Method of compensating profile data, and numerical controller and machine tool for practicing the method

  • US 6,721,622 B2
  • Filed: 09/16/2002
  • Issued: 04/13/2004
  • Est. Priority Date: 09/14/2001
  • Status: Active Grant
First Claim
Patent Images

1. A method of compensating a profile data used in a numerical controller of a machine tool for machining a workpiece by numerically controlling a work spindle and a tool feed axis in accordance with said profile data which define rotational angles of said work spindle for rotating said workpiece as an object to be machined and feed amounts or positions of said tool feed axis for displacing a tool to machine said workpiece in synchronism with the rotational angle of said work spindle, said method comprising:

  • an effective profile data generating step of generating an effective profile data based upon effective data which are obtained by numerically controlling said work spindle and said tool feed axis in accordance with theoretical profile data geometrically obtained based upon finished shape data of said workpiece under a non-load condition that said tool feed axis is off-set relative to said workpiece by at least a machining amount so as not to actually machine said workpiece being set up on said work spindle, and by actually detecting rotational angles of said work spindle and said feed amounts or positions of said tool feed axis;

    a first error profile data generating step of generating first error profile data corresponding to the differences between said effective profile data and said theoretical profile data under said non-load condition, said first error profile data including error components in a system of said numerical controller;

    a first compensated profile data generating step of generating first compensated profile data by compensating said theoretical profile data for said first error profile data;

    a measured profile data generating step of generating measured profile data based upon measured lift data which are obtained by numerically controlling said work spindle and said tool feed axis in accordance with said first compensated profile data to actually machine said workpiece with said tool and by measuring the shape of said workpiece actually machined;

    a second error profile data generating step of generating second error profile data corresponding to the differences between said measured profile data and said first compensated profile data, said second error profile data including mechanical error components in said machine tool; and

    a second compensated profile data generating step of generating second compensated profile data by compensating said first compensated profile data for said second error profile data or by compensating said theoretical profile data for said first error profile data and said second error profile data.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×