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According to the different requirement of deep hole drilling, the choice of tooling is very important. In the common processing, there are several kinds of tooling: flat drill, twist drill, external chip removing tooling, internal chip removing tooling, double-tube tooling and gun drill.
Here are the details of some tooling:
1) Flat drill: from the structure of the flat drill, there are two kinds of flat drill: integral flat drill and assembly flat drill. Compared with integral flat drill, the structure is simple,and easy to manufacture and process, fit for the high hardness material and forging piece.
2) Twist drill: it has a wide range of processing and usually apply in the rough processing.
3) Internal chip removing tooling: normally, it’s single and double blades gun drilling tools. The working principle is: the high pressure enter into the drill shank, through the drill bit to the cutting area, and force the chips remove from the V shape groove to the outside.
4) Internal chip removing tooling(also named BTA deep hole drilling system): there is a screw between the drill head and drill tube. When working, the high pressure oil enter from the outside drill tube,and remove the chips from inside part of the dill tube. And it’s mainly used in drilling deep hole diameter bigger than 16mm.
5) Double-tube tooling: because drill stem contains inner tube and outer tube, so it is called double tube deep hole drilling. Compared with BTA system, the requirement of coolant oil pressure is lower, simultaneously, lower the sealing requirement of drilling system.
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