Systems and methods for in-process vision inspection for automated machines

• US 8,668,793 B2
• Filed: 08/11/2005
• Issued: 03/11/2014
• Est. Priority Date: 08/11/2005
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Engelbart, Roger W., Pollock, Timothy, Hannebaum, Reed E.
• Primary Examiner(s): Orlando, Michael
• Assistant Examiner(s): LEE, DANIEL H.
• Application Number:
  US11/202,411
• Publication Number:
  US 20070034313A1
• Time in Patent Office: 3,134 Days
• Field of Search: 165/64, 156/64, 156/378, 156/379
• US Class Current: 156/64
• CPC Class Codes: B29C 70/32 on a rotating mould, former or core
• CPC Class Codes: B29C 70/386 Automated tape laying [ATL]
• CPC Class Codes: B29C 70/541 Positioning reinforcements in a mould, e.g. using clamping means for the reinforcement positioning inserts in moulds B29C33/12; lay-up on a mould B29C70/30
• CPC Class Codes: B29L 2031/3076 Aircrafts blades, propellers B29L2031/08
• CPC Class Codes: B32B 41/00 Arrangements for controlling or monitoring lamination processes; Safety arrangements
• CPC Class Codes: G01N 2021/8472 Investigation of composite materials

Abstract

Systems and methods for in-process vision inspection for automated machines are disclosed. In one embodiment, a head assembly includes a tool moveable over a workpiece and adapted to perform a manufacturing operation on the workpiece, and an inspection unit operatively positioned proximate the tool and moveable with the tool relative to the workpiece. The inspection unit is adapted to perform a vision inspection of a portion of the workpiece simultaneously with the performance of the manufacturing operation on the workpiece. In a particular embodiment, the inspection unit includes a camera adapted to monitor an area including the portion of the workpiece upon which the tool has performed the manufacturing operation, and a processor operatively coupled to the camera and adapted to receive an image from the camera and to analyze the image to determine a presence of a defect within the portion of the workpiece.

Claims

1. A method comprising:

using a tape lamination machine to lay composite tape on a forming tool;

forming lateral stripes on a portion of the tape laid on the forming tool, the lateral stripes extending across a width of the tape laid on the forming tool; and

using a camera to capture images of the lateral stripes; and

processing the images of the stripes to identify any discontinuities in the tape, wherein those stripes intersecting any discontinuities will make those discontinuities apparent.

2. The method of claim 1, wherein a first light source is used to project the stripes onto the portion;

the method further comprising processing the images in real time to detect a discontinuity and using a second light source to project a visual defect identifier onto a detected discontinuity in real time as the tape is being applied and compressed on the forming tool, the visual identifier marking the discontinuity for visual inspection during the tape laying.

3. The method of claim 2, further comprising determining coordinates of detected discontinuities on the tape, wherein the coordinates are used to project the visual identifier on the detected discontinuities.

4. The method of claim 1, wherein the stripes are projected from a tape head of the tape lamination machine;

and wherein position of the stripes along the forming tool is determined.

5. The method of claim 1, wherein a beam from a laser is conditioned into the lateral stripes, and wherein the stripes are projected onto the tape.

6. The method of claim 1, further comprising illuminating the tape during a second mode of operation, generating images of the illuminated tape, and processing the images to detect any bumps, ripples, irregularities, foreign objects and debris.

7. The method of claim 1, wherein the images are acquired at regular intervals that are triggered by an encoder on a placement head of the tape laying machine.

8. The method of claim 1, further comprising acquiring position coordinates of a defect from the tape laying machine and entering position coordinates of a detected defect into an error log.

9. The method of claim 1, wherein the image processing includes using a computer to analyze the lateral stripes in the images to identify any discontinuities without performing edge analysis.

10. The method of claim 9, wherein multiple placement heads are used to apply and compress the tows, and dedicated image analysis and discontinuity detection are performed for each placement head.