Titanium alloy material is light in weight, has a density of 4.51 and high specific strength. It is an important metal material in aerospace and other fields. But its processing performance is poor, especially the efficiency of drilling and tapping is very low, which largely restricts the processing quality and production efficiency of titanium alloy parts in the product.
Performance characteristics of titanium alloy:
It is best not to use hydrogen-containing coolant when drilling and tapping titanium alloys to avoid the generation of toxic substances and hydrogen embrittlement. When drilling shallow holes, electrolytic cutting fluid can be used. Its composition is: Sebacic acid Y%}10%, Triethanolamine Y%}10%, Glycerin Y%}10%, Boric acid Y%}10%, Sodium nitrite 3 %}5%%, the remainder is water. When drilling deep holes, use N32 machine oil to add kerosene, the ratio of siji is 3:1. 5. Sulfurized cutting fluid can also be used.
1. Tapping of titanium alloy
Titanium alloy tapping processing, especially small hole tapping processing is very difficult. The main reason is due to the low thermal conductivity of the titanium alloy. During the tapping process, the cutting zone forms a high temperature, which causes the titanium alloy to thermally expand. In addition, the titanium alloy has a large rebound after processing, the hole wall squeezes the tap, and even covers the tooth profile , The tap cannot be rotated, otherwise the tap will be broken. After a lot of analysis and tests, the problem was solved by improving the structure of the tap and selecting suitable titanium alloy tool materials.
2. Tap structure
Standard taps are cut into shape at one time, with large cutting volume and large torque. After the hole wall thermally expands and rebounds, the taps are difficult to rotate. In order to solve this problem, the structure of the tap is improved, and the one-time cutting of the standard tap is divided into three-cone cutting, II, and II. At the same time, the tap is machined into a skipped tooth shape, which solves the problem of chip breaking. The problem is that the cutting is brisk, the effect is very good, the efficiency is greatly improved, and the cooling effect is also improved.
3. Coolant
The coolant used in the titanium alloy rose wire is the same as the coolant used in the drilling process.
Through the analysis of the characteristics of the titanium alloy, the problems in the drilling and tapping process of the titanium alloy are solved, and good results have been achieved. The following conclusions are drawn: (1) W2Mo9C-2 4Vo8 drill bits and taps are suitable for titanium alloy processing (2) Improving the geometric parameters of the drill bit can significantly improve the processing efficiency of titanium alloy parts; (3) Improving the structure of the tap can significantly improve the processing effect of titanium alloy parts; (4) Formulating suitable for titanium alloy The processed coolant can extend the life of the cutting tool.
www.crnmc.com 
