Pre midterm

34 flashcards · Other · by Liam Kehoe

  1. Types of conventional machining

    Milling, sawing, turning, broaching, drilling, boring

  2. Types of abrasive machining

    grinding, polishing, lapping

  3. Pros of machining

    Dimensional accuracy Complex shapes Surface finish Can process many materials Can be economical for small batches

  4. Cons of machining

    Can be expensive for large amount of batch Waste of materials Lubricants Can be longer compared to shaping May have adverse effects of surface integrity

  5. Importance of cutting forces

    Optimize machining process Prevent excessive tool wear Process monitoring

  6. Parameters affecting cutting forces

    RPM, depth, width, feed rate, tool geometries, workpiece, lubricants

  7. Aspects to consider surface

    Friction and wear Safety Aesthetic Fatigue Contacts Mechanical integrity of materials

  8. White light interferometer

  9. Tribology

    Science and technology of interacting surfaces involving friction, wear and lubricants

  10. Types of wear (tools and tribology)

    Adhesive wear Abrasive wear Corrosive wear Fatigue wear

  11. Benefits of lubrication

    Reduce friction and wear Major variables Contact pressure Speed Temperature

  12. Using lubricants in manufacturing

    Lower friction and wear High material flow in tools and dies Act as a thermal barrier Act as releasing agents Cooling Remove debris

  13. Surface treatments

    Shot peening Case hardening (carburizing) Vapor deposition (PVD, CVD, sputtering) Electroplating Anodizing - oxidation process Painting

  14. Benefits of painting as a surface treatment

    Improve resistance to wear, errosion Control friction Reduce adhesion Improve lubrication Resistance to corrosion and oxidation Improve fatigue resistance Modify surface texture

  15. Physical vapor deposition (PVD)

    Is a surface treatment: Particles are physically deposited Vacuum deposition Sputtering Ion plating

  16. Chemical vapor deposition (CVD)

    Surface treatment

  17. Electroplating

    Surface treatment Cathode (collector) and anode (donor) Metal ions from anode are discharged using PE through electricity Metal ions are dissolved into the solution Deposited to negatively charged cathode

  18. Detrimental effects on fatigue life of material

    Hardening, grinding, machining, plating, welding, EDM and ECM

  19. Beneficial effects on fatigue life of materials

    Carburizing, honing, polishing, burnishing, rolling, shot peening

  20. Metrology

    Measurement of dimensions

  21. CMM

  22. Laser Doppler Vibrometer

  23. SEM (Scanning electron microscope)

  24. Atomic Force microscope (AFM)

  25. Non destructive testing tools

    Ultrasonic Radiography (x-ray) Acoustic emission Eddy current inspection Magnetic flux leakage (MFL)

  26. Ultrasound

  27. X-ray

  28. Acoustic Emission

  29. Eddy Current

  30. Magnetic Flux Leakage

  31. Poissons Ratio

    lateral strain/longitudinal strain

  32. What is hardness

    Hardness is directly related to other mechanical properties such as strength and wear resistance Resistance to localized plastic deformation

  33. Creep

    Permanent deformation due to static loading important in high-temp applications

  34. Residual Stress

    Left over stress Stress remains within a part after it has deformed of all external forces have been removed Compressive RS is good for fatigue while tensile RS is bad for fatigue