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Finishing Operations in Powder Metallurgy: Techniques, Applications, and Considerations

This chapter delves into secondary and finishing operations in powder metallurgy, covering coining, sizing, machining, grinding, forging, infiltration, oil impregnation, plating, heat treating, and design considerations. It explores how these operations increase density, strength, work hardening, dimensional accuracy, and surface finish of sintered parts. Additionally, it discusses the economics and advantages/disadvantages of powder metallurgy, highlighting industry trends and providing a comprehensive summary.

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Finishing Operations in Powder Metallurgy: Techniques, Applications, and Considerations

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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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