Processing method of titanium alloy
1. Titanium alloy turning and drilling
The main problems in turning titanium alloys are high cutting temperature, severe tool wear and large cutting springback. under proper processing conditions. Neither cornering nor tedious maneuvering is particularly difficult. For continuous cutting, mass production or high-volume metal cutting, carbide tools are often used. Suitable for adjusting steel tools when forming, machining or cutting, also for welding tools. As with other machining operations, always use a constant feed to avoid interruptions in the cutting process. Do not stop or slow down while cutting. Generally do not cut, should be completely cooled; coolant can be 5% sodium nitrate aqueous solution or 1/20 soluble oil emulsion aqueous solution. Before forging, the oxygen-rich layer on the surface of the raw rod should be turned with cement alloy tools. The cutting depth should be greater than the thickness of the oxygen-enriched layer. The cutting speed is 20-30m/min, the feed rate is 0.1-02mm/R, and the hole processing is fine, especially suitable for thin-walled titanium products. When drilling, the elements should be prevented from being burned and clamped and deformed.
2. Titanium alloy drilling
Titanium alloys are prone to elongated and curved fragments during drilling. At the same time, high drilling heat will cause excessive accumulation of debris or sticking to the edge of the hole, which is the main reason for the difficulty of drilling titanium alloys. Drilling should use a short and sharp drill bit, high-speed forced feed, and the bracket should be tightened repeatedly and fully cooled, especially for deep hole drilling. During the drilling process, the drill bit should remain in the drilling state in the hole, and idling in the hole is not allowed. Drilling speed should be kept low and constant. Carefully drill the holes. When drilling is about to begin, it is best to retract the drilling tools so they can be cleaned, drilled into the wellbore and cleared of cuttings. The forced feeding method can be used to obtain a smooth hole when the hole is finally broken.
3. Titanium alloy
Machining titanium alloys is probably the most difficult process. Titanium swarf removal is limited when drilling, and the severe wear tendency can lead to improper threading, which can lead to bit spasm or breakage. Titanium tends to dry out on the tap after drilling. Therefore, blind holes or too long holes should be avoided as far as possible to prevent the surface roughness of the internal thread from increasing or the phenomenon of cone fracture. At the same time, the processing methods such as grinding the trailing edge of the faucet should be continuously improved. Axial plate grooves are milled on sharp corners along the length of the tooth flanks. On the other hand, use faucets with oxidized, oxidized or stained surfaces to reduce seizure and wear.
4. Titanium alloy sawn timber
When sawing titanium, low surface speeds and continuous forced feed should be used. The test results show that the coarse-toothed high-speed steel saw blades with a pitch of 4.2 mm to 8.5 mm are suitable for sawing titanium alloys. If a titanium alloy band saw is used, the pitch of the saw blade is determined by the thickness of the workpiece. Generally 2.5 mm to 25.4 mm. The thicker the material , the larger the pitch. At the same time , the mandatory supply capacity and the required coolant must be maintained.
5. Titanium EDM
EDM of titanium alloys requires an operating clearance between the tool and the workpiece. The range of the gap is preferably 0.005mm. Smaller clearances are typically used for finishing operations that require a smooth surface, while larger clearances are used for roughing operations that require rapid metal removal. Copper and zinc are the best electrode materials.
