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在毛主席革命路线的指引下,在无产阶级文化大革命的鼓舞和推动下,我国组合机床的生产和技术得到了迅速的发展。以华主席为首的党中央一举粉碎了“四人帮”,国内和国际形势一派大好,当前,农业学大寨,工业学大庆的群众运动正在全国蓬勃展开。随着机械工业的迅猛发展,我国组合机床必将有很大的发展,如今拥有量正在逐年增长,通用部件的品种不断增加,技术水平也有较大的提高。在这种新的形势下,为了多快好省地发展组合机床,有必要制订出全国性的组合机床通用部件系列标准,来协调和统一全国组合机床通用部件的系列参数和互换尺寸,以便以最少的品种和规格来满足最大的需要。第一机械工业部曾于一九七五年三月二十一日以(75)一机院字第380号文件颁发了组合机床精度及通用部件等十五项部标准(即JB1521—75至JB1535—75)这十五项部标准本刊已在1975年第4期上作了介绍
Under the guidance of Chairman Mao’s revolutionary line and with the encouragement and promotion of the Great Proletarian Cultural Revolution, the production and technology of composite machine tools in our country has been rapidly developed. The Central Committee of the Party led by Chairman Hua smashed the “gang of four” in one fell swoop, and the domestic and international situation was fantastic. At present, the mass movement of learning Dazhai in Agriculture and Daqing in Industrial Science is booming nationwide. With the rapid development of machinery industry, China’s combination of machine tools is bound to have a great development, and now the amount of possession is increasing year by year, the common parts of the species is increasing, the technical level has also been greatly improved. Under such a new situation, in order to develop a combination machine tool more quickly and economically, it is necessary to formulate a series of national standards for a universal machine tool assembly to coordinate and unify the series of parameters and interchange sizes of the common components of the national combination machine so that With the smallest varieties and specifications to meet the greatest needs. Ministry of Machinery Industry (MIIT) issued a standard of 15 departmental standards such as machine tool precision and common parts (ie JB1521-75 to March 31, 1975) JB1535-75) The fifteen ministries and standards have been published in the fourth issue in 1975 was introduced