一、序言: 在毛主席的无产阶级革命路线指引下,武汉重型机床厂的广大工人、干部和技术人员,遵循伟大领袖毛主席“以钢为纲”“独立自主,自力更生”和“大打矿山之仗”的教导,高举“鞍钢宪法”走三结合的道路,为加速我国矿山机械、重型机械、重型机床和造船工业的发展,作出应有的贡献。于一九七○年五月开始着手设计5米×20米龙门刨铣联合机床(图1),并在兄弟单位的大力协助下,经过一年多的奋战,克服了种种的困难, I. Preamble: Under Chairman Mao’s proletarian revolutionary line, the vast majority of workers, cadres and technicians in Wuhan Heavy Machine Tool Plant follow the example of Chairman Mao of the great leader “taking steel as the key link,” “being independent and self-reliance,” and “ War ”, hold high the“ Anshan Iron and Steel Constitution ”take the road of the third combination, to speed up the development of China’s mining machinery, heavy machinery, heavy machine tools and shipbuilding industry, make its due contribution. In May 1970, we started to design a 5mx 20m gantry milling machine (Figure 1). With the great help of our brother units, after over a year’s hard work, we have overcome all kinds of difficulties,