The difficulty of processing titanium alloy precision parts is actually not high, because you have not found（1） the right method

1. Physical phenomena of titanium processing

The cutting force of titanium alloy precision parts is only slightly higher than that of steel with the same hardness, but the physical phenomenon of processing titanium alloy is much more complicated than that of steel, which makes titanium alloy processing facing huge difficulties.

The thermal conductivity of most titanium alloys is very low, only 1/7 of steel and 1/16 of aluminum. Therefore, the heat generated during the cutting of the titanium alloy will not be quickly transferred to the workpiece or taken away by the chips, but concentrated in the cutting area, the temperature can be as high as 1 000 ℃, so that the cutting edge of the tool quickly wears out, cracks and A built-up edge is generated, and the worn blade quickly appears, which causes more heat in the cutting area and further shortens the life of the tool.

The high temperature generated during the cutting process also destroys the surface integrity of the titanium alloy part, resulting in a decrease in the geometric accuracy of the part and a work hardening phenomenon that seriously reduces its fatigue strength.

The elasticity of the titanium alloy may be beneficial to the performance of the part, but during the cutting process, the elastic deformation of the workpiece is an important cause of vibration. The cutting pressure makes the "elastic" workpiece leave the tool and rebound, so that the friction between the tool and the workpiece is greater than the cutting effect. The friction process also generates heat, which exacerbates the problem of poor thermal conductivity of the titanium alloy.

This problem is even more serious when machining thin-walled or ring-shaped deformable parts, and machining titanium alloy thin-walled parts to the expected dimensional accuracy is not an easy task. 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 at the originally determined cutting speed becomes too high, which further leads to sharp tool wear.

 Titanium alloy precision parts are difficult to be "hot" is the "culprit"!