平底立铣刀的切削力尺寸效应研究及其系数估算
发布时间：2019-03-31 09:46
【摘要】：检验基于三元切削力机理模型的平底立铣刀尺寸效应,并探索一种简便的切削力系数估算方法。论证了在切削厚度较小时可忽略刀具螺旋角对切削力的影响,据此构建平底立铣刀单个刀齿的三元切削力简化模型。基于该模型,用各齿径向跳动量补偿瞬时切削厚度,用切削试验数据拟合各齿切削力峰值与切削深度及瞬时切削厚度的线性方程式,发现各拟合式的确定系数总体上接近1,表明同一刀齿的切削力系数大体为常数,这意味着平底立铣刀的尺寸效应不显著。据此采用刀具的平均切削力峰值估算切削力系数,该方法不用考虑刀具偏心,且计算比较简便,模拟得到的切削力波形与实测波形相近,表明估算方法比较有效。研究结果可供铣削力尺寸效应机理研究及平底立铣刀应用领域参考。
[Abstract]:The size effect of flat-bottom end milling cutter based on the three-dimensional cutting force mechanism model is tested and a simple method for estimating the cutting force coefficient is explored. The influence of cutter helix angle on cutting force can be neglected when the cutting thickness is small. Based on this, a simplified model of three-dimensional cutting force for a single cutter tooth of flat-bottom end milling cutter is established. Based on this model, the instantaneous cutting thickness is compensated by the radial jump momentum of each tooth. The linear equations between the peak cutting force and the cutting depth and the instantaneous cutting thickness of each tooth are fitted with the cutting test data. It is found that the determination coefficients of each fit are generally close to 1. It is shown that the cutting force coefficient of the same cutter is generally constant, which means that the size effect of the flat end milling cutter is not significant. Based on this, the average cutting force peak value of the tool is used to estimate the cutting force coefficient. This method does not need to consider the cutter eccentricity, and the calculation is simple. The simulated cutting force waveform is similar to the measured one, which shows that the method is effective. The results can be used as reference for the study of the mechanism of milling force size effect and the application of flat-bottom end-milling cutter.
【作者单位】： 广东海洋大学工程学院;
【基金】：国家自然科学基金资助项目(51375099,51375100)
【分类号】：TG714
[Abstract]:The size effect of flat-bottom end milling cutter based on the three-dimensional cutting force mechanism model is tested and a simple method for estimating the cutting force coefficient is explored. The influence of cutter helix angle on cutting force can be neglected when the cutting thickness is small. Based on this, a simplified model of three-dimensional cutting force for a single cutter tooth of flat-bottom end milling cutter is established. Based on this model, the instantaneous cutting thickness is compensated by the radial jump momentum of each tooth. The linear equations between the peak cutting force and the cutting depth and the instantaneous cutting thickness of each tooth are fitted with the cutting test data. It is found that the determination coefficients of each fit are generally close to 1. It is shown that the cutting force coefficient of the same cutter is generally constant, which means that the size effect of the flat end milling cutter is not significant. Based on this, the average cutting force peak value of the tool is used to estimate the cutting force coefficient. This method does not need to consider the cutter eccentricity, and the calculation is simple. The simulated cutting force waveform is similar to the measured one, which shows that the method is effective. The results can be used as reference for the study of the mechanism of milling force size effect and the application of flat-bottom end-milling cutter.
【作者单位】： 广东海洋大学工程学院;
【基金】：国家自然科学基金资助项目(51375099,51375100)
【分类号】：TG714
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