ABSTRACT

Spherical wood bodies included in the various objects or assemblies may be subjected to compression forces. On the other hand, there are several methods of obtaining spherical wood bodies by removing the material in chips. It is of interest, as such, to develop research that highlights the compression behavior of spherical wood bodies obtained as a result of the application of cutting processes. A machining method was selected taking into account the available research conditions. The selected machining method is based on the use of a rotary tubular drill and which performs a feed movement along a direction perpendicular to the workpiece rotation axis. Spherical bodies obtained from beech and ash were tested in compression using a factorial experiment with three independent variables at two levels of variation. The values of the compression force at which the cracking of the spherical wood bodies occurs were determined. The results of the experimental tests were mathematically processed. An empirical mathematical model was established to highlight the influence exerted by the wood material, the diameter of the spherical body, and the direction of the compression efforts to the direction of the wood grains on the force value from the moment of cracks.

摘要

包含在各种物体或组件中的球形木体可能会受到压缩力。另一方面，有几种方法可以通过去除木片中的材料来获得球形木体。因此，开展研究以突出由于应用切削工艺而获得的球形木体的压缩行为是很有意义的。考虑到可用的研究条件，选择了一种加工方法。所选择的加工方法基于旋转管状钻头的使用，并沿垂直于工件旋转轴的方向执行进给运动。对从山毛榉和白蜡树中获得的球体进行了压缩测试，使用具有两个变化水平的三个自变量的析因实验。测定球形木体开裂时的压缩力值。实验测试的结果经过数学处理。建立了一个经验数学模型，以突出木材材料、球体直径以及压缩力向木纹方向的方向对开裂时刻的力值的影响。