| 摘要 |
In a wire-cut electric discharge machine the accurate thickness of a workpiece is obtained, on the basis of which electric cutting conditions are automatically changed over. The workpiece and a wire electrode are moved relative to each other through utilization of a servo feed system to cut the workpiece by discharge into a desired shape. Cutting current detecting means detects a true cutting current which contributes to electric discharge machining, and feed rate detecting circuitry detects the relative feed rate of the workpiece and the wire electrode. Thickness detecting circuitry detects the thickness of the workpiece by calculation on the basis of the detected true cutting current and the width of a cutting groove separately input. Control circuitry automatically changes over the electric cutting conditions on the basis of the detection result by the thickness detecting circuitry. |
