METHOD OF MANUFACTURING GAS TURBINE ENGINE ELEMENT HAVING AT LEAST ONE ELONGATED OPENING

摘要

A method of manufacturing a gas turbine engine element, for example a shroud segment. An insert has at least one elongated feature received in a mold cavity. A powder injection molding feedstock is injected. When the green part is disengaged from the mold, each elongated feature is slid out of the green part to define a respective elongated passage. The cross-sectional dimension of the elongated feature may be 0.020 inches or less, and/or a ratio between the length and cross-sectional dimension of the elongated feature may be at least 25. The method may include, after debinding and sintering, projecting a coating material while defining an obstruction between source of coating material and the open end of each elongated feature with a shoulder of the element to prevent the coating material from reaching the open end, followed by machining to remove at least a part of the shoulder.

主权项

1. A method of manufacturing a cooled shroud segment for a gas turbine engine, the method comprising:
providing a mold defining a mold cavity having a shape corresponding to the shroud segment, the mold cavity including a platform cavity shaped to define a platform of the shroud segment, the platform cavity having a mold surface corresponding to an inner surface of the platform of the shroud segment; providing an insert extending partly through the mold cavity, the insert including a plurality of elongated pins extending in the platform cavity along and spaced apart from the mold surface; injecting a powder injection molding feedstock into the mold cavity to obtain a green part through which at least part of the elongated pins extend; disengaging the green part from the mold, including sliding the elongated pins out of the green part to define a plurality of elongated cooling passages in the platform of the shroud segment; and debinding and sintering the green part to define the shroud segment.