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外摩擦片是我厂五吨液压传动叉车齿轮箱的主要零件之一,材料为65Mn钢,(M=4,Z=45);要求硬度为HRC44～49,蝶形度为0.25～0.55(见图1)。其中蝶形度的优劣直接影响叉车的正常使用,蝶形度小于0.25,则工作时摩擦片脱不开,大于0.55,则使齿轮箱内油温升高而被迫停止工作。我们原来用常规工艺处理,蝶形度达不到技术要求,后来受到“固溶—脱溶的变化过程中可能产生动态超塑性现象”[1,2]的启发,改进了回火工艺,取得了满意的效果。1.原工艺过程及结果①淬火工件在RJX—30型炉中加热,
The outer friction plate is one of the main parts of the gearbox of our five ton hydraulic drive forklift truck. The material is 65Mn steel (M = 4, Z = 45); the required hardness is HRC44 ~ 49 and the butterfly degree is 0.25 ~ 0.55 figure 1). Which the pros and cons of a direct impact on the normal use of the forklift, butterfly degrees less than 0.25, the work is not open the friction plate, greater than 0.55, the gearbox oil temperature and forced to stop working. We used the conventional process, the degree of butterfly does not meet the technical requirements, and later by the “solution-desolvation changes in the process may produce dynamic superplastic phenomenon” [1, 2] inspired to improve the tempering process , Has achieved satisfactory results. 1. The original process and results ① quenching the workpiece in the RJX-30-type furnace heating,