Tips for rapid prototyping of titanium alloys
The material is a titanium alloy hand piece, which is often used in the aerospace industry. Its density generally reaches 4.51g / cm³. It has high strength, good rigidity, and light weight parts. , Skeletons, skins, fasteners and landing gear are generally made of titanium alloys. Many cnc processing manufacturers are helpless when processing titanium alloys. In fact, titanium alloy processing is skillful. Aixi Hardware summarizes some titanium alloy processing techniques for everyone to share:
1. Use positive angle geometry inserts to reduce cutting force, cutting heat and workpiece deformation.
2. Titanium alloys should be processed in the softest possible state, because hardened materials become harder to process. Heat treatment increases the strength of the material and increases blade wear.
3. Use high-pressure and large-flow cutting fluid to ensure the thermal stability of the machining process and prevent workpiece surface degeneration and tool damage due to excessive temperature.
4. Maintain a constant feed to avoid hardening of the workpiece. During cutting, the tool must always be in the feed state. The radial cutting amount ae should be 30% of the radius during milling.
5. Keep the cutting edge of the blade sharp, and the blunt tool is the cause of heat build-up and wear, which easily leads to tool failure.
6. Use a large cutting edge arc radius or chamfer to cut in, and insert as many cutting edges as possible into the cutting. This can reduce the cutting force and heat at each point and prevent local damage. When milling titanium alloy, the cutting speed has the greatest influence on the tool life vc among the cutting parameters, followed by the radial cutting amount (milling depth) ae.
When the hardness of titanium alloy is greater than HB350, cutting is particularly difficult. When it is smaller than HB300, it is prone to knife sticking and difficult to cut. Therefore, the titanium processing problem can be solved from the blade. Blade groove wear during titanium alloy processing is local wear in the back and front along the cutting depth direction, and it is often caused by the hardened layer left in the previous processing. The chemical reaction and diffusion of the tool and the workpiece material at a processing temperature exceeding 800 ° C is also one of the reasons for the formation of groove wear. Because during the machining process, the titanium molecules of the workpiece gather in the front area of the blade and are "welded" to the blade under high pressure and high temperature, forming a chipping tumor. When the built-up edge is peeled from the blade, the carbide coating of the blade is taken away. Therefore, titanium alloy processing requires special blade materials and geometries.
Because the titanium alloy hand plate generates high heat during processing, a large amount of high-pressure cutting fluid must be accurately and timely sprayed onto the cutting edge to quickly remove the heat. Nowadays, there are also unique structures of milling cutters specially used for titanium alloy processing on the market, which can be better applied to titanium alloy hand plate processing.