초록 ▼

A method of making an investment casting mould comprises producing a CAD definition of a turbine blade, and determining the distribution of isosurfaces of constant temperature around the CAD definition of the at least one article if the external surface of the CAD definition of the at least one arti

A method of making an investment casting mould comprises producing a CAD definition of a turbine blade, and determining the distribution of isosurfaces of constant temperature around the CAD definition of the at least one article if the external surface of the CAD definition of the at least one article was at a high temperature (Thigh). One of the isosurfaces of constant temperature is selected to define the external shape and the thickness of an investment casting mould. A pattern of the turbine blade is produced from the CAD definition of the turbine blade. The investment casting mould is made with an internal shape defined by the pattern of the turbine blade and an external shape and thickness distribution defined by the selected isosurface of constant temperature. The pattern is then removed from the investment casting mould.

대표청구항 ▼

[ I claim:] [1.] A method of investment casting comprising the steps of:(a) producing a CAD definition of at least one article to be produced,(b) determining the distribution of isosurfaces of a constant physical property around the CAD definition of the at least one article if the external surface

[ I claim:] [1.] A method of investment casting comprising the steps of:(a) producing a CAD definition of at least one article to be produced,(b) determining the distribution of isosurfaces of a constant physical property around the CAD definition of the at least one article if the external surface of the CAD definition of the at least one article was held at a predetermined physical property value,(c) selecting one isosurface of the constant physical property value to define the external shape and the thickness of an investment casting mould,(d) making a pattern of the at least one article to be produced from the CAD definition of the at least one article,(e) making the investment casting mould with an internal shape defined by the pattern of the at least one article to be produced and an external shape and thickness distribution defined by the selected isosurface of constant physical property value,(f) removing the pattern from the investment casting mould,(g) pouring molten metal into the investment casting mould,(h) solidifying the molten metal in the investment casting mould to produce the at least one article,(i) removing the at least one article from the investment casting mould.