table rays fold / factor k

[ddn]

Hello, I know that the topic is ancient but...some of you use the table of bending/factor k rays?
to achieve the correct development, I insert the fold radius from time to time, depending on the sheet thickness.
the system works well, the only problem is that the actual radius of the realized piece is always less than I imposed.
the dieped pieces are made c/or thirds, so I do not have the possibility to determine the k factor experimentally.
we use simple fe370 decapated sheet.

I attach my table.

 

[Mike1967]

I also attach mine, but as already said several times, it is not the "norma"
Universal... we arrived by sampling all the thicknesses, materials and matrices... a huge job.
below the thicknesses and materials we use most frequently.

about bent rays, I'm not mad, I'm imposed
those that do not create problems of exhaust and various bales, up to 3 mm thick imposed r 0.01 mm... is a subterfuge to avoid automatic discharges
improbable at the counter, especially on pieces to be soldered and satin.
for rays, instead, particular, design them as they must be in reality and use the value of 0.5 factor k.
for folds at 180° factor k 0.625

 

[meccanicamg]

Good evening to both of you. I would say that the folding tables can be done only and exclusively by doing an adequate test campaign with the die-foot with different angles and materials/thicknesses. then changes a lot depending on the equipment used.
therefore are valid all and nobody unless you have the same material and equipment

 

[controllofiamma]

hello to all
I am brand new of the round, in my case I set to 0.8 the bending radius (route of the bending punch) and to 0.18 the k factor for all thicknesses from 1 to 8 mm fe 420.
the result is highly satisfactory.

 

[controllofiamma]

Excuse me, but do you bend it in the air or coniatura?

 

[Marco74]

I think we can stay talking about it for a week, but the topic is hostical, we in the company have made many tests to find the actual collection values of folds at 45°, 60° and 90°, and everything works excellently. we use solid edge in the formulas for the calculation of the retreats, we made a custom table with rays and retreats, the rays are theoretical taken from a table of standard quarries, they will never be real since they depend besides the quarry also from the knife used by the type of material etc...etc..

 

[ddn]

hello to all
I am brand new of the round, in my case I set to 0.8 the bending radius (route of the bending punch) and to 0.18 the k factor for all thicknesses from 1 to 8 mm fe 420.
the result is highly satisfactory.

in fact I tried with your values and it works well, there are few tenths of difference with my method.

 

[ddn]

I think we can stay talking about it for a week, but the topic is hostical, we in the company have made many tests to find the actual collection values of folds at 45°, 60° and 90°, and everything works excellently. we use solid edge in the formulas for the calculation of the retreats, we made a custom table with rays and retreats, the rays are theoretical taken from a table of standard quarries, they will never be real since they depend besides the quarry also from the knife used by the type of material etc...etc..

Can you see your table?

 

[Marco74]

Can you see your table?

I'm sorry, I'd gladly show you, but I can't.