SMC composite material is the abbreviation of Sheet molding compound, that is, sheet molding compound. The main raw materials are composed of GF (special yarn), UP (unsaturated resin), low shrinkage additives, MD (filler) and various additives. SMC composite materials and SMC molded products have excellent electrical insulation properties, mechanical properties, thermal stability, and chemical resistance. Therefore, the application range of SMC products is quite wide. The current development trend is that SMC composite materials will eventually replace BMC materials.
SMC compression molding process
The basic process of the compression molding process is to put a certain amount of preheated molding material into the preheated mold, and apply a higher pressure to fill the mold cavity with the molding material. Under predetermined temperature conditions, the molding material is gradually solidified in the mold cavity, and then the SMC product is taken out of the mold, and necessary auxiliary processing is performed to obtain the final product.
The molding process of sheet molding compound (SMC) is to first cut the required sheet molding compound (SMC) into the required shape, remove the protective film on both sides, overlap it according to certain requirements, and then place it in the mold. At the appropriate position, it is heated and pressurized to form according to the specified process parameters.
The pressing process of composite molded products (as shown in the figure) is the process of curing into a product in the mold cavity in the presence of a curing agent or heating after pressing and loading the mold. Molding temperature and molding pressure affect the quality of SMC products together. It is necessary to determine the best molding temperature, molding pressure and pressure holding time under the comprehensive consideration of various influencing factors.
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