theKbStockpiler
Samba Member
Joined: July 07, 2012
Photos: 46
Location: Rust Belt
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| Sheet Metal Forming Diagram |
Posted: Sun Jan 13, 2019 7:33 am Views: 50
Rating: Not rated
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This is a image for thread but I'll post the text for it here as well if it fits.
If two bends exist on the same panel and they try to occupy the same area they will conflict because either shrinking or stretching is required. This is what happens when making a dome is attempted. You can try this with just a sheet of paper by bending the opposite sides on both the top/bottom and right/left at the same time. There is excess material created because the edges are getting closer together.
If the outer circumference is shrunk down as the lip is bent all is well and that is the only change of shape the panel will incur. However if the outside is not shrunk the panel will bow along where the bend occurs on the part that we want to be flat. This does not happen with the first part bent down because the extra material is not forced against other (competing) metal build up.Once there are two bends forcing their excess metal against each other ,it will either shrink some, buckle or bow the part we want to stay flat. |
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