Cnc Machining Titanium

- Jan 02, 2019 -

Characteristics and processing of cnc machining titanium 

Cutting characteristics: When the hardness of titanium alloy is greater than HB350, the cutting process is particularly difficult. When it is less than HB300, the sticking phenomenon is easy to occur and it is difficult to cut. However, the hardness of titanium alloy is only one aspect that is difficult to be machined. The key is the influence of the combination of chemical, physical and mechanical properties of titanium alloy on its machinability. Titanium alloys have the following cutting characteristics:

cnc machining titanium.jpg

 cnc machining titanium 

cnc machining titanium.jpg
 cnc machining titanium 


(1) Small deformation coefficient: This is a remarkable feature of titanium alloy machining, and the deformation coefficient is less than or close to 1. The distance of the sliding friction of the chips on the rake face is greatly increased, accelerating tool wear.


(2) High cutting temperature: Since the thermal conductivity of titanium alloy is very small (only equivalent to 1/5 to 1/7 of 45 steel), the contact length between the chip and the rake face is extremely short, and the heat generated during cutting is not easily transmitted. Out, concentrated in a small range near the cutting zone and the cutting edge, the cutting temperature is very high. Under the same cutting conditions, the cutting temperature can be more than doubled when cutting 45 steel.


(3) The cutting force per unit area is large: the main cutting force is about 20% smaller than that when cutting steel. Since the contact length between the chip and the rake face is extremely short, the cutting force per unit contact area is greatly increased, which is liable to cause chipping. At the same time, due to the small elastic modulus of the titanium alloy, bending deformation is easily caused by the radial force during machining, causing vibration, increasing tool wear and affecting the accuracy of the part. Therefore, the process system is required to have better rigidity.


(4) The chill phenomenon is serious: due to the high chemical activity of titanium, it is easy to absorb the oxygen and nitrogen in the air to form a hard and brittle outer skin at high cutting temperature; at the same time, the plastic deformation during the cutting process will also cause surface hardening. . The chilling phenomenon not only reduces the fatigue strength of the part, but also aggravates the tool wear, which is an important feature when cutting titanium alloy.


(5) The tool is easy to wear: the blank is processed by stamping, forging and hot rolling to form a hard and brittle uneven skin, which is easy to cause chipping, which makes the removal of the hard skin the most difficult process in the processing of titanium alloy. In addition, due to the strong chemical affinity of the titanium alloy for the tool material, the tool is prone to bond wear under conditions of high cutting temperature and large cutting force per unit area. When machining titanium alloys, sometimes the wear of the rake face is even more serious than that of the flank; when the feed rate is f<0.1 mm/r, the wear mainly occurs on the flank face; when f>0.2 mm/r The rake face will wear out; when using a carbide tool for finishing and semi-finishing, the wear of the flank face is preferably VBmax < 0.4 mm.

cnc machining titanium.jpg
 cnc machining titanium 

cnc machining titanium.jpg
 cnc machining titanium 

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