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Introduction to five major principles of machining titanium alloy components

May 29, 2018

Five major principles of machining titanium alloy components have been discussed recently on the Internet by many insiders. Below information is sort out to share with you and help you learn about relevant knowledge.
Introduction to five major principles of machining titanium alloy components
1) Cutting speed
Cutting speed is an important factor to influence the blade’s temperature. High cutting speed will cause overheated blades, adhering blades and serious diffusive wear. The cutter is sharpened frequently, which will shorten its service life. Meanwhile, it will make titanium alloy workpieces’ surface cracked or oxidized, thus influencing workpieces’ mechanical properties. Therefore, on the premise of ensuring the cutter’s relatively long service life, proper cutting speed should be chosen to reduce cost and ensure machining quality.
2) Depth of cutting and the feed
Changes of the feed have little influence on the temperature. Therefore, the reasonable cutting method is to decrease the cutting speed and increase the feed. If there are surface oxide layer and subsurface pore layer, deep cutting could directly cut the unoxidized metal layer and increase the cutter’s service life.
3) Cutter’s geometric angle
When cutting titanium alloy, choose geometric parameters, like rake angle and relief angle, which are suitable for the machining method, and have the cutter’s nose properly handled, which will have a significant influence on cutting efficiency and the cutter’s service life.
Tests have shown that, when having lathe turning, 5°~9° rake angle is usually chosen to improve heat emission and strengthen the cutting edge; 10°~15° angle of the cutter’s flank surface is usually chosen to overcome rebound-related abrasion; when drilling holes, shorten the drill’s length, increase the core bit’s thickness and the guide cone’s quantity to increase the drill’s durability by several times.
4) Clamping force of fixtures
Titanium alloy is easy to deform, so the clamping force should not be too strong, especially during the finish machining. Certain auxiliary support could be used.
5) Cutting fluid
Cutting fluid is the necessary lubricating oil for titanium alloy machining. Cutting fluid could not only effectively lower the cutting temperature and reduce heat caused by abrasion between the cutter and cuttings, but also be used as the lubricant during the cutting process to reduce adhesion betweentitanium alloy’s cuttings and the cutter’s surface, improve efficiency, reduce cost and extend the cutter’s service life. But cutting fluid containing chlorine or other halogen elements or sulfur could not be used. Such kind of cutting fluid will have a negative influence on titanium alloy’s mechanical properties.

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