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November/December 2002

Archive > 2002 > November/December 2002

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Feature Articles

Technical Articles

The Barkhausen Noise Inspection Method for Detecting Grinding Damage in Gears
When hardened steel components are ground, there is always the possibility of damage to the steel in the form of residual stress or microstructural changes. Methods for detecting this sort of damage have always had one or more drawbacks, such as cost, time, complexity, subjectivity, or the use of hazardous chemicals.

Predicting the Heat-Treat Response of a Carburized Helical Gear
Using the DANTE software, a finite element simulation was developed and executed to study the response of a carburized 5120 steel helical gear to quenching in molten salt. The computer simulation included heat-up, carburization, transfer and immersion in a molten salt bath, quenching, and air cooling. The results of the simulation included carbon distribution of phases, dimensional change, hardness, and residual stress throughout the process. The predicted results were compared against measured results for hardness, dimensions and residual stress. The excellent agreement between predictions and measured values for this carburized 5120 steel gear provides a basis for assessing the various process parameters and their respective importance in the characteristics of not only these heat-treated parts, but of other compositions and shapes.

Engineered Gear Steels: A Review
The selection of the proper steel for a given gear application is dependent on many factors. This paper discusses the many aspects related to material, design, manufacture, and application variables. The results of several studies on the optimization of alloy design for gas- and plasma- carburization processing and reviewed.

Cutting Hardened Gears
The need for improved power transmissions that use gears and gearboxes with smaller overall dimensions and with lower noise generation has left manufacturing engineers searching for different methods of gear processing. This search has led to the requirement of hardened gears.

Departments

The Gear Industry on Your Desktop (Publishers Page)
With this issue, we're proud to present our latest milestone. The Gear Technology Buyers Guide 2003 on CD-ROM - a comprehensive snapshot of nearly 400 of the industry's suppliers - is the best directory of the gear industry available.

Product News (Product News)
Complete Product News for November/December 2002.

Revolutions (Revolutions)
Welcome to Revolutions, the column that brings you the latest, most up-to-date and easy-to-read information about the people and technology of the gear industry.

Technical Calendar (Events)
Complete Technical Calendar for November/December 2002.

Industry News (Industry News)
Complete Industry News for November/December 2002.

Gear Crossword (Addendum)
Addendum crossword for November/December 2002.