Rotating and rising, like a ribbon dancing, it turns into a raging flame at the top... The "flying" of the torch of the Beijing Winter Olympic Games has attracted wide attention since its debut. The reporter learned from Donghua University that the team of Professor Sun Yize from the school of machinery of Donghua University is the key manufacturing technology provider of the outer ribbon (shell) of the torch. For the "black technology" behind the torch, researchers use the three "high" of "high-tech materials", "high-tech equipment" and "high-end manufacturing". Walking into sun Yize's office, it was still a hot scene in the winter vacation. The Shanghai "education pioneer" team led by him once developed special life-saving and communication ropes and cables to help Jiaolong complete 5000 meter and 7000 meter deep diving tests. This time, he also tackled the weaving technology of the torch shell and successfully put on the carbon fiber "coat" for the torch. The researchers of Donghua University guide the three-dimensional three-dimensional weaving on site. The picture is from Donghua University In 2020, Shanghai Petrochemical, the overall bearer of the torch, found sun Yize, who had been deeply engaged in the field of automatic weaving equipment for many years, and threw him a difficult problem - presenting the artistic modeling of the "flying" torch outer streamer with high precision with carbon fiber composites. Sun Yize said that the shape of the outer ribbon of the torch is a high-dimensional curved surface, which is an extremely complex heterosexual structural part for engineering manufacturing. After repeated discussion and polishing with designers, the team finally completed the mathematical modeling of torch manufacturing with multi-dimensional surface fitting intelligent algorithm. "Flying" torch production scene. The picture is from Donghua University Modeling is only the first step. The torch shell is not the same thick up and down, and the curved surface is not the same thick, which can not be realized by traditional manufacturing technology. At this time, the three-dimensional high-precision spherical three-dimensional knitting machine for large-size special-shaped structural parts exclusively developed by Donghua University has become the "secret weapon" for "knitting" this special-shaped structural part. It is reported that there are 576 knitting spindles in it, with a maximum section of 500 × 500mm is the largest three-dimensional spherical three-dimensional knitting machine in the world. When the equipment is working, 576 high-speed moving spindles constantly change tracks and cross shuttle at high speed in the annular spherical track. "Just like on a four lane highway, hundreds or even thousands of vehicles cross and shuttle at high speed. We avoid 'traffic accidents' through intelligent calculation and accurate track change control." Sun Yize introduced. Three dimensional spherical three-dimensional knitting machine developed by researchers of Donghua University. The picture is from Donghua University In the production workshop, the three-dimensional spherical three-dimensional knitting machine with a diameter of 8 meters runs at high speed, in which hundreds of black tow cross shuttle, each containing 12000 carbon fiber filaments. It takes only a few minutes to "weave" a torch shell accurate to "grams", and then through the processes of radium carving, coloring and high-temperature paint spraying, all the manufacturing work of "flying" torch shell is completed. "Flying" torch production scene. The picture is from Donghua University It is understood that in order to make carbon fiber composites "obedient" in the "weaving" process and restore the soft and elegant feeling of ribbon shape in industrial production, the scientific research team invented the so-called "eccentric" weaving method to solve the problem of large curvature and variable density weaving; The original dual robot collaborative clamping core mold control algorithm ensures the best dynamic performance of the "weaving" of large-size special-shaped structural parts under complex stress state, and finally realizes the three-dimensional automatic "weaving" and automatic grinding of the flare shell, which not only fills the gap in China, but also takes the lead in the world. Sun Yize said that the team will continue to take scientific and technological innovation and solving the urgent needs of the country as its own responsibility, focus on the "neck" and short board problems in high-end weaving equipment, carry out basic theoretical research, break through key core technologies and promote industrial application. [News Agency]
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