In the manufacturing field, the precision is a difficult point. The breakthrough of the grade 1 precision of the superprecision gear in our country can be served as the typical example for its illustration. The ultra-precision gear for achieving transmission, speed change and direction change can be used as the transmission benchmark for the gear precision, and can also be used as a precision instrument to be installed in cutting-edge products and modern weapons. Due to the restriction of the technology transfer to our country by Western developed countries, Wang Liding, academician of the Chinese Academy of Sciences, with his team have successfully developed the grade 1 ultra-precision standard gear in the international standard in 1999 and mastered the core technology independently. Based on the interview with Wang Liding, this paper analyzes the evolution process of the super-precision gear from grade 4 to grade 2, and then to grade 1, to enrich the historical data of the development of the ultra-precision gear technology in China and to show the innovative spirit of the older generation of scientists in China.

ultra-precision gear technology  /  Wang Liding  /  standard gear