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用普通麻花钻头钻削650型架子车的条帽孔,遇到许多问题。条帽材料为45冷拉钢,孔径3.9毫米,孔长15毫米。大量生产时,手动进刀,钻头分屑不好,排屑困难,极易堵塞,经常折断钻头。长期存在着钻头消耗量大和生产效率低的问题。静宁县农机厂工人在长期实践中摸索出一种不等偏角小型强力钻头的新钻型,在转数n=1400转/分,快速手动进刀(走刀量达0.3～0.5毫米/转)的切削条件下,不到两秒钟即可钻通一个条帽孔,生产效率提高5倍以上,
With ordinary twist drill drilling 650 rack car hat hole, encountered many problems. The material of the cap is 45 cold drawn steel, with a hole diameter of 3.9 mm and a hole length of 15 mm. Mass production, the manual feed, bit bad chip, chip difficult, easily blocked, often broken drill. There is a long-term problem of high bit consumption and low productivity. Jingning County Farm Machinery Factory workers in the long-term practice to find out a large range of different angle of the new drill bit strong drill, the number of revolutions n = 1400 rev / min, rapid manual feed (take the amount of 0.3 to 0.5 mm / rev ) Of the cutting conditions, less than two seconds to drill through a hat hole, production efficiency increased by 5 times or more,