|Fig. 22-3 Method of producing an engine component by sand casting.|
|Fig. 22-4 Automatic investment casting.|
21. All casting techniques depend upon care with methods of inspection such as correct chemica composition, test of mechanical properties, radiolog- ical and microscopic examination, tensile strength and creep tests. 22. The complexity of configurations together with accurate tolerances in size and surface finish is totally dependent upon close liaison with design, manufacturing, metallurgist, chemist, die maker, furnace operator and final casting.
23. In the pursuit of ever increasing performance, turbine blades are produced from high temperature nickel alloys that are cast by the investment casting or lost wax' technique. Directionally solidified and single crystal turbine blades are cast using this technique in order to extend their cyclic lives.
|Fig. 22-5 Robot cut-off|