European Journal of Scientific Research (ISSN: 1450 ... - EuroJournals

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© European Journal of Scientific Research, Vol 7, No 5, 2005 Figure 4: influence density on the average arithmetic variation and cutting pressure. Figure 5: influence average arithmetic variation on the cutting pressure. COMMENTS The weak correlation enters the average effort and the studied factors: average thickness of the chip and density (figures 3, 4, 5) is due to the preponderance of the heterogeneity of the panels compared to the constitution and density of the panels : the size of cut particles and their involuntary separation resulting from the vibrations during the transport of the cake during the composition of the panel. The profile of density not being symetrical on all the thickness of the panel involves during the machining variable cutting pressures, which explains the weak correlations resulting from the study. The influence of the effort compared to the average thickness of the chip is due to the weak range depths of cut used. This is why, it would be interesting for the rest of this work to extend the values by taking different cuts in order to better explain these parameters. As for the power, we will say that the force and the power of the tool during the work of removal of the chip are obviouly correlated. The variations of the results are explained by the vibrations produced at the time of the hold of the chip to which are added those generated by the mechanisms of the machine (figure 2) and the heterogeneity of material.
© European Journal of Scientific Research, Vol 7, No 5, 2005 4. CONCLUSION In spite of the many difficulties which appeared during the study, and which prevented us from carrying out all planned measurements, it seems well that the results obtained are very encouraging. The variations of the density as well as the parameters of cut such as the speeds of transport, the depth of cut and the rotational frequency represented through Em (average thickness of the chip) play an important explanatory part as regards the quality of machining. Following this research, we can the necessity to use raw material the least heterogeneous possible, stress thus to favor the practices allowing to achieve this goal. The density has an action more marked on the efforts and the panels in terms of quality remain dependent on their composition, their hydroscopic balance and their stability. This is why, it would have been interesting to know the initial conditions of manufacture as well as possible facilitating at best the specific studies on workability. These studies constitute a necessary starting point for the identification of the best parameters of cut and the determination of the area of good functioning (concept of the couple tool matter) [ 9, 10 ]. 11
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European Journal of Scientific Research (ISSN: 1450 ... - EuroJournals

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