Numerical controller for continuous cutting control

Patent metadata

Field	Value
Publication number	US-11106194-B2
Application number	US-202016815425-A
Country	US
Kind code	B2
Filing date	Mar 11, 2020
Priority date	Apr 3, 2019
Publication date	Aug 31, 2021
Grant date	Aug 31, 2021

Abstract

A numerical controller configured for simultaneous control such as to cut a workpiece in order in the direction of a rotary axis by a plurality of tools, in a machine having a plurality of cutter holders fitted individually with the tools and capable of lathe turning, generates movement command data for locating the plurality of tools so as to cut the workpiece with the same depth of cut and controlling respective relative speeds and relative positions of the plurality of tools so that respective cutting points of the tools move back and forth in order; generates interpolation data based on the movement command data; and controls a motor for driving the machine, based on the interpolation data.

First claim

The invention claimed is:

1. A numerical controller configured for simultaneous chip breaking and continuous cutting control such as to cut a workpiece in order in the direction of a rotary axis by a plurality of tools, in a machine having a plurality of cutter holders fitted individually with the tools and capable of lathe turning, the numerical controller comprising:
an analyzer configured to generate movement command data for locating the plurality of tools so as to cut the workpiece with the same depth of cut and controlling respective relative speeds and relative positions of the plurality of tools so that respective cutting points of the tools move back and forth with respect to one another based upon the relative speeds of the tools, wherein:
a feed speed of a first tool is different than a feed speed of a second tool, during the continuous cutting of the workpiece,
the first tool is non-cutting when the feed speed of the first tool is less than the feed speed of the second tool, and the second tool is non-cutting when the feed speed of the second tool is less than the speed fee of the first tool, and
a direction of cutting of the workpiece is the same for each of the tools;
an interpolator configured to generate interpolation data based on the movement command data; and
a servo controller configured to control a motor for driving the machine, based on the interpolation data.

2. The numerical controller according to claim 1 , wherein the analyzer generates movement command data such that the respective relative speeds and relative positions of the plurality of tools are controlled so that the respective cutting points of the tools move back and forth in order when a preset condition is satisfied, and the condition is a cutting distance, time or the rotational frequency of a spindle.

3. The numerical controller according to claim 1 , wherein the analyzer generates movement command data such that the respective relative speeds and relative positions of the plurality of tools are controlled so that the respective cutting points of the tools move back and forth in order when a preset condition is satisfied, and the condition is when a preset threshold is exceeded by the amplitude value of a vibration detected by a vibration sensor or the load value of a servomotor.

Assignees

• Fanuc Corp

Inventors

• Miyake Masahiko

Classifications

• G05B19/182

  characterised by the machine tool function, e.g. thread cutting, cam making, tool direction control (G05B19/21 - G05B19/40 take precedence) · CPC title

• G05B19/4103 Primary

  Digital interpolation · CPC title

• B23Q15/14

  Control or regulation of the orientation of the tool with respect to the work · CPC title

• G05B19/4141

  characterised by a controller or microprocessor per axis · CPC title

• B23Q15/08 Primary

  Control or regulation of cutting velocity (B23Q15/12 takes precedence) · CPC title