A kind of manufacturing method of anti-veining sand core

Abstract

The invention relates to a method for manufacturing an anti-veining sand core. The raw materials of the anti-veining sand core, calculated according to weight percentage, specifically include 94-95 quartz sand, 2.2-3.25 phenolic resin, 0.5-1 coating, and anti-veining. Texture agent 1-2 and auxiliary material 0.5-1.3; the anti-veining agent, calculated by weight percentage, includes 2-3 α-modified starch, 36-40 iron oxide powder, 20-25 iron powder, and 25-30 boric acid powder. , titanium powder 1~3, coke powder 2~4 and rare earth powder 0.5~2; and the manufacturing process of anti-veining sand core includes sand mixing, filling core box, heating and curing, unpacking and surface finishing, mixing paint, coating Paint and dry sanding; use this anti-veining core to prevent veining defects on the inner surface of the casting chamber, affecting the flow of gas or liquid in the chamber.

Description

technical field [0001] The invention belongs to the technical field of anti-veining of castings, and in particular relates to a method for manufacturing an anti-veining sand core. Background technique [0002] In casting production, the sand core and the mold cavity are enclosed to form a cavity suitable for the shape of the casting, the cavity is filled with high-temperature molten iron, and the casting is formed after solidification and cooling. In the production process of parts that require gas or liquid, such as cylinder block and cylinder head, exhaust port, automobile exhaust pipe and turbocharger housing of gasoline engine, since the inner surface of the cavity of this part cannot be machined, the part of the part cannot be machined. The quality of the cavity surface of the casting of the part is high. During the casting production process, casting defects are reduced or prevented from appearing on the surface of the inner cavity of the part of the casting, which af...

AI Technical Summary

Problems solved by technology

The surface layer of the sand core prepared by this method has the characteristics of easy collapse, poor plasticity and yield. When the sand core is used to produce castings, when the sand core encounters high-temperature molten iron, the phase change of the quartz sand in the sand core is very easy to form sand. Formation of micro-cracks on the core surface, causing veining defects on the inner surface of the casting cavity

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