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US 2015/0241868 A1Published application
Numerical controller controlling a laser processing machine
AssigneeFanuc Corporation
InventorTakayoshi MATSUMOTO
Life of this patent
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Abstract
The gap control axis following speed calculating unit of a numerical controller controlling a laser processing machine calculates a gap control axis following speed based on a displacement amount obtained from a separation distance and a reference distance between a nozzle tip and a workpiece, and a gap control gain. A first determining unit determines that the nozzle tip has entered an approach side when the separation distance becomes smaller than the reference distance. A first changing unit changes the gap control gain continuously in accordance with the displacement amount.
Claims5
1:
- A numerical controller controlling a laser processing machine, comprising:
- a reference distance specifying unit configured to specify a reference separation distance between a nozzle tip and a workpiece as a reference distance;
- a gap amount detecting unit configured to detect the separation distance between the nozzle tip and the workpiece;
- a displacement amount calculating unit configured to obtain a displacement amount from the reference distance specified by the reference distance specifying unit and the separation distance detected by the gap amount detecting unit;
- a data storing unit storing a gap control gain;
- a gap control axis following speed calculating unit configured to calculate a gap control axis following speed based on the displacement amount and the gap control gain;
- a first determining unit configured to determine that the nozzle tip has entered an approach side when the separation distance between the nozzle tip and the workpiece becomes smaller than the reference distance;
- and
- a first changing unit configured to change the gap control gain continuously in accordance with the displacement amount when the first determining unit determines that the nozzle tip has entered the approach side, wherein
- the numerical controller of a laser processing machine performs control of the nozzle tip position of the laser processing machine based on the displacement amount.
7 more elements
2:
- The numerical controller controlling a laser processing machine according to claim 1, further comprising:
- a second determining unit configured to determine that emergent abnormal closeness is present when the separation distance between the nozzle tip and the workpiece becomes smaller than an abnormally close distance;
- and
- a second changing unit configured to change a gain using a function that is continuous at the approach side closer to the workpiece than the reference position to a gap control gain for emergency after the second determining unit determines that the emergent abnormal closeness is present.
1 more element
3:
- The numerical controller controlling a laser processing machine according to claim 1, wherein
- the first determining unit is configured to determine that the nozzle tip has returned from the approach side to the reference position, and
- the numerical controller of a laser processing machine further includes a switching unit configured to switch to a normal gap control gain when the first determining unit determines that the nozzle tip has returned to the reference position.
4:
- The numerical controller controlling a laser processing machine according to claim 1, wherein
- the gap control gain for the approach side is a function that is any one of an N-order function with N being a natural number, a trigonometric function, an exponential function, and a logarithmic function and is continuous at the approach side from the reference position.
5:
- The numerical controller controlling a laser processing machine according to claim 2, wherein
- the first determining unit is configured to determine that the nozzle tip has returned from the approach side to the reference position, and
- the numerical controller of a laser processing machine further includes a switching unit configured to switch to a normal gap control gain when the first determining unit determines that the nozzle tip has returned to the reference position.