1. Edge of the workpiece after bending small round, radius, no refraction by the bending process, the edge of the workpiece after bending arc radius and was bending workpiece, the thickness of the proportional relation of sheet metal on the material, after a v-shaped slot of remaining sheet thickness is only half of the original sheet thickness, even smaller, so that when the bending edge of workpiece circular arc radius and multiplying decrease proportionately. And because the v-shaped groove after the remaining plate thickness is small, bending deformation force is small, will not diffuse to affect the unbending area, so the bending of the surface of the metal sheet without refraction. In this way, the hotel, restaurant, restaurant, commercial building, bank, airport and other places in the high-grade decoration of the special requirements.
2. Needed to reduce the sheet metal bending bending force of bending process, the sheet metal bending force and the bending of sheet metal work piece thickness is directly proportional relationship, before bending of sheet metal after a v-shaped slot, makes the rest of the sheet thickness is about half of the original sheet thickness, or less, so that the bending force of sheet metal bending need also decreases, and accordingly makes long sheet metal bending machine in small tonnage also be able to bend. It can reduce equipment investment and save energy.