MANUFACTURING PROCESS OF A LIGHTENED TURBOMACHINE BLADE
First Claim
1. A manufacturing process of a lightened turbomachine blade (1) comprising the steps ofobtaining a semi-finished product (100) provided with an oblong plate-like portion (101), the shape of which substantially approximates the shape of the main airfoil-shaped body (5) of the shaped airfoil (3) of the lightened blade (1) to be built;
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the construction method being characterised by additionally comprising also the steps ofpositioning in abutment on the surface of the face of the plate-like portion (101) where said hollow seat (101a) is located, above said hollow seat (101a), a covering plate (103) which is dimensioned so as to cover the surface of the face of the plate-like portion (101) where said hollow seat (101a) is located, up to the larger lateral edges of the oblong plate-like portion (101), so as to completely cover the hollow seat (101a) while remaining outside said hollow seat (101a);
fixing in a rigid and unmovable way the covering plate (103) on the face of the plate-like portion (101) by means of an adhesive layer or lap welding (7) that affects the perimeter strip or flap of the covering plate (103) that rests directly on the surface of the face of the plate-like portion (101), outside the hollow seat (101a); and
finallystripping/removing, by means of mechanical machining with material removal, the excess material from the covering plate (103) and the plate-like portion (101) which is located at the larger lateral edges of the plate-like portion (101), so as to realize the leading (3a) and the trailing edges (3b) of the shaped airfoil (3), thus to obtain the shaped airfoil (3) of the lightened plate (1).
1 Assignment
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Accused Products
Abstract
A manufacturing process of a lightened blade for turbomachines, comprising the steps of manufacturing a semi-finished product provided with an oblong plate-like portion whose shape substantially approximates the shape of the main airfoil-shaped body of the shaped airfoil of the lightened blade to be built; obtaining, substantially at the centre of one of the two faces of said plate-like portion, at least one hollow seat of predetermined shape; positioning in abutment on the surface of the face of the plate-like portion where the hollow seat is, a covering plate, the dimensions of which exceed those of the hollow seat, so as to cover the surface of the face of the plate-like portion where the hollow seat is, up to the larger lateral edges of the same plate-like portion; fixing in a rigid and unmovable way the covering plate on the face of the plate-like portion by means of an adhesive layer or lap welding that affects the perimeter strip or flap of the covering plate that rests directly on the surface of the face of the plate-like portion, outside the hollow seat; and finally, stripping/removing, by means of mechanical machining with material removal, the excess material from the resulting work piece, so as to obtain the shaped airfoil of the lightened blade.
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Citations
15 Claims
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1. A manufacturing process of a lightened turbomachine blade (1) comprising the steps of
obtaining a semi-finished product (100) provided with an oblong plate-like portion (101), the shape of which substantially approximates the shape of the main airfoil-shaped body (5) of the shaped airfoil (3) of the lightened blade (1) to be built; - and
obtaining, substantially at the centre of one of the two faces of said plate-like portion (101), at least one hollow seat (101a) of predetermined shape; the construction method being characterised by additionally comprising also the steps of positioning in abutment on the surface of the face of the plate-like portion (101) where said hollow seat (101a) is located, above said hollow seat (101a), a covering plate (103) which is dimensioned so as to cover the surface of the face of the plate-like portion (101) where said hollow seat (101a) is located, up to the larger lateral edges of the oblong plate-like portion (101), so as to completely cover the hollow seat (101a) while remaining outside said hollow seat (101a); fixing in a rigid and unmovable way the covering plate (103) on the face of the plate-like portion (101) by means of an adhesive layer or lap welding (7) that affects the perimeter strip or flap of the covering plate (103) that rests directly on the surface of the face of the plate-like portion (101), outside the hollow seat (101a); and
finallystripping/removing, by means of mechanical machining with material removal, the excess material from the covering plate (103) and the plate-like portion (101) which is located at the larger lateral edges of the plate-like portion (101), so as to realize the leading (3a) and the trailing edges (3b) of the shaped airfoil (3), thus to obtain the shaped airfoil (3) of the lightened plate (1). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A lightened turbomachine blade (1) of the type comprising at least one coupling shank (2) and a shaped airfoil (3) which is rigidly coupled/connected with said coupling shank (2) and is internally provided with a large weight-reducing recess (4);
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said shaped airfoil (3) being formed of a main airfoil-shaped body (5) which presents, substantially at the centre of one of the two faces, at least one hollow seat (5a) of predetermined shape; and
a cover plate (6) which covers the face of the airfoil-shaped body (5) where the hollow seat (5a) is located, so as to close said hollow seat (5a) obtaining the weight-reducing recess (4), and is immovably fixed on the face of the airfoil-shaped body (5) by means of an adhesive layer or a lap weld that affects the perimeter strip or flap (6a) of the cover (6) that rests directly on the surface of the face of the main airfoil-shaped body (5), outside the hollow seat (5a);said blade being characterised in that the cover plate (6) is dimensioned so as to extend on surface of the face of the main airfoil-shaped body (5) which houses the hollow seat (5a), up to reach both larger lateral edges of the main airfoil-shaped body (5), so as also to form part of the leading edge (3a) and the trailing edge (3b) of the shaped airfoil (3) of the lightened blade (1). - View Dependent Claims (13, 14, 15)
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Specification