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库兹巴斯各矿井在煤层中钻眼每年消耗50万个PM型钻头。 多年实践表明,手持电钻用PM型钻头在煤层中钻眼不适应现代要求,钻速很低、钻头硬质合金片很快磨钝,劳动量大而且产生大量粉尘。 鉴于存在着上述的缺点,库兹涅茨克机器制造厂在PM型钻头的基础上研制PY—43型煤钻头,适用于在软及中硬煤层上用手持电钻钻眼。 PY—43型钻头(见图)与PM—43型钻头的区别是具有组合形状,钻头底部宽16毫
Each of Kuzbass mines drills 500,000 PM-type drill bits per year in the coal seam. Years of practice have shown that PM drills with drills do not adapt to the modern requirements of drilling in the coal seam. Drill speeds are very low, and drill bit cemented carbide sheets blunter quickly, with large labor and large amounts of dust. Given these shortcomings, the Kuznetsk Machine Works developed the PY-43 briquette drill bit on the basis of the PM drill bit, which is suitable for drilling eyes with hand-held electric drills on soft and medium-hard seams. The difference between the PY-43 drill bit (see picture) and the PM-43 drill bit is that it has a combined shape and the bottom of the drill bit is 16 millimeters wide