TOOL PATH DISPLAY APPARATUS FOR MACHINE TOOL

• US 20110015877A1
• Filed: 06/23/2010
• Published: 01/20/2011
• Est. Priority Date: 07/14/2009
• Status: Active Grant

• Current Assignee: Fanuc Ltd (Fanuc Corporation)
• Original Assignee: Fanuc Ltd (Fanuc Corporation)
• Inventors: SUGIYAMA, Kazuyuki, TEZUKA, Junichi, KAWAMURA, Hiroyuki, OKITA, Tadashi
• Granted Patent: US 8,010,302 B2
• Time in Patent Office: Days
• US Class Current: 702/41
• 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 2219/35349 Display part, programmed locus and tool path, traject, dynamic locus

Abstract

First and second screens are set for a tool path display apparatus for displaying a path of the tip of a tool attached to a machine tool. The first screen displays the three-dimensional path of the tip of the tool obtained by synthesizing the position information of the drive axes of a 5-axis machine tool. The second screen displays the waveforms of the position deviations and current instructions of the drive axes in chronological order. When a part (line segment) of the three-dimensional path of the tip of the tool is selected on the first screen, the display attribute of the corresponding time area is changed on the second screen so that the time area can be identified.

Claims

1. A tool path display apparatus for displaying a path of a tip of a tool attached to a machine tool, positions and attitudes of the tool and a workpiece machined by the tool being controlled by a plurality of drive axes including a rotation axis, the tool path display apparatus comprising:

data acquisition means for concurrently acquiring and storing position information, speed information, acceleration information, position deviation information, and a torque command of each of the drive axes at each time moment, as time-series data;

tool path calculation means for calculating three-dimensional coordinates of the tip of the tool with respect to a coordinate system fixed to the workpiece using the position information of each of the drive axes at each time moment and structure information of the machine tool and obtaining the three-dimensional path of the tip of the tool;

display means for displaying, as a time-series waveform, at least one of the three-dimensional path of the tip of the tool obtained by the tool path calculation means and the time-series data obtained by the data acquisition means;

tool path selection means for selecting any part of the three-dimensional path of the tip of the tool displayed by the display means; and

first display attribute change means for changing a display attribute of the part of the three-dimensional path of the tip of the tool selected by the tool path selection means and the time-series waveform in a time area in which position information underlying the three-dimensional coordinates that corresponds to the part of three-dimensional path is obtained.

2. The tool path display apparatus according to claim 1, further comprising time axis selection means for selecting any part of a time axis of the time-series waveform displayed by the display means and second display attribute change means for changing a display attribute of the time-series waveform corresponding to the part of the time axis selected by the time axis selection means and the three-dimensional path of the tip of the tool corresponding to the part of the time axis selected by the time axis selection means.

3. The tool path display apparatus according to claim 2, further comprising first threshold setting means for setting a threshold to be compared with at least one of the position deviation and the torque command of each of the drive axes, wherein when at least one of the position deviation and the torque command exceeds the threshold, the time axis selection means selects a preset time range including a time moment at which the threshold is exceeded.

4. The tool path display apparatus according to claim 2, further comprising position deviation calculation means for multiplying a position deviation of the rotation axis by a rotation radius, which is a distance between a rotation center axis of the rotation axis and the tip of the tool, to calculate a second position deviation and second threshold setting means for setting a second threshold to be compared with the second position deviation calculated by the position deviation calculation means, wherein when the second position deviation exceeds the second threshold, the time axis selection means selects a preset time range including a time moment at which the second threshold is exceeded.

5. The tool path display apparatus according to claim 2, further comprising position deviation synthetic value calculation means for calculating a three-dimensional position deviation vector at the tip of the tool using the position information, the position deviation, and the machine structure information of each of the drive axes at each time moment and calculating the length of the calculated three-dimensional position deviation vector as a position deviation synthetic value and third threshold setting means for setting a third threshold to be compared with the position deviation synthetic value calculated by the position deviation synthetic value calculation means, wherein when the third position deviation exceeds the third threshold, the time axis selection means selects a preset time range including the time moment at which the third threshold is exceeded.

6. The tool path display apparatus according to claim 2, further comprising gravity load calculation means for calculating a load torque by gravity applied to each of the drive axes using preset information of gravity applied to the drive axis, the machine structure information, and position information of each of the drive axes at each time moment, torque command calculation means for obtaining a second torque command by subtracting the load torque by gravity from the torque command, and fourth threshold setting means for setting a fourth threshold to be compared with the second torque command calculated by the torque command calculation means, wherein when the second torque command exceeds the fourth threshold, the time axis selection means selects a preset time range including a time moment at which the fourth threshold is exceeded.

