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内产生空气湍流，从而引起空气压力波动。这些波动被人们以噪音的形式感知。据HVBG称，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 dB (A)的允许噪声限值。为了有效地减小锯片中切屑空间的尺寸，观察切屑松动系数和切屑的尺寸分布是很重要的。这些因素取决于材料、刀具的磨损状态、切削参数（切削速度、上清液、齿进给、进给速率等）。与金属加工相比，没有基于研究的证据表明，圆锯的切屑松动因素和切屑尺寸分布已知用于木工。为了使噪声最小化，有必要对芯片空间尺寸的必要体积进行系统和基本的研究。因此，为了尽量减少锯片的噪音水平，有必要减少切屑空间。为了知道可以减少多少空间，研究结论是必要的，关于芯片空间大小所需的体积。在确定了去除切屑所需的最小体积之后，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。不同的变化在切割，切屑空间，圆锯体几何形状的低噪声设计必须产生。这些不同的方法必须是多种多样的，并相互结合，以构建一个低噪音的圆锯片。通过气动声学仿真，找出新研制圆锯片存在的问题，并对其进行优化。在开发和生产了至少三种解决方案后，必须检查它们在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.