Punching Sheet Metal Thickness

A deflecting punch requires more tonnage to break through the material and again increases distortion.

Punching sheet metal thickness.

Shear strength 0 3447kn mm 2. Regardless if a shop follows some basic strategies it will be well on its way to better parts and greater throughput. 2 to 1 for stainless 1 to 1 for carbon steel 0 75 to 1 for aluminum. Perimeter 20 4 80mm.

When considering sheet metal thickness a single sheet with punches holes is a good rule of thumb. Also watch out for punch deflection especially if you re working with small hole diameter to material thickness ratios. 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. Punch force kn 80 x 3 x 0 3447 82 728 kn convert into tonnage.

The punch force required to punch a piece of sheet metal can be estimated from the following equation. 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. 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.