What is the vacuum table? » Articles » PRINCIPLE OF OPERATION VACUUM TABLE



Vacuum consolidation involves creating a vacuum between the workpiece and machine table. In this case the whole piece works clamping force equal to atmospheric pressure, which under normal conditions is equal to 760 mm Hg, which is about 1 kg/cm2. That is, the plate size 100x100 mm to the pressure of work, equal to 100 kg/p. In most cases, this allows the processing of a common tool in the normal mode. In this case the pressure of determined by the difference between atmospheric pressure and the pressure under the bearing surface, thus increasing the degree of vacuum of more than 95% becomes meaningless, the pressure of will grow at hundredths or thousandths of a percent. Consequently, for fasteners vacuum systems do not require vacuum pumps, creating quite a high vacuum. In principle, negative pressure between the workpiece and the supporting surface can be created in two different ways:

  1. Creating a set of sealed chambers in which the vacuum is created. In this case, the vacuum pump only works in theory to create the initial vacuum.
  2. The use of porous material. In this case, sucking air from the mass of material is continuous.

Vacuum Grid Plates

The product is pressed against the surface of the table due to dilution within the closed loop formed by the tight cord packed into the grooves of the lattice table. For the leaf pieces and body parts without the through-holes with a clean pressed against the surface treatment of Rz 1,6-2,5. Provides details of the precise positioning of the table and processing up to 30 microns for flatness.
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Vacuum grooved plates

The product is pressed against a smooth rubber mat with holes for sucking air through the grooves of the table. To consolidate the products with holes and / or cross-cutting milling / drilling for mounting many small items, including the presence of irregularities on the machined surface (up to Rz 6,3).
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Combined Vacuum Tables

Detail is pressed against the mat embossed with microscopic holes across the surface. For products of arbitrary shape with a through-hole and low-quality demands pressed against the surface. Allows for straight-through processing.
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Vacuum Porous Plates

The product is pressed against a smooth surface due to dilution in the micropores of the table. The deformation of workpiece is impossible, since there are no recesses or openings. For products with very thin walls (<1 mm, the final size depending on the material, as well as the foil is less than 0.1 mm thick), sheet metal blanks including of plastic materials (rubber, getinaks, varnished cloth, etc.), foil. The surface of the sintered metal is hard and has high resistance to wear.
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All of the above systems are typically modular structures, ie, by combining multiple support surfaces by means of special adapters may get a virtually unlimited field for securing items of any size. Thus, the technology has a wide selection of different options for mounting workpieces. No clear recommendations do not exist, but we have gained experience allows you to make some generalizations that will provide an effective return on these devices:

  • Vacuum system can dramatically ease the mounting process for mounting an entire class of products.
  • In most cases, at least one side of workpiece to be acceptable quality (do not have the bumps and protrusions more than 0.2-0.5 mm).
  • Cutting should be adjusted to reduce the forces directed parallel to the supporting surface (this applies only to the modes of a large pickup or to the processing of high-strength materials).
  • Adjusting for individual preparation, although results in the loss of time, can achieve much more secure fit.