Some people think that processing titanium is a very difficult thing. Actually it is not. As long as you master certain skills, the difficulty of processing titanium will be greatly reduced. It's time to share tips and tricks!
The recommended cutting speed less than 60 m/min for roughing and 3-4 times that when finishing. Otherwise, thermal softening, as well as chemical reaction between tool and workpiece, may occur. Feedrates are entirely dependent upon chip loads as well as other elements, but should be large enough to prevent work hardening. Follow cutting tool manufacturers recommendations.
Titanium conducts heat very slowly. During machining operations, this poor thermal conductivity traps heat in the work zone, severely damaging cutting tools. If your machine setup can handle the additional load, consider raising the feedrate to transfer more heat into the chips.
Titanium is extremely tough. Use a positive rake geometry. The cutting tool should have a tough substrate and hard coating. The tool must be sharp.
Because of the high heat and stringy chips, a copious flow of clean cutting fluid is required.
Filtration to 25-micron or better is critical. Increase its concentration to at least 10%, and install a high-pressure pump of 500 psi or more to remove chips from the work area. Use coolant-fed cutting tools, with inserts that enhance chip control. Invest in a high-quality machine tool if you are serious about titanium.
Titanium will grab end mills under heavy loads, leading to scrapped workpieces and broken tools. Get no-fail toolholders for your cutters, and hydraulic vises with hardened and ground jaws for clamping titanium parts.
The correct toolpath is important when machining titanium. Use the same techniques as for high feed machining (HFM). Trochoidal milling paths will roll to the cut and not slow down at the corners.
Above all, develop a sound machining procedure prior to the first cut. Analyze all of the part features, taking special consideration of unsupported areas, tall or thin walls and difficult to reach features. Plan your moves carefully. Use the right cutters, feeds and speeds, and generate toolpaths to meet the above conditions.