According to the characteristics of composite materials, combined with the actual experience in the raw process, the design points of the molding mold required for the SMC process are summarized and organized, and the design control points of the SMC mold are analyzed in detail from several aspects.

SMC molding process is an advanced composite molding method, and SMC mold is the basis of SMC process, good product quality is guaranteed by a reliable mold. Therefore, in the design work of SMC molding process, the design of SMC mold is especially important.

SMC moulding process flow

    1、In the process of SMC mold design, the cavity of the mold should be designed according to the specific size of the product. In addition to that, we have to choose the right material according to the surface quality requirements and the size of the demand of the product. In order to ensure the quality of the product and process feasibility, the shear edge and ejector system of the mold should be reasonably designed.

    2, SMC molding plastic and the usual thermoplastic, thermosetting injection molding some differences, mainly SMC molding plastic shrinkage rate is lower, so in the design of SMC mold size should be changed.

    3、SMC molding plastic is made by molding with specially designed hydraulic press. The performance and precision of the press and the design of the SMC mold are directly related to the precision of the molded product. The SMC molding process is mainly realized through the press and the SMC mold.

    4、SMC molding pressure is generally between 2.5-10.0MPa, for car grade SMC products, the molding pressure is as high as 12.0-15.0MPa, so the rigidity and parallelism of the press has high requirements, which will have a significant impact on the dimensional accuracy and surface quality of the molded products. This is especially true for mass production of products with high repeatability. In addition, the press needs to have adjustable fast closing/opening speed and slow closing/opening speed to meet different SMC molding needs and to reduce or eliminate product deformation and surface defects.