度 /
轴向超声振动 /
磨削速度 /
磨削深度 /
进给速度
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Key words
surface roughness /
axial ultrasonic vibration /
grinding speed /
grinding depth /
feed rate
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脚注
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