One-time molding process of double-layer plastic car shell

Abstract

The invention provides a one-step molding process of a double-layer plastic vehicle shell, and the process comprises the steps of: (1) manufacturing a concave die and a convex die respectively based on the contour of a vehicle shell, and manufacturing various loose cores additionally; (2) inserting various the loose cores into the concave die, and adding powdered plastics into the concave die and the convex die; (3) conducting die closing; (4) shifting the dies into a heating chamber, and making them rotate ceaselessly along a main shaft and an auxiliary shaft that are mutually perpendicular, as well as conducting heating; (5) shifting the dies into a mist cooling chamber for mist cooling; (6) shifting the dies into an aeration and pressure maintaining chamber for aeration, pressure maintaining and shaping; (7) shifting the dies into a wind cooling chamber for wind cooling; (8) dismantling all loose cores and releasing the dies so as to obtain a double-layer plastic vehicle shell product with reserved various accessory mounting holes; and (9) shaping the various accessory mounting holes of the product through shaping dies. In the invention, the whole double-layer plastic vehicle shell is molded in one step through the above rotational molding process, so that the manufacturing process and the die structure are greatly simplified. And the molding process of the invention has the advantages of convenient manufacturing, high production efficiency, low manufacturing cost, and good product performance, etc.

Description

Technical field: [0001] The invention relates to a method for making a double-layer plastic car shell, in particular to a one-time molding process for a double-layer plastic car shell. 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 plastic inner sheet and the plastic outer sheet need to be made separately with a large injection molding machine and a molding mold. After the metal inner bracket is installed, they can be fixed together to form a sandwich member, and then the s...

AI Technical Summary

Problems solved by technology

The disadvantages of this structure are: 1. The plastic inner sheet and the plastic outer sheet need to be made separately with a large injection molding machine and a molding mold. After the metal inner bracket is installed, they can be fixed together to form a sandwich member, and then the sandwich member must be formed. Internal foaming, etc., so there are many processes and inconvenient production; 2. The mold is heavy and complicated, and the manufacturing cost is high; 3. This production method is also easy to make the wall thickness of the formed plastic inner and outer sheets uneven and the surface and joints. Seams, etc.; 4. Set the metal inner bracket and foam between the inner plastic sheet and the outer sheet. Although it can ensure the strength of the outer shell of the car body, it also greatly increases the cost of raw materials and the weight of the car body shell

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