We are designing Helix Staircase with Helix Glass Guardrail.We would like to open bending glass parts for manufacturing.But We need K value for glass.
if I understand you properly, you wish to use the sheet metal functions to create bent glass elements?
The K-factor (or any bend allowance) to my understanding usually helps predict the amount of stretching/compressing the material will do on a press break under great stress. A cold forming method. Calculating the correct K-factor value for your CAD system
Though I'd love to see glass being cold formed, I'm thinking it will be heated until it is readily formable without much/any stress. So a K-Factor would be difficult to determine, I'd start with 0.5
Are you manufacturing the glass parts? or is this being out-sourced? If you're out-sourcing I'd be inclined not to provide a lay-flat and allow them to do the calculations on their own. If you're doing it in-house, the knowledge must be there somewhere already?
Thanks for informations.Im not manufacturing glass.Im buying from glass manufacturer.They need opened curved glass dimensions and diameters.I must give those drawings.Whats your opinion if ı accept 0.5 k value?
What is the bend radius of the glass?
Outside Diameter 2415mm. İnside Diameter 605mm.
I'd be inclined to do some tests on a few variations of the K factor and see what the difference is in the flat length of the part. With such a large radius I'd expect a K factor 0.5 to be pretty reliable. But really your supplier should know what they're doing and be doing these calculations for you.
What are the tolerances on the design (my guess is not particularly tight).
Give them the finished form dimensions (they should be able to figure out the rest)
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K factor depends on many things. It depends on the machine, material, operator, thickness etc...
My suggestion is create a simple bending part in SW and talk with your supplier and want them to do it.
Then compare the results for real bending and SW. Try some K factor values for reaching the real dimensions
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