Press brake bend length 0 010 0 25mm per bend for controlled dimension.
Bend angle tolerance sheet metal.
What determines an air bent bend angle is the relationship between the width of the die opening and the depth of penetration into the die space.
Bending is a process whereby a force is applied to sheet metal which causes it to bend at an angle and form the desired shape.
Bending is performed by a press brake machine that can be automatically or manually loaded.
Bends can be short or long depending on what the design requires.
The formed bend radius is dependent upon the dies used the material properties and the material thickness.
The metals industry typically does a great job of controlling metal specs.
Folder bend length 0 010 0 25mm per bend for controlled dimension.
However minor differences from coil to coil and from the beginning of the coil to the end are possible.
Geometry of tooling imposes a minimum bend dimension.
Use the minimum bend dimension values in the charts below for your minimum closeness of cutout to a bend.
After bending the sheet we need to do some measurements as shown in figure 2.
We will start by calculating the bend allowance.
The key to successful tight tolerance bend angle control is to design the die so that it can be easily quickly and safely adjusted within the boundaries of the press.
When sheet metal is bent it stretches in length.
The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.
The diagram shows one such mechanism.
Bend length 0 010 0 25mm.
The main reason different die angles exist in air bending is not to bend different angles but instead to allow the punch to descend far enough into the die space to overbend for springback.
The sheet metal bending height should be at least 2 times the thickness of the sheet metal plus the bending radius that is h 2t r.
Bend angle 1 degree.
The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend.
The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length.
Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees.
