Optimization of shot peening parameters by response surface methodology

• Air pressure has a decisive and trigger role on the Almen intensity.
• “Shot diameter × air pressure” is observed as the most crucial couple for the model.
• “Peening duration × air pressure” couple also affects dominantly the model outputs.
• Roughness increase is ensured with “peening duration-shot diameter” increase.
• “Peening duration-shot diameter” couple is insignificant for the surface hardness.

In this study, the shot peening parameters which directly influence the arc height of the Almen strip and its characteristics are optimized within the context of Almen intensity, surface roughness and surface hardness via response surface methodology. Determination of the Almen intensity by trial and error method depending on the experience of the technician (measuring the arc height of Almen strips by changing the parameters repeatedly for each shot peening process) makes the optimization approaches valuable. The optimization is considered to perform by selecting surface roughness and surface hardness as the responses in order to classify the shot peening processes by taking into consideration of wide range of plastic deformation level. The effect of input parameters air pressure, shot diameter and peening duration on the Almen intensity, surface roughness and surface hardness is to be determined by using ANOVA regression analysis. Based on the estimated models, optimum peening conditions are introduced via response optimizer. The model adequacy is verified by the confirmation tests.

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