Multi-axis processing machine and rotation center measurement method of multi-axis processing machine

Patent metadata

Field	Value
Publication number	US-11480939-B2
Application number	US-202117197052-A
Country	US
Kind code	B2
Filing date	Mar 10, 2021
Priority date	Apr 15, 2020
Publication date	Oct 25, 2022
Grant date	Oct 25, 2022

Abstract

The disclosure is a rotation center measurement method of a multi-axis processing machine which relatively moves tables on which a work piece is placed and a tool for processing the work piece by control of rotation axes based on a processing program, and the rotation center measurement method is characterized to include: a processing program acquisition step in which the processing program is acquired; a processing program analysis step in which command angles of tool postures are read from the processing program and analyzed, and measurement angles are calculated based on the analysis results; and a geometric deviation measurement step in which a reference sphere is placed on the tables and the tables and the tool are relatively moved to measure a position of the reference sphere, and directions and positions of rotation centers of the rotation axes are calculated.

First claim

What is claimed is:

1. A rotation center measurement method of multi-axis processing machine comprising:
a processing program acquisition step in which a processing program configured by a plurality of processing blocks is acquired;
a processing program analysis step in which command angles of tool postures are read from the processing program and analyzed, and measurement angles are calculated based on the analysis results; and
a geometric deviation measurement step in which tables on which a reference sphere is placed and a tool for processing a work piece are relatively moved to measure a position of the reference sphere using the calculated measurement angles, and directions and positions of rotation centers of rotation axes of the multi-axis processing machine are calculated.

2. The rotation center measurement method of multi-axis processing machine according to claim 1 , wherein in the processing program analysis step, frequency distributions of the command angles are calculated, and the command angles having a high appearance frequency are used as the measurement angles.

3. The rotation center measurement method of multi-axis processing machine according to claim 2 , wherein in the processing program analysis step, the command angles whose appearance frequency exceeds a predetermined threshold value are calculated from the frequency distributions, and a lower limit value, an upper limit value, and a median value among the command angles whose appearance frequency exceeds a predetermined threshold value are used as the measurement angles.

4. A multi-axis processing machine which relatively moves tables and a tool, comprising:
the tables on which a work piece is placed; the tool for processing the work piece; servo motors which are arranged on the tables and the tool; an overall control unit which drives the servo motors; and a numeric value control unit which calculates directions and positions of rotation centers of rotation axes of the multi-axis processing machine, wherein
the numeric value control unit comprises:
a processing program acquisition unit which acquires the processing program;
a processing program analysis unit which reads command angles of tool postures from the processing program and analyzes the command angles, and calculates measurement angles based on the analysis results; and
a geometric deviation measurement unit which relatively moves the tables on which a reference sphere is placed and the tool to measure a position of the reference sphere using the calculated measurement angles, and calculates directions and positions of the rotation centers.

Assignees

• Sodick Co Ltd

Inventors

• Kawasaki Michihisa
• Yokota Shoya
• Ambai Munetaka

Classifications

• B23Q15/12 Primary

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

• G05B2219/50062

  Measure deviation of workpiece under working conditions, machine correction · CPC title

• G05B19/404 Primary

  characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia (G05B19/19, G05B19/41 take precedence) · CPC title