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If the thickness of the board is 1.2, deduct 2mm from one bend, deduct 2.36mm from one bend, deduct 2.0 from one bend, deduct 3.35mm from one bend, deduct 2.5 from one bend, and deduct 4.2m from one bend, then use this method to remove the skin. If the accuracy requirement is not high, add up all the external forming dimensions of the parts that need to be bent, and the number of bends (90 degrees) will be reduced by multiples of the coefficient. If the accuracy requirement is high, you need to actually calculate this coefficient, because most of the boards now have a lower deviation, and the V-shaped opening size of the lower mold of different bending machines is also different. The method for calculating the coefficient is to take a 200 wide board, take one piece of each thickness, fold 10 bends on it, measure the size of each bend, add up all the dimensions, and divide the difference from 200mm by 10. It’s just the coefficient of a bend.
Each time it is folded, it is several millimeters larger than the actual size. It is correct to measure the distance between the material and the mold with a ruler. The reason for this is that bending the sheet metal is actually a stretching process, and the outer wall of the sheet metal is actually lengthened after bending, resulting in a bending coefficient. For example, the bending deduction for a 0.8mm thick iron plate is 1.5. For example, for a cold-rolled plate with a unfolded length of 100mm, if it is 0.8mm thick and bent by 20, the actual bending result is 81.5. Bending deduction is a trial, and the bending coefficient varies depending on the upper and lower molds of the bending machine. Fixed length method; First, subtract half of the coefficient from the center of the bottom mold slot to the front dimension, and this is the zeroing dimension. Using this zeroing size and the size you want to bend, the final size is determined. The method of testing the bending coefficient is to first cut a piece of material with a specified thickness, 100mm wide, and bend it by 40 degrees,. Measure two bends with a caliper, add the dimensions of the two bends together and subtract 100mm to obtain the bending deduction for this type of board. Also, pay attention to the thickness of the folded material and the size of the bottom groove, which must be clear.