Characteristics of deep hole processing
Deep hole definition
Deep hole processing can be divided into two types: shallow hole processing and deep hole processing, and medium deep hole processing between them. It is generally stipulated that the ratio of the hole depth L to the aperture D is greater than 5, that is, the hole L/d > 5 is called the deep hole; the hole with L/d less than 5 is called the shallow hole.
1, the knife rod is limited by the aperture, the diameter is small, the length is large, the rigidity is poor, the strength is low, and the vibration, ripple and taper are easily produced in the cutting, and the straightness and the surface roughness of the deep hole are affected.
2. In the case of drilling and reaming, the cooling lubricating fluid is difficult to enter into the cutting area without a special device, so that the tool durability is reduced and the cuttings are difficult.
3. In the process of deep hole processing, the cutting situation can not be observed directly. It can only be judged by the working experience to listen to the cutting sound, the iron chip, the hand touch vibration and the workpiece temperature, and the meter (oil pressure and current monitoring meter) to judge whether the cutting process is normal.
4. Chip removal is difficult. Reliable means must be adopted to chip breaking and control the length and shape of chips so as to facilitate smooth removal and prevent chip blockage.
5. In order to ensure the smooth operation of deep holes and to meet the required processing quality, the cutters inside (or outside) device, tool guide and support device and high pressure cooling lubricating device should be added.
6, the poor heat dissipation condition of the tool and the increase of cutting temperature make the tool durability decrease.
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