(Solved): a. A bending operation is performed on 5.00mm thick cold-rolled steel. Determine (a) the blank s ...

a. A bending operation is performed on $$5.00\mathrm{mm}$$ thick cold-rolled steel. Determine (a) the blank size required and (b) the bending force if the bend is performed in a Vdie with a die opening dimension $$=40\mathrm{mm}$$. The steel has a tensile strength $$=350\mathrm{MPa}$$ and shear strength $$=250$$ MPa. Use dimensions in a drawing below. b. Let $$\mathrm{n}=0.5$$ and $$\mathrm{C}=500$$ in the Taylor equation for tool wear. What is the percent increase in tool life if the cutting speed is reduced by (a) $$30\%$$ and (b) 60\%? c. Assume that, in orthogonal cutting, the rake angle is 20 and the friction angle is 35 at the chip-tool interface. Determine the percentage change in chip thickness when the friction angle becomes 45 . Use Merchant's equation.