niuo-faq-lamiere

Sheet Metal Design Guide

Guidelines, formats, and useful tips for designing your files

For your projects you can choose a wide range of materials, which you can find on the dedicated page, and finishes, which can also be consulted on their dedicated page

11,52345
AISI 304 steelVVVVVV
AISI 316 steelVVVVVV
S235JR – Fe360 BVVVVVV
TITANIUM Gr.2 – ASTM F67V
GALVANIZED STEEL DX51D+Z – Fe P02GVVVVVV
COPPERV
ALUMINUM – 5754H111VVV

The maximum dimensions that can be worked are 2000×2500 mm, but we can also evaluatesolutions for larger dimensions. Make your request by sharing your project and sending us an RFQ!

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Bend radius

The bending radius must always be set according to the thickness of the sheet metal – with a radius smaller than the thickness, sheet metal production is impossible. Generally, therefore, the internal bending radius must be equal to the thickness of the sheet metal.

It is always advisable to consult the bending tables.

Short edge

immagine che descrive la piegatura a bordo corto

The bend edge must have a minimum length, because if it is too short, the bend is unfeasible. It is therefore necessary to take this aspect into account.

Given t the thickness of the sheet, the minimum dimensions of the edge b are generally calculated as:

B=4*T+2mm

It is always advisable to consult the bending tables.

Variable edge

illustrazione che rappresenta la piegatura della lamiera a bordo variabile

In bend edges that have variable length, the minimum bend edge size condition must be met by the shortest edge in the bend. Otherwise, unwanted deformation may occur during bending.

It is always advisable to consult the bending tables.

Consecutive bends

illustrazione che rappresenta piegatura consecutiva della lamiera

Even when there are consecutive bends, attention must be paid to the minimum size of the bend edge, as otherwise bending would not be feasible.

It is always recommended to consult the folding table.

Folding table

illustrazione di una lamiera piegata
t11,52345
b6810141822
Ir122345

As the thickness of the sheet metal varies, there will be different minimum values for internal radius and edge length.

Folding support

illustrazione lamiera che rappresenta il supporto alla piegatura
When the bend does not affect the entire length of the edge, it is a good idea to unload near the bend to be made in order to avoid any unwanted deformation of the material, thus facilitating processing.

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Position of holes and cuts

Holes and cuts near bends are not recommended. They may deform undesirably. To avoid this situation, simply place the holes or cuts at a distance greater than or equal to the minimum recommended distance for the edge.

Diameter of holes

The diameter of the holes must be greater than or equal to the thickness of the sheet metal.

Hole Spacing

The distance between the holes must be greater than or equal to the thickness of the metal sheet.

Threading and countersinking

To have threaded or countersunk holes in your project, simply indicate the latter in the additional files that can be attached at the time of the request or in the notes.

Regarding the THREAD, in the 3D models there must be guide holes in correspondence with each threaded hole but not the threads. You can consult the table below for dimensional references in relation to the type of thread. In addition, a file with the information relating to the thread must be attached.

The realization of any threads must in any case be evaluated on the basis of the specific project requested.

Threading and countersinking table

Fillet M3 M4M5 M6 M8 M10 M12 M14 M16
Bore diameter Ø 2.5 3.3 4.2 5.0 6.8 8.5 10.2 12.6 14.0

Similarly, for SHAZING in 3D models, the main hole must be present but not the chamfers.

Perpendicular Cutting

illustrazione taglio perpendicolare

The cuts in the files must always and exclusively be perpendicular to the plane of the sheet metal.

Engraving of characters and logos

illustrazione che rappresenta incisione dei loghi
During the design it is good practice to take into account the cuts that will be made. Pay close attention to extra cuts and any unconnected sheet metal parts.

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The general tolerances observed for sheet metal processing are ISO 2768 – v.

The table shows some tolerance references related to thickness.

Thickness (mm)Fold tolerance (mm +/-)Cutting tolerance (mm +/-)
10,5 0,5
1,5 0,6 0,6
2 0,7 0,5
3 1,00 0,5
41,5 0,5
5 1,60,5

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You can use CAD files in different formats, but the recommended one is the STEP format. In addition, you can upload additional files that are necessary and support the project in various formats (PDF, DWG, DXF and others)

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Tolerances in another document

illustrazione che spiega le tolleranze

Tolerances must be indicated in a separately attached PDF document.

Features

Any specification regarding the treatment of the surface of the sheet metal must be placed in the comments section.

One drawing, one part

illustrazione che spiega le tolleranze

A single drawing must be contained in a single file. Therefore, avoid multiple parts in a single file.

Tidy design

illustrazione disegno ordinato

Only the cutting lines must be present in the final file. Therefore, do not specify tolerances, dimensions, construction or bending lines.

Cutoff views

illustrazione lamiera

Avoid interrupt views or sections: the software will not recognize the sheet metal in its entirety.

Open or broken lines

illustrazione piegatura lamiera
Make sure that all lines are closed. Spline CurvesAvoid these types of curves as they could cause various problems with the system. Overlapping curvesBefore closing the file, check that there are no overlapping curves that could lead the computer to make extra or unwanted cuts.

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