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兰州石油化工机器厂二分厂每年换热器的生产量很大,换热器所用的螺帽需要量就更大了,每月需M24～M27的螺帽两万余个。过去对螺帽的生产所采用的工序是:锻六方棒毛坯→铣六方→车床切断倒角→六角车床钻孔→倒角→攻丝。此工序不仅占用了大量的精密机床,而且生产效率很低,对机床精度影响也大。为改变这种落后的生产状况。该分厂小型工段的广大革命职工在“鞍钢宪法”的指引下,
Lanzhou Petrochemical Machinery Plant, the second branch of the annual heat exchanger production is large, the nut used in heat exchangers greater demand, the monthly M24 ~ M27 need more than 20,000 nuts. In the past on the nut production processes used are: forging six bar rough → milling six square → lathe cutting chamfering → hexagonal lathe drilling → chamfering → tapping. This process not only takes up a large number of precision machine tools, and production efficiency is very low, the impact on machine accuracy is also large. To change this backward production conditions. Under the guidance of the “Anshan Iron and Steel Constitution,” the vast majority of revolutionary workers in the small section of the factory,