PDF(Pubmed)
Abstract：
Current research studies devoted to cutting forces in drilling are oriented toward predictive model development, however, in the case of mechanistic models, the material effect on the drilling process itself is mostly not considered. This research study aims to experimentally analyze how the machined material affects the feed force (Ff) during drilling, alongside developing predictive mathematical-statistical models to understand the main effects and interactions of the considered technological and tool factors on Ff. By conducting experiments involving six factors (feed, cutting speed, drill diameter, point angle, lip relief angle, and helix angle) at five levels, the drilling process of stainless steel AISI1045 and case-hardened steel 16MnCr5 is executed to validate the numerical accuracy of the established prediction models (AdjR = 99.600% for C45 and AdjR = 97.912% for 16MnCr5). The statistical evaluation (ANOVA, RSM, and Lack of Fit) of the data proves that the drilled material affects the Ff value at the level of 17.600% (p < 0.000). The effect of feed represents 44.867% in C45 and 34.087% in 16MnCr5; the cutting speed is significant when machining C45 steel only (9.109%). When machining 16MnCr5 compared to C45 steel, the influence of the point angle (lip relief angle) is lower by 49.198% (by 22.509%). The effect of the helix angle is 163.060% higher when machining 16MnCr5.
摘要：
当前致力于钻井中切削力的研究面向预测模型开发，然而,在机械模型的情况下，材料对钻井过程本身的影响大多没有考虑。本研究旨在通过实验分析加工材料在钻孔过程中如何影响进给力（Ff），同时开发预测性数学统计模型，以了解所考虑的技术和工具因素对Ff的主要影响和相互作用。通过进行涉及六个因素的实验(饲料，切削速度,钻头直径,点角度,唇角,和螺旋角)在五个级别，对不锈钢AISI1045和表面硬化钢16MnCr5的钻孔过程进行了验证，以验证所建立的预测模型的数值准确性（C45的AdjR=99.600％，16MnCr5的AdjR=97.912％）。统计评估(方差分析，RSM,和缺乏拟合）的数据证明，钻孔材料在17.600％（p<0.000）的水平上影响Ff值。进给量的影响在C45中为44.867％，在16MnCr5中为34.087％；仅加工C45钢时，切削速度显着（9.109％）。与C45钢相比，16MnCr5加工时，点角度（唇角）的影响降低了49.198％（22.509%）。加工16MnCr5时，螺旋角的影响要高出163.060%。
