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对深孔钻(如枪钻和BTA 系统刀具等)自导作用特性的研究总是和深孔加工中被钻孔的轴线偏离特性联系在一起的。本文研究了刀具上起自导作用的导向块与孔壁产生摩擦的影响,并对刀具导向套或刀杆支承的不对中被钻孔不直度的影响作了理论分析。实验结果和理论分析结果完全一致。这证明,工件旋转系统产生的孔的偏离小于刀具旋转系统所产生孔的偏离。根据种种试验,包括特殊形状工件的试验,本文对被钻孔轴线偏离的原因进行了研讨,进而闸明了钻削时多边形孔的形成和导向块的方位角有关,而且是由刀具轴线的同轴度超差造成的。
Studies of the self-guiding properties of deep hole drilling tools such as gun drills and BTA system tools are always linked to the axis deviating characteristics of the borehole in deep hole machining. In this paper, the influence of the self-guided guide block and the hole wall on the tool friction is studied, and the influence of the misalignment of the tool guide sleeve or cutter bar support on the hole straightness is analyzed theoretically. The experimental results are in good agreement with the theoretical analysis. This proves that the deviation of the holes generated by the workpiece rotation system is smaller than the deviation of the holes generated by the tool rotation system. According to a variety of tests, including experiments on specially shaped workpieces, this paper discusses the reasons for the deviation from the axis of the drill hole, and further clarifies that the formation of polygonal holes during drilling is related to the azimuth of the guide block and is caused by the coaxiality of the tool axis Out of tolerance caused by.