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Purpose: This paper proposes an analytical method of evaluating the maximum error by modeling the exact tool path when the tool traverses singular region in five-axis machining. Design/methodology/approach: It is known that the Numerical Control (NC) data obtained from the inverse kinematic transformation can generate singular positions, which have incoherent movements on the rotary axes. Such movements...
Purpose: Upon unloading in a forming process there is elastic recovery, which is the release of the elastic strains and the redistribution of the residual stresses through the thickness direction, thus producing surface deflection. It causes changes in shape and dimensions that can create major problem in the external appearance of outer panels. Thus surface deflection prediction is an important issue...
This paper presents an efficient algorithm to distinguish airvoids of polished concrete specimens using image processing for a fully automated image analysis system. In order to distinguish air-voids from aggregates and cement paste, the proposed algorithm adopts mathematical morphology and color image processing. First, air-voids and aggregates are extracted, based on a global threshold which is...
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