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Compared with normal hole processing, here is the characteristic ofdeep hole drilling:
1. For the precision, the requirement of deep hole drilling is from IT6----IT12, the surface roughness is Ra0.2um-----6.3um.
2. The processing condition of deep hole drilling is half closed ,you can’t observe the processing condition very directly, and also the space for chip removing is small,the heat is difficult to spread out,thus chip removing and coolant are the big question in deep hole drilling.
3. The rigidity of the technical system is poor. When processing, the stability is not so good,which is easy to cause shaking and deformation. Thus the hole precision and roughness are difficult to achieve the standard.
4. Usually the cutting depth is long, the chips are difficult to remove. When drilling, the temperature of tooling will arise, which will cause the gun drill broken.
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