Method of making a part and related system

Patent metadata

Field	Value
Publication number	US-9417624-B2
Application number	US-201314053941-A
Country	US
Kind code	B2
Filing date	Oct 15, 2013
Priority date	Apr 16, 2007
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A system and method of making a part, including capturing an actual tridimensional surface of each part to obtain a corresponding digitized actual surface, performing a tridimensional comparison between the digitized actual surface of each part and a nominal tridimensional surface, generating an actual location and orientation of an operation to be performed based on the tridimensional comparison, and performing the operation on the part based on the generated actual location and orientation of the element.

First claim

What is claimed is:

1. A manufacturing method, the method comprising:
providing a physical part
establishing nominal tridimensional part definition of the physical part, the nominal tridimensional part definition including a nominal part surface, and a nominal location and orientation for at least one geometrical element of the physical part, the at least one geometrical element selected from a group consisting of; a surface, a profile, an ellipse, a diameter, an angle, a plane, a slot, a hole and a groove, the nominal tridimensional part definition further including digital elements corresponding to each of the at least one geometrical element;
capturing an actual tridimensional surface of the physical part to obtain a corresponding digitized actual surface, the digitized actual surface including actual digital elements for each of the at least one geometrical element;
performing a tridimensional comparison between the digitized actual surface and the nominal part surface, including determining a corresponding one of the actual digital elements of the digitized actual surface for each of the digital elements of the nominal tridimensional part definition, determining a relative displacement and rotation between the actual digital elements of the digitized actual surface and the digital elements of the nominal tridimensional part definition;
generating an actual location and orientation of each of the at least one geometrical element on the digitized actual surface based on the tridimensional comparison; and
providing each of the at least one geometrical element on the actual surface based on the actual location and orientation of the at least one element on the digitized actual surface.

2. The method according to claim 1 , wherein capturing the actual tridimensional surface includes determining a plurality of points on the actual surface of the part, such that the digitized actual surface corresponds to a point cloud.

3. The method as defined in claim 1 , wherein providing each geometrical element on the physical part includes drilling at least one hole.

4. The method according to claim 1 , wherein the part is selected from the group consisting of a gas turbine combustor liner, a gas turbine combustor heat shield, a vane ring, a blade ring and an airfoil, and wherein providing each geometrical element on the physical part includes drilling a plurality of cooling holes.

5. The method according to claim 2 , wherein capturing the actual tridimensional surface includes determining the plurality of points such that a distance between adjacent points is smaller than a size of a smallest one of the at least one geometrical element.

6. The method as defined in claim 1 , wherein capturing the actual tridimensional surface includes scanning the part using one of a laser scanner, a tomography apparatus, a coordinates measuring machine and a photogrammetry apparatus.

7. The method as defined in claim 1 , wherein generating the actual orientation of each of the elements includes defining an actual vector corresponding to an orientation of a machining tool when machining the element.

8. The method as defined in claim 7 , wherein defining each actual vector includes performing a rotation of a nominal vector corresponding to the nominal orientation of the element on the nominal part surface to obtain the actual vector, the rotation corresponding to a necessary rotation to bring a nominal plane parallel to an actual plane, the nominal plane being tangential to the nominal part surface around the nominal location of the element and the actual plane being tangential to the actual digitized surface around the actual location of the element.

9. The method as defined in claim 8 , wherein generating the actual orientation for each of the elements further includes performing the rotation of the nominal vector and projecting each actual vector in a corresponding plane extending through the actual location of the element and through a central axis of the part to obtain the actual orientation.

10. The method as defined in claim 7 , further comprising smoothing the actual vector of each of the elements by changing the actual vector to correspond to an average of the actual vectors of a predetermined number of elements to be machined immediately before and immediately after the element.

11. The method as defined in claim 1 , further comprising, after machining each of the elements, capturing an actual tridimensional surface of each machined part to obtain a corresponding final digitized actual surface, and comparing the final digitized actual surface of each machined part with the nominal part definition to evaluate an accuracy of the machining.

Assignees

• Pratt & Whitney Canada

Inventors

• Bellerose Michel
• Blais Mario
• Ing Visal
• Bouthillier Alain

Classifications

• Y10T29/49

  Method of mechanical manufacture · CPC title

• Y10T29/49996

  Successive distinct removal operations · CPC title

• Y10T29/49778

  with aligning, guiding, or instruction · CPC title

• G05B2219/36063

  During machining, compare simulated with detected profile, correct, modify program · CPC title

• G05B19/402 Primary

  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