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首页> 外文期刊>Mechanics & Industry >Experimental and analytical analyses of the cutting process in the deep hole drilling with BTA (Boring Trepanning Association) system
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Experimental and analytical analyses of the cutting process in the deep hole drilling with BTA (Boring Trepanning Association) system

机译：BTA（镗孔钻削协会）系统在深孔钻削中切削过程的实验和分析分析

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摘要

This paper deals with analysis of the cutting process, on a macro and micro scale, in the deep hole drilling with BTA system. An experimental procedure is developed to highlight the impact of cutting speed and feed rate on the cutting process when machining the 18MND5 steel. Parameters based on dimensional characteristics of chips are introduced to quantify the morphology of chips generated by central, intermediate and external inserts of the complex BTA drilling tool. From observation of the chips morphology (flat, curved and spiral) and the measurement of the chips width, the provenance of each chip with respect to cutting inserts is identified. Then, the Chip Compression Ratio is evaluated for each cutting condition, indicating the amount of plastic strain in chips. Thanks to the introduction of a new parameter, denoted as Chip Fragmentation Ratio, it is found that the cutting speed has a little influence, compared to the feed rate, on the chips size. Based on this quantitative analysis, the optimal range of cutting conditions for the BTA deep hole drilling is discussed. It is mentioned that although increasing the feed rate promotes the chips fragmentation and increases the material removal rate (increasing productivity), an upper limit is to determine to prevent excessive flank wear. Also, the cutting speed should be limited to avoid excessive crater wear.
机译：本文从宏观和微观角度分析了BTA系统在深孔钻削中的切削过程。开发了一种实验程序，以突出说明加工18MND5钢时切削速度和进给速率对切削过程的影响。引入了基于切屑尺寸特征的参数，以量化由复杂BTA钻具的中央，中间和外部刀片产生的切屑的形态。通过观察切屑形态（平坦，弯曲和螺旋形）和切屑宽度的测量，可以确定每个切屑相对于切削刀片的出处。然后，针对每种切削条件评估切屑压缩比，表明切屑中的塑性应变量。由于引入了一个新的参数，称为切屑碎片率，因此发现切削速度与进给速度相比，对切屑尺寸的影响很小。在此定量分析的基础上，讨论了BTA深孔钻削的最佳切削条件范围。提到尽管增加进给速度会促进切屑碎裂并增加材料去除率（提高生产率），但是确定上限是为了防止侧面磨损过多。另外，应限制切割速度，以避免过度的月牙洼磨损。

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