Issue 30

C.J.Su et alii, Frattura ed Integrità Strutturale, 30 (2014) 502-514; DOI: 10.3221/IGF-ESIS.30.61 506 gear ring blank holder can also play a pressure side effect, but the effect of hydrostatic pressure is far better than that of the V shaped ring gear. In the fine blanking, the gear ring pressure is only one that is large enough to guarantee the materials hydrostatic pressure required in the shear zone. Fig. 5 shows the relationship between the gear form and a hydrostatic pressure distribution. As can be seen from the graph, the hydrostatic pressure generated by V - ring is the largest and advantageous to the sheet of plastic. (a) Before the blanking began (b) Ring gear is pressed into the sheet (c) Fine blanking 1/4 (d) Fine blanking 1/2 (e) Material fracture (f) Partial view Figure 3 : Fine blanking process simulation of ring gears with both sides (a) V shape (b) step shaped (c) cone gear form Figure 4 : The hydrostatic pressure distribution with different gear ring form.