Process for large high-alloy steel resin bonded sand mould composite coating

Abstract

The invention discloses a process for a large high-alloy steel resin bonded sand mould composite coating. The large high-alloy steel resin bonded sand mould composite coating comprises three layers of coatings, wherein the primer is an alcohol based coating, the second layer is a composite aggregate waterborne coating, and the outermost layer is a waterborne coating. When in use, the three layers of coatings are coated under the control of a certain Baume degree. In the composite coating, the primer has strong adhesion to a sand mould and ensures shielding performance of the coating; the second layer is the composite aggregate waterborne coating, which not only increases the sintering property of the coating, but also reduces the production cost; the top coating is a zircon powder waterborne coating, which ensures sufficient refractoriness in contract with molten steel, achieves better levelling property and higher surface fineness than an alcohol based coating, effectively improves the surface quality of a casting and achieves high comprehensive property than a single coating. By the process of the composite coating, excellent comprehensive property is achieved, the thickness of the coating is reduced by 20%, and the size accuracy of the casting is improved greatly.

Description

technical field [0001] The invention relates to a coating technology for casting, in particular to a coating technology for resin sand casting. Background technique [0002] For large high-alloy steel resin sand molds, casting coatings, as a casting material that effectively shields molten steel and sand molds, require sufficient aggregate refractoriness and smooth surface quality. Paint tends to require at least three coats to achieve adequate coat thickness. For large castings, it takes a long time to dry using water-based coatings. If all water-based coatings are used, it will inevitably affect the progress of production. However, if all alcohol-based coatings are used, it does have obvious advantages over water-based coatings in terms of moisture isolation, drying and curing speed. However, all sand molds of large castings are ignited, which is dangerous after all, and the surface quality of alcohol-based coatings is inferior. The water-based paint is fine and smooth, ...

AI Technical Summary

Problems solved by technology

For large castings, it takes a long time to dry using water-based coatings. If all water-based coatings are used, it will inevitably affect the progress of production

However, if all alcohol-based coatings are used, it does have obvious advantages over water-based coatings in terms of moisture isolation, drying and curing speed. However, all sand molds of large castings are ignited, which is dangerous after all, and the surface quality of alcohol-based coatings is inferior. The water-based paint is fine and smooth, which makes the surface of its castings rough

[0003] In the prior art, there is no process that can reasonably integrate the respective characteristics of alcohol-based and water-based coatings through formula and state control, and then match the process characteristics of large-scale resin sand and high-alloy steel parts to improve the comprehensive performance of the coating and improve the overall performance of the coating. Production efficiency, improving casting surface quality

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