In 1968, Chen Biguang brought the first edition of the group drill to Shanghai. I spent three days intensively reading and taking notes to record the problems to be raised. Promote classes. The class took off for 7 days, lectured in the morning, and practiced in the workshop in the afternoon. I took the drilling dynamometer I bought from Harbin Institute of Technology and compared the axial force and the rejection of the drill bits such as Ni Zhifu and Li Fuxiang. At the same time, I also tested the drill bits that everyone grinded to compare which one was the lightest. I remember that at the time, I trained 20 masonry masters such as Wang Maomao of Dalong Machinery Factory, and basically learned to sharpen the diamonds by hand. The development of Ni Zhifu's basic drill type can be seen in Figure 2. Based on the Type 67, the Beijing Group Drilling Group has studied cast iron drills, brass drills, copper drills, aluminum alloy drills, stainless steel drills, small hole drills, etc. after years of tests based on different materials, different structures and different process requirements. Fine hole drilling, blank reaming drills and other series of drills. When the first edition of "Group Drill" was finalized in Shanghai Science and Technology Press, Ni Zhifu and Chen Biguang lived in Shanghai for two months. I was transferred to the city council for two months, followed by Ni Zhifu and Chen Biguang, and reflected the problems and suggestions in Shanghai promotion. After the discussion of the manuscript was revised, we also arranged for Ni Zhifu to perform at the Minhang Motor Factory. There are too many people in the sharpening room. In order to reduce the tiredness of Master Ni, I remember that I was also roughing for him. Master Ni also repaired the masters who were left to see it. The performance was welcomed by many workers' masters. In the following decades, I have been invited to visit more than 20 units in Shanghai Jinchee Association and East China, to participate in technical research, performance, promotion, and lectures until retirement. Chen Guangguang and Liu Dechun, the masters of the group drill group of Beijing Yongding Machinery Factory, have long been tested and researched, summed up the experience of drill innovation at home and abroad, and have consistently achieved results. The group drill group wrote the first edition of "Practice and Cognition of Group Drilling" in 1968. In 1979, it wrote "New Collection of Group Drills". In 1982, it wrote the second edition of "Group Drills" until 1999, when Ni Zhifu and Chen Biguang After writing the third edition of "Group Drilling - Ni Zhifu Drill" and other monographs, it has drawn a successful conclusion for the invention and innovation of the group drill. Group drills made an indelible contribution to the development of the motherland's hole processing business and the transformation of the drill type into the international arena. In 1965, Ni Zhifu was awarded the National Science and Technology Invention Award. In 1986, he received the Gold Medal and Medal from the United Nations World Intellectual Property Organization. In December 2001, Ni Zhifu obtained the new utility patent (ZL01220344.0) issued by the State Intellectual Property Office. The innovation and development of the group drill series is firstly from practice. In the drilling process, it is continuously improved by sharpening, and then scientific experiments, theoretical analysis and research are carried out, and the crystallization of the wisdom of the masses is gathered. The promotion of group drills has trained a large number of masters who master the group of grinding and sharpening technology, and made great contributions to solving drilling problems, improving drilling quality and efficiency, and creating more social benefits. The main drill types we promoted are Type 64, Type 67, fine hole drills, blank reaming drills, half hole drills, brass drills, aluminum alloy drills and stainless steel drills. Mr. Xiao Dayi, Sichuan Ziyang Yihua Industrial Technology Co., Ltd. developed a universal tool grinding machine with group grinding and sharpening function in 1990. In 1996, he successfully developed a group of drill tip sharpening machines to replace manual sharpening and improve the group of cutting edges. Grinding accuracy. The realization of group grinding mechanical sharpening is the only way to promote the industrialization of group drilling. At the beginning of the 21st century, Mr. Zhou Anshan, the general manager of Hainan Gaochao Drill Co., Ltd., developed his own group of sharpening and sharpening equipment to form the ability to drill a large number of sharpening drills. In 2001, Hainan Gaochao Bit Company organized a domestic expert to make an assessment and applied for funding from the National Science and Technology Commission “Coated Group Drillâ€. Zhou Anshan's paper "Standardization and Industrialization of Multi-Edged Twist Drills" won the award of outstanding papers by China Machinery Industry Metal Cutting Tool Technology Association. The sharpening of the drills of Gaochao Drill Co., Ltd. has gradually been pushed to the domestic and foreign markets. Previous Next stainless steel, sink strainer,fruit vegetable washing drain basket,kitchen tool,draining rack, draining basket. 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Figure 2 Development of Ni Zhifu's basic drill type