7. The tool path display apparatus according to claim 2, further comprising synthetic value calculation means for calculating a synthetic speed vector or a synthetic acceleration vector at the tip of the tool using the position information and the machine structure information of each of the drive axes at each time moment and calculates a length of the calculated vector as a synthetic speed or synthetic acceleration and fifth threshold setting means for setting a fifth threshold to be compared with the synthetic speed or the synthetic acceleration calculated by the synthetic value calculation means, wherein when the synthetic speed or the synthetic acceleration exceeds the fifth threshold, the time axis selection means selects a preset time range including a time moment at which the fifth threshold is exceeded.

8. A tool path display apparatus for displaying a path of a tip of a tool attached to a machine tool, positions and attitudes of the tool and a workpiece machined by the tool being controlled by a plurality of drive axes including a rotation axis, the tool path display apparatus comprising:

data acquisition means for concurrently acquiring and storing position information, speed information, acceleration information, position deviation information, and a torque command of each of the drive axes at each time moment, as time-series data;

tool path calculation means for calculating three-dimensional coordinates of the tip of the tool with respect to a coordinate system fixed to the workpiece using the position information of each of the drive axes at each time moment and structure information of the machine tool and obtaining the three-dimensional path of the tip of the tool;

display means for displaying, as a time-series waveform, at least one of the three-dimensional path of the tip of the tool obtained by the tool path calculation means and the time-series data obtained by the data acquisition means;

time axis selection means for selecting any part of a time axis of a time-series waveform displayed by the display means; and

display attribute change means for changing a display attribute of the time-series waveform corresponding to the part of the time axis selected by the time axis selection means and the three-dimensional path of the tip of the tool corresponding to the part of the time axis selected by time axis selection means.

9. The tool path display apparatus according to claim 8, further comprising first threshold setting means for setting a threshold to be compared with at least one of the position deviation and the torque command of each of the drive axes, wherein when at least one of the position deviation and the torque command exceeds the threshold, the time axis selection means selects a preset time range including a time moment at which the threshold is exceeded.

10. The tool path display apparatus according to claim 8, further comprising position deviation calculation means for multiplying a position deviation of the rotation axis by a rotation radius, which is a distance between a rotation center axis of the rotation axis and the tip of the tool, to calculate a second position deviation and second threshold setting means for setting a second threshold to be compared with the second position deviation calculated by the position deviation calculation means, wherein when the second position deviation exceeds the second threshold, the time axis selection means selects a preset time range including a time moment at which the second threshold is exceeded.

11. The tool path display apparatus according to claim 8, further comprising position deviation synthetic value calculation means for calculating a three-dimensional position deviation vector at the tip of the tool using the position information, the position deviation, and the machine structure information of each of the drive axes at each time moment and calculating the length of the calculated three-dimensional position deviation vector as a position deviation synthetic value and third threshold setting means for setting a third threshold to be compared with the position deviation synthetic value calculated by the position deviation synthetic value calculation means, wherein when the third position deviation exceeds the third threshold, the time axis selection means selects a preset time range including the time moment at which the third threshold is exceeded.

12. The tool path display apparatus according to claim 8, further comprising gravity load calculation means for calculating a load torque by gravity applied to each of the drive axes using preset information of gravity applied to the drive axis, the machine structure information, and position information of each of the drive axes at each time moment, torque command calculation means for obtaining a second torque command by subtracting the load torque by gravity from the torque command, and fourth threshold setting means for setting a fourth threshold to be compared with the second torque command calculated by the torque command calculation means, wherein when the second torque command exceeds the fourth threshold, the time axis selection means selects a preset time range including a time moment at which the fourth threshold is exceeded.

13. The tool path display apparatus according to claim 8, further comprising synthetic value calculation means for calculating a synthetic speed vector or a synthetic acceleration vector at the tip of the tool using the position information and the machine structure information of each of the drive axes at each time moment and calculates a length of the calculated vector as a synthetic speed or synthetic acceleration and fifth threshold setting means for setting a fifth threshold to be compared with the synthetic speed or the synthetic acceleration calculated by the synthetic value calculation means, wherein when the synthetic speed or the synthetic acceleration exceeds the fifth threshold, the time axis selection means selects a preset time range including a time moment at which the fifth threshold is exceeded.