Effect of corrosion on sawing stability of diamond circular saw blade
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摘要: 针对锈蚀金刚石圆锯片锯切时出现锯切稳定性降低的问题,根据不同锈蚀程度锯片的结构参数建立模型,采用有限元法对锈蚀锯片进行模态分析,将锯切振动作为稳定性的参考指标,研究锈蚀对锯片锯切稳定性的影响,并通过实验验证理论分析的准确性。结果表明:在640~1 280 Hz频率范围内锈蚀锯片的振型模态比原锯片多6阶,并且相邻固有频率差值减小了8.56 %,随锈蚀程度的增加,锯片更容易出现共振现象;锯片轴孔位置处和1/3至2/3半径圆环范围的锈蚀对锯片的锯切稳定性影响较大,因此可以通过优化加工参数、减少表面缺陷的方式减小锈蚀程度,降低对锯片锯切稳定性的影响。该研究为金刚石圆锯片的实际使用和防锈工艺提供了指导依据。Abstract: When the rusted diamond circular saw blade works, there will be some problems such as reduced sawing stability. In response to this phenomenon, models are established through the structural parameters of saw blades with different corrosion degrees, and modal analysis of saw blades with different corrosion degrees is carried out. This analysis takes sawing vibration as a reference index of stability and studies the influence of saw blade corrosion on stability. Experiments verify the accuracy of the results. The results show that the vibration modes of the corroded saw blade more are more than 6 orders different from those of the original saw blade, and the difference in adjacent natural frequencies reduces by 8.56 % in the frequency range of 640 to 1,280 Hz. With the increase of corrosion degree, the saw blade is more prone to resonance. Corrosion at the important position has a great influence on the sawing stability of the saw blade. Reducing surface defects can reduce corrosion and its influence on the sawing stability of the saw blade. This study provides guidance for the practical use and rust prevention technology of diamond circular saw blades.
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Key words:
- diamond circular saw blade /
- rust /
- sawing stability /
- modal analy
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表 1 锈蚀蚀坑参数
Table 1. Corrosion pit parameters
锈蚀蚀坑编号 直径d/mm 深度h/mm A 0.035 — B 0.084 — C 0.146 — D 0.323 — E 0.631 — F 2.600 0.32 G 46.300 0.86 H 107.600 0.97 表 2 ɸ1 070 mm金刚石圆锯片基本参数
Table 2. Basic parameters of ɸ1 070 mm diamond circular saw blade
参数 取值 锯片直径D/ mm 1 070 基体直径D1 / mm 1 054 基体厚度E/ mm 6 内孔径H/ mm 100 槽深A/ mm 22 槽宽B/ mm 22 齿数Z/ 个 96 卡盘直径D2 / mm 250 表 3 金刚石圆锯片基体与锯齿的材料参数
Table 3. Material parameters of diamond circular saw blade matrix and saw tooth
参数 基体 锯齿 材料 75Cr1 Cu + Co + Ni 密度ρ/(kg·$ {\mathrm{m}}^{-3}) $ 7 800 8 510 弹性模量E/ GPa 209 560 泊松比μ 0.30 0.25 表 4 锈蚀金刚石圆锯片模型参数
Table 4. Model parameters of corroded diamond circular saw blade
锈蚀锯片方案 蚀坑直径
d /mm蚀坑深度
h /mm蚀坑数量
n /个蚀坑分布 金刚石圆锯片 — — — — 锈蚀锯片 方案一 1 0.3 1 000 随机分布 方案二 10 0.6 500 方案三 20 0.8 300 方案四 50 0.9 100 方案五 100 1.0 50 表 5 锯片在640~1 280 Hz下的固有频率对比
Table 5. Natural frequencies comparison of saw blades in the range of 640~1 280 Hz
阶次 固有频率 f / Hz 锯片 锈蚀锯片 800 r/min 800 r/min 790 r/min 780 r/min 1 9.177 6.990 7.450 7.710 2 12.970 9.690 9.880 9.970 3 22.270 18.350 18.550 18.950 4 35.760 27.720 28.430 29.130 表 6 不同转速下的锈蚀锯片固有频率
Table 6. Natural frequencies of corroded saw blades at different speeds
阶次 固有频率 f / Hz 锯片 锈蚀锯片 800 r/min 800 r/min 790 r/min 780 r/min 1 9.177 6.990 7.450 7.710 2 12.970 9.690 9.880 9.970 3 22.270 18.350 18.550 18.950 4 35.760 27.720 28.430 29.130 表 7 实验主要仪器
Table 7. Main experimental instruments
仪器名称 型号 灵敏度 信号采集器 INV3018A — 模态分析系统 DASP V10 — 力锤 LC13 3.89 pC/N 加速度传感器1 LC0402 24.2 pC/g 加速度传感器2 LC0402 25.5 pC/g 表 8 固有频率数据对比
Table 8. Natural frequency data comparison
阶次 锈蚀锯片1 锈蚀锯片2 固有频率f /Hz 误差/% 固有频率f /Hz 误差/% 模拟 实验 模拟 实验 1 23.89 23.06 3.48 27.32 26.82 1.83 2 39.09 38.16 2.38 46.50 48.48 4.26 3 55.93 52.68 5.81 63.29 63.34 0.08 4 90.78 87.17 3.98 105.36 104.25 1.05 5 99.35 104.67 5.35 109.93 110.64 0.65 6 145.82 137.64 5.61 166.79 169.27 1.49 7 157.70 152.71 3.16 180.45 179.35 0.61 8 171.80 175.67 2.25 197.90 195.80 1.06 9 210.37 214.25 1.84 233.23 228.27 2.13 10 235.78 237.49 0.73 272.06 271.86 0.07 -
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