How to select the size of the lower V groove for sheet metal bending according to the plate thickness

Sheet: 1-3mm, the groove selection rule is 4-6 times of the material thickness.
Thick plate: 4-10mm, the groove selection rule is 8-10 times of the material thickness
The smaller the groove width, the smaller the R angle after folding, and the greater the bending pressure is required. The larger the groove width is, the larger the R angle is, and the bending pressure is required to be relatively small.
It is selected according to the tonnage and product processing requirements of the selected press brake machine, which is only industry experience rather than industry standard.

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