______________________________________________________________________________________________ Question of the Month: For a few years, we scan hardened relatively straight shafts using a 30 kHz machine. Our new component has a 4.8-mm radial step (sharp shoulder) that melted when we tried to scan harden. We heard that a single-shot inductor could reduce shoulder overheating and still provide sufficient hardening, so we […]
______________________________________________________________________________________________ Question of the Month: For quite a while after scan hardening, we experience low hardness readings (52-55 HRC) in areas where the diameter of our 1045 steel hollow shaft changes. We have consulted with induction heating specialists, but have not eliminated the problem. What causes soft spots at these locations and how we can […]
Author: Dr. Valery Rudnev Publication: Gear Technology Date: March/April 2013 This paper examines the expanding capabilities of induction hardening of gears through methods like spin hardening or tooth-by-tooth techniques.
Author: Gary Doyon, Valery Rudnev, John Maher, Randy Minnick, Glen Desmier Publication: Industrial Heating Magazine Date: December/2014Induction heat treatment is a common method for heat treating different automotive components, including camshafts, which belong to the group of critical engine/powertrain components. Now a new approach makes it possible to induction harden camshafts with almost undetectable distortion.
————————————————————————————————————————————————— Inappropriate coil design parameters and process recipe may result in crack development near oil holes. Longitudinal and transverse holes an induction heated component can cause an undesirable redistribution of eddy current flow, generating excessive heat in certain regions of the workpiece, which could potentially lead to localized overheating. Overheating can cause unwanted metallurgical microstructures, […]
————————————————————————————————————————————————— 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 […]
Article discusses unique technology that allows the replacement of carburizing with induction contour hardening for a wide range of complex-shaped components, including parts previously thought to be impossible to induction harden. This includes but not limited to spiral bevel pinions, spiral bevel ring gears, journal and differential crosses, helical bull gears, shaft helical shafts, etc. […]
ASM Heat Treat Conference; Cincinnati, OH Monday, October 31 – Room: 238 – 11:30 a.m. Unique Computer Modeling Approaches for Simulation of Induction Heat Treating Applications. Dr. Valery Rudnev, Inductoheat Inc., Madison Heights, MI Come visit the Inductotherm Group Booth, 1611 at the ASM Heat Treat Conference October 31 – November 2. While you are there, stop […]
There are three ways to quench gears in spin hardening applications (Ref. 1): • Submerge the gear in a quench tank. This technique is particularly applicable for large gears. • Quench “in place” using an integrated spray quench. Small- and medium-size gears are usually quenched using this technique. • Use a separate, concentric spray-quench block […]
Whenever someone is talking about induction heating, reference is often made to the phenomenon of skin effect. In most publications devoted to induction heating distributions of current density and power density (heat source distributions) along the workpiece thickness/radius are simplified, and described as exponentially decreasing from the surface into the workpiece. However, in some applications, […]