Method for drilling holes according to an optimized sequence

• US 8,362,392 B2
• Filed: 02/05/2008
• Issued: 01/29/2013
• Est. Priority Date: 02/05/2008
• Status: Active Grant

• Current Assignee: Pratt & Whitney Canada Corporation (Rtx Corporation)
• Original Assignee: Pratt & Whitney Canada Corporation (Rtx Corporation)
• Inventors: Elfizy, Amr
• Primary Examiner(s): Yuen, Henry
• Assistant Examiner(s): WASAFF, JOHN SAMUEL
• Application Number:
  US12/026,152
• Publication Number:
  US 20090196699A1
• Time in Patent Office: 1,820 Days
• Field of Search: 219/121.6, 21912167-12172, 219/121.79, 700/173, 700/159, 700/160, 700/162, 700/166, 700/182, 408/1.R, 408/3
• US Class Current: 219/121.71
• CPC Class Codes: B23K 26/0823 Devices involving rotation of the workpiece
• CPC Class Codes: B23K 26/382 by boring
• CPC Class Codes: B25J 9/1664 characterised by motion, path, trajectory planning
• CPC Class Codes: G05B 2219/45139 Laser drilling
• CPC Class Codes: G05B 2219/49378 Tool path finding, select minimal distance
• CPC Class Codes: Y10T 408/03 Processes
• CPC Class Codes: Y10T 408/08 with means to regulate operation by use of templet, tape, card, or other replaceable information supply

Abstract

A method for drilling holes in a component according to an optimized sequence is provided. The sequence is determined so as to minimize a total displacement of all axes of a hole drilling machine that is required for moving between each hole in the sequence.

Claims

1. A method for drilling holes in a component using a hole drilling machine, the hole drilling machine having a plurality of machine axes wherein at least one axis is a rotary axis, the method comprising the steps of:

a) providing a hole pattern comprising a plurality of holes with respective locations and directional vectors, the directional vectors defining axes along which the holes extend;

b) determining a drilling sequence for the hole pattern based on the location and directional vector of each hole and on a configuration of the hole drilling machine so as to minimize a total displacement in all machine axes required for moving between each hole, by;

i) calculating a position of each machine axis required for drilling each hole,

ii)selecting a first one of the holes as a current hole;

ii) selecting a next one of the holes among remaining ones of the holes corresponding to a shortest total displacement between the position of each machine axis for the current hole and the position of each machine axis for the next one of the holes, the total displacement between the position of each machine axis for the current hole and the position of each machine axis for the next one of the holes is calculated as √

{square root over (dX²+dY²+dZ²+dθ

A²+dθ

C²)}, where dX, DY and dZ correspond to a linear displacement along a respective one of three near machine axes, and dθ

A and dθ

C correspond to a rotary displacement around a respective one of two rotary machine axes;

iii) replacing the current hole with the next one of the holes; and

iv) repeating step ii) and iii) until all holes are selected; and

c) drilling the holes according to the drilling sequence.

2. The method as defined in claim 1, wherein the hole drilling machine comprises a pulsed laser system.

3. The method as defined in claim 2, wherein a movement between consecutive holes occurs during an interval between two consecutive pulses while the laser system is continuously firing and a shutter of the laser system is open.

4. The method as defined in claim 3, wherein the movement between consecutive holes is continuous while the laser system delivers a single pulse to each hole.

5. The method as defined in claim 4, wherein the drilling sequence is repeated to deliver a required number of pulses to each hole.

6. The method as defined in claim 2, further comprising grouping the holes of the sequence into a plurality of zones.

7. The method as defined in claim 6, wherein a movement between consecutive holes within individual zones occurs during an interval between two consecutive pulses while the laser system is continuously firing and a shutter of the laser system is open.

8. The method as defined in claim 7, wherein the movement between consecutive holes within individual zones is continuous while the laser system delivers a single pulse to each hole.

9. The method as defined in claim 8, wherein at least one zone of the sequence is repeated to deliver a required number of pulses to each hole within the at least one zone.

10. A method for drilling holes in a component using a multi-axis hole drilling machine having at least one rotary axis, the method comprising the steps of:

a) providing a hole pattern comprising a plurality of holes with respective locations and directional vectors, the directional vectors defining axes along which the holes extend;

b) based on the location and directional vector of each hole and kinematics of the multi-axis hole drilling machine, determining a drilling sequence for the hole pattern so as to minimize a total displacement in all axes of the drilling machine required for moving between consecutive holes by;

i) calculating a position of each axis of the drilling machine required for drilling each hole,

ii) selecting a first one of the holes as a current hole,

iii) selecting a next one of the holes among remaining ones of the holes corresponding to a shortest total displacement between the position of each axis of the drilling machine for the current hole and the position of each axis of the drilling machine for the next one of the holes,

iii) replacing the current hole with the next one of the holes, and

iv) repeating steps ii) and iii)until all holes are selected; and

c) drilling the holes using the multi-axis hole drilling machine according to the drilling sequence.

11. The method as defined in claim 10, wherein the hole drilling machine comprises a pulsed laser system.

12. The method as defined in claim 11, wherein a movement between consecutive holes occurs during an interval between two consecutive pulses while the laser system is continuously firing and a shutter of the laser system is open.

13. The method as defined in claim 12, wherein the movement between consecutive holes is continuous while the laser system delivers a single pulse to each hole.

14. The method as defined in claim 13, wherein the drilling sequence is repeated to deliver a required number of pulses to each hole.

15. The method as defined in claim 11, further comprising grouping the holes of the sequence into a plurality of zones.

16. The method as defined in claim 10, wherein the total displacement between the position of each axis of the drilling machine for the current hole and the position of each axis of the drilling machine for the next one of the holes is calculated as √

{square root over (dX²+dY²+dZ²+dθ

A²+dθ

C²)}, where dX, DY and dZ correspond to a linear displacement along a respective one of three linear machine axes, and dθ

A and dθ

C correspond to a rotary displacement around a respective one of two rotary machine axes.