INSTEAD OF THE PRESS – VACUUM

INSTEAD OF THE PRESS - VACUUMWork on the body EN-route car-copies were never easy. Athletes developed a number of technologies with the use of foams, plastics, paper, cardboard and wikileak made of fiberglass. However, each has any flaws. This can be increased the complexity of the process or poor prochnosti-weight characteristics of the finished product.
Today we offer to your attention a technology of forming thin shells of the bodies that has been tested on syut city of Slobodskoy, Kirov region headed by I. Vorobyov. This technique, using the hood of a plastic film by vacuum after heating, allows after not too time-consuming operations for the preparation of devices “stamp” body for a few minutes. In addition, due to selection of source material (film) at the same time manages to solve most prochnosti and weight problems when opening the box.
 
The idea of a vacuum is not new, but the modelers it is almost never used. But in vain! Once is enough to see the result obtained by such a method as will become clear — not achieved with any other. The quality of the reproduction of the form of the film body fully depends on the quality of manufacture of the original model (if not using ready microcomputers, factory or homemade!), and the gain in mass compared to durable cardboard option — a nine-time!
Fixture for vacuum forming.
Fixture for vacuum forming:
1 — elements of the finished screw clamp, 2 — frame (wood), 3 seals (frame from a sheet of microporous rubber), 4 — plate stock, 5 — wall of the vacuum chamber (steel sheet with thickness of 5 mm) 6 — spacer (plywood 10mm), 7 — strut (steel, brass), 8 — foot, 9 — fitting (Bicycle), 10 — М5Х20 screws (30 PCs.).

 
Special explanation the device for the vacuum molding is not required. It is only necessary to note that the vacuum chamber with a base connected tightly, greasing all the joints with glue of type “Moment”. A wooden frame assembled from suitable bars or parts from worn out chess boards, pasted on the same sheet of microporous binder rubber (one box — both sides, the second with only one). Heating of the film in contrast to the method using face kilowatt capacity, is made with hot water, which gives additional benefits: eliminates overheating to the fragility of thin plastic, simplifies the operation, increases safety. To create vacuum you can use school vacuum pump or a compressor, to the suction channel which connects to the hose molding device.
 
Sequence of operations for stamping.
The sequence of operations forming:
I — pre-reverse stamping for the formation of the “bath” of the film blanks, II — a revolution of the workpiece and fixture Assembly for a basic stamping III — basic punching (for example, the body EN-route to the car).
The sequence of operations shown in the figures. The first stage (reverse stamping) allows you to simultaneously test the reliability of the whole system and the ability to deform the sample film. Education intermediate drawing (“bath”) provides an opportunity not only to use a higher model body, but also improves the basic process of forming, reduces the likelihood of creases and breaks. When failed samples of a sheet material can be used again, thus straightening them in a metal cell due to the heating of hot water.
 
If it is not possible to use a ready sample of the body as a punching model, the last made from soft wood (Linden, aspen). After processing it is covered consistently 3-4 layers of parquet lacquer and then polished. Before vacuuming the surface of the model it is useful to lubricate with lubricating oil to improve the molding process and facilitate the removal of the stamped film.
 
Note that the body for the medical and rescue cars are not all that allows you to make offer vacuum press. Household items, items, ship and car models, up to the largest, design elements, radio and more — that range of possibilities of this technology.
 
I. VOROBYOV

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