Process know-how for processing titanium alloys

On the basis of understanding the processing mechanism of titanium alloys, plus previous experience, the main process know-how for processing titanium alloys is as follows:

　　(1) Use positive-angle geometry inserts to reduce cutting force, cutting heat and workpiece deformation.

　　(2) Maintain a constant feed to avoid hardening of the workpiece. The tool must always be in the feed state during the cutting process. The radial tool engagement a e during milling should be 30% of the radius.

　　(3) Use high-pressure and large-flow cutting fluid to ensure the thermal stability of the machining process and prevent surface degeneration and tool damage caused by excessive temperature.

　　(4) Keep the cutting edge of the blade sharp. Blunt tools are the cause of heat build-up and wear, which can easily lead to tool failure.

　　(5) As far as possible, the titanium alloy is processed in a relatively soft state, because the material becomes more difficult to process after hardening. Heat treatment increases the strength of the material and increases the wear of the blade.

　　(6) Use a large tool nose arc radius or chamfer to cut in, and put as much cutting edge as possible into the cutting. This can reduce the cutting force and heat at every point and prevent local damage. When milling titanium alloys, among the cutting parameters, the cutting speed has a greater influence on the tool life vc, followed by the radial tool engagement (milling depth) ae.