摘要
针对深孔切削加工进行时,排屑效率低与钻头喉部易堵屑的问题,对BTA冷却系统冷却液出口断面速度,以及冷却液在钻头喉部的流动过程与特性进行了研究,基于计算流体动力学(CFD)与射流卷吸效应,提出了一种新型的BTA深孔钻头喉部结构。对加工时的压强和流量参数进行了分析后,修订了有限元冷却液模型的湍流强度和耗散速率,在此基础上进行了两种钻头喉部结构的排屑能力对比试验,测量了冷却液系统的冷却液出口断面流出平均速度。研究结果表明:实验时,新型喉部结构的直径38 mm BTA深孔钻头所组成的冷却系统,其冷却液出口断面流出的平均速度提高12.6%;同时,冷却液系统整体的排屑能力也得到了提高。
Aiming at the problems of low chip removal efficiency and easy chip plugging at the throat of drill bit during deep hole machining,the flow process and flow characteristics of the coolant in the throat of the bit and the cooling section exit velocity of the BTA cooling system were studied.Based on computational fluid dynamics(CFD)and jet entrainment,a new type of BTA deep hole drill throat structure was pro-posed.After analyzing the pressure and flow parameters,the turbulence intenisty and dissipation rate of the finite element model were re-vised.The chip removal capacity of two drill throat structures was compared and the average outflow velocity of coolant outlet section was measured on the modified finite element coolant system simulation model.The results indicate that the cooling system composed of a new type of deep-hole drill with a diameter of 38 mm BTA with throat structure increases the average speed of outflow from the coolant outlet section by 12.6%,and also improves the chip removal capacity of the coolant system.
作者
武瑞
沈兴全
陈振亚
WU Rui;SHEN Xing-quan;CHEN Zheng-ya(School of Mechanical Engineering,North University of China,Taiyuan 030051,China;Shanxi Deep Hole Processing Engineering Technology Research Center,Taiyuan 030051,China)
出处
《机电工程》
CAS
北大核心
2020年第1期92-95,102,共5页
Journal of Mechanical & Electrical Engineering
基金
山西省先进制造技术重点实验室开放基金资助项目(XJZZ20160)
山西省应用基础研究计划基金资助项目(201801D221231)
关键词
深孔加工
排屑效率
BTA深孔钻
喉部结构
deep hole machining
chip removal efficiency
BTA deep hole drilling
throat structure
