Titanium alloys are difficult to drill, and burn-out and broken drills often occur during processing. This is mainly due to poor grinding of the drill bit, inadequate chip removal, poor cooling, and poor rigidity of the process system. Therefore, the following points must be noted in the drilling of titanium alloys:
Tool material: high-speed steel M42, B201 or cemented carbide.
Reasonable bit sharpening: Increase the apex angle, reduce the outer rake angle, increase the outer rim back angle, and increase the inverted cone to 2-3 times of the standard drill bit.
Qin back tool and remove chips in time, pay attention to the shape and color of chips. If the chips appear plume or color changes during drilling, it indicates that the drill bit is blunt, and the blade should be changed and sharpened in time.
Add enough cutting fluid: generally use soybean oil, if necessary, add French OLTIP drilling and tapping special oil.
Improve the rigidity of the process system: the drill mold should be fixed on the worktable, the guide of the drill mold should be close to the processing surface, and the short drill bit should be used as much as possible.
Another notable problem is that when manual feed is adopted, the drill bit must not advance or retreat in the hole, otherwise the drill edge rubs against the machining surface, causing work hardening and dulling the drill bit.