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Following is the second part of an article begun in our last issue. The first part covered basic shot peening theory, shot peening controls, and considerations that should go into developing a shot peening specification. Part II covers optional peening methods and the relationship of shot peening specifications to the drawings.
Shot peening is widely recognized as a prove, cost-effective process to enhance the fatigue characteristics of metal parts and eliminate the problems of stress corrosion cracking. Additional benefits accrue in the areas of forming and texturizing. Though shot peening is widely used today, the means of specifying process parameters and controlling documents for process control are not widely understood. Questions regarding shot size, intensity, and blueprint specification to assure a high quality and repeatable shot peening process are continually asked by many design and materials engineers. This article should answer many of the questions frequently asked by engineering professionals and to further assist companies interested in establishing a general shot peening specification.
The search for greater gear life involves improvement in cost, weight and increased power output. There are many events that affect gear life, and this paper addresses those relating to fatigue, gear tooth pitting, fatigue strength losses due to the heat treating processes and shot peening technique. The capability of shot peening to increase fatigue strength and surface fatigue life eliminate machine marks which cause stress risers, and to aid in lubrication when properly controlled, suggests increased use and acceptance of the process.
This article focuses on bending fatigue strength improvements of P/M gearing from recent improvements in P/M technology, combined with shot peening.
U.S. Shot Peening and Blast Cleaning Workshop.
Gear surface fatigue endurance tests were conducted on two groups of 10 gears each of carburized and hardened AlSI 9310 spur gears manufactured from the same heat of material
For maximum life in carburized and ground gearing, I have been advised that fully grinding a radius into the root gives maximum resistance against fatigue failures. Others have advised that a hobbed and unground radius root form is best. Which is best, and why?
News Items About shot peening
1 Addition of Robot Blasting Cell Enables Shot Peening Demonstration (April 23, 2009)
Guyson Corporation expanded its engineering test laboratory with the purchase of a robotic blast system to sustain application developmen... Read News
2 International Scientific Committee for Shot Peening Announces Conference Call for Papers (January 8, 2010)
The Eleventh International Conference on Shot Peening (ICSP-11) will be held September 12-15, 2011 in South Bend, IN. ICSP-11 is a trienn... Read News
3 Shot Peening Conference Calls for Papers (March 9, 2010)
The organizing committee of the Eleventh International Conference on Shot Peening (ISCP-11) is seeking papers that further the understand... Read News