Pressing hydroforming technology to solve the problem of wrinkling and cracking of aviation sheet metal parts
Release time：2018-06-20 09:49
Science and Technology Daily, Shenyang, June 8 (Reporter Hao Xiaoming) in aerospace equipment, sheet metal parts account for more than 20% of the total number of parts and manufacturing workload, while sheet metal parts of light alloys such as high-strength aluminum, magnesium and titanium are easy to wrinkle and crack in the manufacturing process due to their poor plasticity, which has been perplexing the development level of lightweight and integration of sheet metal parts in China's aviation field.
"This technology can change the manual auxiliary manufacturing process of more than 8 passes in the traditional aluminum alloy sheet forming process into an automatic production process of 2 passes, without intermediate process heat treatment, which improves the production efficiency by 4 times compared with the past, and is expected to promote and enhance the development level of China's aviation sheet metal manufacturing industry." Researcher Zhang Shihong, head of the research group of advanced plastic processing technology of the Institute of Metals of the Chinese Academy of Sciences, said that before this, China had been following the drop hammer forming technology of the former Soviet Union, which needed to be combined with manual pressing through molds. However, the formed parts had defects such as scratches on the surface, low yield, poor precision and consistency of parts, etc.
"In particular, the manufacture of complex special-shaped thin-walled sheet metal parts of aluminum, magnesium and titanium lightweight alloys with small characteristic structures such as bosses, reinforcing ribs and small rounded corners has become an important problem to be solved urgently to promote the level improvement of large aircraft." Zhang Shihong said.
In the research and development, the project team formed a new impact hydroforming technology by combining the liquid-filled deep drawing technology with the high-speed impact forming technology, and designed a plate impact hydroforming limit test device accordingly. Through a large number of experiments, they have proved that this technology and device are also suitable for the forming and preparation of aluminum alloy, aluminum lithium alloy, magnesium alloy, titanium alloy and other materials.
Based on this, the research group independently developed this new principle of impact hydroforming special equipment. It is reported that the equipment uses a hydraulic accumulator combination structure, which can realize the high-energy and high-speed drive and control of the large-mass impact body, which is also the core patented technology of the equipment.
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