Punching Sheet Metal Thickness

This is because the stripping action of the punch coming out of thin materials causes the sheet metal to deform.

Punching sheet metal thickness.

Typically ironworkers are used for thicknesses greater than 1 8. And the type of metal being punched harder metals are more difficult to punch. Perimeter 20 4 80mm. 82 728 kn 9 81 8 43 ton.

In fact we only use this machine in cases of very small lot sizes or when a part is already welded together. You will see from our cnc punch tooling tables that we have a range of die clearances to cover sheet metal materials from 0 4mm thick up to 5 0mm thick. For example when punching a round hole it is generally recommended that the minimum diameter of the hole should be larger than the thickness of the metal. Most of the sheet metal cutting processes discussed can be performed.

The punch force required to punch a piece of sheet metal can be estimated from the following equation. Punch force kn 80 x 3 x 0 3447 82 728 kn convert into tonnage. Sheet metal punching via ironworker is a slow process. If punching one square hole in the 3mm thickness low carbon steel plate side length 20mm you will get.

Also watch out for punch deflection especially if you re working with small hole diameter to material thickness ratios. 1 2893 7 3 2812 7 1 2 2576 6 5 2656 6 7 3 2391 6 1 2294 5 8 2500 6 4 4 2242 5 7. 2 to 1 for stainless 1 to 1 for carbon steel 0 75 to 1 for aluminum. When considering sheet metal thickness a single sheet with punches holes is a good rule of thumb.

Gauge sheet steel. Shear strength 0 3447kn mm 2. A deflecting punch requires more tonnage to break through the material and again increases distortion. F 0 7 t l u t s displaystyle f 0 7tl uts where t is the sheet metal thickness l is the total length sheared perimeter of the shape and uts is the ultimate tensile strength of the material.

Generally capabilities of of 0 9mm 20mm in thickness are able to be manufactured from sheet 3mm or plate 3mm but this tolerance depends mainly on the part. The die clearance ideally increases as thicker sheet metal is punched but in practice some standard dies can be used for a range of materials.