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Plateau honing is being widely used in the production of cylinder bores to produce a surface to achieve the required functional performance. Characterizing plateau-honed surface irregularity into functional components is helpful for process control and functional analysis. The application of wavelet transform to characterize plateau-honed surface is presented. Difficulty exists in quantitatively determining the zooming level for functional characterizing the multi-process produced surfaces. In this paper, we utilize probability plot of bearing ratio curve, to quantify the zooming level of wavelet transform to obtain the functional components which related to different functional aspects from plateau honed surfaces. The effectiveness of this method is demonstrated.

Resistance spot welding (RWS) guns driven by servomotors instead of pneumatic cylinders are called servo guns. They bring many new features to RWS process. In this study, the influences of servo guns on RSW process are systematically investigated based on comparative experiments. In addition, the costs of servo guns are also analyzed. The long-term applications of servo guns will be cost effective due to their technical features and savings on pneumatic systems although the acquisition cost of servo guns is high. Therefore, servo gun is an excellent alternative RSW machine for sheet metal assembly.