US 2003/0120376 A1Published application

Numerical controller

AssigneeFanuc Corporation

InventorsNobuhiro Shibata, Toshiaki Otsuki

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Abstract

A numerical controller capable of precisely controlling a machine tool having an axis for turning a table with a simple machining program and easily coping with variation of a tool length. A machining path is commanded in a workpiece coordinate system turning with a table. The commanded machining path for linear-motion axes is interpolated based on a commanded machining velocity, to obtain interpolated positions on the machining path. Also, the commanded motions for rotational-motion axes are interpolated to obtain interpolated positions for the rotational-motion axes. The interpolated position for the linear-motion axes is corrected based on the interpolated position of the rotational-motion axes. The servomotors for the linear-motion axes are driven based on the corrected interpolated positions and the servomotors for the rotational-motion axes are driven based on the interpolated positions of the rotational-motion axes. Since the workpiece coordinate system turns with the table, a machining shape defined in the workpiece coordinate system is realized on the workpiece turning with table.

Claims12

Dependent claims

A numerical controller for controlling a machine tool having a plurality of linear-motion axes and at least one rotational-motion axis for a table on which a workpiece is mounted, said controller comprising:

motion commanding means for providing a command of motion path for said linear-motion axes, a command of velocity of said tool with respect to said workpiece, and a command of rotational motion of the rotational-motion axis for defining an orientation of said tool with respect to said table;
coordinate system defining means for defining a coordinate system with respect to said table;
first interpolation means for performing interpolation on the commanded motion path using the commanded velocity in said coordinate system to obtain interpolated position data for said linear-motion axes;
second interpolation means for interpolating the rotational motion of said rotational-motion axis based on the commanded motion path and the commanded velocity to obtain interpolated position data for the rotational-motion axis;
and
correction means for correcting the interpolated position data obtained by said first interpolation means based on the interpolated position data for the rotational-motion axis,
wherein motion commands for the linear-motion axes are outputted based on the interpolated position data for the linear-motion axes corrected by said correction means, and motion commands for the rotational-motion axis are outputted based on the interpolated position data for the rotational-motion axis so that a tool center point set to the tool is moved along the commanded motion path at the commanded velocity.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/270,684Filed 16 Oct 2002
Priority: JP 318147/200116 Oct 2001
Published: 26 Jun 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G05B 19/41
Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to…
G05B 2219/50297
Machine tool, machine tool null till machine tool work handling: compensation of positioning error due to a-axis, b-axis tool rotation
Y10T 409/300896
With regulation of operation by templet, card, or other replaceable information supply: with sensing of numerical information and regulation…
Y10T 409/306664
Milling: including means to infeed rotary cutter toward work