A preparation method and system for controlling the eutectic degree of molten iron to optimize casting shrinkage cavity

Abstract

The invention discloses a preparation method for controlling the eutectic degree of molten iron to optimize the shrinkage cavity of castings, comprising the following steps: S1. Measuring the eutectic degree of the original molten iron: measuring the solidification temperature curve of the molten iron in a sample cup by using a thermal analysis method , Observing the phase diagram, according to the principle of phase transition, it is known that the liquidus temperature is consistent with the solidus temperature, then the intersection point of the composition and temperature is the eutectic point, and the carbon equivalent, silicon equivalent and phosphorus content of the eutectic point are measured by instruments. The invention also proposes a system for controlling the eutectic degree of molten iron to optimize the shrinkage cavity of castings. The system adopts a cupola furnace for furnace material smelting, and uses an H27880 molten iron quality management instrument to detect components of molten iron. The present invention uses high-precision thermal analysis and temperature detection means to continuously optimize the control targets of eutectic degree, maturity, and superheat of molten iron, starting from preventing inoculation recession, eliminating proanatoid graphite structure, and optimizing the solidification structure of molten iron step by step , reduce shrinkage porosity, improve mechanical properties, reduce energy consumption, and maximize benefits.

Description

technical field [0001] The invention relates to the technical field of molten iron castings, in particular to a preparation method and system for controlling the eutectic degree of molten iron and optimizing the shrinkage cavity of castings. Background technique [0002] During the cooling and solidification process of the casting, due to the liquid shrinkage and solidification shrinkage of the alloy, holes often appear at the place where the casting finally solidifies. The large and concentrated pores are called shrinkage cavities; the small and scattered pores are called shrinkage cavities. If there are shrinkage cavities and shrinkage porosity in the casting, on the one hand, the effective bearing area of ​​the casting will be reduced, on the other hand, it will cause stress concentration, and the mechanical properties of the casting will be significantly reduced. At the same time, it also reduces the air tightness and physical and chemical properties of the casting. Es...

AI Technical Summary

Problems solved by technology

If there are shrinkage cavities and shrinkage porosity in the casting, on the one hand, the effective bearing area of ​​the casting will be reduced, and on the other hand, it will cause stress concentration, and the mechanical properties of the casting will be significantly reduced.

At the same time, it also reduces the air tightness and physical and chemical properties of the casting

Especially for pressure-resistant parts, it is easy to leak and make the casting scrap

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