Chinese 
English
Definition of deep hole drilling
There are two kinds of deep hole drilling: processing shallow hole, processing deep hole, and also including the medium deep hole between the above two degree. Usually when the drilling depth L and drilling hole diameter D’s draw ratio is bigger than 5 times, we called deep hole, otherwise we called shallow hole.
Processing characteristic
1. Because of the limit of drilling hole diameter and long drilling depth, the drill shank is in poor rigidity and poor intensity, when drilling, it easy to cause shaking, flow mark and taper, which also will effect the linearity and surface roughness.
2.When drilling and reaming, without special device ,thecoolant and lubricate oil are difficult to enter to the cutting area, which decrease the life service of gun drill and increase the difficulty of chip removing.
3.During the deep hole processing, we can’t see the processing procedure directly, but through working experience, length of chips, temperature of workpiece and view instrument (including the oil pressure and current monitoring device ) to judge the working condition.
4. It’s always difficult to remove the chips, and we have to take the certain methods to shorter the chips so that it’s easy to remove the chips and avoid blocking.
5. In order to get the required processing quality, there should be a chip removing guide box, tooling supporter and guide device, also high pressure coolant and lubrication machine.
6.The tooling is poor to spread the heat and the cutting temperature will be high, which will short the life service of the gun drilling tool.
If any more question, please feel free to contact us.
Email:gsmsxoffice@gmail.com
Whatsapp:+8618740435523
