切削速度对精车AISIH13淬硬钢切削行为的影响

Effect of Cutting Speed on Cutting Behavior During Finish Turning Hardened AISIH13

为了探究淬硬钢的切削加工性能,采用YW2A细晶硬质合金刀具精车淬硬AISIH13钢,光学照相仪、测力仪(YDC-Ⅲ89B)、工具显微镜(XGJ-1)、扫描电镜(JSM5800LV)及便携式粗糙度仪(TR100)用于试验检测,分析了切削速度对切屑形成、切削力、刀具磨损及零件表面粗糙度的影响规律。结果表明,随着切削速度增大,切屑由连续性带状向C型节段演变,切削力、刀具后刀面磨损及工件表面粗糙度值均呈减小趋势;在试验切削速度范围内,前刀面以粘结磨损和氧化、扩散磨损为主,切削温度是主因,而后刀面以疲劳剥落为主,机械应力起主导影响。

In order to probe into the machinability of hardened steel,the finish turning of quenched AISIH13 steel was performed with YW2A fine cemented carbide cutters,and OM,Dynamometer( YDC-Ⅲ 89B),tool microscope( XGJ-1),scanning electron microscopy( JSM5800LV),and portable roughness tester( TR100) were used to study the effect laws of cutting speed on chip formation,cutting force,tool wear and surface roughness of parts. The results showed that the chip evolves from continuity strip to C type segment, and the cutting force,flank wear and part surface roughness decrease with the increase of cutting speed. The adhesive,oxidation and diffusion wear are dominated in the rake face,the cutting temperature is the main reason,while the fatigue spalling plays a leading role, the mechanical stress is the dominant effect in the range of trial cutting speed.