Composite die pipe for alloy ingot pouring

Abstract

The invention belongs to the technical field of alloy smelting preparation, and particularly relates to a composite die pipe for alloy ingot pouring. The composite die pipe comprises an outer-layer cylindrical die pipe and an inner-layer cylindrical die pipe, the inner-layer cylindrical die pipe is composed of two semicircular die pipes, the inner-layer cylindrical die pipe is arranged in the outer-layer cylindrical die pipe, and the outer surface of the inner-layer cylindrical die pipe is tightly attached to the inner surface of the outer-layer cylindrical die pipe. The cylindrical outer-layer die pipe and the two semicircular inner-layer die pipes have the same taper and length, and the two semicircular inner-layer die pipes are mutually independent and can be replaced independently. According to the composite die pipe for alloy ingot pouring, on one hand, the purity of the alloy ingot can be improved, component uniformity can be improved, component segregation can be reduced, on the other hand, the die cost can be saved, the service life of a die can be prolonged, the surface quality of the prepared alloy ingot can be improved, the demolding efficiency of the alloy ingot can be improved, and the labor cost can be saved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy smelting, and in particular relates to a composite mold tube for pouring alloy ingots. Background technique [0002] Cast superalloys are mainly used in the preparation of core hot-end parts of aero-engines and gas turbines. With the continuous improvement of performance requirements of aero-engines and gas turbines, higher requirements have been put forward for the inclusions, purity, and uniformity of cast superalloy master alloy ingots. requirements. Cast superalloy master alloy ingots are mainly prepared by melting in a vacuum induction furnace. The pre-smelting preparation involves the process of forming molds, including the combined installation of refractory risers, bottom pads and mold tubes; after the melting is completed, it involves demoulding processes, and the pouring is about to be completed. The alloy ingot comes out of the die tube. In the normal production process...

AI Technical Summary

Problems solved by technology

In the normal production process, the following main problems often exist in the formwork, pouring process and demoulding: (1) The mold tube is long, and it is difficult to clean and inspect the inner surface. If there are inclusions or pits on the inner surface, it will cause The number of inclusions in the prepared alloy ingot increases, and there are problems such as pinholes, cold shuts, and difficult demoulding on the surface of the alloy ingot; (2) The wall of the mold tube is thin, the heat of the alloy liquid is transferred through radiation, the heat dissipation efficiency is low, and the solidification speed of the molten steel is slow , eventually lead to uneven composition of the alloy ingot, or even serious segregation problems; (3) pouring alloys with higher temperatures will cause serious scalding problems, resulting in the reaction of the alloy ingot with the mold tube due to the scalding, and the product composition deviates from the technical requirements If it is scrapped, the corresponding mold tube will also be scrapped, and at the same time, it brings great difficulties to the demoulding of the alloy ingot; (4) the mold tube has been poured and used under high temperature conditions for many times, and the bending phenomenon is serious. If it is used again, it needs to be rectified again. Straight, reduces production efficiency and increases production cost

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