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Because titanium alloys have good characteristics of strong corrosion, high temperature resistance, and fatigue resistance, they are increasingly used in aerospace, nuclear energy, medical equipment and other fields. However, titanium alloys are relatively difficult to process metal materials. This article will Difficulties in analyzing titanium alloy parts and some precautions:
Difficulties in CNC processing titanium alloy parts
Titanium alloy has high chemical activity and can easily combine with gas impurities (oxygen, nitrogen, hydrogen, etc.) at high temperatures. After titanium is oxidized, it forms a brittle layer and the surface of the workpiece hardens, making it more difficult to process and prone to chipping.
During CNC machining of titanium alloy, the heat dissipation effect is not good, and the tool is often stuck, which causes great wear and tear on the blade. The tool often collapses and strikes. Especially the processing of shell workpieces is difficult, and it is easy for the tool to vibrate and cause deformation of the part. The surface quality cannot be guaranteed, it is prone to tooth-like ripples, the processing risk is high, and the accuracy cannot be guaranteed.
The elastic abrasive of titanium alloy is small, and it is easy to produce built-up edges during cutting, resulting in tool sticking.
Milling of titanium alloy products is difficult because milling is intermittent cutting and it is easy for chips to stick to the blade. When the chip-sticking tool cuts into the workpiece again, the chips are knocked off and take away a small piece of tool material. , forming a chip.
The clamping force when installing titanium alloy workpieces should not be too large. If necessary, auxiliary supports can be added.
During CNC processing, the fixture or all other devices must be clean.
Try not to use hydrogen-containing cutting fluids. If hydrogen-containing cutting fluids are used, take safety protective measures during CNC machining.
The tool coating should be selected well to avoid an “affinity” reaction between the titanium alloy and the titanium in the coating, causing the knife to stick.
When cutting, the cutting speed should be low, the feed rate should be moderate, the cutting depth should be deep, and the cooling should be sufficient.
Try to use universal standard milling cutters, mostly sharp-toothed milling cutters, and avoid using shovel-toothed milling cutters.
It is prohibited to use clamps made of lead or zinc-based alloys in contact with titanium alloys. The use of copper, tin, cadmium and their alloys is also prohibited.
The thermal conductivity of titanium alloy is low, and heat accumulates on the local surface of the workpiece during processing, so the cutting linear speed must be low, low rotation speed, and low feed.
Titanium alloys are prone to hardened layers during processing. It is necessary to choose the appropriate cutting amount and the cutting depth should be greater than the hardened layer.
When processing titanium alloys, cooling measures must be taken to prevent the tool tip temperature from being too high, which may cause the coating to fall off.
Care should be taken to prevent the cleaned titanium alloy parts from being contaminated by grease or fingerprints.
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