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河南省机械电子厅于1983年11月下旬在洛阳对φ51毫米四齿、五齿、六齿三种波形螺纹连接冷压球齿钎头进行了技术鉴定,出席会议的有中国科学院以及机械、冶金、地质、铁道、水电等部门的工人、教授、高级工程师等工程技术人员共21个单位29人。φ51毫米冷压球齿钎头是以云阳钢厂陈国友为主,结合洛阳工学院贠自均、李延祥和洛阳兴隆机械厂研制成功的。主要用于隧道掘进和中深孔凿岩,从80年4月开始,先后研制了十二批钎头,经在河南杨树沟矿、李珍铁矿、武钢大冶铁矿、酒钢镜铁山矿、铁道部大瑶山隧道工程等处凿岩试验,效果显著。钎头平均寿命超过200米,比原矿用钎头平均寿命提高2～3倍,深受用户欢迎。
Machinery and Electronics Department of Henan Province in late November 1983 in Luoyang φ51 mm four teeth, five teeth, six teeth of the three wave-shaped thread connection cold-pressure ball tooth bit for technical identification, attended the meeting with the Chinese Academy of Sciences and machinery, metallurgy , Geology, railway, hydropower and other departments of workers, professors, senior engineers and other engineering and technical personnel a total of 21 units 29 people. φ51 mm cold-pressure ball tooth bit head Yun-Gang Chen Yun-based steel company, combined with Luoyang Institute 贠 from the average, Li Yanxiang and Luoyang Xinglong Machinery Factory successfully developed. Mainly used for tunnel boring and drilling in the deep hole, from April 80 onwards, has developed a batch of 12 heads, after Yangshugou mine in Henan Province, Li Zhen Iron Mine, WISDAYE iron ore, Jiuquan Iron Tieshan Mine, Ministry of Railways Dayaoshan tunnel engineering drill drilling, the effect is significant. Drill bit average life expectancy of more than 200 meters, the average life expectancy than the original drill bit increased by 2 to 3 times, by the user.