Desenvolvimento de uma metodologia para análise da incerteza de uma máquina de medição por coordenadas com sensor a laser

Abstract

In the scanning process there are inherent limitations and operational difficulties that influence the acquisition of data. According to VARADY (1997), the main are: calibration, precision, accessibility, occlusion, fixation, multiple frame, sound, statistical distribution model and surface covering. This work of doctorate degree thesis displays a methodology of study able to contribute to the uncertainty analyze of measurement from measurement machines by coordinates that include laser sensors with the evaluation of the influence parameters (geometry, nature of the material and color of the piece) and factors (numbers of scanning from the same surface and the sensor orientation). In the evaluation of the geometry influence it was used two patterns of reference: a pattern block and one sphere of reference, for the nature of material and color, four pieces with identical geometry and nominal dimensions were machined: one is aluminum, two of nylon in black and white colors and another one in wood. In relation to the scanning it was applied two systematics (sensor orientation), varying the number of passes from 1 to 10, that is, the number of times that the laser beam passes by the piece in the scanning process. The obtained results evidence the influence of parameters and applied factors.