Process For Producing A Lost Model, And Core Introduced Therein

Abstract

The invention relates to a method for the production of a pattern for precision casting representation of turbine component comprising at least one cavity, whereby the prepared pattern comprises at least one core and an outer contour pattern, at least partly enclosing the core and at least partly defining the outer contour of the turbine component. The core is made from a hardening core material, which hardens during the course of the method and the outer contour pattern is made from a combustible or fusible material. The outer contour model is first produced with at least one cavity corresponding to the at least one cavity of the turbine component and subsequently, in order to form the at least one care, the hardening core material is introduced into the at least one cavity and hardened.

1 .- 12 . (canceled) 
     
     
         13 . A process for producing an investment casting model used in the production of a turbine component having at least one cavity, comprising:
 producing at least one core by introducing a hardenable core material into the at least one cavity and hardening the hardenable core material that hardens during the process;   producing an external contour model with at least one cavity corresponding to the at least one cavity of the component, where the external contour model at least partially surrounds the core and at least partially defines the external contour of the turbine component and where the external contour model is produced from a material that can be burnt or melted out; and   at least partially surrounding the external contour model by a stabilizing casing.   
     
     
         14 . The process as claimed in  claim 13 , wherein the external contour model is resin model. 
     
     
         15 . The process as claimed in claim  2 , wherein the resin model is produced by a rapid prototype process. 
     
     
         16 . The process as claimed in  claim 13 , wherein the stabilizing casing is produced by a rapid prototype process. 
     
     
         17 . The process as claimed in  claim 16 , wherein the stabilizing casing is produced from resin by a stereolithography process. 
     
     
         18 . The process as claimed in  claim 17 , wherein the resin contains a mechanically stabilizing material. 
     
     
         19 . The process as claimed in  claim 18 , wherein the mechanically stabilizing material is a metal powder. 
     
     
         20 . The process as claimed in  claim 16 , wherein the stabilizing casing is formed from metal powder by rapid laser sintering. 
     
     
         21 . The process as claimed in  claim 16 , wherein the core material is free-flowing prior to the hardening, and is poured, spread or injected into the at least one cavity of the external contour model. 
     
     
         22 . The process as claimed in  claim 21 , wherein the core material is a ceramic-based material.