考虑时变性热强度和时变性热量分配比的铣刀前刀面瞬态温度场建模研究

Modeling Research on Transient Temperature Field of Rake Face on End Mills Considering Time-varying Heat Intensity and Time-varying Distribution Ratio

高速周铣是一种加工范围广和生产效率高的机械加工方式,其加工过程中会出现大量铣削热,尤其是加工导热率较低的工件时更为显著,铣削温度上升和下降的周期性变化会加速刀具磨损,进而降低工件表面加工质量。由于目前在周铣加工研究中缺乏对铣刀前刀面瞬态温度场的研究,为此,综合考虑第二变形区时变性热强度、时变性热量分配比以及前角因素,提出了一种基于"移动热源法"的铣刀前刀面瞬态温度场建模方法。首先建立第一变形区热源影响下的铣刀前刀面瞬态温度场温升模型,其次建立第二变形区热源影响下的铣刀前刀面瞬态温度场温升模型,最后进行温升模型叠加计算,进而建立铣刀前刀面瞬态温度场模型。仿真与试验结果验证了模型的准确性,该模型将进一步为研究铣刀前刀面抗磨设计提供理论支持。

High-speed peripheral milling is a kind of mechanical processing method with wide processing range and high production efficiency. There will be a lot of milling heat during the milling process, especially when the workpiece with low thermal conductivity is processed, the periodic change of milling temperature will accelerate tool wear, and then reduce the workpiece surface processing quality. Due to the lack of research on transient temperature field of rake face of end mills in the research of peripheral milling at present, against the context, a modeling method of transient temperature field of rake face of end mills is proposed based on "moving heat source method" considering the time-varying heat intensity, time-varying heat distribution ratio and rake angle in the second deformation zone. Firstly, transient temperature field of rake face of milling cutter under the influence of the first deformation zone heat source is developed. Then, transient temperature field of rake face of milling cutter under the influence of the second deformation zone heat source is developed. Finally, the temperature rise model superposition calculation is carried out, and then the prediction model of transient temperature field of rake face is modeled. The accuracy of the model is verified by simulation and experiments results, theoretical support be provided for further research on the wear resistance design of rake face of milling cutter.