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INFLUENCE OF THE PROCESSING PARAMETERS UPON THE BIRCH WOOD

机译：加工参数对桦木的影响

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The main objective of the experimental research was to assess the quality of the birch wood surfaces after sanding them with 60, 80, 100 and 120 grit sizes, by analyzing the roughness parameters of the sanded surfaces in each phase. The birch wood specimens were sanded parallel, perpendicular and inclined with 45 degrees against the wood grains. The variables of the sanding process were considered to be the feed speed and the cutting depth. For conducting the research, the samples were sanded in an industrial mode on a wide belt sanding machine, at SC NIKMOB SA Company, in Nehoiu, Buzau county. The equipment used to measure the roughness of the sanded surfaces was an optical profilometer FRT-MicroProf type (German production) with results in roughness parameters that characterize the quality of that surface. Among all the parameters obtained for this study, two roughness parameters were chosen, namely: Rk, the parameter that estimates the machining roughness and Rpk parameter, which estimates the raised fiber - for the two areas of the specimens with and without wetting. Data processing after measuring and recording the quality of the surface in terms of roughness parameters was achieved by nonlinear regression method, using a second-order equation with two variables. In order to assess the quality of the sanded surfaces, the results were compared by varying the grit sizes, machining direction, feed speed and the sanding depth for the two distinct areas of the specimens, respectively with and without wetting. The results were also interpreted by ANOVA test for two separate variables, namely the sanding depth for wet and dry method, in case the speed feed was constant. The data were processed for each sanding schedules and each direction of processing. The results have shown that the quality of the wet surfaces was higher than that of the surfaces sanded prior wetting, disregarding of the direction of processing. It was also found that for the final grit size of 120, the best results were obtained in case of prior sanding with other two different grit sizes. The results of the present research can be successfully applied in the wood industry, for birch wood furniture production, in order to reduce the material consumption and to improve the sanding process by using appropriate technology with results in the high quality of the surface obtained.
机译：实验研究的主要目的是通过分析各阶段砂纸表面的粗糙度参数，评估桦木木材表面用60、80、100和120粒度的砂纸打磨后的质量。桦木标本平行，垂直打磨，并与木纹呈45度倾斜。砂光过程的变量被认为是进给速度和切削深度。为了进行研究，将样品以工业模式在位于布扎县内霍尤的SC NIKMOB SA公司的宽带砂光机上进行了砂磨。用于测量磨砂表面粗糙度的设备是光学轮廓仪FRT-MicroProf型（德国生产），其粗糙度参数可表征该表面的质量。在为这项研究获得的所有参数中，选择了两个粗糙度参数，即：Rk（用于估计加工粗糙度的参数）和Rpk参数（用于估算毛化纤维），用于有和没有润湿样品的两个区域。使用具有两个变量的二阶方程，通过非线性回归方法完成了根据粗糙度参数测量和记录表面质量后的数据处理。为了评估打磨表面的质量，通过改变试样的两个不同区域的砂粒大小，加工方向，进给速度和打磨深度来比较结果，分别进行润湿和不进行润湿。如果速度进给是恒定的，则通过ANOVA测试还可以解释两个独立变量的结果，即湿法和干法的砂磨深度。针对每个打磨时间表和每个处理方向对数据进行处理。结果表明，不管加工方向如何，湿表面的质量都比润湿前打磨的表面的质量高。还发现，对于最终粒度为120的砂纸，如果事先用其他两种不同粒度的砂纸打磨，则可获得最佳结果。本研究的结果可以成功地应用于木材工业，用于桦木家具的生产，以通过使用适当的技术减少材料消耗并改善砂光工艺，从而获得高质量的表面。

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