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130×12×1300mm大型T8A钢切纸刀片,要求整体淬硬达HRC50-55,翘曲不超过0.2mm,切纸刀单边开了斜面刃口,工件形状不对称,淬火时快冷面凸起,使工件易沿两个方向翘曲,如图1往往因无法校正而报废。我厂生产了几批切纸刀,开始由于没有掌握热处理操作要领,合格率只有80%,经过几年的实践摸索,改进工艺,合格率提高到100%。热处理工艺如下: (1)淬火加热用通有保护气氛振底炉(不振动)刃口朝上侧立加热,或用75kW气体渗碳炉垂直吊挂加热(滴煤油保护),加热温度800～820℃,加热时间为30min。
130 × 12 × 1300mm large T8A steel cutting blades, requiring the overall hardened up to HRC50-55, warpage does not exceed 0.2mm, the cutter side opened a beveled edge, the workpiece shape is asymmetric quenching quick cold convex Starting, so that the workpiece is easy to warp in both directions, as shown in Figure 1 are often scrapped because they can not be corrected. I produced several batches of paper cutter factory, began to fail to grasp the essentials of heat treatment, the passing rate of only 80%, after several years of practice to explore and improve the process, the passing rate increased to 100%. Heat treatment process is as follows: (1) Quenching heating with a protective atmosphere through the hearth vibrator (not vibration) vertical upright edge heating, or vertical furnace with 75kW gas carburizing heating (drop of kerosene protection), heating temperature 800 ~ 820 ℃, heating time is 30min.