2021 Q4 Machinery Technology Frontier Express
2021-12-12
1. The world`s most powerful integral solid rocket engine was successfully tested in Xi`an
On the morning of October 19, the ground thermal test run of the integral solid rocket motor with the largest thrust in the world, independently developed by the Fourth Academy of China Aerospace Science and Technology Corporation, achieved a complete success in Xi'an.
The engine has a diameter of 3.5 meters and a thrust of 500 tons. It adopts a high-performance fiber composite material shell, a high-loading integrally cast-formed combustion chamber, and a large-size nozzle. The comprehensive performance of the engine has reached the world's leading level. The success of the test marks a substantial increase in my country's solid carrying capacity, provides more power options for the development of my country's launch vehicle type spectrum, and is of great significance to the promotion of the development of large and heavy launch vehicle technology in the future.
2. The world's first grade 19.8 ultra-high-strength fastener was successfully developed
On November 28, the high-performance steel materials team led by Professor Dong Han from the School of Materials Science and Engineering of Shanghai University, Hebei Longfengshan Casting Co., Ltd., Qifeng Precision Technology Co., Ltd., Zhoushan 7412 Factory, Jiangsu Institute of Metallurgical Technology, Shanghai University (Zhejiang) High-end Equipment Basic Parts and Materials Research Institute, Shangda New Materials (Taizhou) Research Institute and other seven units after more than a year of joint research, developed the world's first 19.8-level ultra-high-strength fasteners, becoming the world's highest strength Grade fasteners. Public information shows that the highest strength level of fasteners of current superior companies in foreign countries has reached 17.8. According to the international development status of my country's 973 project, fastener materials and fasteners of grade 13.9-15.9 have been developed.
Through the optimization of materials and heat treatment process, the room temperature tensile strength of grade 16.8 and 19.8 bolts meets 1600~1770MPa and 1900~2070MPa, respectively. Shear test (according to GJB 3376-1998) results show that the shear force of grade 16.8 and 19.8 bolts reaches 97KN and 115KN respectively; tensile fatigue strength test at room temperature (according to GJB 3376-1998 and GJB715.30A-2002, load ratio = 0.1) The results show that the developed fasteners meet the fatigue life requirements (average fatigue life is not less than 65,000 times, and individual fatigue life is not less than 45,000 times); delayed fracture resistance test (according to GJB 715.12-1990, constant under atmospheric environment Tensile stress was maintained for 96 hours). The results showed that the bolt did not break during the test time, and no cracks were found on the surface and thread of the bolt after unloading; the comprehensive performance of the newly developed ultra-high-strength bolt satisfies the service requirements.
3. China's first 100 kilowatt ultra-high power laser was officially launched
On December 10, China's first 100-kilowatt ultra-high power laser was officially launched in Hengyang, Hunan. The laser was jointly developed by Nanhua University and Raycus Laser and other units. It is currently the largest power industrial fiber laser in China and the second largest power industrial laser in the world.
The laser uses a high-power single-mode fiber laser as a unit module, optimizes the layout design of the whole machine, develops a complete system integration and modular assembly technology, uses homemade high-power industrial-grade laser beam combiner and transmission components, and combines power, Multi-parameter real-time monitoring technology such as temperature, developed a multi-mode 100 kilowatt fiber laser.
