Method of making double-walled turbine components from pre-consolidated assemblies

A method for making double-wall turbine structures from pre-consolidated assemblies, comprising the steps of:

• forming a pre-form assembly including sacrificial materials;
• HIPing the preform to a cylindrical shape;
• removing the sacrificial materials;
• and
• ring rolling the product of the HIPing to a pre determined inner diameter.

A method for making double-wall turbine structures having a hot wall and a cold wall and having both a cylindrical and a conical portion from pre-consolidated assemblies, the method comprising the steps of:

• forming a pre-form assembly including materials for the hot wall, cold wall, and ribs and sacrificial segments for maintaining cooling channels during forming of the pre-assembly and later processing;
• hot rolling the pre-forms to reduce the section dimensions;
• ring rolling the right cylinder portion of the structure;
• cutting away the excess material of the conical portion of the rolled structure;
• ring rolling the remaining section to form a cone;
• joining the cylindrical portions axially together and the cylindrical and conical portions circumferentially together and
• removing the sacrificial material to open the cooling channels.

A method of producing annular structures having a hot and a cold wall, and joining ribs, for inner and outer components of the annulus, such as for jet engine turbine combustors, to net shape as an annular pre-form comprising the steps of:

• forming a pre-form assembly including materials for the hot wall, cold wall, and ribs and sacrificial segments for maintaining cooling channels during forming of the pre-assembly and later processing;
• rolling the pre-form to a required thickness and length as a flat pre-form;
• hoop-rolling the preform to a required thickness and a required length;
• welding the assembly;
• ring rolling to the pre-form to a desired inner diameter;
• ring-rolling or metal spinning the pre-form to produce the proper wall contour and
• removing the sacrificial material to open the cooling channels.