June 1st to 7th, developed by Baoji Titanium group of 4500 meters manned submersible for TC4 titanium alloy manned spherical shell, participated in the theme "innovation driven development, science and technology leading the future" country "1025" scientific and technological innovation achievements exhibition, General Secretary Xi Jinping, Li Keqiang, the prime minister etc. party and state leaders visited the exhibition, developed by Baoji Titanium Submersible titanium alloy manned spherical shell fully affirmed the, and the ardent hope. State leaders to the booth to visit and to enterprise's encouragement, let nonferrous metal industry, titanium industry, especially BaoTi group into wild excitement, very proud, is a great inspiration of Baoji Titanium Industry Science and technology innovation and the development of China titanium industry.
Xi Jinping, general secretary of the national science and Technology Innovation Conference, pointed out: "science and technology is the weapon of the country, the country depends on the strong, enterprises rely on to win, people live to be good." Baoji Titanium group bear of key projects of major national issues, efforts to carry out scientific and technological innovation, technology research and new materials development, for the effort to build a submersible titanium alloy manned spherical shell the cutting-edge technology products, the weapon, made due contribution.
Technology innovation to seize the commanding heights of Technology
"4500 meters deep diving submersible TC4 titanium alloy manned spherical shell" project is to meet the need of our country's deep-sea detection in the field of manned submersible localization of key parts, by the Ministry of science and technology of China "863" major projects supporting the sub topic of the key task in the development of the 4500 meters deep manned submersible design and key technology research ". The project development is of great significance, localization of key components of the manned submersible can not only get rid of our country in the field of Russia and other developed countries dependence and can also achieve the resources in the field of deep-sea exploration and development and utilization, so as to improve China's high-end equipment manufacturing level, and enhance the country's comprehensive strength.
Project in 2012, the project was approved in 2015, completed in 2013. The design of manned cabin designed by CSIC 702nd, BaoTi group is responsible for the development of. In the production process, BaoTi led, combined with the AVIC the 625, Harbin Industrial University, Pashtoon mold, CCID heavy, treasure color equipment a national first-class enterprise, University, research, lift force in the country completed the manned cabin development tasks.
Manned capsule shell is the most important component of the submersible, its design and production quality is an important guarantee for the performance and safety of the crew. Titanium alloy not only has high specific strength, in seawater ability local and uniform corrosion is excellent material for the production of deep-sea pressure sphere. Therefore, the design and manufacture of titanium alloy pressure manned sphere is the key research content of the development of the submersible.
At present, in the world several maritime power in manned ball making method different, mainly to Japan, the United States, France and other developed countries as typical hemisphere whole punching, and in Russia on behalf of the melon petal spell two methods of forming and welding. From safety and improve manned spherical structure benefit point of view, the manned spherical shell in the deep sea to sea water under great pressure, the reliability of the weld zone is lower than base metal. Therefore, quality evaluation, improve the overall performance of the spherical shell and reduce weld, to ensure the submersible safety and reliability has important significance.
In the design concept, BaoTi group after a lot of argument, has put forward a bold hemisphere is integrated molding and electron beam welding technology scheme, using two titanium alloy hemisphere folded into, in processing, manufacturing, welding technology in today's world of advanced technology is adopted in many aspects, significantly improve the safety and reliability of the manned spherical shell, beyond the dragon of Russian melon petals spell welding molding manned spherical shell.
The pressure hull of the titanium alloy is one of the key technologies for the development of the manned submersible in China. Company through science and technology innovation, breakthrough manned capsule ball shell manufacturing key technology bottlenecks, has mastered the wide titanium alloy plate development, development of Ti alloy hemispherical integral forming technology research, titanium alloy welding wire, narrow gap welding process research and spherical tank manufacture, electron beam welding craft research, sphere deformation and annealing process, such as a number of independent intellectual property core technology, promoted China's manned diving engineering technical strength to a higher level, so as to lay a foundation for the development of subsequent deep submersible.
In the course of the development of spherical shell, project leader, Baoji, general manager of the shares Jia Shuanxiao, deputy general manager Wei Qi Wang and other leading cadres play a key role. Their scientific decision-making, creatively, boldly put forward hemisphere whole molding and electron beam welding technology of leading international technical scheme, by the national Ministry of science and technology and recognized experts, the company for the success of the manned spherical shell project and extra for the Ministry of science and technology for the company project alone 500 million yuan of funds of electron beam welding project.
The project formed the development team within the company, to Party members and cadres as the core, play overall superiority of Baoji Titanium Group, project development cooperation, set the domestic welding, machining and forming the industry equipment, technology advantages, to achieve the GI corps "battle. Actively seek support from the Ministry of science and technology, the overall design of the project, the project team of experts, to promote the development of the project and key difficulties. Jia Shuanxiao and other leading cadres to lead the project team, innovation experiment, in the project development of the key nodes, to ensure that the project development tasks and schedule, at the scene spent many sleepless nights.
In the development of the project team, group deputy leader Wang Weiqi in the line, study the key technology breakthrough; senior engineer Zhang Yongqiang wholeheartedly to coordinate projects and external liaison work; Deputy Manager of plate company, senior engineer Pang Hong Rong Yao in the technology and quality control of plate rolling, "squatting" in the field, strictly sure, no mistakes; senior engineer Wang Jianhong, Yuan Xiaogang in the later processing of spherical shell welding this key step, to mingle with technicians, strictly control the process, the welding process is not a wire fault; Wang Yongmei professor of Engineering in project management, testing and other aspects of positive and external experts, coordination unit. Company casting factory, forging factory, plate with factory and company heavy plate, wire rod mill, the treasure color of special equipment, such as active collaboration, do their own process of development. The wisdom of the people, the power of the team, so that the development of the project can be carried out smoothly.
