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目前,在我国金属矿山使用的牙轮钻头仅有 KY-250型和 KJY-250型两种,分别适于穿凿坚硬、极坚硬矿岩,而对于中硬和中硬以下的矿岩,尚没有一种适用钻头。据调查,仅鞍钢矿山公司使用牙轮钻机的五个铁矿,中硬岩层(f=6～12)约占剥岩总量的50%以上,数量大,分布范围广。为了提高钻凿速度,延长钻头使用寿命和降低穿爆成本,我们在1980年下半年开始设计适于穿凿中硬岩层的钻头。1981年起分三批研制、试验,于1982年12月通过鉴定。
At present, the roller cone bits used in metal mines in our country are only two types of KY-250 and KJY-250, which are suitable for wearing hard and extremely hard ore rock respectively, but not for moderate and medium hard ore rock A suitable drill. According to the survey, only the five iron mines using the roller cone rig of Ansteel Minerals Co., Ltd. are medium-hard rock formations (f = 6 ~ 12) accounting for more than 50% of the total amount of stripping rocks, with a large number and a wide distribution. In order to increase the drilling speed, extend the service life of the drill and reduce the cost of drilling, we started to design drill bits suitable for drilling medium and hard rock formations in the second half of 1980. Since 1981, three batches of research and test, passed the appraisal in December 1982.