During the SMC molding process, several key factors must be considered, such as molding temperature, molding pressure, and molding time.
During the SMC molding process, several key factors must be considered, such as molding temperature, molding pressure, and molding time.
First, in the process of SMC compression molding, it is necessary to pay attention to the control elements
Pressure is usually expressed by (MPA), that is, the ratio of the total force applied by the FRP hydraulic pressure to the pressure and the ratio of the projected area of the balance to the pressure. In the molding process, the role of pressure is to increase the density of the material, and to promote the flow of the molded material and the source of pressure generated by the volatilization of low-molecular materials in the molding aid. When processing products with complex shapes, thin walls, depths or large areas, it is necessary to overcome a large flow resistance to fill the mold cavity, so a higher molding pressure is required.
The spreading high temperature may accelerate the cross-linking reaction, thereby rapidly increasing the viscosity of the covering, so higher molding pressure is required to match, and higher pressure will increase the density of the product, promote rapid flow of mold filling, overcome swelling and prevent the appearance of pores . But too much pressure will reduce the service life of the mold, increase the power consumption of the hydraulic press, and increase the residual stress in the product. Therefore, when processing thermosetting plastic molded products, pre-pressing, pre-heating, and appropriately increasing the molding temperature are often used to avoid the use of high molding pressure.
Second, the molding process characteristics of the molding compound
The molding process of thermosetting plastics is a process of both physical and chemical changes (thermoplastics only need physical changes). The molding process performance of the molding material is of great significance to the control of molding process conditions and the improvement of production quality. The molding process performance of the molding compound mainly refers to the mobility, curing rate, shrinkage rate and shrinkage ratio.
The molding process has high efficiency and is one of the advanced glass fiber reinforced plastic products molding processes. Because this material has the advantages of good strength, corrosion resistance, impact resistance, arc resistance and bright flatness, it has generally replaced metal materials in many areas, and has the advantages of incomparable metals. Such as: light specific gravity, corrosion resistance, insulation, bright colors, high application rate, low consumption cost, mechanized continuous consumption, stable production quality, good operating environment and sanitary conditions, strong designability, and many other advantages. Therefore, in transportation , Establishment, electrical appliances, chemical industry and many other industrial and civil fields, have been widely used.
Focus on the application scope of SMC molded products
Applications in the automotive industry: 1. Suspension parts, front and rear bumpers, dashboards, etc. 2. Body and body parts: Body shell, hard shell roof, floor, door, heat dissipation air grille, front end panel, spoiler, luggage compartment cover, sun visor, SMC fender, launcher hood, large Light reflector. 3. Parts under the engine cover, such as the air conditioner shell, air duct, air intake pipe cover, fan guide ring, heater cover, water tank parts, brake system parts, and battery bracket, engine sound insulation board, etc.
Applications in railway vehicles: SMC railway vehicle window frames, toilet components, seats, coffee table tops, SMC carriage wall panels and SMC roof panels, etc.
Wuxi Pengda Haizhuo Intelligent Equipment Co., Ltd. (PHP) specializes in the production of SMC product hydraulic presses. It adopts a servo system, which is highly efficient and energy-saving, stable in operation, and does not leak oil. At the same time, it adopts environmental protection devices and is environmentally friendly. If you have related questions, please contact us.
Email: cindy@wuxipd.com
Phone: +86 0510 83394311
