Gears

Due to minimal-to-no distortion with UltraGlow® Ion Nitriding, this means there's no need to grind the tooth form after heat-treatment and the products can be put directly into service.

UltraGlow® Ion (Plasma) Nitriding provides minimal or no distortion - which means no need to grind the tooth form after heat-treatment and the products can be put directly into service. 

New Article! Read this month's Hot Seat column in Gear Solutions Magazine written by our Senior Scientist, Dr. Glow (aka Edward Rolinski) - DISTORTION ENGINEERING OF GEARS

UltraGlow® Ion Nitriding increases wear and scuffing (scoring) resistance of the tooth flanks and bending fatigue resistance at the tooth root as well as the rolling contact fatigue (RCF) resistance of the gear teeth surface. It also produces high resistance to tempering i.e. increases the resistance of the steel to softening at slightly elevated temperatures. Stress studies on nitrided case show there are areas of compressive stresses beneath the surface of the diffusion zone. Additionally, these studies indicate that stress values are at their peak in the most highly alloyed steels.

UltraGlow® Ion Nitrided gears made from an appropriate material can replace carburized and carbonitrided gears. Comparison of tooth flank fatigue strength for different types of steel showed effect of case depth, core hardness, and microstructure on fatigue strength. The load bearing capacity at the flank and root of the gear tooth are affected by thickness of the compound zone; UltraGlow® Ion Nitrided gears with a maximum of one micron compound zone thickness have the highest load bearing capacity. Nitrided gears do not require as much case depth as required in carburized or other case hardened gears, and tensile strength of core material prior to UltraGlow® Ion Nitriding should be taken into account in assessment. Figure 1 shows the recommended case depth based on a diametral pitch of a gear and an ion nitrided gear made of 17-4PH with diametral pitch of 48, micrograph @ 50X showing uniformity of nitrided layer.

AGMA quality class: 10-12 diametral pitch 24-96 precision gears.

 

 Figure 1:

Diametral Pitch

Case Depth (inches)

72 0.0005-0.001
48 0.001-0.002
32 0.001-0.003
30 0.002-0.004
10 0.008-0.015
6 0.015-0.020

 

Additional Resources for Gear Applications:

Modern Nitriding Techniques for Gear Applications

Surface Engineering: Thermochemical surface engineering using plasma nitriding can improve the properties and performance of gears made of steels and titanium alloys.

"Ion Nitriding of Ferrous and Titanium Alloys for Gear Applications", authored by our very own Edward Rolinski, Tekin Damirgi, and Mikel S. Woods, published by Thermal Processing for Gear Solutions.  

 

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