A kind of preparation method of composite sand core for metal mold casting

Abstract

The invention discloses a composite sand core for metal mold casting and a preparation method of the composite sand core for the metal mold casting. The preparation method of the composite sand core for the metal mold casting comprises the steps that firstly, a heat-resistant core head is manufactured from ceramic materials or heat-resistant sand blocks; the core head is placed at a corresponding position in a core box; core sand obtained through even mixing of sand, water and an additive is placed in the core box and compacted; and finally, freezing is conducted, and then the composite sand core is obtained. By the adoption of the composite sand core for the metal mold casting and the preparation method of the composite sand core for the metal mold casting, heat transmitted by a high-temperature metal mold to a frozen sand core body can be greatly reduced, the frozen sand core placed in the metal mold can maintain high strength for certain time, so that metal mold casting technological requirements are met, and it is possible that the environment-friendly excellent-performance frozen sand core can be applied to metal mold gravity casting, low-pressure casting and the like.

Description

technical field [0001] The invention relates to the technical field of metal material forming, in particular to a method for preparing a composite sand core for metal mold casting. Background technique [0002] Metal mold casting, also known as hard mold casting, is a casting method in which liquid metal is poured into metal molds to obtain castings, including gravity casting, low pressure casting, differential pressure casting, and anti-gravity casting. The casting mold of metal mold casting is made of metal, which has strong cooling ability for castings, dense structure and high mechanical properties of castings. The inner cavity of metal mold casting can be formed by metal core or sand core. For inner cavities with complex shapes that are difficult to form by core pulling, sand cores are usually used to form them. At the same time, sand cores have better yield than metal cores, which is conducive to reducing the tendency of hot cracking and cold cracking of castings. Th...

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Problems solved by technology

[0003] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a method for preparing a composite sand core for metal mold casting in which a frozen sand core body and a heat-resistant core head are combined, so as to solve the problem that the core head of an ordinary frozen sand core is difficult to withstand the high temperature of the metal mold. The problem

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