Mounting for locking a vane by means of the blade thereof during machining of the root of said vane

Patent metadata

Field	Value
Publication number	US-10112275-B2
Application number	US-201113582205-A
Country	US
Kind code	B2
Filing date	Feb 28, 2011
Priority date	Mar 5, 2010
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A mounting for locking a turbine engine vane that includes a blade and at least one portion outside the blade is provided. The mounting can machine the outside portion on a machine tool and includes a stationary jaw for receiving the vane, the jaw including at least six points that form abutments and define a positioning reference system for the vane. The mounting also includes a movable jaw to ensure, during machining the outside portion, holding the vane against the stationary jaw by a clamping mechanism onto the vane blade. The movable jaw includes a first clamping mechanism exerting pressure on one of the surfaces of the blade, the pressure being substantially perpendicular to the surface. The stationary jaw includes a second clamping mechanism exerting pressure on the leading or trailing edge of the blade, the pressure being substantially oriented in the direction of the trailing or leading edge of the blade.

First claim

What is claimed is:

1. A mounting for locking in a machine tool a vane of a turbine engine, the vane including a blade with a three-dimensional form having a non-planar surface delimited by a leading edge and a trailing edge; a platform; and a root adjacent to the blade, for machining of the root, the mounting comprising:
a stationary jaw configured to receive the vane and including, defined thereon, three points forming a first set of stops along a first direction oriented perpendicular with respect to a center plane of the blade, two points forming a second set of stops along a second direction parallel to a plane of the platform, and a third point forming a third stop along a third direction perpendicular to the first and second directions, the first and second sets of stops and the third stop defining a positioning reference system for the vane on the stationary jaw; and
a movable jaw configured to ensure, during machining of the root, retention of the vane against the stationary jaw,
wherein the movable jaw includes a first vertical clamp provided on a bottom surface of a carriage which moves vertically along a vertical track, the first vertical clamp exerts a pressure in a vertical direction, on the non-planar surface of the blade, such that bearing points on the non-planar surface of the blade abut the three points of the first set of stops,
wherein the stationary jaw includes a second lateral clamp which exerts a pressure in a lateral direction on one of the leading edge or the trailing edge, oriented substantially in the direction of the other of the leading edge or the trailing edge, such that the other of the leading edge or the trailing edge abuts the two points of the second set of stops,
wherein the second clamp includes a stationary part mounted on a first surface of the stationary jaw and a movable part which moves away from or towards the stationary part via a locking screw moving inside a cylindrical seat, the movable part including convex protrusions extending in a direction parallel to a moving direction of the movable part and distributed discretely along the one of the leading edge or the trailing edge,
wherein a stop is mounted on a second surface of the stationary jaw, the stop abutting the carriage at a lowermost position of the carriage,
wherein the stationary jaw includes a recess having a bottom which is substantially parallel to the center plane of the blade when the vane is retained between the stationary jaw and the movable jaw, the recess being provided below and between the second clamp and the stop, and
wherein the first clamp comprises at least three bearing points distributed discretely on the non-planar surface.

2. The locking mounting as claimed in claim 1 , wherein the first clamp comprises at least three bearing points distributed discretely on the non-planar surface.

3. The locking mounting as claimed in claim 1 , wherein the first clamp comprises at least four bearing points distributed discretely over the non-planar surface so that the pressure exerted on the surface is, at all points, less than 100 bar.

4. The locking mounting as claimed in claim 2 , wherein a resultant of forces acting on the non-planar surface acts inside a polygon linking together the points of the first set of stops associated with the surface.

5. The locking mounting as claimed in claim 4 , wherein a resultant of forces acting on the non-planar surface acts substantially in a region of center of gravity of the points of the first set of stops associated with the surface, each of the points of the first set of stops being acted on by a same coefficient of friction.

6. The locking mounting as claimed in claim 1 , wherein the second clamp comprises at least two bearing points distributed discretely along the one of the leading edge or the trailing edge.

7. The locking mounting as claimed in claim 6 , wherein a resultant of forces acting on the one of the leading edge or trailing edge acts inside a segment linking together the two points of the second set of stops associated with the other of the leading edge or the trailing edge.

8. The locking mounting as claimed in claim 7 , wherein the resultant of the forces acting on the one of the leading edge or the trailing edge acts substantially in a region of center of gravity of the two points of the second set of stops associated with the other of the leading edge or the trailing edge, each of the two points of the second set of stops being acted on by a same coefficient of friction.

9. The locking mounting as claimed in claim 6 , wherein the second clamp has a form of a base block with protrusions.

10. The locking mounting as claimed in claim 1 , comprising a workpiece retained against the stationary jaw by the movable jaw.

11. The locking mounting as claimed in claim 1 , wherein the second clamp includes a stationary part mounted on the stationary jaw and a movable part which moves away from or towards the stationary part via a locking screw moving inside a cylindrical seat, the movable part including convex protrusions extending in a direction parallel to a moving direction of the movable part.

12. The locking mounting as claimed in claim 1 , wherein the points of the first, second, and third sets of stops all extend vertically.

13. The locking mounting as claimed in claim 1 , wherein the stationary jaw includes a recess having a bottom which is substantially parallel to the center plane of the blade when the vane is retained between the stationary jaw and the movable jaw.

Assignees

• Dupouy Olivier
• Chacon Jose
• Desmars Philippe
• Heyer Gerard
• Menguy Jean Paul
• Safran Aircraft Engines

Inventors

• Dupouy Olivier
• Chacon Jose
• Desmars Philippe
• Heyer Gerard
• Menguy Jean-Paul

Classifications

• B23Q3/063 Primary

  for holding turbine blades · CPC title

• B25B5/14

  Clamps for work of special profile {(using chains or strips B25B1/205)} · CPC title