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September 30, 2021
The high temperature generated during the cutting process also destroys the surface integrity of the titanium alloy parts, resulting in a decrease in the geometric accuracy of the parts and a work hardening phenomenon that severely reduces its fatigue strength.
The elasticity of titanium alloy may be beneficial to the performance of parts, but during the cutting process, the elastic deformation of the workpiece is an important cause of vibration. The cutting pressure causes the "elastic" workpiece to leave the tool and rebound, so that the friction between the tool and the workpiece is greater than the cutting action. The friction process also generates heat, which aggravates the problem of poor thermal conductivity of titanium alloys. This problem is even more serious when processing thin-walled or ring-shaped parts that are easily deformed. It is not an easy task to process thin-walled titanium alloy parts to the expected dimensional accuracy. Because when the workpiece material is pushed away by the tool, the local deformation of the thin wall has exceeded the elastic range and plastic deformation occurs, and the material strength and hardness of the cutting point increase significantly. At this time, machining according to the originally determined cutting speed becomes too high, which further leads to sharp tool wear.
The above is a conventional view, but also limited to the factors of processing equipment. The latest research results show that the heat of titanium alloy processing particles is extremely high, and the local heat formed is very large. Although the cooling performance of water-soluble cutting fluid is preferred, it has vaporized before reaching the cooling area. In fact, water-soluble cutting fluid is used The average temperature in the center area of the slab is more than 2 times higher than that of the oil-based cutting fluid, and the cutting process results are not ideal.
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