5) The hollow cylinder shown in Figure 1 is to be made from fine copper powder a

Question

5) The hollow cylinder shown in Figure 1 is to be made from fine copper powder and to have a ductility of 20% reduction of area. The solid-state sintering of the green compact resulted in a linear shrinkage of 8%. The dimensions given in Figure 1 are for the sintered compact (finished part). If the part is to be compacted using a die and an upper punch, then find the following using data in Figure 2: 40 (6 pts) (6 pts) The green density The compacting force The initial volume of the powder (before compaction)(5 pts) Assume you are an engineer in a company and you are asked to reduce the shrinkage that takes place during sintering, what would you do at any stage during Powder Metallurgy process to achieve this objective? a. 25 mm b. d. 40 mm (3 pts) Figure 1: hollow cylinder

Explanation / Answer

For A. Density of green1.4 g/cm2

For B. Compacting force is 20 ton/ inch2

For C. Intial volume of the powder is 460mm2

For D. For reducing the shrinkage more time mix in the mill then we can achieve less chance to shrinkage

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