Tool trajectory display device having function for displaying inversion position of servo axis

• US 9,423,785 B2
• Filed: 10/09/2013
• Issued: 08/23/2016
• Est. Priority Date: 10/10/2012
• Status: Active Grant

• Current Assignee: Fanuc Corporation
• Original Assignee: Fanuc Corporation
• Inventors: Ogawa, Hajime, Tezuka, Junichi
• Primary Examiner(s): Ali, Mohammad
• Assistant Examiner(s): Karim, Ziaul
• Application Number:
  US14/050,063
• Publication Number:
  US 20140100688A1
• Time in Patent Office: 1,049 Days
• Field of Search: 700180-186, 318/601, 606/130, 702/41, 702/141, 702/152
• US Class Current: 1/1
• CPC Class Codes: G05B 19/404 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 Class Codes: G05B 19/409 characterised by using manual data input [MDI] or by using control panel, e.g. controlling functions with the panel; characterised by control panel details or by setting parameters G05B19/408, G05B19/4093 take precedence
• CPC Class Codes: G05B 2219/36171 Edit velocity, motion profile, graphic plot of speed as function of time, position

Abstract

A tool trajectory display device capable of displaying an inversion position of a servo axis on a tool trajectory. The display device has a position information obtaining part and velocity information obtaining part which obtain position information and velocity information of at least one servo axis, respectively, from numerical controller; a tool coordinate calculating part which calculates a coordinate value of a tool center point based on the position information and information of a mechanical constitution of the machine tool; an inversion position calculating part which calculates an inversion position where a polarity of a velocity of the servo axis is changed, based on the velocity information and the calculated coordinate value; and a displaying part which displays a trajectory of the tool center point based on the calculated coordinate, and displays the inversion position of the servo axis on the trajectory.

Claims

1. A tool trajectory display device for displaying a trajectory of a tool center point of a machine tool with a plurality of servo axes including at least one rotation axis controlled by a numerical controller, the tool trajectory display device comprising:

a position information obtaining part which obtains position information of at least one servo axis of the plurality of servo axes, by using a position detector which measures the position of the at least one servo axis;

a velocity information obtaining part which obtains velocity information of the at least one servo axis, by calculating the velocity information based on the position information obtained by the position information obtaining part or by using a velocity detector which measures a velocity of the at least one servo axis;

a tool coordinate calculating part which calculates a coordinate value of the tool center point based on the position information of the at least one servo axis and information of a mechanical constitution of the machine tool;

an inversion position calculating part which calculates a plurality of inversion positions based on the velocity information of the at least one servo axis and the coordinate value of the tool center point, the plurality of inversion positions including

a first inversion position where a polarity of the velocity of the at least one servo axis is changed from plus to minus, and

a second inversion position where the polarity of the velocity of the at least one servo axis is changed from minus to plus; and

a displaying part which

displays a trajectory of the tool center point based on the coordinate value of the tool center point, and

displays the plurality of inversion positions of the at least one servo axis on the trajectory of the tool center point,

wherein the plurality of servo axes includes a gravity axis, and the displaying part displays the first and second inversion positions by using different display attributes, respectively, to indicate whether a moving direction of the gravity axis is changed from upward to downward or from downward to upward, for evaluating an effect of gravity on a shape error of a workpiece to be processed by the machine tool.

2. The tool trajectory display device as set forth in claim 1, wherein the displaying part simultaneously displays the inversion positions of the plurality of servo axes on the trajectory of the tool center point.

3. The tool trajectory display device as set forth in claim 1, wherein the displaying part changes a display attribute of the trajectory of the tool center point based on the polarity of the velocity of the at least one servo axis.

4. The tool trajectory display device as set forth in claim 1, wherein the displaying part displays an arrow, a sign or a character which represents each of the plurality of inversion positions.