bottoming die

• Bending Radius for Parts on a CNC Press Brake

  Apr 10, 2026

  When utilizing free bending, the bending radius is 0.156 times the die opening width. During the free bending process, the die opening width should be eight times the thickness of the metal material. For example, when forming low-carbon steel using a 1/2-inch die opening, the bending radius of the part will be approximately 0.078 inches. If the required bending radius is nearly as small as the material thickness, bottom bending (using a bottoming die) must be employed. However, the pressure required for bottom bending is approximately four times greater than that required for free bending.   If the required bending radius is smaller than the material thickness, a punch with a nose radius smaller than the material thickness must be used, and the coining method of bending must be applie...

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