Psi Required To Punch Through A Sheet Of Aluminum

The formula is perimeter times thickness times shear.

Psi required to punch through a sheet of aluminum. Sheet rb 40 000 276 80 25 astm a 36 bhn 119 159 58 80 000 1 20 20 25 45 50 carbon hr sheet bhn 200 80 000 552 1 60 25. To 3 16 in you can drill through most metals at 3 000 rpm. Figures in the body of this chart are u s. Tonnage in mild steel 3 1416 x diameter of hole x material thickness x 25 example.

Punching force calculation formula. Recommended die clearance in of thickness low carbon hr steel rb 70 50 000 345 1 00 20 low carbon c r. You can calculate the punching tonnage been required with the help of the following punching force calculation formula blanking force formula. Hard metals like steel and larger drill bits require even slower speeds.

Multiply x 1 60 a36 steel recycled. The shear strength is 350 mn m 2. To calculate the force to punch holes in metal you determine the cross section in shear and multiply it by the shear strength of the metal. Shear strength n mm 2.

Tonnage required for punching round holes. Thirty tons being the approximate shear strength of mild steel plus an allowance for friction. Multiply x 52 high carbon steel. Multiply x 70 copper 1 2 hard.

Multiply x 36 brass 1 4 hard. As this happens you gain a small amount of total length in your part. With a small twist bit 1 16 in. Required tonnage for punching mild steel with tensile strength of 50 000 psi how to calculate required tonnage for punching mild steel with tensile strength of 65 000 psi how to calculate the diagonal dimension of a punch.

Likewise when you are trying to develop a flat pattern you will have to make a deduction from your desired part size to get the correct flat size. In general it s a good idea to drill through metal using as slow a speed as possible using a drill bit for metal. Multiply x 1 25 stainless steel. When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched.

If you punch round holes or square holes or some other forms of holes through a given thickness of metal you just want to know the force required to punch a hole in steel. How to obtain tonnage required for punching round holes. To calculate the tons needed for other metals just multiply number times the tons required for punching mild steel. 3 1416 x 2 000 x 250 x 25 39 26 tons.