ABSTRACT

Most of the studies on cutting mechanisms and surface integrity in turning are investigated with a straight tool path (longitudinal/end face turning) while few contributions have been done in curved surface turning. This work explores the evolutions of cutting force, chip morphology and surface integrity when turning a curved surface, using fillet surface machining of AISI 304 stainless steel. The varying cutting conditions caused by the presented turning are revealed by detailed geometric analysis and employed as indicators for further discussions on cutting force, chip morphology, and machined surface integrity (including surface roughness, microhardness, microstructure, and residual stress). Apart from the difference of cutting force components in tangential, radial, and cutting speed directions along the fillet surface, wider and thinner chips are obtained from end face turning. The measured microhardness, microstructural alternation, and stress condition results comprehensively illustrate a reduction of severe plastic deformation from the outer face to the end face.

摘要

大多数关于车削中切削机理和表面完整性的研究都是使用直线刀具路径（纵向/端面车削）进行研究的，而在曲面车削方面的贡献很少。这项工作探索了车削曲面时切削力、切屑形态和表面完整性的演变，使用 AISI 304 不锈钢的圆角表面加工。通过详细的几何分析揭示了由所提出的车削引起的不同切削条件，并用作进一步讨论切削力、切屑形态和加工表面完整性（包括表面粗糙度、显微硬度、微观结构和残余应力）的指标。除了沿圆角表面的切向、径向和切削速度方向上的切削力分量不同外，通过端面车削获得更宽更薄的切屑。测得的显微硬度、显微组织变化和应力条件结果综合说明了从外表面到端面的严重塑性变形的减少。