The objective of this study was to provide insights for a deeply understanding of the threads surface integrity manufactured by cutting tap, rolling tap, cutting insert and with internal thread rolling head, using the multiscale surface texture and fractal analysis in order to show the performance of the internal rolling head by mechanical tests and also to highlight the advantages of rolling internal threads. A series of eight internal thread samples M80 × 1.5 manufactured by cutting insert and internal thread rolling head were analyzed on their surface texture characteristics and material properties. Surface characteristics of low carbon steel Ç1020 (equivalent to AISI 1020) were quantified by measuring four locations on regions of each sample. The threads made by cutting inserts and internal thread rolling head were subjected to tensile test and it was found that the average tensile load of threads made by internal rolling head is higher with 20% than the threads made by cutting insert. Furthermore, the internal thread sections of samples were analyzed using an optical projector by comparing the appearance of failed threads at low magnification to known failure modes, as well as scanning electron microscopy (SEM) for surface material characterization. It was found that it can be discriminate between the thread surface regions of samples manufactured by cutting insert and with internal thread rolling head, using area-scale analysis and surface texture characteristics. The surface micro-morphology results can be applied in studies about improving the lifetime of similar rolled threads and for mathematical modelling of lubrication processes between tool and workpiece.

这项研究的目的是通过多尺度的表面纹理和分形分析来深入了解由切削丝锥，轧制丝锥，切削刀片和带内螺纹滚压头制造的螺纹表面完整性，从而展示出螺纹的性能。内部滚动头通过机械测试，也突出了滚动内螺纹的优点。分析了切削刀片和内螺纹滚压头制造的一系列八个内螺纹样品M80×1.5的表面纹理特征和材料性能。低碳钢Ç1020（相当于AISI 1020）的表面特性通过测量每个样品区域的四个位置进行量化。对切​​削刀片和内螺纹滚压头制成的螺纹进行拉伸测试，发现内滚头制造的螺纹的平均拉伸载荷比切削刀片制成的螺纹高20％。此外，使用光学投影仪分析样品的内螺纹部分，方法是将低倍率下的失效螺纹的外观与已知的失效模式进行比较，并通过扫描电子显微镜（SEM）进行表面材料表征。发现使用面积尺度分析和表面纹理特征可以区分通过切削刀片和带内螺纹滚压头制造的样品的螺纹表面区域。