Low-noise circular saw blades for wood and wood-based material cutting

提出的研究项目旨在降低旋转圆锯的声压级。旋转的圆锯片主要在切屑空间产生空气湍流，导致空气压力波动。这些波动以噪音的形式被人们感知到。根据HVBG的说法，噪音仍然是该行业最大的健康危害之一。圆锯发出的噪声几乎总是高于85分贝(A)的允许噪声限值。为了有效地减小锯片中的切屑空间，重要的是要观察切屑松动系数以及切屑的尺寸分布。这些因素取决于材料、刀具的磨损状态、切割参数(切割速度、上清液、进给齿、进给速度等)。与金属加工相比，木工锯切屑松动系数和切屑尺寸分布的研究证据是不为人所知的。为了将噪声降到最低，有必要对所需的芯片空间大小进行系统的和基础性的研究。因此，为了将锯片的噪声水平降到最低，有必要减小芯片空间。为了知道可以减少多少空间，需要关于所需芯片空间大小的体积的研究结论。在确定了切屑去除所需的最小体积后，必须设计出具有最小空气湍流和充分去除切屑的理想锯片几何形状。为实现低噪声设计，必须在锯切、切屑间距、圆锯片刀体几何形状上产生不同的变化。这些不同的方法必须多种多样，并相互结合，才能构造出低噪声的圆锯片。借助气动声学模拟，将在新开发的圆锯片上找出问题区域，然后进行优化。在至少开发和生产了三种解决方案之后，必须检查它们在机械加工和噪声辐射方面的适用性。

The proposed research project is aiming in reducing the sound pressure level of rotating circular saws. A rotating circular saw blade is producing air turbulences mainly in the chip spaces which cause air pressure fluctuations. These fluctuations are being perceived by people in the form of noise. According to the HVBG noise is still one of the biggest health hazards in the industry. The emitted noise of circular saws is almost always above the permissible noise limit of 85 dB (A). To efficiently reduce the size of the chip space in the saw blade it is important to observe the chip loosening factor -and the size distribution of the chips. These factors are dependent on the material, wear state of the tool, cutting parameters (cutting speed, supernatant, tooth feed, feed rate, etc). In contrast to the metalworking no research-based evidence regarding the chip loosening factor and the chip size distribution for circular saws are known for woodworking. To minimize the noise, systematic and fundamental investigations about the necessary volume of chip space size are necessary. Therefore to minimize the noise level of the saw blade it is necessary to reduce the chip space. In order to know how much the space can be reduced research conclusions are necessary regarding the volume of the chip space size required. After the necessary minimum volume was determined for chip removal, the ideal geometry of the saw blade with minimal air turbulence and sufficient removal of the chips must be designed. The different variations in the cutting, chip space, circular saw blade body geometry for low-noise design have to be generated. These different approaches have to be varied and combined with each other to construct a low-noise circular saw blade. With the help of aero-acoustic simulations, the problem areas will be identified on the newly developed circular saw blades and then optimized. After at least three solutions were developed and produced, they must be checked for suitability in machining and noise radiation.