Multi-axis machine tool and methods of controlling the same

Patent metadata

Field	Value
Publication number	US-10654141-B2
Application number	US-201815966615-A
Country	US
Kind code	B2
Filing date	Apr 30, 2018
Priority date	Jun 22, 2015
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

One embodiment of the present invention can be characterized as a method for controlling a multi-axis machine tool that includes obtaining a preliminary rotary actuator command (wherein the rotary actuator command has frequency content exceeding a bandwidth of a rotary actuator), generating a processed rotary actuator command based, at least in part, on the preliminary rotary actuator command, the processed rotary actuator command having frequency content within a bandwidth of the rotary actuator and generating a first linear actuator command and a second linear actuator command based, at least in part, on the processed rotary actuator command. The processed rotary actuator command can be output to the rotary actuator, the first linear actuator command can be output to a first linear actuator and the second linear actuator command can be output to a second linear actuator.

First claim

What is claimed is:

1. A method for controlling a multi-axis machine tool configured to process a workpiece using a tool, the multi-axis machine tool comprising a rotary actuator configured to impart relative movement between the tool and the workpiece about a first axis, a first linear actuator configured to impart relative movement between the tool and the workpiece along a second axis, a second linear actuator configured to impart relative movement between the tool and the workpiece along a third axis, and a controller operatively coupled to the rotary actuator, the first linear actuator and the second linear actuator, the method comprising:
receiving, at the controller, a preliminary rotary actuator command, the preliminary rotary actuator command having frequency content exceeding a bandwidth of the rotary actuator; and
at the controller:
generating a processed rotary actuator command based, at least in part, on the preliminary rotary actuator command, the processed rotary actuator command having frequency content within the bandwidth of the rotary actuator;
generating a first linear actuator command and a second linear actuator command based, at least in part, on the processed rotary actuator command;
outputting the processed rotary actuator command to the rotary actuator;
outputting the first linear actuator command to the first linear actuator; and
outputting the second linear actuator command to the second linear actuator.

2. The method of claim 1 , wherein the second axis is orthogonal to the first axis.

3. The method of claim 1 , wherein the third axis is orthogonal to the second axis.

4. The method of claim 1 , wherein generating the processed rotary actuator command comprises filtering the preliminary rotary actuator command.

5. The method of claim 1 , wherein generating the first linear actuator command and the second linear actuator command comprises:
generating a set of intermediate linear actuator commands based on the preliminary rotary actuator command and at least one preliminary linear actuator command; and
processing the set of intermediate linear actuator commands based, at least in part, on the processed rotary actuator command.

6. The method of claim 1 , further comprising processing the workpiece with the tool while imparting relative movement about the first axis.

7. The method of claim 6 , wherein processing the workpiece with the tool comprises directing laser light to the workpiece.

8. A multi-axis machine tool, comprising:
a tool configured to process a workpiece;
a first rotary actuator configured to impart relative movement between the tool and the workpiece about a first axis;
a first linear actuator configured to impart relative movement between the tool and the workpiece along a second axis;
a second linear actuator configured to impart relative movement between the tool and the workpiece along a third axis; and
a controller operatively coupled to the first rotary actuator, the first linear actuator and the second linear actuator, the controller configured to:
receive a preliminary rotary actuator command, the preliminary rotary actuator command having frequency content exceeding a bandwidth of the rotary actuator;
generate a processed rotary actuator command based, at least in part, on the received preliminary rotary actuator command, the processed rotary actuator command having frequency content within a bandwidth of the rotary actuator;
generate a first linear actuator command and a second linear actuator command based, at least in part, on the processed rotary actuator command;
output the processed rotary actuator command to the rotary actuator;
output the first linear actuator command to the first linear actuator; and
output the second linear actuator command to the second linear actuator.

9. The multi-axis machine tool of claim 8 , further comprising a second rotary actuator configured to impart relative movement between the tool and the workpiece about the first axis, wherein a bandwidth of the second rotary actuator is higher than a bandwidth of the first rotary actuator.

10. The multi-axis machine tool of claim 8 , further comprising a third linear actuator configured to impart relative movement between the tool and the workpiece along at least one selected from the group consisting of the first axis, the second axis and the third axis.

11. The multi-axis machine tool of claim 8 , wherein the tool includes a waterjet.

12. The multi-axis machine tool of claim 8 , further comprising a laser source and the tool includes a focused beam of laser light.

13. The multi-axis machine tool of claim 12 , further comprising a third linear actuator configured to impart relative movement between the tool and the workpiece along at least one selected from the group consisting of the first axis and the second axis.

14. The multi-axis machine tool of claim 12 , further comprising a third linear actuator configured to impart relative movement between a beam waist of the focused beam of laser light and the workpiece along a propagation path in which the beam of laser light propagates.

15. The multi-axis machine tool of claim 14 , wherein the third linear actuator includes at least one selected from the group consisting of an acousto-optic deflector (AOD) system, a microelectromechanical systems (MEMS) mirror system and an adaptive optical (AO) system.

16. A multi-axis machine tool, comprising:
a laser source configured to generate a beam of laser light;
a tool tip positioning assembly including a scan lens configured to focus the beam of laser light thereby producing a focused beam of laser light having a beam waist, wherein the tool tip positioning assembly further includes at least one actuator to move the scan lens along at least one axis and at least one positioner arranged between the laser source and the scan lens, wherein the at least one positioner is operative to move the beam waist along at least one axis, wherein the tool tip positioning assembly includes at least one selected from the group consisting of an acousto-optic deflector (AOD) system, a microelectromechanical systems (MEMS) mirror system and an adaptive optical (AO) system;
a workpiece positioning assembly configured to position the workpiece in a path along which the focused beam of laser light is propagatable, wherein the workpiece positioning assembly is further operative to rotate the workpiece about at least one axis and translate the workpiece along at least one axis; and
a controller operatively coupled to the laser source, the workpiece positioning assembly, and the tool tip positioning assembly and configured to control an operation of the laser source, the workpiece positioning assembly, and the tool tip positioning assembly.

17. The multi-axis machine tool of claim 16 , wherein the at least one positioner is operative to translate the beam waist along at least one axis.

18. The multi-axis machine tool of claim 16 , wherein the at least one positioner is operative to rotate the beam waist about at least one axis.

19. The multi-axis machine tool of claim 1 , wherein the at least one positioner includes an AOD system.

20. The multi-axis machine tool of claim 19 , wherein the AOD system includes:
a first AOD system operative to diffract the beam of laser light along a first axis; and
a second AOD system operative to diffract the beam of laser light along a second axis orthogonal to the first axis.

21. The multi-axis machine tool of claim 20 , wherein the AOD syste

Assignees

• Electro Scient Ind Inc

Inventors

• Lu Guang
• Alpay Mehmet E
• Tyler Mike
• Xu Qian
• Kleinert Jan
• Lin Zhibin
• Brookhyser James D
• Lo Ho Wai
• Eaton Kurt M

Classifications

• B23Q15/14 Primary

  Control or regulation of the orientation of the tool with respect to the work · CPC title

• B23Q15/00

  Automatic control or regulation of feed movement, cutting velocity or position of tool or work · CPC title

• G05B19/402

  characterised by control arrangements for positioning, e.g. centring a tool relative to a hole in the workpiece, additional detection means to correct position (G05B19/19 takes precedence) · CPC title

• G05B2219/50218

  Synchronize groups of axis, spindles · CPC title

• G05B2219/41196

  Adaptive prefiltering · CPC title