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高速钢刃具返修时,我们采用盐浴炉快速退火来代替电炉等温退火,退火时间由原来12小时缩短到3小时,提高工作效率4倍左右。快速退火的工艺是:将急于返修并要退火的刃具用鉄丝捆扎或用盘装,放在880～900℃中型电极盐浴炉(C—45型,盐浴成分是氯化银78％+氯化钠22 ％)中加热,保温0.5～1小时后取出,把工件降温到720～750℃等温1～1.5小时,再降温到600℃左右出炉空气冷却。这种方法只适用于返修的高速钢刃具;盐浴炉可以采用高速钢刀具第二次予热炉。退火结果,硬度在布氏205～255,金相
When reworking high-speed steel blades, we use salt bath furnace rapid annealing instead of electric furnace isothermal annealing, annealing time from the original 12 hours to 3 hours, improve work efficiency about 4 times. Rapid annealing process is: the eager to rework and to be annealed cutting tools tied with silk or plate, placed 880 ~ 900 ℃ medium-sized electrode salt bath furnace (C-45 type salt bath composition is 78% silver chloride + Sodium chloride 22%) heating, insulation 0.5 ~ 1 hour after the removal of the workpiece cooling to 720 ~ 750 ℃ isothermal for 1 to 1.5 hours, and then cooled to about 600 ℃ baked air cooling. This method is only applicable to the rework of high-speed steel cutting tools; salt bath furnace can be used for the second high-speed steel tool preheater. Annealing results, hardness in Brinell 205 ~ 255, metallographic