parametro k calandratura

[vinci16]

hi to all, I have a question about the 'packing of sketch' of a sheet:
I am trying to figure out how the bending k parameter affects, in relation to the thickness and radius of the rolling.
to do all this not being present the function of displacement I have made a sheet using the special function and realized a sketch, that is a line placed in half-work to the sheet, and "played" with the values of 'turn angle' and 'raggiatura' until you get approximately the required sheet.
But at this point I find myself trying to figure out what the K parameter of the sheet function changes.
I hope I've explained my best.
greetings

Andrea

 

[MassiVonWeizen]

the factor k 0.5 means that development is done on the average thickness.
not being a real fold in the displacement it is generally held this value.
in the folds instead the factor k is due to many factors including: material, radius of the bending punch, bending quarry.. .
the factor k is not defined with calculations, but only through tests and relays. a particular made in s275 can stretch or withdraw if flattened with one equipment or another.
factor k below 0.5 the development sheet withdraws, factor k sorpa 0.5 the development sheet stretches
another way to have the correct development, knowing a priori the withdrawal/strength, is to use, instead of factor k, the option deduction bending in which the value given by thickness+thickness-retire (or +longing)

 

[PIETRO2002]

I think using the medium for development can be good for small thicknesses around 3 mm.
for larger thicknesses a k coefficient must be applied, which rightly depends on many factors, material, material status, equipment.. and if it falls in the direction of rolling or at 90° compared to it.
needs experience and possibly have created a database with old orders made.

 

[MassiVonWeizen]

pietro2002 I will tell you that even on small thicknesses you can have variations.
For example with the equipment where I work a 3mm s235 picks up well 0.7mm, thickness from 2mm 0.3 and you can not use a k 0.5 factor which is affected by the fold radius.

 

[PIETRO2002]

you are right, always better apply the exact coefficient k!

 

[MassiVonWeizen]

However in general, if the bending is made to an external supplier the best thing to do is do no development or do it with generic values (k 0.5 for example)
delivery of the drawing of the finished detail and the 3d (in this case it does not even need the development in the drawing) or the dxf (in this case the development serves, but will certainly be adapted) and let it be the supplier to make the correct development according to its parameters

 

[MassiVonWeizen]

@win the participation in the discussions that open at least to thank those who have dedicated their time

 

[vinci16]

@win the participation in the discussions that open at least to thank those who have dedicated their time

I'm sorry.
Thank you all for your advice.
? ?

 

[ilmirkino]

I speak for personal experience. when I was working in a company where frames for doors and doors for yachts were made, I had put down in the workshop a series of samples of various thicknesses (from 2 mm to 6 mm) and materials (aluminum, iron and stainless steel) and to everyone I had found the right "k". pieces with 4-5 folds. Ultimately, it is advisable to do tests for both thicknesses and one must treat both for the machinery and one has.