| 摘要 |
<p>This invention provides a large taper machining method using a wire electric discharge machine which can carry out a large taper machining for a taper angle of 20 DEG or larger stably and with high accuracy and can also improve surface smoothness of the workpiece. When electric discharge machining including machining of a large taper with a taper angle of 20 DEG or larger is executed, a wire electrode (5) consisting of a soft electrode wire for discharge machining having a tensile strength of up to 46 kg/mm<2> is used. The wire electrode bent greatly at wire support portions of upper and lower wire guides (8, 12) is thereafter easily transformed into a straight line and forms a linear portion between both wire guides, thereby stabilizing machinability and improving machining accuracy and surface smoothness of the workpiece.</p> |
