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系列引射钻存在的主要缺点是:排屑条件随着钻秆长度的改变而改变:供至引射钻的冷却润滑液的总量与引射喷管的流体阻力、环隙(钻杆与钻杆内管之间)和钻头排出孔的流体阻力的总和成反比;当钻杆长度改变时,环隙的流体阻力会发生改变;在加工区内钻头的直径相同,而长度不同,射入的冷却润滑液数量就不同。这都会导致或者是排屑的条件变坏或是冷却润滑液通过钻杆与加工孔壁之间的间隙向外泄漏。为了在钻杆长度改变时稳定排屑条件,研制成一
The main disadvantages of the series of lead drills are that chip evacuation conditions vary with the length of the drill stem: the total amount of cooling lubricant supplied to the pilot drill and the fluid resistance of the pilot nozzle, annulus Drill pipe inner tube) and the drill hole discharge fluid resistance is inversely proportional to the total; when the length of the drill pipe changes, the annulus fluid resistance will change; in the processing area of the same drill diameter, and the length of different injection The amount of cooling lubricant is different. This will either result in either chip evacuation or cooling lubricant leaking out through the gap between the drill pipe and the wall of the machined hole. In order to change the length of the drill pipe chip evacuation conditions, developed into one