| Citation: | LI X Q，ZHANG H G，WANG S，et al. Development and experimental of friction tester for aluminum alloy sheet stamping[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（6）：1898-1910 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0542
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The overall design concept of the servo pressure and friction test platform for aluminum alloy sheets under heating circumstances was designed with the aim of meeting the need for friction testing of aluminum alloy sheet stamping. A small-load high-precision multi-functional friction testing machine system suitable for aluminum alloy sheet forming was developed. The system consists of a mechanical system, a heating system and a control system. The mechanical system realizes the movement support of the upper tool and chuck. The heating system realizes the separate heating of tools and specimens. In the servo control mode, combined with the external force sensor and the grating ruler, the force and displacement control double closed loop system is realized, which realizes the high precision and stability control of the specimen pressure and the tool gap. Finally, the orthogonal experiment was designed to explore the influence of different factors on the friction of aluminum alloy blank. The results show that the friction tester has stable performance and good repeatability. The important order of factors affecting friction coefficient is tool temperature, pressure, speed, and lubricant. The lower the temperature, the greater the pressure, the faster the speed, and the smaller the friction coefficient. The same type of lubricant has less influence on the coefficient of friction. The tendency of the coefficient of friction decreasing decreases with increasing pressure and eventually becomes more steady.
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