Turning tool application taboos
Application taboos for precision high-pressure internally cooled cylindrical turning tools in processing titanium alloys
According to the structure of titanium components, titanium alloys can be divided into three categories: α, α-β and β titanium alloys. Among them, alpha titanium alloy has the best machining performance. From alpha-beta to beta titanium alloy, the machining performance becomes worse and worse. Since titanium alloy materials have cutting characteristics such as small deformation coefficient, high cutting temperature, large cutting force per unit area, severe chilling and hardening phenomena, and easy tool wear, the tool material is required to have wear resistance, plastic deformation resistance, oxidation resistance, and high Strength and sharp edge characteristics.
Since the thermal conductivity of titanium alloy is very small, most of the heat generated by cutting is transferred to the tool, so the cutting temperature at the contact surface between the chip and the tool is very high. Cutting fluid should always be used when turning titanium alloy. The cutting fluid flow should be large and direct. However, the traditional cutting fluid nozzle device always exposes the smallest area of the blade outside the cooling zone. The large amount of chips prevents the cutting fluid from reaching the cutting area of the blade, making it impossible for the cutting fluid to penetrate between the chips and the blade. Using high-precision cutting fluid supply technology, the cutting fluid can penetrate the heat-affected zone and cool the blade more effectively. Not only can complete chip control and temperature control be achieved, the cutting speed can be accelerated by 20%, and the tool life can be extended by 50%. Significantly improves chip breaking.
The comparison between precision high-pressure cooling and traditional cutting fluid nozzle cooling is shown in the figure below.
Using precise high-pressure internal cooling tools to process titanium alloy materials can allow the cutting fluid to penetrate the heat-affected zone, which can cool the blade more effectively, reduce the contact area between chips and blades, reduce cutting heat, improve processing efficiency, and extend tool life. However, such tools There are some special requirements for the selection of machine tools and cutting fluids. The specific application taboos are as follows.
