Three-layer plastic automobile shell and rotational molding process of three-layer plastic automobile shell

Abstract

The invention provides a rotational molding process of a three-layer plastic automobile shell, which belongs to the field of rotational molding of automobile shells and solves the problem of poor performances of the automobile shell in the prior art. The rotational molding process for the three-layer plastic automobile shell comprises the following steps: manufacturing an external die and an internal die according to an automobile type; fixedly connecting the external die with the internal die through a locking device and forming an accommodating space by the external die and the internal die; adding a rotational molding powder material and a foaming granule material with different melting points in a cavity formed by the external mold and the internal mold; and performing rotational molding after closing the dies, so as to form an internal layer and an external layer of the automobile shell by the rotational molding powder material and form a foaming layer in the middle of the internal layer and the external layer by the foaming granule material. According to the invention, the three-layer plastic automobile shell is molded one time through the rotational molding process, so that the molding period of the automobile shell is shortened; and as a three-layer structure is adopted, the strength, the rigidity and the heat-insulating property of the three-layer plastic automobile shell are all increased compared with those of the automobile shell with a two-layer structure.

Description

technical field [0001] The invention relates to the technical field of rotational molding technology of automobile shells, in particular to a rotational molding process of three-layer plastic automobile shells and the automobile shell. Background technique [0002] At present, the domestic automobile manufacturing industry mostly uses sheet metal stamping to form various car shell covers, and uses injection molding to form front and rear bumpers and car doors. Due to the high cost of cold stamping dies and injection molding, the long manufacturing period and high cost of technological improvement restrict the development of automobiles. Industrial development. Furthermore, due to the heavy weight of the sheet metal car shell, the energy consumption is high, which is unfavorable for environmental protection. However, it is difficult to pull the core of the injection mold, so the rotomolded car shell has become the best choice. [0003] However, most of the rotomolding and b...

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Problems solved by technology

However, the body of the double-layer structure still has the disadvantages

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