New development of titanium alloy grinding and polishing technology

(1) Fine grinding
That is, all kinds of conventional emery rubber wheels are used to grind the surface of titanium and titanium alloy castings. The problem to pay attention to when grinding is still not to make the casting heat production, can not cause grinding injuries on the surface of the casting, and make the entire surface to achieve smooth.

(2) barrel grinding method
The so-called barrel grinding method is to put the machined castings, abrasives, water and additives into the barrel grinding tank, the grinding barrel produces rotation and vibration, so that the mixture of abrasives and the machined castings produce friction, and the surface of the castings is polished and smooth. It is characterized by no dust pollution, low labor intensity, and no heat production in the conventional grinding process. At present, Japan has commercialized barrel grinding machines and abrasives for the grinding of titanium alloy castings, other metal castings and plastics. After the test confirmed that the pk series of abrasive grinding efficiency is the highest, but the surface roughness is also the highest. Although the grinding efficiency of SA and B series abrasives is not as good as PK, the surface smoothness of titanium castings after grinding is the highest. At present, the Fourth Military Medical University has successfully developed the first dental barrel grinder in China.

(3) Mechanical polishing method
A method of polishing titanium and titanium alloy surfaces with a soft cloth or a black brush of different sizes dipped in titanium and a special polishing paste containing titanium alloy. When polishing titanium castings, it must be completely clear that the surface contamination layer of the castings and no new grinding hardening layer occur, and the ideal polishing effect will not be achieved. When polishing, high speed and light pressure should be used. The author has also tested the use of green polishing paste to polish titanium and titanium alloy castings, and obtained a better polishing effect. After polishing titanium and titanium alloy castings can not be immediately washed, must be completely formed before the surface oxide film can be washed, otherwise the surface will produce darkening phenomenon.