摘要
Magnetic liquid can produce alternative internal pressure under the alternative high-frequency gradient magnetic field.Because it has higher bulk modulus,the internal pressure results in its volume change.Using piezoelectric transducers,the ultrasonic wave generated by the vibration of magnetic liquids can be detected,which shows that the magnetic liquids have the magnetostrictive effect and can generate the ultrasonic vibration under the alternative magnetic gradient field.Some nonmagnetic abrasives and rust-proofing agents can be mixed into the magnetic liquids,under the alternative magnetic field,the abrasives held by magnetic liquids grind the surface of the workpieces,and thus,the finishing for the surface with complex shape,mold cavity and inner wall of tiny tubes can be realized.
Magnetic liquid can produce alternative internal pressure under the alternative high-frequency gradient magnetic field. Because it has higher bulk modulus, the internal pressure results in its volume change. Using piezoelectric transducers, the ultrasonic wave generated by the vibration of magnetic liquids can be detected, which shows that the magnetic liquids have the magnetostrictive effect and can generate the ultrasonic vibration under the alternative magnetic gradient field. Some nonmagnetic abrasives and rust-proofing agents can be mixed into the magnetic liquids, under the alternative magnetic field, the abrasives held by magnetic liquids grind the surface of the workpieces, and thus, the finishing for the surface with complex shape, mold cavity and inner wall of tiny tubes can be realized.
基金
Sponsored by Zhejiang Province Scientific and Technological Key Task Program (2007C21025)
Ningbo Science and Technological Key Task Program (2007B10010)
