Crusher Wear Parts Casting Coating Requirements
Reduce the mechanical surface of the casting sticky sand and chemical sand
Mold and core have many pores in the casting and solidification process with a static pressure and dynamic pressure of the metal liquid will penetrate the pores, forming adhesion to the casting surface is difficult to clean the metal sand shell, known as the “mechanical sticky sand The use of casting coatings can close the mold and the core surface layer of sand between the pores, plug the passage of molten metal infiltration, reducing the mechanical sand casting .Liquid casting or lower temperatures, the surface will continue to generate metal An oxide film that chemically reacts with the silica sand resulting in a “chemically bonded sand” on the surface of the casting. The use of a casting coating isolates the molten metal from the surface of the mold or core and inhibits the chemical reaction between them , To reduce or eliminate the casting surface of the chemical sticky sand.
Reduce the casting surface sand and sand washed
During the casting process, the high temperature metal liquid has strong heat radiation effect on the surface of the mold and the core, and the heat pressure and heat-wet tensile strength of the mold and core will lead to casting sand casting. Type or core radiation to reduce or eliminate the generation of sand defects with a certain bonding capacity of the coating can also be infiltrated between the mold and the core surface sand to strengthen the surface of the mold or core strength and Anti-erosion ability, reduce casting sand flaw.
Improve the surface properties of castings and internal quality
By adding insulation materials and chilling materials in the coating, it can improve the temperature distribution of the mold cavity and control the solidification and crystallization process of the alloy, so as to reduce the surface cold cracking and hot cracking of the castings.Including some inoculants Or alloying elements can also play a local breeding or surface alloying, to improve the performance of casting the role of microstructure.
These are crusher wear parts on the requirements of the introduction of casting coatings, Yu Sheng companies welcome customers to negotiate business and guidance.