前言我厂生产的跃进牌汽车上的万向节十字轴和汽门挺杆等零件,热处理渗碳后需用铁丝一只只捆扎(十字轴)或装夹具(汽门挺杆),经预热后,再在盐浴内加热淬火。这样,不仅浪费人力物力,而且在盐浴炉中加热劳动强度也很大。为了解决这一问题,车间领导发动群众讨论,决定制造一台振底炉。由老工人、技术人员和车间领导组成三结合技术改 Foreword The universal joint cross shaft, valve lifter and other parts of the Yuejin automobile produced by our factory must be bundled only after the heat treatment and carburization (cross shaft) or fixture (valve lifter). After the heat, it is heated and quenched in a salt bath. In this way, not only waste of manpower and resources, but also in the salt bath furnace heating labor intensity. In order to solve this problem, the workshop leaders mobilized the masses to discuss and decided to make a hearth furnace. Three-in-one combination of technological change by old workers, technicians and workshop leaders