深孔加工由于排屑困难,故不易提高其生产效率。随着硬质合金深孔钻头的出现,高速钻削过程中产生的大量铁屑使深孔加工中的排屑问题更加突出。国內目前采用的比较普遍的深孔加工方式是利用从工件——钻杆间进入的高压油在返回时的剩余压力排出铁屑。在国外,这种加工方式一般称为BTA Deep hole processing due to difficult chip removal, it is not easy to increase its production efficiency. With the advent of cemented carbide deep hole drills, a large amount of iron filings generated during high-speed drilling have made the problem of chip evacuation in deep hole machining more prominent. At present, the most popular method of deep-hole processing in China is to use the residual pressure of the high-pressure oil entering from the workpiece to the drill pipe to return iron filings. Abroad, this processing method is generally referred to as BTA