The traditional process of titanium bar is to cast spongy titanium into ingot, and then produce the bar by forging and rolling. Spongy titanium is the most primitive material for producing titanium. When it is smelted, the initial material for titanium processing — titanium ingot will be obtained.
The processing process of titanium bar from spongy titanium to blank is as follows:
(1) Pressing electrode, pressing titanium sponge through a press to form a dense titanium sponge pressing block electrode;
(2) Vacuum melting, at 1700 ~ 1800℃ and -103pa, three times of vacuum melting were performed on the titanium sponge pressing block electrode;
(3) To open the billet. Under the condition of 1000℃, the billet is opened by oil press and finally pressed into a square billet;
It should be noted that the life of the titanium bar is reduced due to the high pressure when the blank is opened. Therefore, when the titanium bar is die forged by the closed die forging method, the volume of the original blank must be strictly limited by the closed die forging method, which complicates the preparation process. Whether to use closed die forging, from the interest and technological feasibility of two aspects. Open die forging, the burrs of blank weight loss of 15% to 20% of the clamping part manufacturability waste (if the forging conditions must leave this part) accounted for 10% of the weight of the blank flash metal relative loss is usually increases with blank weight reduction, some asymmetric structure, area difference is bigger, and there are difficult to fill local forgings, burrs consumption as much as 50% for closed die forging are no burrs losses, but the blocking process is complex, you need to add more transitional type slot, will no doubt increase the ancillary expenses.
Then only thermal treatment and cutting of the final blank. The forging temperature and deformation degree are the basic factors that determine the microstructure and properties of the alloy. Titanium bar heat treatment is different from steel heat treatment, die forging is usually used to make shape and size close to the waste. It does not determine the structure of the alloy. Therefore, the process specification of the final work step of titanium bar is of special importance. It is necessary to make the overall deformation of the blank not less than 30% of the deformation temperature does not exceed the phase transition temperature, in order to make the titanium bar at the same time to obtain higher strength and plasticity, and should strive for the temperature and deformation degree in the whole deformation of the blank as far as possible uniform distribution.
(4) The first rolling, at 970 ~ 980℃, the preliminary rolling mill into cylindrical shape blank;
(5) Second rolling, at the condition of 950℃, rolling mill into blank parts.
There are many rolling methods, which can be classified according to different characteristics. According to the characteristics of metal flow and deformation, there are forward extrusion, reverse extrusion and special extrusion. Special extrusion includes hydrostatic extrusion, continuous extrusion, lateral extrusion, combined extrusion, compound extrusion, sheath extrusion, peeling extrusion, water seal extrusion, bitter mold extrusion, powder extrusion, semi-molten extrusion, liquid extrusion, etc. Extrusion is classified by temperature, including hot extrusion, warm extrusion and cold extrusion. Hot extrusion and cold extrusion are two main branches of extrusion, and they are mainly used in metallurgical industry system. Application of cold extrusion in mechanical industry system; The development of warm extrusion is relatively late and the application scope is also small.
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