| 摘要 |
<p>A method and a device for numerical control capable of performing extremely accurate processing even when the blade tip of a cutting tool is offset from the center of a shaft to which a cutting tool is fitted when a groove with a specified cross section is cut in a work by using the cutting tool having the blade tip matching the shape of the groove to be cut, wherein the position of the blade tip of the cutting tool with reference to the centerline of the rotatable shaft is pre-inputted as tool offset information, the point of the blade tip is used as a reference point for a program moving instruction based on the tool offset information, the correction amount of the blade tip angle of the cutting tool fitted to the rotatable shaft and a correction amount due to the offset of the cutting tool for moving, about a blade tip point, the front face of a cutter to a next moving instruction end point are obtained based on a vector from a present position to the next moving instruction end point, and based on these correction amounts, the rotatable shaft is rotated and X- and Y-axes are moved to control the attitude of the cutter for facing, about the blade tip point, the front face of the cutter toward the next moving instruction end point before the moving instruction is executed.</p> |
