Matters needing attention in the processing of titanium alloy parts

The cutting process of titanium alloy is powerful cutting, so the machine tool spindle driving force is large and the cutting function is strong. In the aerospace industry, the processing of titanium alloy parts is mainly in the milling of cavities. To facilitate chip removal, cooling and lubrication devices should be managed. In order to facilitate the removal of chips, the cooling and lubricating device should be managed so that a large amount of high-pressure cooling lubricant can be sprayed directly. Knife. In this way, on the one hand, the tool can be cooled, on the other hand, the chips can be washed out of the processing area in time to prevent the chips from being cut multiple times, thereby shortening the tool life. and scratch the machined surface. In order to make the machine tool have high-power cutting function, titanium processing parts manufacturers have designed the product structure and coordinate axis structure in a targeted way, and equipped with powerful cutting and swing units, with excellent rigidity to install the tool spindle, so the machine tool is in a vertical, horizontal and spatial state. The same cutting force can be generated at any angle.

Titanium alloys are characterized by high strength and poor thermal conductivity. In order to achieve the same cutting efficiency as the processing of aluminum, it is necessary to increase the cutting parameters as much as possible, that is, to increase the amount of gold and the depth of cut, resulting in increased cutting force, which may lead to static deviation between the workpiece. and tools, which may cause damage to parts. The shape accuracy is reduced or the machining process is unstable, which also accelerates the wear of the tool. Therefore, the machine tool for titanium alloy processing must have high power and have static and dynamic characteristics (high static and dynamic stiffness); it also needs to be equipped with corresponding high-pressure cooling and lubricating equipment for low-speed, high-torque processing. Clean the chips in time to reduce tool wear and reduce the heat generated during machining. In order to improve the rigidity of machine tools, some machine tool manufacturers use welded steel structures in box structures or closed frames. The high-power feed motor drive of the feed shaft and the high-rigidity gapless guide system can be fixed in the processing position to further improve the rigidity of the machine. In addition, the entire system including the spindle tool linkage portion and the tool shank must be improved. stiffness during machining.

In addition to the static stiffness, the dynamic characteristics of the machine tool also play a decisive role in the effective machining of titanium alloys. The stability of the control process is a great challenge. If the rigidity of the machine tool is low and the damping characteristics are poor, self-excited vibration may occur due to the high cutting force in the cutting process, the rotation speed is low and the excitation frequency is close to the natural frequency of the machine tool. itself, resulting in tremor during processing. In addition to affecting the surface quality of the workpiece (with vibrating lines), this vibration can also damage the machine structure, tool Zhuzhou and tools. Increased tool wear and even fracture. The stability of the machining process depends mainly on parameters such as the spindle speed and the selected depth of cut. The user should know the performance of the machine and the limit cutting depth that can be achieved. It can also actively place the anti-vibration pad on the machine tool, and pre-place parameters in the machine tool control equipment to avoid the limited range of cutting depth. Vibration measures can further improve the shock resistance of the machine.

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