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我单位承接了一批模板的淬火任务,材料为45钢板,产品规格有400×350×60;350×250×50;300×200×40(mm)等几种.热处理技术要求为:调质处理后,在表层下2mm处的硬度为23～28HRC.模板原制造工艺流程为:下料(气割)→退火→粗加工→调质处理→精加工.原用的调质处理工艺如图1所示(在箱式电炉中加热).淬火操作时用钳子夹工件,单件冷却,冷却2～3min后再自由落于池中,继续冷却至水温后回火.按此工艺处理后的产品,表层硬度约有
My unit to undertake a number of quenching the task of the template, the material is 45 steel, product specifications are 400 × 350 × 60; 350 × 250 × 50; 300 × 200 × 40 (mm), etc. Several heat treatment technology requirements: After treatment, the surface hardness of 2mm at 23 ~ 28HRC template original manufacturing process is: cutting (gas cutting) → annealing → roughing → quenching and tempering → finishing.the original quenching and tempering process shown in Figure 1 (Heating in a box electric furnace) Quenching operation with pliers folder workpiece, a single cooling, cooling 2 ~ 3min and then free fall in the pool, continue to cool to the water temperature after tempering. Processed products according to this process , The surface hardness of about