序言我国机械工业在解放后的几年中,已有蓬勃发展,它已从解放前残缺不全和修配性质的半殖民地工业趋向有完整体系和正规生产的现代化工业。过去在生产中不仅没有工艺规程、典型工艺等成套的工艺文件,就是连生产用的产品图纸也常常残缺不全,或者根本没有。现在大部份旧厂经过改建或者技术改造,都已逐步推行了工艺规程,初步建立了工艺秩序;新建厂则吸收了国外全套工艺文件,奠定了文明生产的基础。 Preface In the few years after the liberation of China’s machinery industry, it has flourished. It has evolved from a semi-colonial industry with incompleteness and compatibility before liberation to a modern system with a complete system and regular production. In the past, in the production process, there were not only complete sets of process documents such as process specifications and typical processes, but even the drawings of products used in production were often incomplete or not at all. Now that most of the old plants have undergone reconstruction or technological transformation, they have gradually implemented process rules and established a preliminary process order. Newly built plants have absorbed a full set of foreign process documents and laid the foundation for civilized production.