Precesion casting method for high temperature alloy complex thin-walled castings

Abstract

The invention discloses a precision casting method for high temperature alloy complex thin-walled castings. The method comprises the following steps of: utilizing a medium frequency induction heating power supply to melt the alloy, utilizing a medium baffle to separate an upper tank and a lower tank, and utilizing an electric hoist to elevate the upper tank when a casting mold and a liquid rising tube are installed; after the installation is completed, utilizing a gas circuit control pipeline, a vacuum system and a gas tank to realize vacuum and pressure regulation in a pressure regulating furnace. By adopting the method disclosed by the invention, stable and efficient mold filling is realized, the castings is solidified sequentially, utilization efficiency of the material can be effectively improved, and the space for near-end net shape casting can be supplied; the complex, thin-walled and integral metal castings which are difficult to cast through other molding methods can be produced, so as to solve the filling problem in the pouring process of the complex thin-walled castings, and in particular, the filling capacity for the thin-walled castings with the wall thickness of less than 3mm is greatly improved. Accurate castings with high dimensional accuracy can be obtained through high temperature alloy pressure regulating investment precision casting, and the accuracy of the casting can reach between CT4 and CT6.

Description

technical field [0001] The invention relates to a precision casting method for high-temperature alloy complex thin-walled castings, in particular to a new method for investment precision casting of high-temperature alloy thin-walled castings by using a pressure regulating process, which belongs to the professional field of casting. Background technique [0002] With the continuous development of precision casting technology, the structure of key hot-end components used in the fields of aerospace, aviation, electric power and nuclear energy has also undergone tremendous changes. The direction of structural and functional integration of gas diversion is developing, which requires components to have higher dimensional accuracy, better dimensional stability, better fatigue performance and service life while having higher load-carrying capacity. Undoubtedly, these new requirements put forward higher requirements for the nickel-based superalloy investment casting system. Foreign ...

AI Technical Summary

Problems solved by technology

However, the pressure control in this patent during filling and solidification cannot achieve the desired pressure difference in an instant, and fails to achieve real instantaneous pressure adjustment, so it is named quasi-pressure regulating casting.

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