The function of the V-shaped gear ring pressing plate is:
- 1. Prevent materials outside the shearing zone from flowing with the punch after shearing;
- 2. Clamp the material, so that the material is always perpendicular to the punching direction without tilting during the fine blanking process;
- 3. Provide strong pressure, establish a three-way compressive stress state in the deformation zone, eliminate or prevent cracks caused by tensile stress, and prevent tearing of the cut surface.
In order to ensure the shear quality of stamping parts, reduce power consumption and increase the service life of the mold, the blank holder force must be calculated and set correctly. If the blank holder force is too small, the hydrostatic stress of the material in the deformation zone is low, which is not conducive to cracking. Tearing occurs on the shear surface, which affects the quality of the shear surface.
If the blank holder force is too large, excessive power consumption will be generated, the mold structure will be complicated, and the service life of the mold will be reduced. Therefore, in the actual process, the blank holder force must be adjusted.
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