Development of magnetic field assisted machining process using magnetic machining jig

Conventional magnetic abrasives have been used in magnetic field assisted machining process for internal precise finishing. However, it is difficult to machine internal surface of large diameter or thick container, joint of circular pipe and gas bomb head. In this paper, a kind of new magnetic field-assisted machining process using magnetic machining jig was proposed. The magnetic machining jig consisting of steel or permanent magnet wrapped with abrasive paper, as a tool instead of the magnetic abrasives. In contrast to the magnetic field-assisted machining process, the magnetic machining jig can generate higher magnetic force than magnetic abrasives because of higher material susceptibility, achieving the higher finishing efficiency. The advantage of using magnetic machining jig was clarified. Then, a kind of new machining jig used a pair of magnets was proposed, the high efficient machining and stability was realized. Moreover, the model experiments are completed and the possibility of internal surface machining for thick container is confirmed. The processing principle and the machining characteristics were discussed.