Study On Process Of Rotationally Molded Truck Fender

A new plastic molding technique, rotational molding is capable of producing hollow plastic parts. In this regard, the mold is subjected to a biaxial rotation under heating, resulting in that the rotating plastic powder in the mold contacts the inner surface of the mold, changes into the melt and shapes hollow plastic parts. Rotational molding has many advantages over other molding process, including①The mold does not endure very high pressure and does not need very high strength, so the equipment and the mold are simple, conveniently made and have a low cost.②Rotational molding is particularly suitable to produce the complicated large hollow product.③Better performance multiplayer products, such as double wall product with high impact strength out-layer and good chemical stability inner-layer can be produced by the combination of different materials.④The product has equal thickness, without corner scrap and welding line, so the process saves raw materials.⑤There is not inner stress in the product because of the zero press molding, and there is not distortion and crack.The main study work is summarized as follows:1. Rotationally molded truck fender part design The design outline of rotationally molded truck fender was analyzed firstly. And the external load, structure design and basic parameter were deeply researched. The structure design, including wall thickness, clearance among parallel wall surfaces, enhancement rib, drafting angle, fillet angle and tolerance etc, was the study emphases. The key dimensions were determined, and the usage requirement was considered enough in the design. At last the part design was finished and the study result can guide rotationally molded truck fender process development and mold design.2. Rotationally molded truck fender process development and mold design...