含硫齿轮钢20CrMnTiH中硫化物对切削性能的影响

在不同切削速度(200～230 m/min)和切削深度(0.5～2 mm)下试验研究了普通20CrMnTiH齿轮钢(0.006%S)和含硫20CrMnTiH齿轮钢(0.031%S)的切削性能。结果表明,随切削速度增大,刀具的磨损增大,在200 m/min,0.031%S钢是0.006%S钢刀具的使用寿命的2.8倍;在230 m/min,0.031%S钢是0.006%S钢刀具使用寿命的2.6倍;随切削深度增加,切削力增加,但在相同切削深度下,0.031%S钢的切削力低于普通0.006%S钢;由于0.031%S钢存在≤6μm的MnS夹杂,使切屑易断,并硫化物夹杂能够包裹Al₂O₃尖晶石夹杂,减少刀具磨损,提高钢材的切削性能。

Effect of Sulphide on Cutting Characteristics of Sulphur Bearing Gear Steel 20CrMnTiH

The cutting characteristics of common gear steel 20CrMnTiH（0.006%S） and sulphur bearing gear steel 20CrMnTi（0.031%S） with different cutting speed（200～230 m/min） and cutting depth（0.5～2 mm） have been tested and researched.Results show that with increasing cutting rate,the wear of tool increases,with cutting speed 200 m/min the service life of 0.031%S steel is 2.8 fold as long as that of 0.006%S steel and with cutting speed 230 m/min the service life of 0.031%S steel is 2.6 fold as long as that of 0.006%S steel;with increasing cutting depth the cutting force increases, but with definite cutting depth the cutting force of 0.031%S steel is lower than that of common 0.006%S steel; As there are≤6μm MnS inclusions in 0.031%S steel,the chips are easily broken,and the manganese sulphide is able to clad Al₂O₃ spinel inclusions led to decrease of tool wear and increase of cutting characteristics of steel products.