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A Combined Coating Layer Technology for Water Glass Sand Mold of Large Steel Castings

A technology for water glass sand and steel castings, which is applied to coatings, molds, cores, etc., can solve the problems of rough surface of castings, long time, affecting the progress of production, etc., and achieves improved dimensional accuracy and reduced thickness. , good leveling effect

Active Publication Date: 2015-11-25
鑫工艺(上海)材料科技有限公司
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Problems solved by technology

Moreover, 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 synthesize the respective characteristics of alcohol-based and water-based coatings through formula and state control, and then match the process characteristics of large-scale steel castings with sodium silicate sand, so as to improve the comprehensive performance of coatings and improve the overall performance of coatings. Production efficiency, improving casting surface quality

Method used

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  • A Combined Coating Layer Technology for Water Glass Sand Mold of Large Steel Castings
  • A Combined Coating Layer Technology for Water Glass Sand Mold of Large Steel Castings

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Embodiment Construction

[0014] The composite coating layer process for the sodium silicate sand mold of large steel castings of the present invention is to apply three coating layers of primer, second coating and top coating on the surface of the inner cavity of the sodium silicate sand mold. First follow figure 1 The method of preparing the paint, the primer and the second layer of paint are the same, and the weight percentage of each component is: zircon powder 70%, oxidized rosin resin 0.3%, thermoplastic phenolic resin 0.8%, lithium bentonite 1.5%, isopropyl Alcohol 27.4%; the weight percentage of each component of the outermost layer coating is: zircon powder 74%, tertiary vinegar emulsion 2.2%, suspending agent 2.5%, associative thickener 1.5%, and the remaining components are water.

[0015] Then, in the process of painting the paint in the casting cavity, the base paint is controlled to have a Baume degree of 65~75°Bé during painting, and the Baume degree is adjusted with an industrial alcohol c...

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Abstract

The invention discloses a combined coating layer process for large-scale steel casting water glass sand molds. The coating is coated in three layers, the bottom coating and the second layer are an alcohol-base coating, and the outmost layer surface is a water-base coating. When in use, the three layers of coating are coated according to a certain Baume degree control. The bottom coating of the combined coating has higher attaching force on the sand molds and ensures the shielding performance of the coating layers, and the surface coating adopts a zircon powder water-base coating, ensures the sufficient fire resistance when in contact with molten steel, also obtains better leveling property and surface fineness degree than those of the alcohol-base coating and effectively improves the surface quality of castings so that the coating layer has the integrated performance exceeding the single coating. In addition, the coating thickness is reduced by about 20 percent when the excellent integrated performance of the combined coating layer process is achieved, so that the dimension precision of the castings is obviously improved.

Description

Technical field [0001] The invention relates to a coating process for casting, in particular to a coating process for water glass sand casting. Background technique [0002] For the sodium silicate sand mold of large steel castings, the casting coating, as a casting material that effectively shields the molten steel and the sand mold, requires sufficient aggregate refractoriness and smooth surface quality. Coatings often require at least three passes to obtain sufficient coating thickness. For the water glass molding process, water-based paint is used in the first contact with the sand mold. Its own water or water-based paint's poor shielding effect on moisture in the air will adversely affect the strength of the sand mold and dry the coating layer. After producing bubbles. Moreover, 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-base...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00B22C1/18
Inventor 卜伟施风华龚圣峰
Owner 鑫工艺(上海)材料科技有限公司
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