In the process of the metal sheet under the downward pressure of the die on the bending machine, the bending surface of the sheet metal will move smoothly along the exposed surface of the molding insert. The bending surface of the metal sheet metal does not contact the metal part of the lower die directly, so as to achieve the purpose of no indentation on the surface of the bending part of the workpiece. Therefore, greatly improve the quality of sheet metal bending products.<br>
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