Brake Press Forming Problem
Brake Press Forming Problem
(OP)
Hey can anybody help me with some forming issues. We are trying to form some 1/2 plate and no matter what we do it cracks. The only thing that seems to work is grinding out the stress point before forming. Is there a specific way to avoid the cracking all together? If anybody can help I would greatly appreciate it. Pictures will be coming soon.





RE: Brake Press Forming Problem
Angle?
alloy?
http://www.thefabricator.com/article/bending/bendi...
RE: Brake Press Forming Problem
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RE: Brake Press Forming Problem
RE: Brake Press Forming Problem
RE: Brake Press Forming Problem
RE: Brake Press Forming Problem
RE: Brake Press Forming Problem
RE: Brake Press Forming Problem
Mcgyvr has given you the best start, you are trying to form at too tight an inside radius. The guidelines I have used, are, that except for very soft metals plate, should have a " Minimum" inside radius of the thickness if the metal. As you well know changing the inside radius will affect the developed length of your part and will require a new flat pattern. If you absolutely have to bend at that radius then I would suggest hot forming the part. Heat to cherry red with a blowtorch then bend. Your dies looked like they were part of an expensive set, either use an older set of dies or use protective disposable steel shims to protect your dies.
B.E.
You are judged not by what you know, but by what you can do.
RE: Brake Press Forming Problem
Increase the inside radius of the bend. Grind the two rough edges as you did, parallel to the plane of the plate, and grind a slight radius on the corners of those edges, rather than leaving very sharp corners. Finally, cut the blanks from the piece of plate in such a way that the rolling grain of the material runs across the bend, rather than along the bend. Finally, heat the plate.