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Drilling Precision Titanium Alloy Parts

Writer: Kangding Metal Pubdate:2019-09-07 Source:CNC machining
Description:It is difficult to drill titanium alloy. Burning and drill breakage often occur in the process of processing. The main reasons are poor grinding of drill bits, improper debris removal, poor cooling and poor rigidity of process system. (1) se...

It is difficult to drill titanium alloy. Burning and drill breakage often occur in the process of processing. The main reasons are poor grinding of drill bits, improper debris removal, poor cooling and poor rigidity of process system.

(1) selection of drill bits: For drills larger than 5mm in diameter, cemented carbide YG8 is the best tool material. High speed steel bits with hardness greater than 63HRC (e.g. M42 or B201) can be used to process holes less than 5mm, and inclined groove (short type) bits are used when the hole depth is less than twice the diameter. When the hole depth is more than twice the diameter, twist drill is used. Geometric parameters of drill bit: lambda = 0 ~3, alpha C = 13 ~15, 2=120 ~130.

In order to form chips easily, reduce friction and improve the cutting ability of drills.

The width of the guide edge band can be reduced to 0.1~0.3 mm according to the diameter of the drill bit, the cross edge can be grinded to 0.1D, and the top angle of double grinding can be 2_=130 ~140 and 2=70 ~80.

Table 4 lists the geometric parameters of the double front angle drill.

Geometric parameters of double front angle drill bit

Bit diameter (mm) - apex angle 2_ - second apex angle 2_0 - back angle of second edge a

> 3~6-130 ~140 -80 ~140 -12 ~18 -
> 6~10-130 ~140 -80 ~140 -12 ~18 -
> 10-18-125 ~140 -80 ~140 -12 ~18 -
> 18-30-125 ~140 -80 ~140 -12 ~18 -

(2) Cutting parameters
Carbide drill: V = 9-15m/min, f = 0.05-0.2mm/r; High-speed steel bit v = 4-5m/min, f = 0.05-0.3mm/r.

(3) When drilling deep or small diameter holes, manual feed can be adopted.
During drilling, the bit must be periodically withdrawn from the hole in order to remove chips.
In order to avoid severe wear and tear of the drill bit, the drill bit should not stay in the hole without retreating, otherwise the drill edge will rub against the working surface, causing hardening and blunting of the drill bit. Cooling and lubricating fluid must be adequately supplied when drilling. Usually soybean oil is used. If necessary, special oil for drilling and tapping of OLTIP in France can be added.
As far as possible to improve the rigidity of the process system, fix the drilling die on the workbench, the drilling die should be close to the processing surface, and shorten the bit as far as possible.

The wear rate at the back corner of the bit is 0.4-0.5 mm, which is taken as the standard of drill bluntness.

(4) Drilling examples:
A molybdenum high speed steel drill is used to drill a+beta TC4 titanium alloy workpiece. The diameter of the drill is D=6.35 mm and the depth of the hole is H=12.7 mm. Cutting parameters v=11.6m/min and f=0.127mm/r were selected and cooled by emulsion. Tool durability T is based on wear width of 0.38 mm after H. Each bit can drill 260 holes, and the effect is excellent.

Drilling Titanium Alloy Parts

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