First, the cutting speed:
Cutting speed is an important factor affecting the blade temperature. Too fast cutting speed will lead to overheating of the blade, serious adhesion and diffusion wear of the blade, frequent regrinding of the tool and shortened tool life. At the same time, it will lead to surface cracking or oxidation of titanium alloy workpiece, which will affect its mechanical properties. Therefore, under the premise of ensuring the durability of the tool, we should choose the appropriate cutting speed to reduce the cost and ensure the machining quality.
Second, the feed rate and feed rate:
The change of feed speed has little effect on temperature, so it is reasonable to reduce cutting speed and increase feed speed. If there is oxide layer and subcutaneous blowhole layer, large cutting depth can directly cut to the metal layer which is basically not oxidized, which improves the tool life.
Third, the geometric angle of the tool:
When cutting titanium alloy, it will have an important influence on cutting efficiency and tool life to select the geometric parameters such as rake angle and rake angle suitable for machining method and properly handle the tool tip.
Experiments show that in order to improve the heat dissipation condition and strengthen the cutting edge, the rake angle is generally 5 ~ 9; In order to overcome the friction caused by springback, the flank of the cutter body is generally10 ~15; When drilling, the durability of the drill bit can be improved several times by shortening the length of the drill bit and increasing the thickness of the drill core and the number of guide cones.
Four, the clamping force of fixture:
Titanium alloy is easy to deform, and the clamping force should not be too large, especially in the finishing process, certain auxiliary support can be selected.
Five, cutting fluid:
Cutting fluid is an indispensable process lubricant in titanium alloy processing. Cutting fluid can not only effectively reduce the cutting temperature, reduce the heat generated by the friction between the tool and cutting, but also play the role of lubricant in the cutting process, reduce the adhesion between titanium alloy chips and the tool surface, improve efficiency, reduce costs and prolong the tool life. However, cutting fluids containing chlorine or other halogen elements and sulfur cannot be used, which will adversely affect the mechanical properties of titanium alloys.