鈦合金加工時應注意的問題

鈦合金CNC車銑加工過程中, 應注意的事項是:
(1) 由於鈦合金的彈性模量較小, 加工時工件的裝夾變形與受力變形較大, 會降低工件的加工精度; 安裝工件時夾緊力不宜過大, 並可依需求添加輔助支撐.

(2) If a cutting fluid containing chlorine is used, it will decompose and release hydrogen at high temperatures during machining, 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 also decompose or volatilize toxic gases when used. Safety protection measures should be taken during processing and use, otherwise it should not be used;
After cutting, clean the parts thoroughly with a chlorine-free cleaning agent in time to remove chlorine residues.

(4) It is forbidden to use lead or zinc-based alloy tools and fixtures to contact titanium alloys, and copper, tin, cadmium and their alloys are also forbidden to use.

(5) All tools, fixtures or other devices in contact with titanium alloys must be clean; The cleaned titanium alloy parts should be prevented from being contaminated by grease or fingerprints, otherwise it may cause salt (sodium chloride) stress corrosion in the future.

(6) Under normal circumstances, there is no risk of ignition when CNC cutting titanium alloys. Only in the micro-cutting, the cut small chips will ignite and burn. In order to avoid fire, in addition to pouring a large amount of cutting fluid, it is also necessary to prevent the accumulation of chips on the machine tool. Replace the tool immediately after it is blunt, or reduce the cutting speed, and increase the feed rate to increase the chip thickness. In case of fire, fire extinguishing equipment such as talcum powder, limestone powder, dry sand, ETC. should be used to extinguish the fire. It is strictly forbidden to use carbon tetrachloride and carbon dioxide fire extinguishers, nor to water, because water can accelerate the combustion and even cause hydrogen explosion.

鈦加工時的注意事項