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CHAPTER 7 FINISHING OPERATIONS

CHAPTER 7 FINISHING OPERATIONS. Secondary and Finishing operations. Coining (REPRESSING): increase in density – r.t. strength increase work hardening. dimensional/shape change. Sizing - impart dimensional accuracy to sintered part.

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CHAPTER 7 FINISHING OPERATIONS

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  1. CHAPTER 7 FINISHING OPERATIONS

  2. Secondary and Finishing operations Coining (REPRESSING):increase in density – r.t. strength increase work hardening. dimensional/shape change. Sizing -impart dimensional accuracy to sintered part. Machining -Side holes, slots/grooves , no liquid coolant Grindingfor improved dimensional accuracy and surface finish Cold/hot forging - <5% porosity superior properties

  3. Infiltration -pore free parts (iron based compacts with copper, • lead infiltration wear applications) • Oil impregnationlubrication, corrosion resistance • Platingfor wear resistance, improved appearance, and corrosion • resistance. • Heat treating

  4. Design Considerations

  5. Economics of Powder Metallurgy

  6. Advantage and Disadvantages of Powder Metallurgy

  7. Advantage and Disadvantages of Powder Metallurgy

  8. TRENDS

  9. SUMMARY

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