SUS304不锈钢套内圆表面磁力研磨加工研究

Study on Magnetic Abrasive Finishing Inner Circular Surface of SUS304 Stainless Steel Sleeve

使用自制的环形磁刷工具配合多轴运动电解复合磁力研磨机,对SUS304不锈钢套内圆表面进行磁力研磨加工试验,探讨氧化铝磨粒粒径、加工时间、加工负荷以及加工电流对表面粗糙度的影响。结果表明:在纯磨粒磁力研磨试验中,当磨粒粒径为3μm、加工负荷为2 N及振动频率为4 Hz时,研磨加工10 min后,R_(max)=0.198μm、R_(a)=0.045μm,而在纯电解磁力研磨试验中,在负荷2 N与加工电流200 mA的加工条件下,研磨10 min后,R_(max)=0.292μm、R_(a)=0.069μm,较纯磨粒磁力研磨效果稍差;在电解复合磨粒的磁力研磨中,当磨粒粒径为3μm、加工负荷为2 N、振动频率为4 Hz及加工电流为200 mA时,可获得最理想的研磨结果,加工10 min后,R_(max)=0.146μm、R_(a)=0.033μm,效果优于纯磨粒和电解的磁力研磨;在工具无进给的两阶段电解复合磁力研磨试验中,先使用3μm粒径的磨粒、2 N的加工负荷、4 Hz的振动频率以及200 mA的加工电流,研磨4 min,随后更换粒径为1μm的磨粒,研磨12 min后,R_(max)=0.112μm、R_(a)=0.024μm,此时工件内表面已被加工成镜面。

A self-made annular magnetic brush tool joined a multi-axis motion electrolysis composite magnetic abrasive grinding machine was used to carry out magnetic abrasive processing tests on the inner surface of SUS304 stainless steel sleeve.The effects of alumina abrasive particle,processing time,processing load and processing current on surface roughness were investigated.The results show that in the pure abrasive magnetic grinding test,when the abrasive particle size is 3μm,the processing load is 2 N and the vibration frequency is 4 Hz,after grinding for 10 min,the R_(max)=0.198μm and R_(a)=0.045μm;however,in the pure electrolysis magnetic grinding test,the R_(max)=0.292μm and R_(a)=0.069μm after grinding for 10 min under the conditions of 2 N load and 200 mA processing current,which is slightly worse than that of pure abrasive particles;in the electrolysis composite abrasive magnetic grinding,when the grinding particle size is 3μm,the processing load is 2 N,the vibration frequency is 4 Hz and the processing current is 200 mA,the most ideal grinding results can be obtained,after 10 min,R_(max)=0.146μm,R_(a)=0.033μm,the effect is better than those of pure abrasive magnetic grinding and the pure electrolysis magnetic grinding;in the two-stage electrolysis composite abrasive magnetic grinding test without tool feed,the abrasive particle with particle size of 3μm,processing load of 2 N,vibration frequency of 4 Hz and processing current of 200 mA are firstly used for grinding for 4 min,and then the abrasive particle with particle size of 1μm replaces for grinding 12 min,the surface roughness of the workpiece is reduced to R_(max)=0.112μm and R_(a)=0.024μm,the inner surface of the workpiece has been machined into a mirror.