摘要
目的解决传统磁粒研磨中管件内部磁性磨粒聚拢和更新不充分等问题。方法设计了交变电磁场辅助磁粒研磨试验装置,在保障管件内部磁感应强度的同时,施加交变电磁场促进磁性磨粒的时刻更新,提升研磨效果。确定最佳电流波形,使用变压器与功率放大器提高电磁铁功率。在研磨时间为15min、进给速度为5 mm/s、加工间隙为1.5 mm的条件下,使用响应曲面法对试验参数进行优化,并在此参数条件下对h65黄铜管加工后,使用超景深3D电子显微镜和表面粗糙度测量仪(JB-8E)对管件内表面进行检测。响应面中3种因素对表面粗糙度的影响程度为占空比>电压幅度>频率,最佳试验工艺参数组合为电压幅度6.854 V、频率3.515 Hz、占空比20.195%。原始表面的横向拉伸纹理、微裂纹以及凹点等均被去除,试件内表面粗糙度值Ra从0.525μm下降到0.056μm,与预测值0.064μm的误差仅为12.5%。结论交变电磁场辅助磁粒研磨可以充分使磁性磨粒进行翻滚,从而提高磨料的使用寿命和研磨效果。响应曲面法对研磨工艺参数优化是有效的。
As an advanced machining method,compared with traditional machining technologies,magnetic particle lapping finishing has the advantages of high-precision surface treatment,little damage to the workpiece surface,good self-sharpening and high degree of automation.Therefore,it is suitable for treating the outer surface of the workpiece and the inner hole of the complex-shaped workpiece.This technology removes scratches and defects on the workpiece surface through magnetic particles moving along the magnetic inductance line under the action of the magnetic field,while generating uniform friction and grinding force.It is widely used in the surface treatment of high-precision mechanical parts,such as the surface treatment of aerospace,automotive industry,electronic equipment and medical device parts,to improve the surface quality and safety of use.In order to solve the problems such as the gathering or insufficient updating of magnetic particles inside the pipe fittings in traditional magnetic particle grinding,an alternating electromagnetic field assisted magnetic particle grinding device was designed to ensure the magnetic induction intensity inside the pipe fittings,and an alternating electromagnetic field was applied to promote the constant updating of magnetic particles and improve the grinding effect.With h65 brass pipe as the processing object,the waveform of the current through the electromagnet was changed by the signal generator,and the current waveform most suitable for the grinding of pipe fitting was triangular wave.The transformer and power amplifier were used to multiply the power of the electromagnet.Under the conditions of grinding time of 15 min,feed speed of 5 mm/s and machining gap of 1.5 mm,the response surface method was used to optimize the test parameters.The model had good precision and high precision.The effect degree of the three factors on the surface roughness was duty ratio>voltage amplitude>frequency.Through the multiple regression equation,the surface and contour maps of the effect of pairwise interaction between different factors on the response value were obtained.The effect of interaction of any two factors on the response value was obtained by the control variable method.Finally,the optimal experimental parameters were obtained,the optimal test process parameter combination was voltage amplitude 6.854 V,frequency 3.515 Hz and duty ratio 20.195%.After machining under these parameters,the inner surface of the pipe fittings was detected by ultra-depth of field 3D electron microscope and stylus surface roughness measuring instrument.The transverse tensile texture,micro-cracks and concave points of the original surface were removed,and the surface roughness of the brass pipe was reduced from the original Ra 0.525μm to Ra 0.056μm and the error from the predicted value of 0.064μm was only 12.5%.Response surface analysis can reflect the effect of voltage amplitude(A),frequency(B)and duty cycle(C)on the surface roughness.Magnetic particle grinding technology is suitable for the inner surface machining of h65 brass.The machining of h65 brass pipe with optimal parameters can effectively eliminate the surface defects of the workpiece and reduce the surface roughness of the workpiece.The alternating electromagnetic field assisted magnetic particle grinding device can effectively promote the time renewal of magnetic abrasive particles and improve the grinding effect.
作者
刘冰洋
闫宇航
丁云龙
韩冰
陈燕
LIU Bingyang;YAN Yuhang;DING Yunlong;HAN Bing;CHEN Yan(School of Mechanical Engineering and Automation,University of Science and Technology Liaoning,Liaoning Anshan 114051,China;Liaoning Key Laboratory of Special Machining for Complex Workpiece Surface,University of Science and Technology Liaoning,Liaoning Anshan 114051,China)
出处
《表面技术》
北大核心
2025年第12期152-163,206,共13页
Surface Technology
基金
辽宁省教育厅科学研究经费项目(LJ212410146074)
辽宁省科技厅博士启动基金(2021-BS-241)。
关键词
磁粒研磨
磁性磨粒
交变电磁场
响应曲面法
参数优化
表面粗糙度
magnetic abrasive grinding
magnetic abrasive particle
alternating electromagnetic field
response surface methodology
parameter optimization
surface roughness
