Numerical control device

Patent metadata

Field	Value
Publication number	US-2020183364-A1
Application number	US-201916692202-A
Country	US
Kind code	A1
Filing date	Nov 22, 2019
Priority date	Dec 10, 2018
Publication date	Jun 11, 2020
Grant date	—

Abstract

A numerical control device for a machine tool which causes a tool to move along a movement path decided according to a machining program, the numerical control device including: a limit setting storage unit in which limit values of a plurality of parameters related to movement of the tool are set; a limit velocity calculation unit which calculates a plurality of limit velocities, which respectively correspond to the limit values at each position of the movement path; a feedrate determination unit which defines a minimum value among an ideal velocity of the tool and the plurality of limit velocities at each position on the movement path as a feedrate of the tool at each position on the movement path; and a deceleration recording unit which stores a type of the parameter corresponding to a case of the feedrate determination unit defining the limit velocity as the feedrate.

First claim

What is claimed is:

1 . A numerical control device for a machine tool which causes a tool to move along a movement path decided according to a machining program, the numerical control device comprising:
a limit setting storage unit in which limit values of a plurality of parameter related to movement of the tool are set; a limit velocity calculation unit which calculates a plurality of limit velocities which are movement velocities of the tool, which respectively correspond to the limit values of the plurality of parameters at each position of the movement path; a feedrate determination unit which defines a minimum value among an ideal velocity of the tool and the plurality of limit velocities at each position on the movement path as a feedrate of the tool at each position on the movement path; and a deceleration recording unit which stores a type of the parameter corresponding to a case of the feedrate determination unit defining the limit velocity as the feedrate.

2 . The numerical control device according to claim 1 , wherein the deceleration recording unit sums a number of times of the feedrate determination unit defining the limit velocity as the feedrate for each of the parameters.

3 . The numerical control device according to claim 2 , further comprising a count output unit which causes the number of times summed by the deceleration recording unit to be displayed for each of the parameters.

4 . The numerical control device according to claim 1 , further comprising a deceleration factor output unit which outputs a signal according to a type of the parameter corresponding to the limit velocity defined as the feedrate, when the tool passes through a position at which the feedrate determination unit defined the limit velocity as the feedrate.

5 . The numerical control device according to claim 1 , further comprising a trajectory output unit which causes a trajectory of the tool to be displayed,
wherein the trajectory output unit causes a marker in accordance with a type of the parameter corresponding to the limit velocity defined as the feedrate to be displayed at a position at which defining the limit velocity as the feedrate on the trajectory of the tool.

6 . The numerical control device according to claim 1 , further comprising an adjustment effect calculation unit which calculates variation in the time required in order for the tool to move an entirety of the movement path when changing a limit value of the parameter.

7 . The numerical control device according to claim 1 , wherein the plurality of parameters includes instantaneous variation in velocity of each drive axis of the machine tool, and acceleration and jerk of the tool.

Assignees

• Fanuc Corp

Inventors

• Koide Naoya

Classifications

• G05B19/4166 Primary

  Controlling feed or in-feed (G05B19/4163 takes precedence) · CPC title

• G05B2219/43201

  Limit speed to allowable speed for all axis · CPC title

• G05B19/4163 Primary

  Adaptive control of feed or cutting velocity (without NC B23Q15/12) · CPC title

• G05B2219/36521

  Select by combination of detected force, acceleration, speed, work rate · CPC title

• G05B19/4065

  Monitoring tool breakage, life or condition · CPC title