Sand core repair paste, preparation method thereof and sand core

Abstract

The invention provides sand core repair paste, a preparation method thereof and a sand core, and relates to the technical field of casting core manufacture. The sand core repair paste includes first paint, second paint, bentonite and other raw materials. By means of synergetic cooperation of the raw materials mentioned above, the prepared sand core repair paste can have a low gas evolution amountand is moderate in viscosity and convenient to operate; and by using the sand core repair paste mentioned above for sand core repair, the defects of pasted sand, pores and the like in inner cavities of castings can be effectively overcome, and the problems that due to existing sand core repair paste, the gas evolution amount of the sand core is prone to be increased and the pasted sand, the poresand the other defects are caused to the inner cavities of the castings are solved. The invention further provides the preparation method of the sand core repair paste mentioned above. The preparationmethod is simple in process, easy to operate and suitable for industrial production. The invention further provides the sand core. The sand core is repaired through the sand core repair paste mentioned above. An inner cavity of the obtained sand core is smooth, the requirement of manufacturers for roughness of the inner cavity is met, the defects of the pasted sand and the pores in the inner cavities of the castings are overcome, and the overall quality of the sand core is improved.

Description

technical field [0001] The invention relates to the technical field of foundry core making, in particular to a sand core repair paste, a preparation method thereof and a sand core. Background technique [0002] Core making is an important link in the casting process. Coated sand thermal core making is generally to preheat the silica sand to a certain temperature, add resin to melt it, stir to coat the resin on the surface of the sand, and then add a curing agent (such as urotropine), a lubricant (such as stearic acid) Calcium) and special additives, so that the coated sand is solidified and formed to form the inner cavity, holes and other parts of the casting. Due to the influence of factors such as heating temperature, air pressure, core box exhaust, and the formula of coated sand, there are defects in the core-making process that the sand core is not solid, so it is necessary to repair the defect position with sand core repair paste . [0003] Sand core repair paste is ...

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a sand core repair paste, the sand core repair paste is mainly composed of the first paint, the second paint and bentonite, the use of the sand core repair paste can greatly reduce the gas generation of the sand core , effectively solve the defects of sand sticking and pores in the inner cavity of castings, and improve the problems that the existing sand core repair paste easily causes the increase of gas generation in the sand core, and there are defects such as sand sticking in the inner cavity of castings and other pores

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