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目的探索PCD刀具磨损机理,以延长刀具使用寿命。方法设计正交试验,研究不同加工参数切削大理石对刀具磨损的影响情况。分析主轴转速、进给速度与切削深度对PCD刀具磨损量的影响规律,以优化切削参数来减小刀具磨损量。根据经验公式,建立单位时间刀具磨损量和固定行程磨损量模型。通过对试验过程刀具振动情况记录,结合刀具实际磨损情况,给出了刀具磨损等级。结果主轴转速的提高可以减少刀具磨损量,进给速度的增大会加剧刀具磨损,而切削深度小于1 mm时,其对刀具磨损量的影响很小,但切削深度大于1 mm时,继续增大切削深度会使刀具快速磨损。利用预测模型能够很好地对刀具磨损情况进行预判,根据磨损等级,得出刀具与机床发生共振时磨损最为严重,在刀具表面产生了明显的犁沟、磨损以及金刚石颗粒脱落。结论在实际加工中,通过提高主轴转速、降低进给速度以及减小切削深度有助于增强刀具的耐用度,避开共振切削参数可以有效降低刀具磨损,主轴转速、进给速度、切削深度分别为12000r/min、500 mm/min、0.5 mm时的切削效果较佳,有最小的刀具磨损量。
Objective To explore the wear mechanism of PCD tool in order to prolong the service life of the tool. Methods Orthogonal experiments were designed to study the influence of cutting marble on tool wear with different processing parameters. The influences of spindle speed, feed speed and depth of cut on PCD tool wear were analyzed to optimize the cutting parameters to reduce the tool wear. According to the empirical formula, the tool wear amount and the fixed stroke wear amount per unit time are established. Through the test of the tool vibration record, combined with the actual wear and tear of the tool, given the tool wear level. Results The increase of the spindle speed can reduce the tool wear. The increase of the feed speed will aggravate the tool wear. When the cutting depth is less than 1 mm, the impact on the tool wear is small. However, when the cutting depth is greater than 1 mm, Cutting depth can cause rapid tool wear. Prediction of tool wear can be well predicted by using the prediction model. According to the wear level, it is found that the wear of the tool is the most serious when it resonates with the machine tool, resulting in obvious furrows, wear and diamond particles shedding on the tool surface. Conclusion In actual machining, it can enhance the durability of the tool by increasing the spindle speed, lowering the feed speed and reducing the depth of cut. By avoiding the resonance cutting parameters, the wear of the tool can be effectively reduced. The spindle speed, feed speed and depth of cut are respectively For 12000r / min, 500mm / min, 0.5mm when the cutting effect is better, with the smallest amount of tool wear.