Controlling operation of a machining tool
AssigneeMakino Milling Machine Co., Ltd.
InventorsKazunari Ishii, Takehito Shinada
Life of this patent
Estimating the term…
Abstract
Provided is a control method for a machining tool that processes a workpiece while causing a tool, which rotates by means of a main shaft motor, and the workpiece, which is secured to a table, to move relative to one another, wherein on the basis of the torque command value, the current command value, or the actual current value of the main shaft motor, calculated is the actual cutting force of the tool that is received from the workpiece at a location which is predetermined during the processing of the workpiece, and the actual cutting force that has been calculated is displayed on a display unit.
Claims4
A control method for a machine tool for machining a workpiece while causing relative movement between a tool rotated by a spindle motor and the workpiece fixed to a table, comprising:
- calculating an actual cutting force received from the workpiece at a predetermined position of the tool during machining of the workpiece based on a torque command value, a current command value, or an actual current value of the spindle motor, wherein the actual cutting force acts in a radial direction of the tool;
- displaying the calculated actual cutting force on a display part;
- calculating a first allowable cutting force for the tool that is allowed to be applied to the tool at the predetermined position of the tool, wherein the first allowable cutting force relates to damage of the tool;
- calculating a second allowable cutting force for a bearing that is allowed to be applied to the bearing at the predetermined position of the tool, wherein the second allowable cutting force relates to damage of the bearing in a spindle device;
- determining a determination value based on the smallest allowable cutting force among the first allowable cutting force for the tool and the second allowable cutting force for the bearing;
- and
- reducing a relative speed of the tool with respect to the workpiece when the calculated actual cutting force exceeds the determination value.
A control apparatus for a machine tool for machining a workpiece while causing relative movement between a tool rotated by a spindle motor and the workpiece fixed to a table, comprising:
- a cutting force calculation part that calculates an actual cutting force received from the workpiece at a predetermined position of the tool during machining of the workpiece, based on a torque command value, a current command value, or an actual current value of the spindle motor, wherein the actual cutting force acts in a radial direction of the tool;
- a display part that displays the calculated actual cutting force;
- and
- a cutting force control part that:
- calculates a first allowable cutting force for the tool that is allowed to be applied to the tool at the predetermined position of the tool, wherein the first allowable cutting force relates to damage of the tool;
- calculates a second allowable cutting force for a bearing that is allowed to be applied to the bearing at the predetermined position of the tool, wherein the second allowable cutting force relates to damage of the bearing in a spindle device;
- determine a determination value based on the smallest allowable cutting force among the first allowable cutting force for the tool and the second allowable cutting force for the bearing;
- and
- reduces a relative speed of the tool with respect to the workpiece when the calculated actual cutting force exceeds the determination value.
Dependencies are inferred from the claim text.