An anti-veining agent used in foundry production

Abstract

The invention relates to an anti-veining agent used in casting production. The anti-veiling agent is divided into a first group of anti-veining agents and a second group of anti-veining agents; the components of the first group of anti-veining agents are based on weight percentages According to calculation, it is composed of α modified starch 2-3, iron oxide powder 36-40, iron powder 20-25, boric acid powder 25-30, titanium powder 1-3, coke powder 2-4 and rare earth powder 0.5-2; The components of the second group of anti-veining agents, calculated by weight percentage, include 2-3 alpha-modified starch, 36-40 iron oxide powder, 20-25 iron powder, 25-30 boric acid powder, and 1-3 titanium powder. , coke powder 2-4, rare earth powder 0.5-2, graphite powder 0.3-0.4 and ferrosilicon powder 0.4-0.65; the first group of anti-veining agents mixed into the sand core during the production process of the turbocharged shell sand core In the original sand; the second group of anti-veining agents are mixed into the paint and brushed on the surface of the sand core; improve the plasticity and receding property of the surface layer of the sand core of the turbocharged shell, and prevent the sand core from the phase change of the quartz sand in the sand core Micro-cracks on the surface are generated to avoid veining defects on the inner surface of the turbocharger housing.

Description

technical field [0001] The invention belongs to the technical field of casting auxiliary materials, and particularly relates to an anti-veining agent used in casting production. Background technique [0002] In the automobile industry, the cylinder block, cylinder head, exhaust port, automobile exhaust pipe and turbocharger housing are important parts of the automobile. When using gas or liquid, it is necessary to ensure sufficient flow area to avoid turning. And the cross section sudden change, improve the smoothness of the pipe surface, etc., reduce the resistance. When the turbocharger casing is used, the inner surface of the casing is a non-machined surface. The inner surface quality of the turbocharger casing is directly determined by the inner surface quality of the casting casing. When there is a vein defect on the inner surface of the turbocharger housing, it will change or hinder the airflow direction, reducing the ventilation efficiency of the turbocharger housin...

AI Technical Summary

Problems solved by technology

However, the surface layer of the turbocharger shell core made of this modifier has poor plasticity and yield characteristics. When using the turbocharger shell core to produce a turbocharged shell, the turbocharged shell sand When the core encounters high-temperature molten iron, the phase change of the quartz sand in the sand core will easily cause micro-cracks on the surface of the sand core, and the molten iron will penetrate into the surface of the sand core, causing veining defects on the inner surface of the turbocharger casing, reducing the ventilation of the turbocharger casing efficiency

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