关键词: 圆锯片, 锯齿结构参数, 模态, 啸叫, 应力, 有限元分析法

Abstract: The 75Cr1 circular saw blade is widely used in processing materials such as wood and aluminum alloy building materials. The structural parameters of saw teeth significantly influence its working performance. To solve problems like excessive squealing noise and short fatigue life of saw teeth,the finite element analysis method was applied to explore the effects of tooth number and height on the mode shapes and natural frequencies of the 75Cr1 circular saw blade. The circular saw blade model′s accuracy was verified through experiments. A regulation mechanism for optimizing tooth number and height to avoid the circular saw blade′s squealing was proposed. Finally,the impacts of tip angle and tooth height on saw teeth sawing stress were analyzed. Results show that tooth number and height have relatively minor effects on mode shapes.In terms of natural frequency,the natural frequency of the circular saw blade exhibits a decreasing trend with increasing tooth number. When the tooth height is increased,the natural frequency continues to decrease,particularly under higher-order modes,where the differences in natural frequency among circular saw blades with different tooth heights become more pronounced.Moreover,with the cutting volume per tooth unchanged,stress decreases as the tip angle widens and increases as the tooth height grows.

Key words: circular saw blades, structural parameters of saw teeth, mode, squealing, stress, finite element analysis method