Design method of duplex directional hollow blade casting system

Abstract

The invention provides a design method of a duplex directional hollow blade casting system. The method comprises the steps: combining casting systems; manufacturing a mold shell of a wax mold module;and putting the mold shell into a three-chamber vacuum furnace to complete casting, wherein the casting temperature of a casting piece is 1480 DEG C, and the crystal pulling speed is 4 mm / min. The combination of the casting systems specifically comprises the steps of determining the diameter of a module chassis; determining the process epitaxy of blades; determining the position of the starting section on the module chassis; determining the height of a middle straight pipe of the module; connecting a casting system mold filling path; arranging a cross gate connected with the middle straight pipe and a pouring cup; and connecting the pouring cup to the upper portion of the middle straight pipe. By designing and optimizing the combination mode of the casting system, the problems of metallurgical defects such as broken crystals, oblique crystals and exposed crystals of columnar crystals at the position of an exhaust edge are successfully solved, and deformation of casting pieces in the casting process is effectively controlled.

Description

technical field [0001] The invention belongs to the field of investment precision casting, and in particular relates to a design method of a double-connected directional hollow vane pouring system. Background technique [0002] The new generation of aero-engine high-pressure turbine guide blades are mostly double-connected directional hollow blades with an air-cooled structure, which have geometrical characteristics such as hollow, thin-walled, complex, and wide-chord. There are technologies such as grain size, looseness, and cracks in investment casting. Difficulties. At the same time, with the change of the temperature field during the crystal pulling process, it is difficult to control the size of the alloy and the matching shrinkage between the shell and the core. [0003] At present, the casting of guide vanes with hollow air-cooled duplex structure using directional crystallization process is still in its infancy in China, so there are few materials that can be used fo...

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Problems solved by technology

[0004] In view of the lack of control level of the growth orientation of columnar crystals and other metallurgical problems in the existing double-connected directional hollow blade casting system, the present invention provides a design method for the pouring system, the purpose of which is to control the growth direction of the columnar crystals of the double-connected directional hollow blades, To ensure the control of the deviation and divergence of columnar crystal growth, the deviation is the angle between the growth direction of the columnar crystal and the main axis of the blade, and the divergence is the angle between the deviation of two adjacent columnar crystals, while improving the metallurgical quality of the stable blade and improving the precision casting of the blade. Pass rate

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