In the process of cutting titanium alloy, matters that should be paid attention to are:
(1) Due to the small elastic modulus of titanium alloy, the clamping deformation and force deformation of the workpiece during processing are large, which will reduce the processing accuracy of the workpiece; the clamping force should not be too large when the workpiece is installed, and auxiliary supports can be added if necessary.
(2) If chlorine-containing cutting fluid is used, it will decompose and release hydrogen at high temperatures during the cutting process, which will be absorbed by titanium and cause hydrogen embrittlement; it may also cause high-temperature stress corrosion cracking of titanium alloys.
(3) The chloride in the cutting fluid may decompose or volatilize toxic gases when used. Safety precautions should be taken when using it, otherwise it should not be used; parts should be thoroughly cleaned with chlorine-free cleaning agent immediately after cutting to remove chlorine-containing residues things.
(4) It is prohibited to use tools and fixtures made of lead or zinc-based alloys to come into contact with titanium alloys. The use of copper, tin, cadmium and their alloys is also prohibited.
(5) All tools, fixtures or other devices in contact with titanium alloy must be clean; cleaned titanium alloy parts must be prevented from being contaminated by grease or fingerprints, otherwise it may cause stress corrosion from salt (sodium chloride) in the future.
(6) Under normal circumstances, when cutting titanium alloys, there is no danger of ignition. Only in micro-cutting, the small chips cut will ignite and burn. In order to avoid fires, in addition to pouring a large amount of cutting fluid, chips should also be prevented from accumulating on the machine tool. The tool should be replaced immediately after it is blunt, or the cutting speed should be reduced and the feed rate should be increased to increase the chip thickness. If a fire breaks out, fire extinguishing equipment such as talcum powder, limestone powder, and dry sand should be used to extinguish the fire. It is strictly forbidden to use carbon tetrachloride and carbon dioxide fire extinguishers, and watering is not allowed, because water can accelerate combustion and even cause a hydrogen explosion.
