BTA深孔钻射流孔参数的优化与仿真

针对射流孔几何参数对BTA深孔钻喉部流场的影响,对射流孔直径、角度与射流孔距离喉部的位置进行有限元数值模拟,提出一种最优的新型喉部结构。在设置有限元模型的湍流强度和耗散率基础上,进行不同几何参数的深孔钻头喉部结构的排屑能力对比试验,测量冷却液系统的冷却液出口断面流出平均速度。试验结果表明:最优喉部结构为?38mm BTA深孔钻头所组成的冷却系统,冷却液出口断面流出的平均速度提高9.6%,同时提高了冷却液系统整体的排屑能力。由相似定理得出,冷却液系统的排屑能力提高9.6%。

Optimization and Simulation of Jet Hole Parameters of BTA Deep Hole Drilling

In view of the influence of geometric parameters of jet holes on the flow field at the throat of BTA deep hole drilling,finite element numerical simulation is carried out on the diameter,angle and position of jet holes from the throat that affect the suction performance of jet holes.An optimal new throat structure is proposed.Based on the turbulence intensity and dissipation rate of the finite element model,the chip removal capacity of the deep-hole bit throat structure with different geometric parameters is compared and the average outflow velocity of the coolant outlet section of the coolant system was measured.The results show that the cooling system composed of the∅38mm BTA drill with the optimal throat structure in the experiment the average speed of outflow from the coolant outlet section is increased by 9.6%,and the chip removal capacity of the coolant system as a whole is improved.According to the similarity theorem,the chip removal capacity of coolant system is increased by 9.6%.