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

A metal mold casting and composite sand core technology, which is applied in casting molding equipment, metal processing equipment, mold cores, etc., can solve the problems of high temperature of the core head, which is difficult to metal mold, and achieve good initial strength, excellent yield and collapse, The effect of simple preparation method

Inactive Publication Date: 2019-02-19
CHONGQING UNIV
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  • Claims
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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

Method used

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

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Embodiment 1

[0025] A method for preparing a composite sand core for metal mold casting, the composite sand core includes a heat-resistant core head and a sand core body, comprising the following preparation steps:

[0026] A The ceramic core head is made of ceramic materials with excellent heat resistance and good heat insulation ability. The shape and size of the matching part of the ceramic core head and the metal core seat are determined according to the casting process drawing. The shape and size of the matching part of the ceramic core head and the sand core body are: the minimum value of the transverse equivalent diameter is 2mm, and the maximum value of the equivalent diameter is 99%~1% of the external dimension of the sand core body in this direction; the minimum value of the longitudinal length is 2mm, The maximum longitudinal length is 99%~1% of the maximum size of the sand core body in this direction. The internal porosity and void penetration rate of the ceramic core head are...

Embodiment 2

[0033] The composite sand core includes a heat-resistant core head and a sand core body, including the following preparation steps:

[0034] A Use heat-resistant sand blocks to prepare heat-resistant sand block cores. The shape and size of the matching part of the heat-resistant sand block core head and the metal core seat are determined according to the casting process drawing. The shape and size of the matching part of the heat-resistant sand block core head and the sand core body are: the minimum equivalent diameter in the transverse direction is 2mm, and the maximum equivalent diameter is 99%~1% of the external dimension of the sand core body in this direction; the minimum longitudinal length The maximum length of the longitudinal length is 99%~1% of the maximum size of the sand core body in this direction. The internal porosity and void penetration rate of the heat-resistant sand block core head are adjusted according to the air permeability requirements of the sand core...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/10B22C1/00B22C1/18B22C1/16B22C9/06B22D18/04
CPCB22C1/00B22C1/167B22C1/18B22C9/06B22C9/103B22D18/04
Inventor 谢卫东黄耀辉魏国兵胡发平马全杨王雨扆利辉
Owner CHONGQING UNIV
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