In the Jia Shuanxiao team, after years of research, 2015 to complete the development work of BaoTi manned spherical shell. Developed titanium alloy manned spherical shell, a single weight of more than 4 tons, the wall thickness of 53 mm, the diameter of 2.1 meters, is the largest of all titanium alloy components. After the examination, two spherical shell the performance indicators have reached the design requirements, the ball really control at 1 mm (design requirements 4 mm), in sphericity, residual stress and ahead of the competition, finally the expert review the most technologically advanced electron beam spherical shell was rated the best.
The project successfully developed to fill the many technical gaps in the field of China's titanium and titanium alloy large equipment manufacturing, marking the passive situation of China's deep-sea manned submersible tank manufacturing technology into the advanced ranks in the military, a manned capsule shell over dependence on imports, also to enhance China's titanium alloy and other new materials research, advanced equipment manufacturing technology, marine development and progress in the field has important significance to promote for subsequent BaoTi group sea deep manned submersible device, deep space station, a new generation of ships and other key national and major project to create a good foundation and conditions.
Carry forward the spirit of craftsmen to make quality products
Premier Li Keqiang in 2016, "the government work report" in the first mention of "the spirit of the craftsman", put forward to cultivate and promote the spirit of the spirit of excellence, and guide enterprises to establish quality first, reputation first business philosophy. BaoTi technology workers in the process of developing submersible manned spherical shell, to comply with this philosophy, carry forward the spirit of artisans, excellence, meticulous, patience, perseverance and dedication.
Vacuum melting professional national senior technician, Shaanxi Province Chief technologist, national technical experts, current BaoTi Group Casting Factory smelting workshop Party branch secretary Wang Yan He is the practice of "craftsman spirit". In order to cast out high-quality titanium alloy ingot to requirements of the development of titanium alloy spherical shell, Wang Yan he received the task of casting, the first call with monitor the task decomposition, from the examination of an electrode, crucibles, furnace chamber, an electrode rod and auxiliary electrode cleaning, equipment running state, ingot cleanup to finished the, every step of the matters needing attention, tooling are specific analysis and arrangement, to ensure that the production process control to meet the process requirements. Wang Yanhe led the team comrades are not afraid of dirty, not afraid of tired, adhere to the highest standards of cleaning production, to ensure that each furnace crucible, furnace room, electrode and auxiliary electrodes are exposed to reveal all parts of the material qualities. In process control, Wang Yan he strictly supervise the operators to earnestly implement the procedure, in order to ensure the oxygen content of the standards, to strictly control the degree of vacuum, leakage rate and cooling time of three parameters, so as to ensure the ingot oxygen content and quality to meet the subsequent production of need.
In the project development for several years, the project team developed ten years of grinding sword hard-working spirit, build quality excellence. Their side of the innovative side of the test, the process of several times to adjust and improve the program. Taking the narrow gap welding as an example, the composition adjustment and test of nearly one hundred times of the alloy are carried out only by welding the welding wire, and the welding quality and performance are ensured to be equal to the base metal.
Spherical shell welding is difficult, the most critical and the most hard working procedure. Ball closure weld at 7 meters above the equator, coupled with the observation window seam, weld whole spherical shell is more than 30 meters. More importantly, every point of closure need welding number 10 layers, each layer needs more than 2 welding. Some people count over an account, the ball shell welding process, the actual need to weld more than 1000 meters, and the process of welding in the pass rate must be fully achieved 100%, a little flaw, it will make the entire ball shell scrapped. Of arc light radiation to skin and eyes caused great harm, burns the skin, be off a layer of skin; burn the eyes, like that is got pinkeye, unbearable pain, eyes open, tears kept flow. Sometimes welding workers to work in the shell, welding inside the sphere can not ventilate and temperatures as high as 50 DEG C, several welder turns and welding protection, working 12 hours a day or more, work very hard, but no a person called crying tired or out development work. Jinzhu Wang master welder who after numerous welding test and analysis, of welding current, voltage, welding speed, interlayer temperature parameters by orthogonal experimental method of welding test and the test data were analysis and comparison, and ultimately determine the optimal welding parameters and process, and through the process of classification society recognized. In order to meet the precision of assembly and prevent the deformation of welding process, they made the spherical shell assembly positioning tool and the welding deformation of the fixture. After repeated test, after nearly a month of time, welding group the successful completion of the spherical shell welding tasks, with subsequent detection, manned spherical shell weld nondestructive detection, mechanical properties, sphericity and so on key indicators meet design requirements, and through the factory inspection.
Development of submersible of Titanium manned spherical shell, BaoTi group to enhance the ability of China's scientific and technological innovation, promote the titanium industry development and marine development and progress in the field of made due contributions, BaoTi group of cadres and workers are determined to Xi, general secretary of the party and state leaders encouraged and expectations in mind, bearing in mind the mission, guard against arrogance and impetuosity, enthusiastic, always put scientific and technological innovation as enterprise development driving force, for national innovation driven development and make greater contribution.

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