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耐热材料可加工性低的原因在于:钻头的刚性小、沿整个切削刃长度切削速度发生变化以及在刀刃各点上切削部分的几何形状不稳定。当钻孔深度超过孔径二倍时,加工条件急剧变坏。产生这种现象的原因是由于切屑堆积在钻头沟槽内,因此大大减少了进入切削区域的冷却液数量和提高了钻头的温度。这些便导致钻头的迅速磨损或折断,降低加工生产率。在古比雪夫工学院工具科研生产实验室对直径16—40毫米(ΓОСТ10903—64)的钻头进行的试验表明,加工耐热材
The reason why the workability of the heat-resistant material is low is that the drill bit is small in rigidity, that the cutting speed varies along the entire cutting edge length, and that the geometry of the cut portion is unstable at each point of the cutting edge. When the drilling depth exceeds twice the aperture, the machining conditions deteriorate sharply. The reason for this phenomenon is that the amount of coolant entering the cutting area and the temperature of the drill bit are greatly reduced due to the accumulation of chips in the drill bit groove. These can result in rapid wear or breakage of the bit, reducing process productivity. Experiments conducted at the Kuobyshoff Institute of Tool Research and Production Laboratory on drill bits 16 to 40 mm in diameter (ΓОСТ 10903-64)