Casting coating is a widely used auxiliary material in casting processes, which can help improve the quality of casting products. The correct use of casting coatings during the casting process can effectively reduce the defect rate of castings, improve the surface quality of castings, and enhance the overall quality level of products. Below, we will provide a detailed introduction on how to use casting coatings to improve product quality during the casting process, including the types, usage methods, and effects of casting coatings.

Casting coatings are divided into two categories: mold coatings and sanding agents. Mold coatings are mainly used to apply on the surface of molds, providing insulation, air separation, and protecting the mold. Commonly used types include silicate, organic, and water-based molds. Sanding agents are mainly used to improve the surface quality of castings, control the size and shape of castings, and commonly used include water glass molds, water-soluble film molds, and organic molds. Specifically, how to use casting coatings to improve product quality will be introduced from several aspects.

When applying mold coating, attention should be paid to the uniformity and thickness control of the coating. Uneven application or excessive coating thickness can greatly affect the airtightness and surface quality of the mold. Therefore, when applying mold coating, a uniform application method should be adopted to ensure that the surface of the mold is coated as a whole, avoiding situations of missed coating or uneven coating thickness. In addition, it is necessary to control the thickness of the coating reasonably based on the specific shape and size of the casting, in order to avoid excessive coating causing poor sintering or uneven shrinkage of the casting.

Secondly, in the selection of sand coating agents, appropriate sand coating agents should be selected according to different casting requirements. For example, in castings that require forging or processing, a sand coating agent that is easy to remove should be selected to reduce the difficulty of cleaning and processing in subsequent processes. In addition, during the use of sanding agents, attention should also be paid to the uniformity of application and the thickness of the coating. Applying sand coating too thinly can lead to a higher surface roughness of the casting, while applying too thick may cause coating peeling or incomplete curing. Therefore, when applying sand coating agent, it is important to apply it evenly and control the amount of coating to ensure appropriate coating thickness.

In addition, casting coatings need to be thoroughly dried after application to ensure the quality of the coating. Adequate drying can improve the adhesion and peel resistance of the coating, while also avoiding combustion or explosion of the coating in the furnace chamber. Therefore, appropriate drying treatment is required after applying the coating. Generally speaking, the drying time of coatings is related to environmental temperature, humidity, and coating thickness. The drying time can be controlled by detecting the humidity of the coating or using drying equipment.

The effectiveness of casting coatings also needs to be tested and evaluated. The effectiveness of casting coatings can be evaluated by testing the surface quality, size, and mechanical properties of castings. For example, the effect of casting coatings can be evaluated by observing whether there are defects on the surface of the casting, detecting whether the casting size meets the requirements, and conducting mechanical performance tests such as tensile and impact tests.

Overall, the correct use of casting coatings can help improve the quality of castings. During the casting process, attention should be paid to the uniform application of coatings and the control of coating thickness. An appropriate sand coating agent should be selected to ensure sufficient drying of the coatings, and the effectiveness of casting coatings should be tested and evaluated in a timely manner. Through these methods, the overall quality level of casting products can be effectively improved, the defect rate of castings can be reduced, and production efficiency and product competitiveness can be improved.