Hot working properties and industrial application of TC4 titanium alloy

The pressure processing of titanium alloy is more similar to the processing of steel than the processing of non-ferrous metals and alloys. Many process parameters of titanium alloy during forging, volume stamping and plate stamping are close to those of steel processing. But there are also some important features that must be paid attention to when pressure working on Qin and Qin alloys.

Although it is generally believed that the hexagonal lattice contained in titanium and titanium alloys has low plasticity during deformation, various pressure processing methods used for other structural metals are also suitable for titanium alloys. The ratio of yield point to strength limit refers to one of the characteristic indexes of whether a metal can withstand plastic deformation. The larger the ratio, the worse the plasticity of the metal. For industrial pure titanium in a cooling state, the ratio is 0.72-0.87, while carbon steel is 0.6-0.65, and stainless steel is 0.4-0.5.

Perform volume stamping, free forging and other operations related to the processing of large cross-section and large-size blanks in the heated state (above the =yS transition temperature). The heating temperature range of forging and pressing is between 850-1150°C. Alloys BT; M) 0, BT1-0, OT4~0 and OT4-1 have satisfactory plastic deformation in the cooling state. Therefore, most of the parts made of these alloys are stamped from blanks that have undergone intermediate annealing without heating. When the titanium alloy is cold plastically deformed, regardless of its chemical composition and mechanical properties, the strength will be greatly improved, and the plasticity will be correspondingly reduced. For this reason, it is necessary to perform an annealing treatment between procedures.

The blade groove wear that occurs during titanium alloy processing is the local wear along the cutting depth direction of the back and the front, and it is often caused by the hardened layer left by the previous processing. The chemical reaction and diffusion of the tool and the workpiece material at a processing temperature of more than 800°C are also one of the reasons for the formation of groove wear. Because during the machining process, the titanium molecules of the workpiece accumulate in the front area of ​​the blade and are "welded" to the blade under high pressure and high temperature, forming a built-up edge. When the built-up edge is peeled from the blade, the carbide coating of the blade is taken away.

Due to the heat resistance of titanium, cooling is very important in the machining process. The purpose of cooling is to keep the blade and tool surface from overheating. Using end coolant, in this way, when performing square shoulder milling and face milling of dimples, cavities or full grooves, a good chip removal effect can be achieved. When cutting titanium metal, the chips are easy to stick to the cutting edge, causing the next round of milling cutter rotation to cut the chips again, which often causes the edge line to collapse. Each type of blade cavity has its own coolant hole/injection to solve this problem and strengthen the constant blade performance. Another clever solution is a threaded cooling hole. Long-edge milling cutters have many blades. Applying coolant to each hole requires a high pump capacity and pressure. However, it is different. It can block unnecessary holes according to needs, thereby maximizing the flow of liquid to the holes that need it.
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