Multi-function powerful electromagnetic chucks have a powerful magnetic up to 15-24 kg/c.Its structure has the special function for collecting spread magnetic line of force in the chuck space and has a capacity of attraction and holding workpieces on the surface of chucks.According to the shape of workpieces,different position of grinding surface can be selected and special workpiece position aslo can be realized by adopting magnetic conduction element.Especially it is suitable for processing dies.