Perforated sheets made by punching, drilling and waterjet cut, embossed plates, expanded metals in many different materials such as steel, stainless steel, aluminium, brass, copper, titanium, wood, plastic, glass, etc. From 0,1 mm up to 200 mm thickness.
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 2000x6000 with 1 perforated area. up to
2000x8000 with 2 perforated areas. Standard: 1000x2000, 1250x2500 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.
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Staggered hole parallel to long side Staggered holes parallel to short side
ORIENTATION OF PITCH
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Pitch parallèl to long side (std) Pitch parallel to short side
STEP PERFORATION
without margins Margins on long side
Margins on short side Margins on 4 sides
Sheet with many perforated areas
Step Perforation
A,B represent a step punching with different types of
perforations
C,D Show
perforations without unperforated areas
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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