水蒸气冷却润滑时高温合金的绿色切削试验

为实现高温合金用水蒸气作冷却润滑剂的绿色切削,研制了600~800 W的小型过热水蒸气发生器,并用YG 6硬质合金刀具对镍基高温合金GH 4169进行了单因素切削试验,效果明显:用水蒸气时,与干切、乳化液相比,主切削力分别减小了15%~20%和10%~15%,切削温度分别降低了20%~30%和10%~20%,并建立了切削力和切削温度的经验公式;变形系数也有减小;切屑多为螺卷屑。由于水蒸气分子直径远小于乳化液中水包油粒径,气态水分子容易进入刀-屑间的毛细管,故具有良好的冷却润滑性能。水蒸气可替代乳化液作冷却润滑剂,且来源广泛,又无污染,从而可实现高温合金的绿色切削。

Green Cutting of Superalloys as Water Vapor Cooling and Lubricating

To achieve green cutting of superalloys with superheated water vapor cooling and lubricating,a 600--800 W min itype generator is developed.The single {actor experiments arc completed with YG6 tools cutting GH4169.Results show that using superheated water vapor,compared with dry and wet cutting,the main cutting force decreases about 15%-20% and 10%-15%,respectively ; the cutting temperature reduces about 20%-30% and 10%-20%; the de{ormation coefficient also decreases; the chips are mostly helical.The empirical equations of cutting forces and the temperature are obtained.The diameter of the water molecule is much less than that of O/W in the cutting fluids.The water molecule can easily penetrate the capillary in the tool-chip interface.Results indicate that the application of the water vapor can realize the green cutting of superalloys.