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Perforated Sheets

Our company stands out for customized perforation of various types of sheets.
Herewith we indicate the main and needed information for an offer. Our Production method is the sectional perforation.

THE SECTIONAL PERFORATION


In the sectional perforation the presses are equipped with tools which do not cover the whole width of the sheet to be punched; the sheet is therefore perforated in multiple passes.

MATERIAL AND CARATTERISTICS OF THE SHEETS


Materials
 | We can work many kinds of materials, among them carbon steel, stainless steel (304, 316, etc..), aluminium, copper, brass, bronze, titanium, plastic, ect.

Thickness
| From 0,025 to 30 mm, depending on the material and type of perforation.

Dimensions | On customer’s request and standard sized. Customized: up to 2000×6000 with 1 perforated area. up to 2000×8000 with 2 perforated areas. Standard: 1000×2000, 1250×2500 and 1500x3000mm.

Certifications
| We can provide chemical analysis and mechanical tests certificates on customer’s request.

TYPE OF HOLES

We can realize different types of holes, among them round holes, square holes, oblong holes, rectangular holes, triangular holes, hexagonal holes, ornamental holes, patch key holes, flared holes, bridge holes, pocket holes,rasp holes, etc. (see pict. below) in various dimensions.
Other kinds of perforations can be carried out on request by making specialtools.
At the present time our company has more than 11 thousand different moulds.
ARRANGEMENT OF THE HOLES

These are the main arrangements of perforation; they are not used for all types of holes and some of them are more common than others.

ORIENTATION OF PERFORATION

The orientation of perforation is the arrangement of the hole with respect to the side of a plate. In some cases the orientation of the holes may affect the performance of the perforated plates.

ORIENTATION OF PITCH

STEP PERFORATION

 

 

CAMBER, FLATNESS AND HOLE DEVIATIONS

The punching and the levelling processes of a metal sheet may cause a deviation of a side edge from a straight line; it occurs especially when the unperforated margins are parallel to the direction of perforation and have different widths; this effect is called “edge bow” or “camber”.

The tension generated during perforation may cause flatness defects along the unperforated margins ( wavy edges), especially when these ones are quite wide. This kind of deformation is however eliminated or reduced by levelling the sheets after punching.

It is always advisable to specify the requested tolerances before placing an order.

Perforated plates manufactured with sectional presses may show light differences in the hole pitch between one pass and the other (see the pict. on the left); these hole deviations, which are neither continuous along the sheet nor predictable, occur in case of different perforations and are caused by the strong tensions and deformations to which the metal is submitted.

TOLERANCES

Tolerance on dimensions like hole diameter, unperforated margins, sheet size and flatness may vary according to the application of the finished product.

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