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研究砂带磨削U71Mn钢轨试件的加工行为可为钢轨打磨提供基础试验数据支撑,并能探讨研发新型钢轨打磨技术关键问题.本文借助砂带试验机开展了磨削钢轨试件的加工试验,研究了砂带磨削速度、磨粒粒度等因素对材料去除效率、表面层硬度、表面粗糙度、磨削比、磨削力比的影响规律,试验表明:材料去除效率并非与砂带速度呈线性关系,较粗的磨粒与合适的砂带速度可提高材料去除效率;砂带磨削可不同程度地提高钢轨试件表层硬度,磨削速度越高、磨粒粒度越粗,对钢轨试件表面层硬化程度越明显;相比磨粒粒度而言,砂带磨削速度对表面粗糙度的影响较小;针对磨削比这一重要指标,砂带比砂轮呈现了较为明显的效益优势;磨削力比过程数据表明其变化趋势可用于表征砂带磨损.
The research on the processing behavior of abrasive belt grinding U71Mn rail specimen can provide basic test data support for rail grinding and discuss the key problems of developing new rail grinding technology.This paper carried out the processing test of grinding rail specimen with belt tester, The effects of abrasive grinding speed, abrasive particle size and other factors on the material removal efficiency, surface hardness, surface roughness, grinding ratio and grinding force ratio were studied. The results show that the material removal efficiency is not related to the belt velocity Linear relationship, coarse abrasive particles and proper belt speed can improve the material removal efficiency. Belt grinding can improve the surface hardness of rail specimen to different extent. The higher the grinding speed, the thicker the particle size, The more obvious the degree of surface hardening is. Compared with abrasive particle size, the effect of abrasive belt grinding speed on surface roughness is small. For the important index of grinding ratio, the belt has a more obvious benefit advantage than grinding wheel ; Grinding force ratio process data show that the trend can be used to characterize belt wear.