Abstract: A head part of an annular gas turbine combustion chamber including: an end wall with a passage opening for accommodating a burner, the end wall including a set back portion adjacent the passage opening; a heat shield covering a back side of the end wall which faces towards the combustion chamber, the heat shield including a protruding portion shaped to cooperate with the set back portion of the end wall; and a burner collar adapted to fit within the passage opening and receive a burner, the burner collar including a protruding portion radially protruding from an outer surface of the burner collar; wherein the head part of the annular gas turbine combustion chamber is configured such that in an installed configuration the protruding portion of the burner collar is held between the protruding portion of the heat shield and the set back portion of the end wall.

Abstract: A method of forming an aperture in an article includes directing a laser at the article and traversing the high energy beam to form a cut extending along the periphery of the aperture in a first direction to a second point on the periphery and then reversing the direction of cutting along the periphery till the aperture is formed.

Abstract: A mold assembly (100) for forming an object, the mold assembly comprising: a first mold portion (110) comprising an internal surface (112), an external surface (114) and an opening (116) leading from the internal surface to the external surface; and a second mold portion (120) positionable with respect to the opening (116) to cover the opening; wherein the first and second mold portions define an interior (130) for receiving a material to be molded into the object; and wherein the second mold portion comprises a surface (122) adapted to face the interior of the mold assembly and form a feature on the object.

Abstract: A head part of an annular gas turbine combustion chamber including: an end wall with a passage opening for accommodating a burner, the end wall including a set back portion adjacent the passage opening; a heat shield covering a back side of the end wall which faces towards the combustion chamber, the heat shield including a protruding portion shaped to cooperate with the set back portion of the end wall; and a burner collar adapted to fit within the passage opening and receive a burner, the burner collar including a protruding portion radially protruding from an outer surface of the burner collar; wherein the head part of the annular gas turbine combustion chamber is configured such that in an installed configuration the protruding portion of the burner collar is held between the protruding portion of the heat shield and the set back portion of the end wall.

Abstract: A method of joining a first article to a second article using adjustment features located in an assigned scrap portion of the first article. The first article can be a casing for a turbine engine the first article being the casing skin and the second article a flange. The adjustment features are springs that can be stretched to increase the circumference of the skin. Following the correct sizing of the skin and joining to the flange the attachment features are removed along with the assigned scrap portion of the skin.

Abstract: A mould assembly (100) for forming an object, the mould assembly comprising: a first mould portion (110) comprising an internal surface (112), an external surface (114) and an opening (116) leading from the internal surface to the external surface; and a second mould portion (120) positionable with respect to the opening (116) to cover the opening; wherein the first and second mould portions define an interior (130) for receiving a material to be moulded into the object; and wherein the second mould portion comprises a surface (122) adapted to face the interior of the mould assembly and form a feature on the object.

Abstract: A method of joining a first article to a second article using adjustment features located in an assigned scrap portion of the first article. The first article can be a casing for a turbine engine the first article being the casing skin and the second article a flange. The adjustment features are springs that can be stretched to increase the circumference of the skin. Following the correct sizing of the skin and joining to the flange the attachment features are removed along with the assigned scrap portion of the skin.

Abstract: A coated turbine engine article having a first wall and a second wall, wherein the first wall has a shielding feature integral with the article and which inhibits entry of a coating material into an open passage extending between the first wall and the second wall when the coating material is directed towards the article using a line of sight process.

Abstract: A method of forming an aperture in an article the method comprising the steps of directing a laser at the article and traversing the high energy beam to form a cut extending along the periphery of the aperture in a first direction to a second point on the periphery and then reversing the direction of cutting along the periphery till the aperture is formed.

Abstract: A method of producing an angled hole 14 in a workpiece 10 includes the steps of: using a laser beam to produce an initial orifice in the workpiece 10; translating the laser beam away from the initial orifice to a starting point at a periphery of the hole 14 to be produced; and moving the laser beam such that it traces an elliptical path on the surface of the workpiece, thus defining the periphery of the hole 14, whilst maintaining the focus of the laser beam on the workpiece surface. The starting point is located in a region of the edge of the angled hole which meets the surface of the workpiece at an obtuse angle.

Abstract: A method of producing an angled hole 14 in a workpiece 10 includes the steps of: using a laser beam to produce an initial orifice in the workpiece 10; translating the laser beam away from the initial orifice to a starting point at a periphery of the hole 14 to be produced; and moving the laser beam such that it traces an elliptical path on the surface of the workpiece, thus defining the periphery of the hole 14, whilst maintaining the focus of the laser beam on the workpiece surface. The starting point is located in a region of the edge of the angled hole which meets the surface of the workpiece at an obtuse angle.