Method of generating an inspection program and method of generating a visual display

• US 7,146,291 B2
• Filed: 11/12/2004
• Issued: 12/05/2006
• Est. Priority Date: 05/14/2002
• Status: Active Grant

• Current Assignee: Rolls-Royce PLC (Rolls-Royce Holdings Plc)
• Original Assignee: Rolls-Royce PLC (Rolls-Royce Holdings Plc)
• Inventors: Hough, Gerald W.
• Primary Examiner(s): Tsai, Carol S. W.
• Application Number:
  US10/986,380
• Publication Number:
  US 20050171733A1
• Time in Patent Office: 753 Days
• Field of Search: None
• US Class Current: 702/182
• CPC Class Codes: G01B 21/04 by measuring coordinates of points
• CPC Class Codes: G05B 19/401 characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes G05B19/19 takes precedence
• CPC Class Codes: G05B 2219/35475 Set tolerance values
• CPC Class Codes: G05B 2219/36365 Program so that minimal tool changes are needed
• CPC Class Codes: G05B 2219/37079 Display probing result on drawing taken from cad data
• CPC Class Codes: G05B 2219/37193 Multicoordinate measuring system, machine, cmm
• CPC Class Codes: G05B 2219/37205 Compare measured, vision data with computer model, cad data
• CPC Class Codes: G05B 2219/37443 Program cmm, coordinate measuring machine, use cad data
• CPC Class Codes: G05B 2219/37449 Inspection path planner

Abstract

A computer-implemented method of generating an inspection program for a computer-controlled coordinate measuring probe comprises the steps of:

• • (a) receiving nominal geometry data for a component,
  • (b) receiving inspection requirement data specifying one or more selected shape characteristics of the component,
  • (c) determining from the nominal geometry data and the inspection requirement data an inspection path for a computer-controlled coordinate measuring probe, the inspection path enabling the measuring probe to measure actual component coordinates associated with the selected shape characteristics, and
  • (d) generating an inspection program for moving the computer-controlled coordinate measuring probe along the inspection path.

Claims

1. A computer-implemented method of generating an inspection program for a computer-controlled coordinate measuring probe, the method comprising the steps of:

(a) receiving nominal geometry data for a component,

(b) receiving inspection requirement data specifying one Or more selected shape characteristics of the component,

(c) determining from the nominal geometry data and the inspection requirement data an inspection path for a computer-controlled coordinate measuring probe, the inspection path enabling the measuring probe to measure actual component coordinates associated with the selected shape characteristics, and

(d) generating an inspection program for moving the computer-controlled coordinate measuring probe along the inspection path,

wherein before step (c) the step of determining from the nominal geometry data at least one probe position at which the probe can be reorientated without risk of collision with the component is performed.

2. A method of generating an inspection program according to claim 1, wherein the inspection path is determined so as to minimise the number of probe changes.

3. A method of generating an inspection program according to claim 1, wherein the component is a gas turbine component.

4. Computer readable program code for implementing the method of claim 1.

5. Computer readable media carrying program code implementing the method of claim 3.

6. A computer system for implementing the method of claim 3.

7. Computer readable inspection program code generated by performing the method of claim 3.

8. Computer readable media carrying inspection program code generated by performing the method of claim 3.

9. A method of inspecting a component with a coordinate measuring probe, the method comprising the steps of:

(a) receiving nominal geometry data for the component,

(b) receiving inspection requirement data specifying one or more selected shape characteristics of the component,

(c) determining from the nominal geometry data and the inspection requirement data an inspection path for the coordinate measuring probe, the inspection path enabling the measuring probe to measure actual component coordinates associated with the shape characteristics, and

(d) inspecting the component by moving the coordinate measuring probe along the inspection path,

wherein before step (c) the step of determining from the nominal geometry data at least one probe position at which the probe can be reorientated without risk of collision with the component is performed.

10. A method of generating an inspection program according to claim 9, wherein the inspection path is determined so as to minimise the number of probe changes.

11. A method of generating an inspection program according to claim 9, wherein the component is a gas turbine component.

12. A method of generating a visual display for comparing an actual profile of a component with spaced inner and outer tolerance limits for the profile, the method comprising the steps of:

(a) superimposing the inner tolerance limit, the outer tolerance limit, and the actual profile,

(b) scaling the tolerance limits and actual profile by displacing each point on one of the tolerance limits in a displacement direction away from the corresponding point on the other tolerance limit without displacing said corresponding point in the opposite direction, and furthermore displacing each point on the actual profile in said displacement direction, so that the spacing between the inner and outer tolerance limits is increased relative to distances along which the actual profile extends, but the position of the actual profile relative to said spacing is preserved, and

(c) generating a visual display of the superimposed and scaled tolerance limits and actual profile.

13. Computer readable program code imuiementing toe method of claim 12.

14. Computer readable media carrying program code for implementing the method of claim 12.

15. A computer system for implementing the method of claim 12.

16. A method of determining whether a component conforms to tolerances, the method comprising the step=or:

(a) providing an actual profile of a component, and spaced inner and outer tolerance limits for the profile

(a) superimposing the inner tolerance limit, the outer tolerance limit, and the actual

(b) scaling the tolerance limits and actual profile by displacing each pain;

on one of the tolerance limits in a displacement direction away from the corresponding point on the other tolerance limit without displacing said corresponding point in the opposite direction, and furthermore displacing each point on the actual profile in said displacement direction, so that the spacing between the inner and outer tolerance limits is increased relative to distances along which the actual profile extends, but the position of the actual profile relative to said spacing is preserved,

(c) generating a visual display of the superimposed and scaled tolerance limits and actual profile, and

(d) determining from the visual display whether the actual profile is between the inner and outer tolerance limits.