Abstract: The invention relates to a method of mounting of vanes (10) at the periphery of a turbine engine disc (12), where in the disc (12) comprises sockets extending in alternation with teeth, wherein the vanes (10) comprise respectively: roots designed to be inserted into the sockets, heels (26) and blades (24) connecting the roots to the heels. According to the invention, the method comprises the steps consisting of: (a) positioning the vanes (10) such that the root of each vane is axially opposite one of the sockets in the disc, (b) providing a mounting tool (50) featuring an endpiece (40) of a shape partly complementary to the heel (26) of one of the vanes, (c) causing the endpiece (40) of the mounting tool (50) to cooperate with the heel (26) of the vane, (d) pivoting the heel (26) of the vane by a rotational movement (54) of the mounting tool (50) and (e) axially inserting the vane root into the socket of the disc.

Abstract: A blade for a turbomachine bladed wheel having N blades. At one end, the blade presents a platform that is formed integrally with an airfoil of the blade. Over a portion of the axial extent of the blade, a section through the platform wall on a plane perpendicular to the axis (X) of the wheel is constituted mainly by two first straight line segments arranged respectively on the two sides of the airfoil. Each of these segments forms an angle of 90°-180°/N relative to the radial direction on either side of the airfoil.

Abstract: A blade for a turbomachine bladed wheel, the blade comprising a root, an airfoil, and a tip. The root and the tip have respective platforms, each presenting a surface on a side toward the airfoil, which surfaces are referred to respectively as the root platform wall and the tip platform wall. Each of these platform walls is constituted by a pressure side portion and a suction side portion meeting at a crest curve.

Abstract: A method for manufacturing a turbine engine blade (25) comprising a pressure side and a suction side separated from one another by an inner space for the circulation of cooling air, the blade (25) comprising a tip (S) with a closing wall (29) joining the pressure side and suction side walls in the region of this tip (S) in order to define a well shape, the closing wall including through-holes. The closing wall (29) obtained by moulding has a considerable nominal thickness with pits (36, 37) locally reducing this thickness at each through-hole in order to facilitate the removal by chemical etching of alumina rods defining the holes. Since the closing wall (29) thus has a large nominal thickness, it can then be machined in order to form raised patterns or complex shapes inside the well.

Abstract: The present invention relates to a method for machine finishing the shape of a blank casting for a multi-vane, in particular bi-vane, nozzle of a turbine engine, comprising a first vane and a second vane extending substantially in a radial direction between two walls that are radially inner and radially outer, respectively, the suction face of the first vane defining, together with the pressure face of the trailing edge of the second vane, a cross section of flow (SP), the method comprising measuring, by means of probing, the position of predefined points on said respectively radially inner and radially outer walls on the surface of the vanes and calculating the machining allowances (?1 and ?2 respectively) on the first and second vanes with respect to the theoretical profile at said points, wherein the method comprises calculating said cross section of flow (SP) from the height of the duct between said radially inner and radially outer walls, and values of the machining allowances (?1 and ?2), a correction o

Abstract: A foundry core for manufacturing a blade of a turbomachine including a tip section offset, including a core element for forming various internal cavities, the core element including a leading-edge cavity internal core, central cavity internal cores, and a trailing-edge cavity internal core. The internal core for the central cavity adjacent to the internal core for the trailing-edge cavity includes a bulge extending toward the core for the leading-edge cavity.

Abstract: A method for manufacturing a turbine engine blade (25) comprising a pressure side and a suction side separated from one another by an inner space for the circulation of cooling air, the blade (25) comprising a tip (S) with a closing wall (29) joining the pressure side and suction side walls in the region of this tip (S) in order to define a well shape, the closing wall including through-holes. The closing wall (29) obtained by moulding has a considerable nominal thickness with pits (36, 37) locally reducing this thickness at each through-hole in order to facilitate the removal by chemical etching of alumina rods defining the holes. Since the closing wall (29) thus has a large nominal thickness, it can then be machined in order to form raised patterns or complex shapes inside the well.

Abstract: The present invention relates to a method for machine finishing the shape of a blank casting for a multi-vane, in particular bi-vane, nozzle of a turbine engine, comprising a first vane and a second vane extending substantially in a radial direction between two walls that are radially inner and radially outer, respectively, the suction face of the first vane defining, together with the pressure face of the trailing edge of the second vane, a cross section of flow (SP), the method comprising measuring, by means of probing, the position of predefined points on said respectively radially inner and radially outer walls on the surface of the vanes and calculating the machining allowances (?1 and ?2 respectively) on the first and second vanes with respect to the theoretical profile at said points, wherein the method comprises calculating said cross section of flow (SP) from the height of the duct between said radially inner and radially outer walls, and values of the machining allowances (?1 and ?2), a correction o

Abstract: The invention relates to a method of mounting of vanes (10) at the periphery of a turbine engine disc (12), where in the disc (12) comprises sockets extending in alternation with teeth, wherein the vanes (10) comprise respectively: roots designed to be inserted into the sockets, heels (26) and blades (24) connecting the roots to the heels. According to the invention, the method comprises the steps consisting of: (a) positioning the vanes (10) such that the root of each vane is axially opposite one of the sockets in the disc, (b) providing a mounting tool (50) featuring an endpiece (40) of a shape partly complementary to the heel (26) of one of the vanes, (c) causing the endpiece (40) of the mounting tool (50) to cooperate with the heel (26) of the vane, (d) pivoting the heel (26) of the vane by a rotational movement (54) of the mounting tool (50) and (e) axially inserting the vane root into the socket of the disc.

