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研究了氧含量对硫系易切削钢中硫化物夹杂及对切削性能的影响。结果表明:在一定范围内,钢中氧含量越高越有利于改善切削性能,其原因是氧含量高时,钢中会形成大量的纺锤形(Mn、Fe)(S、O)复合夹杂物。在切削过程中,这类硫化物能割断基体的连续性,在刀具表面形成一层保护膜,从而降低刀具的磨损。实验室切削试验表明:w(O)=0.014%时,硫系易切削钢的切削性能优于45钢,能够获得理想的切削性能。
The effects of oxygen content on sulfide inclusions and their machinability in free cutting steels were studied. The results show that the higher the oxygen content in steel is, the better the cutting performance is. The reason is that a large amount of spindle-shaped (Mn, Fe) (S, O) composite inclusions are formed in the steel with high oxygen content . In the cutting process, this type of sulfide can cut the continuity of the substrate, forming a protective film on the tool surface, thereby reducing tool wear. Laboratory cutting tests show that the machinability of sulfur free cutting steel is better than that of 45 steel when w (O) = 0.014%, and the ideal cutting performance can be obtained.