Numerical controller
A numerical controller has a tool retraction function for retracting a tool so as not to damage the machined surface of a workpiece when machining of the workpiece by a machine tool is interrupted. The numerical controller identifies a machining method for the machining to be interrupted when a command to interrupt the machining is detected, determines the direction of the retraction of the tool, based on the identified machining method and the feed direction and the rotation direction of a spindle in the machining to be interrupted, and generates a movement path of the tool in the determined retraction direction.
1. A numerical controller controlling a machine tool which includes a spindle and at least two feed axes for relatively moving the spindle and a workpiece and machines the workpiece by rotating a tool mounted on the spindle in accordance with a machining program,
wherein the numerical controller is configured to retract the tool from the workpiece with currently performed machining interrupted, based on a command to interrupt the machining while the workpiece is being machined,
and wherein the numerical controller comprises:
a processor configured to:
detect the command to interrupt the machining;
identify a machining method for the machining to be interrupted when the command to interrupt the machining is detected; and
determine a direction of the retraction of the tool, based on the identified machining method, a cutting feed direction, and rotation direction of the spindle in the machining to be interrupted, and to generate a movement path of the tool in the determined direction of retraction for the tool.
2. The numerical controller according to claim 1 , wherein the machining method is either down-cut or up-cut.
3. A numerical controller controlling a machine tool which includes a spindle and at least two feed axes for relatively moving the spindle and a workpiece and machines the workpiece by rotating a tool mounted on the spindle in accordance with a machining program,
wherein the numerical controller is configured to retract the tool from the workpiece with currently performed machining interrupted, based on a command to interrupt the machining while the workpiece is being machined,
and wherein the numerical controller comprises:
a processor configured to:
detect the command to interrupt the machining;
identify a machining method for the machining to be interrupted when the command to interrupt the machining is detected;
determine a direction of the retraction of the tool, based on the identified machining method, a cutting feed direction, and a rotation direction of the spindle in the machining to be interrupted, and to generate a movement path of the tool in the determined direction of retraction for the tool;
assume, in a case where the machining method is down-cut, a leftward direction relative to the feed direction of the spindle to be the tool retraction direction when the rotation direction of the spindle is clockwise as viewed from a base of the spindle, or assume a rightward direction relative to the spindle feed direction to be the tool retraction direction when the spindle rotation direction is counterclockwise; and
assume, in a case where the machining method is up-cut, the rightward direction relative to the spindle feed direction to be the tool retraction direction when the spindle rotation direction is clockwise as viewed from the base of the spindle or assume the leftward direction relative to the spindle feed direction to be the tool retraction direction when the spindle rotation direction is counterclockwise.