| 摘要 |
PURPOSE:To prevent the lowering of machining accuracy for the part in cutting process by holding and bridging the both parts containing a part having been cut and a part being not yet cut in an object to be machined by equipping permanent magnets. CONSTITUTION:A plurality of holding means 20, 20 keeping permanent magnet 22, 22 on a base plate 3 are equipped and the nozzle 14a for machining liquid is arranged in the center to be opposite to the object to be machined. When oil pressure from an oil pump 25 is switched over by the control from a numerical control device 30, the holding means 20, 20 are expanded against the elasticity of a spring, and the magnets 22, 22 are detached from the holding members 20, 20. Both parts containing a piece having been cut by a wire electrode in the object to be cut and the object proper, are bridged, thereby preventing the bend or fall of the cut piece by the part 27a having been cut. |
