Central heating and central cooling device used for directional solidification furnace

Abstract

The invention discloses a central heating and central cooling device used for a directional solidification furnace, and belongs to the technical field of high temperature alloy processing and manufacturing. In the device, a central heating system and a central cooling system are additionally arranged in the directional solidification furnace, so that the temperature gradient of an high temperature alloy in a directional solidification process is increased, wherein the central heating system comprises a barrel type heating body, the heating body is arranged at a central shaft encircled by a plurality of shutterings arrayed in an annular manner, and the heating body can be used for heating the inner side of a mould shell after the heating body is electrified; the centering cooling system comprises a cylindrical metal tube arranged in the center of a water cooling base plate and used for cooling the inner side of the mould shell by guiding cooling water into the cylindrical metal tube; due to addition of the central heating system and the central cooling system, the temperature gradients for single crystal growth on the inner side and the outer side of a casting in the directional solidification process are consistent, so that fast and efficient directional solidification and single crystal growth can be realized. The method is suitable for manufacture of directional solidification and single crystal parts.

Description

Technical field: [0001] The invention relates to the technical field of superalloy manufacturing, in particular to a central heating and central cooling device for a directional solidification furnace, which is used for directional solidification and directional solidification preparation of single crystal superalloys. Background technique: [0002] As we all know, cast superalloys have the advantages of high strength and high heat resistance. With the development of precision casting technology and ceramic core technology, it has become the preferred material for modern aero-engine turbine blades and guide vanes. The superalloy blades made by the early investment casting process have an equiaxed grain structure, and the matrix of the structure is cut by disordered grain boundaries. In long-term practice, researchers have found that these grain boundaries are weak parts under high-temperature stress conditions, which seriously weakens the performance of the blade; when the b...

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Problems solved by technology

As the size of the blade increases, the difference in solidification conditions between the inner and outer sides of the blade increases due to the increase in distance, so the shadow effect is more serious

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