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Techniques for maintaining strict tolerance requirements in machining titanium alloy precision parts
Hard-cutting materials such as titanium alloy have been widely used in the aerospace industry for their excellent high-temperature properties. However, this hard-cut material is difficult to work with. High cutting force and cutting temperature in the cutting process, serious Tool wear in the CNC machining process, resulting in low machining efficiency. In order to improve the cutting performance and milling efficiency of titanium, a tool-workpiece meshing optimization method was proposed. The thermal-mechanical coupling effects of flat-end milling titanium alloy under different tool-workpiece effects were simulated and analyzed. According to the comparison results, it is suggested to optimize the cutting conditions to control the cutting force and temperature and improve the machining efficiency.
CNC machining of titanium alloy is difficult to drill, often appearing in the CNC machining process and the phenomenon of cutting tools and breaking drills. This is mainly due to the poor grinding of the bit, the chip removal is not timely, the cooling is not good and the rigidity of the processing system is poor. Therefore, the following points should be paid attention to in the drilling of titanium alloy: tool material: high-speed steel M42, B201, or hard alloy. Reasonable bit grinding: increase the top Angle, reduce the front Angle of the outer edge, increase the back Angle of the outer edge, and increase the inverted cone to 2 ~ 3 times of the standard drill bit. Remove the chip in time and pay attention to the shape and color of the chip. If the chip appears feathery or the color changes during drilling, it indicates that the bit has become dull, and the Blade should be changed in time.
Rapid tool wear caused by high-temperature cutting is the main problem in titanium alloy cutting. The thermal conductivity of the PCD Diamond Tool is several times that of a hard alloy. When machining titanium alloy, more cutting heat can be transferred to the outside of the cutting area through the tool, and the durability of the PCD tool can reach dozens of times that of the hard alloy tool. Polycrystalline cubic boron nitride (PCBN) tools are the second, TiC - based carbide tools, and ceramic tools are considered unsuitable for titanium alloy cutting due to poor durability and other reasons.
In the aspect of PCD tool Angle, when cutting titanium alloy, generally choose a smaller front tool Angle, in order to increase the contact length between the chip and the front tool surface; At the same time, a large clearance Angle is selected to reduce the friction between the side and the machined surface.
Rapid tool wear caused by high-temperature cutting is the main problem in titanium alloy cutting. The thermal conductivity of the PCD diamond tool is several times that of a hard alloy. When machining titanium alloy, more cutting heat can be transferred to the outside of the cutting area through the tool, and the durability of the PCD tool can reach dozens of times that of the hard alloy tool. Polycrystalline cubic boron nitride (PCBN) tools are the second, TiC - based carbide tools, and ceramic tools are considered unsuitable for titanium alloy cutting due to poor durability and other reasons.
Titanium alloy grinding
Vitrification CBN Grinding Wheel, electroplated CBN grinding wheel, and vacuum brazing CBN grinding wheel are recommended for grinding titanium alloy.
1. Under ordinary grinding conditions, the grinding rate of the SiC grinding wheel on titanium alloy is only about 1. If CBN grinding wheel is used, the grinding ratio will be increased by tens or even hundreds of times.
2. Compared with ordinary Abrasives, the thermal conductivity of superhard abrasives is significantly improved, and the material removal rate is higher.
3. Using CBN grinding wheel to grind titanium alloy can avoid frequent grinding wheel dressing and further improve grinding efficiency.
4. The surface quality of the CBN grinding wheel is better than SiC grinding wheel, the machining surface integrity is better, the macro crack and surface damage is relatively less, and the roughness of the CBN grinding wheel is better than SiC grinding wheel, and the comparison is made.
Product Categories : CNC Milling > Milling Brass/Copper Part
