Numerical control unit having function to smoothly change feed speed when override is changed
AssigneeFanuc Corporation
InventorIwao MAKINO
Life of this patent
Estimating the term…
Abstract
A commanded speed is acquired by a command program analysis unit, an override is acquired by an override input unit, and the override before input is changed in steps by a stepwise override change unit to the override that is input, in a predesignated time or by a predesignated change amount, and outputs the override changed as an actual override. The actual override is acquired by a speed operation unit in an interpolation cycle from the stepwise override change unit and the commanded speed is multiplied by the actual override to calculate a feed speed.
Claims3
A numerical control unit to control a machine tool that machines work mounted on a table by relatively moving a tool at a feed speed instructed by a machining program, the numerical control unit comprising:
- a command program analysis unit configured to analyze a commanded speed of the machining program;
- an override input unit configured to input an override as a multiplying factor of the commanded speed;
- a stepwise override change unit configured to output the override as an actual override after changing in steps the override before input by the override input unit to the override that is input by a predetermined amount for each interpolation cycle;
- and
- a speed operation unit that calculates the feed speed by multiplying the commanded speed by the actual override.
Dependencies are inferred from the claim text.