Needs and possibilities of the reduction of machining automation errors on the basis of the measurements of a workpiece which undergoes a multi-sided machining is presented in the paper. The article briefly shows various sources of machining errors and their reduction methods. The difficulties occurring when taking into account the CMM measurements results in the workshop environment are characterized. The examples of how the presented approach can be applied in practice is displayed.
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Opisano metodykę wyznaczania przestrzennych modeli CAD śladów pozostawianych przez procesy obróbkowe na powierzchniach swobodnych. Podstawą wyznaczania modeli są lokalne odchyłki wyznaczane w pomiarach współrzędnościowych przeprowadzanych według regularnej siatki punktów. Do estymacji modeli zaproponowano stosowanie autorskiej metodyki wykorzystującej analizę regresji, statystykę przestrzenną, procedurę iteracyjną i modelowanie NURBS.
EN
The methodology of determining CAD models of spatial patterns left by machining processes on the free-form surfaces is presented. The basis for determining the models are local deviations determined in coordinate measurements carried out along a regular grid of points. To estimate the proposed models applying proprietary methodology that uses regression analysis, spatial statistics, iterative procedure and NURBS modelling is proposed.
It has been shown that machine tool thermal distortion can account for up to 70 per cent of the total machining error. As a result there has been a great deal of interest in techniques for minimising thermal errors influence on the accuracy of the workpiece. Usually the solutions based on the temperature measurement and neural networks are used for this purpose. However, due to the complexity of the thermal distortions' phenomenon, long time constant and the diversification of the machining cycles the mentioned solution is not fully satisfying. There is an urgent need for direct measurement of thermal distortions during operation of the machine tool. The paper presents the idea of simple direct measurement and displacement sensors that are used for monitoring of the NC lathe thermal distortions.
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