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本文系作者在美国学习考察时的见闻,供钻头制造及研究同行参考。(一)休斯(Hnghes)工具公司休斯敦总厂职工约3000人,生产各类型200多种规格钻头15～18万只,另外还生产工具接头10多万对。休斯钻头在美国的总平均进尺,1961年为119米/只,1970午为215米/只。由于70年代大力发展密封滑动轴承镶齿喷射式钻头(J 系列钻头),1977年平均总进尺已跃增为395米/只。休斯 J 系列钻头平均使用寿命80～120小时/
This article is the author of the study learned in the United States learned for bit manufacturing and research colleagues reference. (A) Hughes (Hnghes) Tool Company Houston plant employees about 3,000 people, the production of various types of more than 200 kinds of specifications drill 150,000 to 180,000, in addition to the production of tools more than 100,000 pairs of joints. Hughes bit in the United States the average footage, 1961 to 119 meters / only in 1970 to 215 meters / only. Since the 1970s, the development of sealed sliding bearing insert jet drill (J Series drill) has been greatly enhanced. In 1977, the average total footage has been jumped to 395 m / piece. Hughes J series drill bit average life of 80 to 120 hours /