Double-buffering casting system for directional hollow turbine work blade

Abstract

By aiming at the problem of core fracture and leakage occurring in the casting process of a hollow turbine work blade and the problem of wall thickness due to eccentricity, the invention provides a double-buffering casting system for a directional hollow turbine work blade, and belongs to the field of directional solidification of investment casting. The casting system consists of a circuitous casting funnel, a sprue cup, an upper part filter screen, an upper circular disc, a solid plug sheet, a hollow pipe, a vertical sprue, a lower part filter screen, a transverse straight sprue, a blade die case cavity, a middle post pipe, a bottom disc and an exhaust passage, wherein through the buffering effect of the circuitous casting funnel, the upper circular disc, the vertical sprue, the transverse sprue and the filter screens on metal liquid, the flowing speed of the metal liquid can be decelerated, so the impact of the metal liquid on a ceramic die core arranged in the die case cavity is greatly reduced, the problem of core fracture and leakage easily occurring in the casting process and the problem of wall thickness due to eccentricity can be greatly solved, the rejection rate is reduced, and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of directional solidification of investment casting, in particular to a double buffer pouring system for directional hollow turbine working blades. Background technique [0002] During the directional solidification process of hollow turbine working blades, the ceramic core needs to be soaked at a high temperature above 1500°C for more than one hour, which puts forward higher requirements for the high-temperature strength of the ceramic core, especially during the pouring process. The high crucible pours down through the sprue of the mold shell and directly enters the cavity. Due to the high density of the superalloy metal liquid, it is easy to cause impact on the ceramic core in the cavity, resulting in core breakage and core leakage during the pouring process. Unqualified blade wall thickness caused by eccentricity. Contents of the invention [0003] Aiming at the problems of broken and leaky cores and wall thick...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of broken and leaky cores and wall thickness problems caused by eccentric cores during the pouring process of hollow turbine working blades, the invention provides a double buffer casting system for directional hollow turbine working blades

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