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Heat treatment klp 4

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Heat treatment klp 4

  1. 1. Heat Treatment Induction Hardening By : Afmardi Ibnu Fajri
  2. 2. Induction Hardening What is induction hardening? Induction hardening is a process where steel is hardened by means of induction heating and subsequent quenching in water.
  3. 3. Basic of Principles Induction hardening works by placing the part to be hardened inside an "applicator" coil of one or more turns, through which alternating current is passed. The coil, which in the case of gears and sprockets is round, is usually made of copper tubing which has water passing through it to prevent the coil from overheating. The piece to be hardened is rotated within the applicator coil. At JP Engineering multiple pieces are hardened at the same time by placing the sprockets or gears onto a rod and then rotating the rod, heating the parts and then feeding the rod downward into the quench water.
  4. 4. The Depth of Penetration For T = 20°C f dc = 20 FFoorr TT == 880000°° CC f dh = 500
  5. 5. Frequency distance Power supply Frequency (KHz) Depth of Penetration min (mm) Diameter of material min (mm) Medium Rotary converter 0,5 - 10 1,5 15 High Valve generator 100 - 500 0,2 1,5
  6. 6. Change Of Materials d t t = 0,2 Where d = The Depth of Penetration t = time
  7. 7. Major uses of induction heat treatment • Melting ferrous and non - ferrous metals with temperatures up to 1800 0c. • Heating for forging up to 1250 0c. • Stress relieving and normalizing steels after cold forming between 750 0c and 950 0c. • Surface hardening of steel or cast iron workpieces at 850 0c to 950 0c. • Soft soldering and brazing up to 1100 0c. • Recrystallisation. • Tube and Pipe Welding.
  8. 8. Procedure of Work
  9. 9. Continue……
  10. 10. Factor of Influence to Induction Hardening • Composition of Carbon • Temperature • Time Holding
  11. 11. Chart of Induction Hardening
  12. 12. Advantage of Induction Hardening • Localised hardening of tooth surfaces where hardness is needed • Hardened teeth are pre-work hardened. • Speed of hardening • Depth of hardness is easily controlled • Selected parts of the workpiece can be heated. • Heating time and temperature can be precisely controlled. • There is no smoke or soot pollution;
  13. 13. Continue…. • Heating operation can be integrated in semi - automatic production sequences; • Induction equipment can usually be operated by unskilled personal • Very fast partial hardening; • High production rates; • Significant reduction in pollution, distortion, forging scale, energy and space requirements; • High degree of reproduction and automation;
  14. 14. Example Product of Induction Hardening
  15. 15. Microstructure of AISI 1045
  16. 16. Structuremicro of AISI 4140
  17. 17. Structuremicro of AISI DF2
  18. 18. Hardening of AISI 4140
  19. 19. Hardening of Materials
  20. 20. Thank You

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