System and method for determining whether an apparatus or an assembly process is acceptable

• US 9,558,547 B2
• Filed: 01/09/2014
• Issued: 01/31/2017
• Est. Priority Date: 01/09/2014
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Alam, Munirul
• Primary Examiner(s): Patel, Jayesh A
• Application Number:
  US14/151,584
• Publication Number:
  US 20150193925A1
• Time in Patent Office: 1,118 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06T 2207/10116 X-ray image
• CPC Class Codes: G06T 2207/30164 Workpiece; Machine component
• CPC Class Codes: G06T 7/001 using an image reference approach

Abstract

An apparatus is scanned to obtain a 3-dimensional image of the apparatus. A 2-dimensional cross-sectional image for a section of the 3-dimensional image is generated using a processor. The 2-dimensional cross-sectional image is compared with the processor to a preferred 2-dimensional cross-sectional image or to preferred dimensions for the 2-dimensional cross-sectional image. The processor determines if the apparatus or the process for making the apparatus is acceptable based on the comparison.

Claims

1. A method for determining whether an assembly process is acceptable, comprising:

X-Ray scanning an assembly to obtain 2-dimensional image data of the assembly;

generating a 3-dimensional image of the assembly using a processor and a geometry processing tool, wherein the geometry processing tool comprises a computer tomography application;

generating, using the processor, a 2-dimensional cross-sectional image for a section of the 3-dimensional image, wherein the section of the 3-dimensional image of the assembly is selected to correspond to digital model assembly data which includes nominal dimensions and tolerances for one or more features of the assembly;

comparing with the processor the 2-dimensional cross-sectional image to the digital model assembly data; and

determining with the processor a process capability index based on the nominal dimensions and the tolerances to determine that the assembly process is acceptable if the process capability index is above a pre-determined threshold or that the assembly process is unacceptable if the process capability index is below the predetermined threshold.

2. The method of claim 1 wherein the comparing with the processor the 2-dimensional cross-sectional image comprises overlaying the 2-dimensional cross-sectional image with a preferred 2-dimensional cross-sectional image.

3. The method of claim 1 further comprising modifying a method of manufacturing the assembly if the assembly process is determined to be unacceptable so that the modified manufacturing method produces an acceptable assembly process.

10. The method of claim 1, further comprising using the processor to communicate corrective action instructions to an output device for modifying the assembly process upon determining that the assembly process is unacceptable.

4. A system for determining whether an assembly process is acceptable, comprising:

an X-Ray imaging device configured to acquire 2-dimensional image data of an assembly;

a processor in electronic communication with the X-Ray imaging device;

a memory in electronic communication with the processor, wherein the memory comprises a computer tomography application executable by the processor to generate a 3-dimensional image of the assembly based on the 2-dimensional image data from the X-Ray imaging device, and programming code executable by the processor to generate a 2-dimensional cross-sectional image for a section of the 3-dimensional image of the assembly, wherein the section of the 3-dimensional image of the assembly is selected to correspond to digital model assembly data stored in the memory which includes nominal dimensions and tolerances;

the programming code being further configured to compare the 2-dimensional cross-sectional image to a preferred 2-dimensional cross-sectional image or to preferred dimensions for the 2-dimensional cross-sectional image, and to determine a process capability index based on the nominal dimensions and the tolerances to determine whether the assembly process is acceptable based on whether the process capability index is above a predetermined threshold.

5. The system of claim 4 wherein the programming code is configured to compare the 2-dimensional cross-sectional image to digital model assembly data stored in the memory which includes the nominal dimensions and the tolerances.

6. The system of claim 4 wherein the programming code is configured to determine that the assembly is acceptable if the 2-dimensional cross-sectional image falls within the tolerances and to determine that the assembly is unacceptable if the 2-dimensional cross-sectional image falls outside the tolerances.

7. The system of claim 4 wherein the programming code is configured to overlay the 2-dimensional cross-sectional image with the preferred 2-dimensional cross-sectional image that includes the nominal dimensions and the tolerances for one or more features of the assembly.

11. The system of claim 4, wherein the programming code is further configured to communicate corrective action instructions to an output device for modifying the assembly process upon determining that the assembly process is unacceptable.

8. A system for determining whether an assembly process is acceptable, comprising:

an X-Ray imaging device configured to acquire 2-dimensional image data of an assembly;

a processor in electronic communication with the X-Ray imaging device;

a memory in electronic communication with the processor, wherein the memory comprises a computer tomography application executable by the processor to generate a 3-dimensional image of the assembly based on the 2-dimensional image data from the X-Ray imaging device, and programming code executable by the processor to generate a 2-dimensional cross-sectional image for a section of the 3-dimensional image of the assembly, wherein the section of the 3-dimensional image of the assembly is selected to correspond to digital model assembly data stored in the memory that includes nominal dimensions and tolerances;

the programming code being further configured to;

compare the 2-dimensional cross-sectional image to a preferred 2-dimensional cross-sectional image or to preferred dimensions for the 2-dimensional cross-sectional image; and

determine a process capability index based on dimensions of one or more features derived from 2-dimensional cross-sectional images of one or more assemblies and the nominal dimensions and the tolerances for the one or more features of the one or more assemblies, to determine whether the assembly process is acceptable based on whether the process capability index is above a predetermined threshold.

9. The system of claim 8, wherein the processor is further configured to communicate corrective action instructions to an output device for modifying the assembly process or dimensions of one or more features of the one or more assemblies to correct the assembly process to cause the process capability index to exceed the predetermined threshold.