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为了提高自制高速钢刃具的刃部耐磨性,减少“粘刀”现象,我们对四种W18Cr 4 V 高速钢刃具进行了气体软氮化处理试验。试验采用N(C_2H_4OH)_3(三乙醇胺)与酒精1:1的混合液为渗氮剂。被试验的刀具有:φ70毫米花键滚刀、φ32毫米立铣刀、φ10.2毫米麻花钻头和1/2时14牙布锥。这些刀具在氮化处理前均经过淬火及回火处理。氮化工艺如下:氮化处理前,将工件、炉罐及工具用酒精洗净,当炉温达到560℃时,即将悬挂好的工件放入炉内,并开始以100滴/分的速度滴入三乙醇胺与酒精的混合液,以排除炉内的空气,排气约半小时,炉温又升到560℃开始保温,渗氮剂滴入量改为70滴/分,保温三小时后在炉内降温,此时渗氮剂滴入量改为35～40滴/分。温度降到500℃后,再改为10滴/分。当温度降到450℃时,将工件取出油冷。
In order to improve the blade wear resistance of homemade high-speed steel cutting tools and reduce the “sticking knife” phenomenon, we conducted gas nitrocarburizing tests on four W18Cr 4 V high-speed steel cutting tools. Test using N (C_2H_4OH) _3 (triethanolamine) and alcohol 1: 1 mixture of nitriding agent. The knives tested were: φ70 mm spline hob, φ32 mm end mill, φ10.2 mm twist drill and 1/2 hour 14 toothbrush. These tools are hardened and tempered before nitriding. Nitriding process is as follows: nitriding before the workpiece, furnace and tools with alcohol wash, when the furnace temperature reaches 560 ℃, the workpiece will be suspended into the furnace, and began to drop 100 points / min Into triethanolamine and alcohol mixture to exclude the furnace air, exhaust about half an hour, the furnace temperature and then rose to 560 ℃ began to heat, nitriding dropped to 70 drops / min, after three hours of incubation at Furnace cooling, nitriding drops at this time changed to 35 to 40 drops / min. After the temperature dropped to 500 ℃, then changed to 10 drops / min. When the temperature dropped to 450 ℃, the workpiece will be taken out of oil cooling.