Hi,
My question is that i make "traps" when i design sheetmetal parts, in order to have the true development.
I fit radius~0.1 and K~0.1 then i have the true development (with thickness<4). It is not true, because the radius is not ~0, it usually=thickness.
For major thickness, i look these parameters in our bend machine.
I know about bends tables, but it depends about the bend machine and i subcontract the parts in other factories.
Somebody knows how to handle these parameters??
THANKS
As a general rule the internal R will always be = to the material thickness! the subcontractor should use the correct tooling to achieve this, you can specify the bends but if they are to be non standard, maybee ask the subcontractor for there bend table , and a list of tooling
Ross
Not sure if this is a help, but you will find a good discussion on the topic of bend allowance here:
It helped dispel some of my confusion on the topic so it must be pretty good.
Thank you very much Derek,
It is very good¡¡ for me. One thing, i belive that the difficult is find the table of the bend allowance??is this right??
Is someone knows how to obtain it (not by trial)??
Thanks
It is a challenge to provide accurate flat patterns to multiple shops. They all have their own machines which result in different bend parameters. Best recommendation I can give is to talk to all of them an find out how they generate their flat patterns. Then you can create an "average" flat pattern. If you are lucky, this flat will be usable by some or all of the shops.
The alternative is to pass responsibility of the flat pattern development on to the contracted shop. You can create your flat pattern as a referrence for them. Give them the parameters you used (mat'l thickness, bend radius, k factor), but specify that it is reference only and the shop is responsible for the generation of the flat.
Not sure if this is a help, but you will find a good discussion on the topic of bend allowance here:
It helped dispel some of my confusion on the topic so it must be pretty good.
http://www.youtube.com/watch?v=rL3bjgcLW-4