Chiller coating for molding of green-sand-casting ductile iron castings and application method thereof

Abstract

The invention discloses a chiller coating for the molding of green-sand-casting ductile iron castings and an application method thereof, which belong to the technical field of coatings for casting molding. The coating is prepared from the following components in percentage by mass: 55-60% of a graphite alcohol based coating, 30-35% of alcohol and 5-10% of ferric oxide powder. When in use, the coating is uniformly coated on the surface of chiller, and the coating thickness is 1-2 mm. By using the coating for the molding of green-sand-casting ductile iron castings disclosed by the invention, no harm is caused to castings, no influence is caused on the environment, and the quenching of ductile iron castings is reduced; meanwhile, because gas in a cavity is reduced, and the cooling speed is high, a casting has no pore defect, and the finished product ratio of the casting can reach 100%, therefore, the coating has a broad market prospect.

Description

technical field [0001] The invention belongs to the technical field of coatings for casting molding, and in particular relates to a cold iron coating for molding of wet-type casting ductile iron castings and a use method thereof. Background technique [0002] In my country's foundry industry, ductile iron products generally require low-temperature pouring, which produces a large amount of gas during pouring, resulting in castings that are prone to fire and porosity defects; and ductile iron castings have subcutaneous porosity on the processed surface after processing, resulting in a large number of waste products . Due to the large amount of gas generated in the wet casting cavity after drying, there is currently no suitable molding coating product for wet casting ductile iron castings. [0003] In recent years, with the continuous improvement of product requirements, how to use a ductile iron chilled iron coating material to reduce the occurrence of pores has become an impo...

AI Technical Summary

Problems solved by technology

At present, the materials commonly used in the industry to prepare coatings, such as graphitic alcohol-based coatings, are organic substances like alcohol, which are easy to burn and generate gas. Therefore, these materials will inevitably produce a large amount of harmful gas and smoke when pouring, and at the same time make the product very easy. porosity defects

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