Numerical controller for controlling feed speed

Patent metadata

Field	Value
Publication number	US-9429931-B2
Application number	US-201414284430-A
Country	US
Kind code	B2
Filing date	May 22, 2014
Priority date	May 23, 2013
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

A numerical controller obtains a necessary moving distance for the completion of movement in each interpolation period, based on a moving distance for each block and the input ratio of a distance by which movement is completed in each interpolation period to the moving distance for each block. If the obtained moving distance is shorter than the moving distance for each interpolation period based on an initially set feed speed, the feed speed is changed to a speed for moving the moving distance in each interpolation period.

First claim

The invention claimed is:

1. A numerical controller for controlling a path and a feed speed of a tool according to a machining program in which a first feed speed and a moving distance for each block are commanded, the numerical controller comprising:
an input unit configured to input a ratio of a distance by which movement is completed in each interpolation period to a moving distance for each block;
a moving ratio determination unit configured to determine whether the ratio inputted by the input unit is equal to or less than a predetermined ratio of the distance by which a movement is completed in each interpolation period to the moving distance for each block, corresponding to a block shape;
a moving distance calculation unit configured to obtain a necessary distance for the completion of movement in each interpolation period based on the ratio input by the input unit and the moving distance for each block;
a moving distance determination unit configured to determine whether or not the distance calculated by the moving distance calculation unit is shorter than the moving distance for each interpolation period based on the first feed speed;
a moving speed calculation unit configured to calculate, as a second feed speed, a speed for moving, in each interpolation period, the distance obtained by the moving distance calculation unit if it is determined by the moving ratio determination unit that the ratio inputted by the input unit is equal to or less than the predetermined ratio of the distance by which a movement is completed in each interpolation period and it is determined by the moving distance determination unit that the distance calculated by the moving distance calculation unit is shorter than the moving distance for each interpolation period based on the first feed speed;
a commanded speed changing unit configured to change the feed speed to the second feed speed obtained by the moving speed calculation unit; and
a notification unit configured to make notification if the ratio of the distance by which movement is completed in each interpolation period to the moving distance for each block, which is input by the input unit, is higher than that set in advance.

2. A numerical controller for controlling a path and a feed speed of a tool according to a machining program in which a first feed speed and a moving distance for each block are commanded, the numerical controller comprising:
an input unit configured to input a ratio of a distance by which movement is completed in each interpolation period to a moving distance for each block;
a moving distance determination unit configured to determine whether or not the moving distance for each block is shorter than a moving distance for each interpolation period based on the first feed speed;
a moving ratio acquiring unit configured to acquire a predetermined ratio of the distance by which a movement is completed in each interpolation period to the moving distance for each block, corresponding to a block shape;
a moving distance calculation unit configured to obtain a necessary distance for the completion of movement in each interpolation period based on the ratio input by the input unit and the moving distance for each block;
a moving speed calculation unit configured to obtain, as a second feed speed lower than the first feed speed, a speed for each block if it is determined by the moving distance determination unit that the moving distance for each block is shorter than the moving distance for each interpolation period based on the first feed speed;
a commanded speed changing unit configured to change the feed speed to the second feed speed obtained by the moving speed calculation unit; and
a notification unit configured to make notification if the ratio of the distance by which movement is completed in each interpolation period to the moving distance for each block, which is input by the input unit, is higher than the predetermined ratio.

3. The numerical controller according to claim 2 , wherein the moving speed calculation unit obtains, as the second feed speed, a speed for moving the moving distance for each block in each interpolation period.

4. The numerical controller according to claim 2 , wherein the moving speed calculation unit calculates the second feed speed based on the first feed speed and a preset ratio.

5. The numerical controller according to claim 2 , wherein the moving speed calculation unit uses a preset speed as the second feed speed.

Assignees

• Fanuc Corp

Inventors

• Mochida Takeshi

Classifications

• B23Q15/013 Primary

  Control or regulation of feed movement (B23Q15/12 takes precedence) · CPC title

• G05B19/416 Primary

  characterised by control of velocity, acceleration or deceleration (G05B19/19 takes precedence) · CPC title

• B23Q15/12

  Adaptive control, i.e. adjusting itself to have a performance which is optimum according to a preassigned criterion · CPC title

• G05B19/402 Primary

  characterised by control arrangements for positioning, e.g. centring a tool relative to a hole in the workpiece, additional detection means to correct position (G05B19/19 takes precedence) · CPC title

• G05B2219/49001

  Machine tool problems · CPC title