At room temperature, the core-making method of rapidly hardening the sand core in the core box by blowing air is called the cold core box method. The cold box method includes: amine blowing cold box method, SO2 cold box method, alkaline phenolic resin blowing methyl formate cold box method, water glass blowing methyl formate cold box method, alkaline phenolic resin blowing carbon dioxide gas Cold box method.

Cold core box is an efficient core-making process. Compared with hot core box and shell core, it has the advantages of high efficiency, energy saving and good working conditions. It is now widely used in casting production.

The core making quality and speed of the cold box method are closely related to the ambient temperature, humidity, blowing temperature, blowing pressure, and blowing time. The measures to be taken to ensure the quality of the sand core are: when the raw sand temperature is high, appropriate Shorten the storage time of the sand mixture; when the raw sand temperature is low, the sand temperature regulator should be turned on to increase the sand temperature appropriately to ensure the hardening speed of the sand core; for large sand cores, the blowing pressure and Blowing time; different blowing hard gases have different requirements for blowing temperature. SO2 is a gas at room temperature and does not need to be heated. Triethylamine and methyl formate are liquid at room temperature. They are easy to condense in the pipeline in winter. The blowing pipeline needs to be properly heated. Temperature and heat preservation measures ensure that the content of triethylamine (methyl formate) in the blowing hard gas is relatively stable.

A casting adhesive that addresses the problem of low fluidity resulting in low strength and provides an extended shelf life that results in higher tensile strength. It is made of the following materials: (a) epoxy resin, (b) acrylic Esterified polyisocyanate, (c) reactive unsaturated acrylic monomer and/or acrylic polymer, and (d) oxidizing agent. The binder is mixed with casting aggregates and solidified with gaseous amine through a cold box core method to obtain a casting mold that can be used as a mold for casting metal parts.

Claim 1. A cold box core manufacturing method for preparing casting molds, which comprises: A preparing a casting mixture including the following components: (1) a larger amount of casting aggregate; and (2) A casting adhesive system with an effective bonding amount, which includes: (a) 5-80% by weight epoxy resin; (b) 10-80% by weight acrylated organic polyisocyanate; (c) 5-75% by weight % Reactive unsaturated acrylic monomers, polymers, and mixtures thereof; and (d) an effective amount of an oxidizing agent, the oxidizing agent including hydroperoxides, wherein (a), (b), (c) and ( d) is a separate component or mixed with other components, but (b) and (c) are not mixed with (d), and the weight percentages are based on (a), (b), The total weight of (c) and (d); B. Add the casting mixture obtained from step (a) to a mold; C. Harden the casting mixture in the mold to become self-supporting; and D. It is cured with gaseous amine to obtain a hard, solid, and solidified casting mold.