How to calculate the bending force in the production of metal stamping parts

Bending force is an important basis for designing metal stamping die and selecting press tonnage. The size of the bending force is not only related to the size of the blank, the mechanical properties of the material, the distance between the fulcrums of the die, the bending radius, and the gap of the metal stamping die, but also has a great relationship with the bending method. Therefore, it is very difficult and complicated to calculate the bending force theoretically, and the calculation accuracy is not high. In production, the following empirical formula is usually used to calculate the V-shaped bending force. In the formula, F is the bending force when bending freely from the V shape (N); b is the width of the bending part (mm); r is the inner bending radius of the bending part (mm); Rm is the tensile strength of the metal stamping material (MPa), 08F The Rm of steel is 280～390MPa; the safety factor of k is generally ku003d1～1.3; the thickness of t sheet material. 1) Two 90° bends with a width of 10mm are substituted into equation (4-1) to obtain 2) A 127° bend with a width of 24mm in the middle is substituted into equation (4-1), and the total bending force of the part is F from u003d F From 1+F to 2u003d4.66kN+5.59kNu003d10.25kN. According to the calculated total pressure and combined with the existing press installation space of the metal stamping parts factory, a 250kN open press is selected. Recommended article: Process layout design in stamping parts processing Previous: Introduction to U-shaped part bending die in stamping parts processing plant