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1968年大庙铁矿采用了高效率的凿岩台车和重型导轨式凿岩机。1970年以前所用的钎具主要依靠国外进口。以后,广大职工奋发图强,开始自制了35SiMnMoVA和40Cr的钎尾,但其平均寿命在一百米以下,远远不能满足大打矿山之仗的急需,以致钎尾质量成了矿山生产的关键问题之一。为了解决这一问题,1971年在矿党委领导下,成立了有工人、干部、技术人员和北京钢铁学院教师参加的三结合钎尾质量攻关小组。对钎尾的热处理进行了试验研究,反复实践,终于
In 1968, the Daming Iron Mine used highly efficient rock drilling rigs and heavy rail rock drills. Before the year of solder used mainly by foreign imports. Since then, the majority of workers worked hard to start self-made 35SiMnMoVA and 40Cr shank, but its average life expectancy below 100 meters, far from being able to meet the urgent need to hit the battle of the mine, so that the quality of the drill tip has become a key issue of mine production one. In order to solve this problem, under the leadership of the coal mine party committee in 1971, a three-armed quality caucuses team with workers, cadres, technicians and teachers from Beijing Institute of Iron and Steel was established. The brazing tail heat treatment conducted a pilot study, repeated practice, and finally