Process for manufacturing and molding double-layer plastic vehicle body

Abstract

The invention relates to a process for manufacturing and molding a double-layer plastic vehicle body, which comprises the following steps: (1) according to the profile of the vehicle body, manufacturing a concave die and a convex die respectively, and arranging outer edges on the bottoms of the concave die and the convex die respectively; (2) adding a plastic raw material into the concave die or the convex die, locking the concave die and the convex die through the outer edges on the bottoms thereof, performing heating, rotation, cooling and other steps, rotationally molding to form a hollow plastic vehicle body shell, and positioning the hollow plastic vehicle body shell in a shaping mould for shaping; and (3) foaming a hollow part of the hollow plastic vehicle body shell to form a middle foam plastic layer. The process adopts rotational molding to integrally shape the vehicle body shell, which can reduce the working procedures and simplify the process on one hand and makes the mould have simple structure, convenient processing and low manufacturing cost on the other hand; and meanwhile, a vehicle body product has the advantages of even wall thickness, no joint, difficult deformation and the like.

Description

Technical field: [0001] The invention relates to a manufacturing process of a body shell of various motor vehicles such as automobiles and an electric vehicle, in particular to a manufacturing and molding process of a double-layer plastic body. Background technique: [0002] Chinese utility model patent ZL01142849.X discloses a new type of plastic body structure, which is composed of body parts connected by a skeleton and an outer shell. The metal skeleton forms the inner bracket of the body part. The sandwich member formed by merging the outer sheets leaves sufficient space in the sandwich member to accommodate the inner bracket, and fills the space of the sandwich member with foam plastic, and then fixes the overall shell to form a body part. The disadvantages of this structure are: 1. The inner plastic sheet and the outer sheet should be made separately by a large injection molding machine and a molding die, and then fixed together to form a sandwich member after the alum...

AI Technical Summary

Problems solved by technology

The disadvantages of this structure are: 1. The inner plastic sheet and the outer sheet should be made separately by a large injection molding machine and a molding die, and then fixed together to form a sandwich member after the aluminum alloy inner bracket is assembled. There are many procedures and the manufacturing process is complicated.

2. When made by injection molding process, due to the need to withstand high pressure, the mold is heavy and complicated, and the manufacturing cost is high. Moreover, the injection molding process is also easy to make the molded plastic inner and outer sheets have uneven wall thickness and surface seams, etc.

3. The aluminum alloy inner bracket is installed between the inner plastic sheet and the outer sheet. Although the strength of the outer shell of the car body is ensured, the cost of raw materials is also greatly increased.

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