The actual unfolding length of a sheet metal part is often the sum of its straight-line length and neutral layer length. For the calculation of the length of the neutral layer, the type and thickness of its own materials shall be fully considered, including external factors such as the mold used for processing. Because the processing of sheet metal parts is completed according to the corresponding mold, the bending radius is also equivalent to the size of the mold.

Therefore, on the premise of no special requirements, the bending radius can be calculated by substituting the size equivalent to the die, while the actual bending radius is not paid too much attention. In the actual production process of sheet metal parts, the corresponding bending compensation value is often difficult to predict in advance. Therefore, the bending compensation value of a specific material must be obtained by means of test bending. In this operation, first, the machine tool is used to cut two square materials of equal size from specific metal materials as test samples.

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