Often, there are so many scraps of paper or cardboard left behind from repeated efforts to shim the die to achieve a consistent angle that their shop looks like an elementary school craft project went awry.
The reason for this is that any time you are bending a part over four feet long on a press brake that part is susceptible to deflection. A result of uneven downward pressure combined with slight nuances built into the machine itself, deflection occurs when more tonnage is applied to the ends of the beams than in the centre. This causes the angle of the bend to be tighter on the left and right and less so in the middle, creating a bow in the bend angle.
Read the full article in SHOP Metalworking Technology.
September 25, 2018