Stamping of thin-walled body shells. Drawing, description

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Stamping of thin-walled body shells. Tips for a modeller

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Working on the bodywork of replica racing cars has never been easy. Athletes have developed many technologies using foam plastics, plastics, paper, cardboard and fiberglass stickers. However, each of them has some disadvantages. This may be an increased complexity and laboriousness of the process, or unsatisfactory strength and weight characteristics of the finished product.

The proposed method, which uses the vacuum drawing of a plastic film after its heating, makes it possible to “stamp” bodies in a matter of minutes after completion of not too laborious work on the preparation of fixtures. In addition, due to the selection of the initial material (film), it is possible to simultaneously solve most of the strength-weight problems that arise when creating a highway model.

The idea of vacuum drawing is not new, but it is practically not used by modellers. But in vain! It is enough to see the result obtained with this method once, as it becomes clear - this cannot be achieved with any other. The quality of reproduction of the shape of a film body completely depends on the quality of manufacture of the original body model (if a ready-made micromachine, factory-made or self-made is not used!), And the gain in weight compared to an equal-strength cardboard version is ninefold!

Stamping of thin-walled body shells
Device for vacuum stamping: 1 - elements of the finished screw clamp, 2 - frames (wood), 3 - seals (frames made of sheet microporous rubber), 4 - sheet blank, 5 - walls of the vacuum chamber (sheet steel 5 mm thick), 6 - spacer (plywood 10 mm), 7 - stand (steel, brass), 8 - leg, 9 - fitting (bicycle), 10 - M5x20 screws (30 pcs.).

The device for vacuum forming itself does not require special explanations. It should only be noted that the vacuum chamber is hermetically connected to the base, with all seams being smeared with glue of the Moment type. And wooden frames assembled from suitable bars or parts from worn-out chessboards are pasted over on the same binder with sheet microporous rubber (one frame on both sides, the second on only one). The heating of the film, in contrast to the method using photolamps of kilowatt power, is carried out with hot water, which gives an additional benefit: overheating to the point of brittleness of thin plastic is eliminated, the operation is simplified, and work safety is increased. To create a vacuum, you can use a school vacuum pump or any compressor, to the suction channel of which the hose of the forming device is connected.

The sequence of stamping operations (click to enlarge): I - preliminary reverse stamping for the formation of a "bath" from the workpiece film, II - turning the workpiece and assembling the device for the main stamping, III - main stamping (for example, a body for a track car).

The sequence of operations is shown in the figures. The first stage (reverse stamping) allows you to simultaneously check the reliability of the entire system as a whole and the ability to deform the selected film sample. The formation of an intermediate hood ("bath") makes it possible not only to use higher body models, but also improves the main process of shaping, reduces the likelihood of wrinkles and tears. In case of unsuccessful samples, sheet blanks can be used again by straightening them in a flat metal cuvette by heating with hot water.

If it is not possible to use a finished body sample as a stamping model, the latter is made from soft wood (linden, aspen). After the end of processing, it is covered successively with 3-4 layers of parquet varnish and then polished. Before vacuuming, it is useful to lubricate the surface of the model with machine oil to improve the molding process and simplify the removal of the stamped film.

It should be noted that the bodies for highway vehicles are by no means all that the proposed vacuum "press" can be made. Household items, parts of ship and car models, up to the largest ones, design elements of radio equipment and much more - this is the range of possibilities of such a technology.

Author: I.Vorobiev

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