What is a deep hole?
A deep hole is one in which the ratio of the length of the hole to the diameter of the hole is greater than 10. For general deep holes, the ratio of depth to diameter is L/d≥100 in most cases. Such as oil cylinder hole, axial oil hole of the shaft, hollow main shaft hole and hydraulic valve hole and so on. Among these holes, some require higher machining accuracy and surface quality, and some are processed materials of poor machinability, often become a big difficulty in production. But as long as we make fair use of processing conditions, understand the processing characteristics of deep hole processing, grasp the processing method of deep hole, it can become difficult and not difficult.
Two, deep hole processing characteristics
1, the knife rod is limited by the aperture, small diameter, large length, resulting in poor rigidity, low strength, cutting easy to produce vibration, ripple, taper, and affect the straightness and surface roughness of the deep hole.
2, in the drilling and reaming, cooling lubrication fluid without the use of special devices, it is difficult to feed into the cutting area, so that the tool durability is reduced, and chip removal is difficult.
3, in the processing of deep hole, can not directly observe the cutting tool cutting situation, only by working experience to listen to the cutting sound, see chip, hand vibration and workpiece temperature, view the instrument (oil pressure meter and electricity meter), to determine whether the cutting process is normal.
4, chip removal is difficult, must use reliable means to break the chip and control the right and wrong of chip and shape, in order to facilitate the smooth removal, prevent chip blocking.
5, in order to ensure that the deep hole in the processing process smoothly and to meet the required processing quality, should be added to the cutting tool (or outside) chip removal device, tool guide and support device and high pressure cooling lubrication device.
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