Manufacturing Processes: Example Problems
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1. Describe the relative advantages and limitations of cold and hot isostatic pressing.
2. Should green compacts be brought up to the sintering temperature slowly or rapidly? Explain your reasoning.
3. Explain the effects of using fine powders and those of using coarse powders in the making of P/M parts
4. It is possible to infiltrate P/M parts with various resins as well as with metals. What possible applications can benefit from infiltration? Explain.
5. Explain why the mechanical properties of workpiece materials are not significant in most of the processes described in this chapter.
6. In which of the manufacturing activities in industry is the wire EDM process most applicable?
7. Why do different material-removal processes affect the fatique strength of materials to different degrees?
8. Which of the advanced machining processes causes thermal damage? What is the consequence of such damage to workpieces.
9. Does EDM affect the fatigue strength of cold worked metals? Explain.
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1. Describe the relative advantages and limitations of cold and hot isostatic pressing.
In cold isostatic pressing, the metal powder is placed in a flexible rubber mold made of neoprene rubber, or other elastomers. The assembly is then pressurized hydrostatically in a chamber, usually with water. In hot isostatic pressing, the container is usually made of a high melting point sheet metal and the pressurizing medium is inert gas or viscous fluid. The main advantage of the hot process is its ability to produce compacts with essentially 100% density, good metallurgical bonding among particles, and good mechanical properties. This is not true for the case of cold process. However, hot process is relatively expensive, whereas the cold process is quite cheap.
2. Should green compacts be brought up to the sintering temperature slowly or rapidly? Explain your reasoning.
Sintering mechanisms are complex and depend on the composition of the metal particles in green compact as well as the processing parameters. As the temperature is increased slowly and slowly, the two adjacent particles ...
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