Abrasing apparatus using magnetic abrasive powder

Claim 1

An abrasing apparatus using magnetic abrasive powder comprising: an exciting coil which is wound on an outer periphery of a core disposed between an upper yoke and a lower yoke and is fixedly mounted on a base; a barrel including an inner plate disposed around an outer periphery of said exciting coil in spaced relationship with the outer periphery, a bottom plate, a cover defining an outer periphery of said barrel and an upper opening to form annular space in which magnetic abrasive powder is filled, said barrel being rotated about a rotational axis by a motor along an outside of said exciting coil on the base; a bottom magnetic pole which is fixedly mounted to said bottom plate of said barrel and includes a surface in which magnetic members and non-magnetic members are alternately disposed along a rotational direction of the rotational axis of said barrel; a lateral magnetic pole which is fixedly mounted to said inner plate and includes a surface in which magnetic members and non-magnetic members are alternately disposed along the rotational direction of the rotational axis of said barrel; an upper magnetic pole which is fixedly mounted to said inner plate of said barrel so that said upper magnetic pole is disposed above said lateral magnetic pole and includes magnetic members and non-magnetic members which are alternately disposed along the rotational direction of the rotational axis of said barrel in a surface opposed to said surface of said bottom magnetic pole in spaced relationship with said surface of said bottom magnetic pole; and a spindle inserted into said barrel from upside thereof and including a lower end having a chuck for holding a work of which side portion is disposed within abrasion space surrounded by said bottom magnetic pole, said lateral magnetic pole and said upper magnetic pole, said spindle being rotated by a motor provided on said barrel.