The cladding rolling process will bring changes to the production of titanium alloy sheets

The production of domestic titanium alloy sheets is still mostly rolled by the single-piece method. Due to the poor low-temperature plasticity of titanium alloys and large cold deformation work hardening, it is extremely difficult to produce thin plates by the single-piece method. In order to make the rolling process go smoothly and reduce the temperature drop of the metal during the forging process, especially to reduce the chill on the surface of the billet, the die for forging titanium alloy needs to be preheated. Otherwise, the metal temperature drop and surface chill will make the metal not fill the mold groove well and may cause many cracks. Die preheating systems for titanium alloy forging are usually detachable, but sometimes a heating device mounted on the press is also used. Detachable die heating systems are usually gas heaters that slowly heat the die to the desired temperature range before the modules are assembled into the forging equipment. The heating device solidified on the press usually adopts induction heating or resistance heating. With the expansion of the market, the new technology of superplastic forming-diffusion joining of titanium alloy sheet has been widely used.

According to statistics, in the production of TC4 titanium plate, the invisible loss caused by alkaline pickling and grinding is as high as about 30%, the comprehensive yield is only about 35%, and the production cycle is long and the performance is unstable. The deformation rate of the cold rolling degree is not more than 25%, and it requires multiple cold rolling, intermediate annealing, and alkali pickling, and process defects such as cracks, edge cracks, slag removal, and cratering are prone to occur during rolling. Production process of titanium alloy plate (below 1.0mm), titanium alloy cross rolling and beta thermal process, self-developed stack rolling and clad rolling process, titanium and titanium alloy warm rolling technology, self-developed atmosphere protection controllable Cooling gravity creep correction technology and other key technologies for a series of flow rectification processes. In the test of the new production process of TC4 sheet, TC4 sheet with thickness of 0.6mm has been produced by cladding and rolling process, and it has been put into mass production.