Numerical controller

Patent metadata

Field	Value
Publication number	US-9280150-B2
Application number	US-200913511848-A
Country	US
Kind code	B2
Filing date	Nov 26, 2009
Priority date	Nov 26, 2009
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

A numerical controller obtains a position of each driving shaft of a machine performing determination of a feeding speed, interpolation and coordinate conversion according to a relative instruction path and an instruction speed of a tool tip point relative to a work instructed to a processing program. When determining the feeding speed, a reference point is provided on a tool or a table, a translation speed of the reference point viewed from a mechanical coordinate system is set to an observation target speed, a reference feeding speed is obtained so that the observation target speed is a predetermined reference speed, and the smaller of the reference feeding speed and the instruction feeding speed is set to the feeding speed.

First claim

The invention claimed is:

1. A numerical controller that controls a relative position and a tool posture of a tool relative to a work of a multi-axes machine tool, which includes a translation movement shaft performing a translation movement of the tool relative to the work, and a rotation driving shaft rotating and moving a table with the work placed thereon, based on an instruction path of each driving shaft and an instruction feeding speed of an entire driving shaft combination, the numerical controller comprising:
a feeding speed determination portion which outputs a feeding speed; and
an interpolation portion which obtains an interpolation position of each driving shaft for each control cycle that is moved along the instruction path at the feeding speed,
wherein, when an amount of translation movement of the tool relative to the work is 0 or relatively small, the feeding speed determination portion obtains a maximum allowed feeding speed along the instruction path, without outputting the instruction feeding speed to be instructed by a processing program to the interpolation portion, obtains a reference feeding speed of the entire driving shaft combination so that a translation speed of the tool tip point relative to the work is set to an observation target speed, and among the obtained maximum allowed feeding speed and the obtained reference feeding speed, outputs a smaller feeding speed to the interpolation portion.

2. The numerical controller according to claim 1 ,
wherein the interpolation portion performs the interpolation so that the instruction path is moved in a movement time 0 or a minimum control cycle, when the tool posture relative to the work is a peculiar posture in the instruction path instructed to the processing program, and there is no translation movement of the tool tip point relative to the work.

Assignees

• Sato Tomonori
• Nakamura Naoki
• Tsuda Takeshi
• Ono Shunro
• Mitsubishi Electric Corp

Inventors

• Sato Tomonori
• Nakamura Naoki
• Tsuda Takeshi
• Ono Shunro

Classifications

• G05B2219/43156

  Feed rate · CPC title

• G05B19/4166 Primary

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