Abstract: A blade for a turbomachine bladed wheel, the blade comprising a root, an airfoil, and a tip. The root and the tip have respective platforms, each presenting a surface (15) on a side toward the airfoil, which surfaces are referred to respectively as the root platform wall and the tip platform wall. Each of these platform walls is constituted by a pressure side portion and a suction side portion situated respectively pressure side and on the suction side and meeting at a crest curve (45, 65). Fabrication of the blade is facilitated in particular by the fact that every point of a first surface selected from the pressure side and the suction side and every point of the root and tip platform wall portions situated on the same side as the first surface presents a normal forming an acute angle or a right angle relative to a direction referred to as the first fabrication direction. A method of modeling the blade.

Abstract: A tooling for fabricating a foundry core, for making a circuit for cooling a blade of a turbine engine, the tooling including: a mold for injecting a paste and including imprints for a first portion and a second portion of the core; a mechanism bearing against and/or engaging end portions of a ceramic rod that interconnects the portions of the core and that passes through the imprint for the first portion of the core; and a support mechanism in the imprint for the first portion of the core to support a substantially middle portion of the rod.

Abstract: A blade for a turbomachine bladed wheel having N blades. At one end, the blade presents a platform that is formed integrally with an airfoil of the blade. Over a portion of the axial extent of the blade, a section through the platform wall on a plane perpendicular to the axis (X) of the wheel is constituted mainly by two first straight line segments arranged respectively on the two sides of the airfoil. Each of these segments forms an angle of 90°-180° /N relative to the radial direction on either side of the airfoil.

Abstract: A foundry core for manufacturing a blade of a turbomachine including a tip section offset, including a core element for forming various internal cavities, the core element including a leading-edge cavity internal core, central cavity internal cores, and a trailing-edge cavity internal core. The internal core for the central cavity adjacent to the internal core for the trailing-edge cavity includes a bulge extending toward the core for the leading-edge cavity.

Abstract: A tooling for fabricating a foundry core, for making a circuit for cooling a blade of a turbine engine, the tooling including: a mold for injecting a paste and including imprints for a first portion and for at least one other portion of the core; a mechanism bearing against and/or engaging end portions of at least one ceramic rod that interconnects the portions of the core and that passes through the imprint for the first portion of the core; and a support mechanism in the imprint for the first portion of the core to support a substantially middle portion of the or each rod.

Abstract: A method of machining a blade in a three-dimensional machining center, the blade including an airfoil, a platform including upstream and downstream supports formed respectively under the upstream and downstream portions thereof for supporting a sealing liner, a blade root, and a stilt interposed between the platform and the blade root, the method including the upstream and downstream supports constituting two bearing points for a six-point positioning system for positioning the blade in the three-dimensional machining center.

Abstract: A method of manufacture of a wax model of an annular bladed turbomachine stator assembly includes in succession the positioning, in a mold, of a core intended to form the impression of a cavity of a blade of the assembly, the injection of a wax in the mold, and the removal of the wax model fitted with the core from the mold. The core is manufactured in metal and is positioned such that its radially internal end is housed in the portion of the mold defining the blade including the cavity, away from the radially internal end of this portion of the mold.

Abstract: A method of manufacture of a wax model of an annular bladed turbomachine stator assembly includes in succession the positioning, in a mould, of a core intended to form the impression of a cavity of a blade of the assembly, the injection of a wax in the mould, and the removal of the wax model fitted with the core from the mould. The core is manufactured in metal and is positioned such that its radially internal end is housed in the portion of the mould defining the blade including the cavity, away from the radially internal end of this portion of the mould.

Abstract: A moving blade for a high pressure turbine of a turbomachine. The blade has at least one cooling circuit including at least one cavity extending radially between a tip and a root of the blade, at least one air admission opening at one of radial ends of the at least one cavity to feed the at least one cooling circuit with cooling air, and a plurality of slots opening out from the at least one cavity and into a side of the blade in a vicinity of the trailing edge of the blade. The slots are arranged along the trailing edge between the root and the tip of the blade substantially perpendicular to a longitudinal axis of the blade, at least the slot closest to the root of the blade presenting an inclination towards the tip of the blade lying in the range 10° to 30° relative to an axis of rotation of the blade.

Abstract: A moving blade for a high pressure turbine of a turbomachine, the blade having at least one cooling circuit comprising at least one cavity extending radially between a tip and a root of the blade, at least one air admission opening at one of the radial ends of the cavity(ies) to feed the cooling circuit(s) with cooling air, and a plurality of slots opening out from the cavity(ies) and into the trailing edge of the blade, the slots being arranged along the trailing edge between the root and the tip of the blade in a manner that is substantially perpendicular to a longitudinal axis of the blade, at least the slot closest to the root of the blade presenting an inclination towards the tip of the blade lying in the range 10° to 30° relative to an axis of rotation of the blade.

Abstract: A turbo-machine comprises means for securing a fluidtight seal to the shaft thereof including a segment in the shape of a sector of a ring located in a groove formed in the wall of the shaft, the groove and the sector being of complementary shape. The radially outer surface of the sector is in tight contact with the radially inner surface of a part of the seal carrying lips which in turn provide a sealing effect by close proximity to an opposed surface of the seal on another part of the turbine. The segment is made rigid with the shaft by detachable means which pass through the lip carrying member and into the sector. In order to prevent both axial and rotational motion of the sector relatively to the groove, the mating surfaces are toroidal and eccentric with respect to the common axis of the segment and of the shaft.