Implementation of velocity measurement as intensity verification in production

Author:  A.M. K
Source:  Conf Proc 2011: ICSP-11 South Bend, IN USA (pgs. 19-24)
Doc ID:  2011003
Year of Publication:  2011
Abstract The current method for determining shot peening intensities and to verify process parame-ters in production is to use Almen strips and saturation curves. Even though it is a well es-tablished process it still has some disadvantages. For example, measurements can not be stored over a longer period of time due to relaxation of the material, online intensity verifica-tion is not possible and the whole process itself can be quite time consuming, depending on the complexity of the part to be peened. In order to find another process which can be used more conveniently, intensity verification by means of velocity measurement of the peening media was investigated. Different parameters which are known to influence the peening intensity were varied and their effects on the shot velocity were documented. Pressure, shot flow, type of nozzle, type of peening media, as well as hose bending and peening angle are among the variables tested. Two different methods of velocity measure-ment were used and compared with one another. A long-term study under production condi-tions was carried out to test the stability and reliability of the measurement process. Based on the results, the potentials of the velocity measurement were identified and possibil-ities were explored to include this process in production as a substitute for or alternative to Almen strip measurement. Keywords Velocity, intensity, almen, ISIC, shotmeter

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