Exposing a steel work-piece to an electro-magnetic field produces a heating effect in the surface of the work-piece, by the phenomenon known as induction. This surface heating produced by the induced electro-magnetic current in the work-piece, can be used for softening, hardening or metal joining operations, depending upon the steel, the work-piece environment and particular temperature changes employed. The most common application of induction treatment is in the hardening of steel components with carbon contents of between 0.4 and 0.5%. A copper induction coil is made to surround the work-piece and the surface temperature is raised to above the upper critical temperature in a few seconds. For most applications high current frequencies of 200kHz or above are used or alternatively medium frequencies of up to 10kHz. A quenching spray of a suitable solution follows the inductor as it traverses the work-piece, providing rapid cooling to produce the full hardening transformation of the heated zone.
There are two main methods of induction hardening, ‘single shot’ hardening where the whole area to be hardened is heated at once e.g. small gears which are spun inside the inductor and their entire periphery heated and quenched. Alternatively, the work-piece can be traversed, as with long shafts, where the area to be hardened is progressively heated and quenched by a moving induction coil followed by a quench ring, or in the case of gears the tooth by tooth method of hardening.
Surface hardness in the range 50 to 60 HRc is obtainable by induction hardening, depending upon the steel analysis used. It is a clean, controllable, rapid process which is very energy efficient and is readily automated. Since only the surface of the work-piece is transformed, distortion is minimised, although care is required to ensure that the rapid heating does not produce component cracking.
Bodycote Thermal Processing - Santa Fe Springs (Burke St), California Bodycote Thermal Processing 11845 Burke Street Santa Fe Springs CA 90670-2537 California |
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Bodycote - Indianapolis, Indiana Bodycote 500 West 21st Street Indianapolis IN 46202 Indiana |
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Bodycote - Canton, Michigan Bodycote 8468 Ronda Drive Canton MI 48187 Michigan |
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Bodycote - Tulsa (74th St.), Oklahoma Bodycote 4208 South 74th East Avenue Tulsa OK 74145 Oklahoma |
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Bodycote - Tulsa (Pine St.), Oklahoma Bodycote 1520 North 170th East Avenue Tulsa OK 74116 Oklahoma |
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Bodycote - Fort Worth, Texas Bodycote 2005 Montgomery Street Fort Worth TX 76107 Texas |
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Bodycote - Houston-Robertson, Texas Bodycote 4201 Robertson St Houston TX 77009 Texas |
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Bodycote - Sturtevant, Wisconsin Bodycote 7316 Durand Avenue Sturtevant WI 53177 Wisconsin |
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