————————————————————————————————————————————————— Numerical computer modeling is a major factor in the successful design of induction heating systems. Induction heating is a complex combination of electromagnetics, heat transfer, and metallurgical phenomena involving many factors. Heat transfer and electromagnetics are nonlinear and closely interrelated because the physical properties of heated metals depend strongly on both temperature and magnetic [...]
————————————————————————————————————————————————————- Induction heating the internal surfaces of a workpiece can be used in applications such as hardening, tempering, annealing, shrink fitting, stress relieving, coating, drying, and brazing. Application specifics requires the use of a variety of different inductor styles to heat internal surfaces including solenoid-type, cylindrical single- and multi-turn coils, hairpin inductors, C-core inductors, and others. [...]
Recent Inventions and Innovations in Induction Hardening of Gears and Gear-like Components. Focus in on the latest developments in the area of induction hardening of gears and gear-like components. Learn about a variety of unique patented and patent pending technologies developed during the past 3 to 5 years. Dr. Valery Rudnev, FASM – Thursday, October [...]
Coil copper overheating is another common cause of coil failure. Relatively small coil-to-gear gaps lead to appreciable thermal radiation from the heated surface. This factor in combination with a very limited space allowed for water cooling of the coil can result in copper overheating, particularly when the scanning mode is used for hardening. Both tooth-by-tooth [...]
Induction hardening steel to austenitic temperatures can result in temper back, or annealing of adjacent areas of the material that have been hardened previously. This is particularly important in the induction hardening of crankshafts, camshafts, gears and critical components. This publication discusses above mentioned effect along with some other important features of induction hardening and [...]
Induction surface (case) hardening of hollow shafts has unique features compared with hardening of solid shafts. With solid shafts, the core temperature typically does not rise significantly during heating. The relatively cold core compli- ments spray quenching by increasing the cooling intensity of shaft surface (cold-sink effect)[4,5]. By comparison, with hollow shafts, the cold-sink effect [...]
Surface hardening of carbon steel and iron is one of the most common forms of heat treating by induction. The goal in surface hardening is to provide a martensitic layer on specific areas of the workpiece to increase hardness and wear-resistance while allowing the remainder of the part to be unaffected by the process. Click [...]
Induction surface (case) hardening of hollow shafts has unique features compared with hardening of solid shafts. With solid shafts, the core temperature typically does not rise significantly during heating. The relatively cold core compliments spray quenching by increasing the cooling intensity of shaft surface (cold-sink effect). By comparison, with hollow shafts, the cold-sink effect is [...]
Some induction practitioners have heard about simultaneous dual frequency gear hardening. Coil current waveform comprises two appreciably different frequencies making effect of two single frequency inverters working on the same coil at the same time.
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