Assume that multiple features are to be punched into a blank

Assume that multiple features are to be punched into a blank, and that this blank is to be processed in very high volumes. Which one of the following statement is true? a) The punching processes will be carried out with a manually operated shear press in combination with multiple, general purpose punch and die sets b) The punching processes will be earned out with a CNC punch press in combination with multiple, general purpose punch and die sets stored in the tool magazine c) The punching processes will be carried out with a CNC punch press in combination with a compound punch and die set stored in the tool magazine d) The punching processes will be carried out with an automated, single stroke punch press in combination with a compound punch and die set e) The punching processes will be earned out with a manually operated shear press in combination with a transfer punch and die set The sheet metal part illustrated above left is bent using a press brake, punch, and die into the part illustrated above right. With regard to the manufacturability of this design, which one of the following statements is true? a) The part is well designed, and can be bent without quality problems b) The large central hole is too near the bend and will likely suffer shape distortion or edge cracking c) The two small holes near the end are too close to the edge and will like suffer shape distortion or edge cracking d) The large central hole is too far away from the two small holes, and will suffer shape distortion or edge cracking e) The part will suffer from permanent damage due to dislocation entanglement

Solution

For question 33 option C and D both seems to be correct but because we have to produce at high rate so CNC should be preferred according to me options c is better. Compound punch will finish it in a single stroke.

For question number 34 option B is correct because the stress concentration will be high near the large hole as well as near the small holes but because bending takes place near the large hole and it is very near to the bending axis. It is likely to crack.