Bending SS316 Thickness 3.0 mm

I want to make die for bending SS 316 - 3.0 mm thick - laser cut - during shard right angle bend it crack. then we make it flame heat & in ok , but while heating , finishing get damage.

Now trying to make another die / optional arrangement like ... bending with HY ylinder etc.... but not sure.... trial-eror & improvement

Please give solution , to avoid trial & error

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