In order to explain the removal mechanism of abrasive cutting materials under ultrasonic action,the single grain grinding process was analyzed,and the mathematical model of undeformed cutting thickness and the fixed velocity ratio(vs/vw)of abrasive and workpiece was established.The single grain tests of conventional grinding(CG),tangential ultrasonic vibration assisted grinding(TUVAG)and radial ultrasonic vibration assisted grinding(RUVAG)with a fixed speed ratio were carried out on AISI 304 specimens.The results showed that the specimens are removed by plastic deformation under the action of CG and TUVAG at the fixed speed ratio,but the ultrasound significantly improves the material removal rate.The material removal method of the specimen under RUVAG was closely related to the value of the maximum undeformed cutting thickness agmax.When agmax is less than 0.8 μm,the specimen was removed in the form of brittle fracture.After that,with the increase of agmax,the specimen was removed in the form of plastic deformation.
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