Punching Sheet Metal Thickness

2 to 1 for stainless 1 to 1 for carbon steel 0 75 to 1 for aluminum.

Punching sheet metal thickness.

The punch force required to punch a piece of sheet metal can be estimated from the following equation. If punching one square hole in the 3mm thickness low carbon steel plate side length 20mm you will get. 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. One of the most mature technologies in metal fabrication punching is also one of the most misunderstood perhaps because the process can ccomplish so much punch myriad shapes form even bend flanges.

Shear strength 0 3447kn mm 2. Also watch out for punch deflection especially if you re working with small hole diameter to material thickness ratios. 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. 82 728 kn 9 81 8 43 ton.

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. A deflecting punch requires more tonnage to break through the material and again increases distortion. Regardless if a shop follows some basic strategies it will be well on its way to better parts and greater throughput. Punch force kn 80 x 3 x 0 3447 82 728 kn convert into tonnage.