Precision Tool & Die Stamping
Fineblanking Die Clearance & V-Ring Calculator
Compute ultra-precision fineblanking punch-to-die clearances (0.5% - 1.0% of sheet thickness), V-ring impinger tooth height, triple-action press tonnage, and 100% clean-shear edge parameters.
1. Input Parameters
Material strip thickness to be fineblanked.
Ultimate tensile strength of material (e.g. C45: 650, 16MnCr5: 580, Saph440: 440).
Total combined internal and external cut perimeter length.
Total length of the V-ring impinger bead enclosing the shear contour.
2. Calculation Results
Radial Clearance (c)
0.025 mm
V-Ring Height (h_v)
0.70 mm
Shearing Force (F_s)
24.2 kN
Total Press Capacity (F_tot)
45.8 kN
3. Geometric Visualizer
Tooling & Vector Prepress Engineering Notes
0.5% - 1.0% Radial Clearance: Standard stamping uses 8% to 15% clearance, producing 30% cut / 70% tear. Fineblanking maintains an ultra-tight clearance of 0.5% to 1.0% of strip thickness, enforcing hydrostatic compressive stresses that eliminate tensile tearing and achieve 100% clean burnished edge surfaces.
V-Ring Impinger Role: The 90° V-shaped tooth impinges into the scrap strip prior to punch entry, locking the metal in place and creating a lateral hydrostatic pressure field that prevents plastic draw-in from the scrap web.