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Hi machid,
When you assign a material to the sheetmetal part, Pro/E takes the bend allowance info from the material.
You can change the Y Factor or assign a Bend Table by editing the material (File > Properties > Material: Change) that is assigned to the part (Micellaneous tab > Sheetmetal Properties).
Use K-factor only if possible. I know of no other software that uses Y-factor except Pro-E, Why? You can dervie the dang Y-factor if necessary from the K value. An old good rule of thumb value for K is .36 to .45 & will cover most any carbon stl form & has been in use for decades. .4 is preferred, but .5 is Simply not possible. Edited by: MarkEngr
There is no set in stone number or rule of thumb to use for K Factory or Y factor or any bend allowance. Many factors play into this value: The type of sheetmetal you use (Carbon Content and what not), your machines and dies, tooling radii, do you airbend or coin the material. Someone already explained how to modify it, either in the material property itself or while you are creating your flange, you can goto the Bend allowance tab on top (ProE calls this the dashboard) to set this for each individual bend. In order to get your bend allowance, you will need to measure some sheets before bending then after bending and use those results to calculate the allowances. As stated above, I mostly worked with figuring the Y-Factors, 0.5 is what it is defaulted to, but that is in no way possible to achieve in the real world. All this allowance does is tell ProE where the "actual" neutral bending line is through the bend, so when it flattens the part, it knows how large to make the deformed area (the bend of the metal). No matter what you set this to, it doesn't effect your formed part, unless you start with a flat part and add bend lines (I don't recommend making parts like this as redefining them down the road will be more painstaking). The only time you see the bend allowance taken into effect is when you flatten your bend, which is very important so you know you have the correct flat state being burned on the laser or whatever. In a perfect world it would be right down the middle of the material thickness but that never happens.
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