Contact fatigue and bending fatigue are two main failure modes of steel gears, while surface pitting and spalling are two common contact fatigue failures -- caused by alternating subsurface shear stresses from the contact load between two gear mates. And when a gear is in service under cyclic load, concentrated bending stresses exist at the root fillet -- the main driver of bending fatigue failures. Induction hardening is becoming an increasingly popular response to these problems, due to its process consistency, reduced energy consumption, clean environment and improved product quality -- but not without issues of its own (irregular residual stresses and bending fatigue). Thus a new approach is proposed here that flexibly controls the magnitude of residual stress in the regions of root fillet and tooth flank by pre-heating prior to induction hardening. Using an external spur gear made of AISI 4340 as an example, this new concept/process is demonstrated using finite element modeling and DANTE commercial software.
Heat treating is one of the most critical operations in the manufacture of quality gears. Everything can be done to perfection, but if the heat treating isn’t right, all of your hard
work and efforts are wasted. We know how
important it is for gear manufacturers to find the right heat treating service provider. That’s why we’ve compiled this Heat Treat Resource Guide -- the only directory of heat treat service
providers that’s specific to the gear
industry. The companies listed here are all interested in working with gear manufacturers, and many of them have specialties and capabilities that are uniquely suited to the types of products you manufacture.
ICBP Jumbo is the latest ECM solution design for the low pressure carburizing furnace range. It maintains all the compact and modular qualities of the ICBP Flex design but goes further in terms of volume and number of parts treated...
Nitrion Technology and Seco/Warwick do Brasil have signed a cooperation agreement to manufacture and market cold wall plasma nitriding equipment in South America...
No. 954 is an electrically-heated 2000°F(~1093°C) inert atmosphere heavy-duty box furnace from Grieve, currently used for heat treating titanium at the customer's facility...
Mass production of components used for critical functions in large heavy-duty machines requires that strict industry specifications be met. Low cost-per-part targets are also essential, while achieving repeatable quality over very large production volumes.