Re: K-FACTOR/BEND ALLOWANCE

Дата публикации: 21-01-2020 17:01:17

?
First mistake = you gave a flat pattern to an outside company..
Second mistake = you assumed Inventors data was correct.
 
K factors MUST be determined for each machine/process/bend radius you intend to use. There is no "one size fits all" value. 
A sheet metal company should be given the drawing showing the part in the "as formed" state and its their job to calculate the flat pattern given their known bend allowances,etc... There are very few if any cases where you should provide a flat pattern to an outside company. If they aren't capable of determining the flat pattern size then find another sheet metal vendor as they are not qualified to be one. 
 
If you are making the parts in house then you must determine accurate kfactors to use. We do that by actually bending a sample and then calculating the correct k factor given the flat length and then entering the lengths of the as formed legs. (There is software to calculate that for you)..
I have a table of every material we bend and the die radius and v dies being used. But when I provide a drawing to our sheet metal vendor is the "as formed" drawing/views only.. 
 

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