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为了改善丝杠轴向热位移对机床加工精度的影响,通过对丝杠进给系统的摩擦学、传热学研究,建立了丝杠进给系统的热学模型,并运用有限元法探讨了丝杠进给系统在热源作用下的稳态温度场和热变形情况。通过仿真实验得到丝杠轴向热位移为31.86μm,而理论计算得到的丝杠轴向热位移为31.74μm,通过热伸长仪测得的丝杠轴向变形量为31.81μm,因此验证了该模型的正确性,可以为丝杠进给系统的误差补偿提供参考。
In order to improve the influence of the axial thermal displacement of the screw on the machining accuracy, the thermal model of the screw feed system was established through the study of tribology and heat transfer of the screw feed system. The finite element method Steady state temperature field and thermal deformation of bar infeed system under heat source. The thermal axial displacement of the screw was 31.86μm obtained through the simulation experiment. The axial thermal displacement of the screw calculated theoretically was 31.74μm. The axial deformation of the screw measured by the thermal elongation meter was 31.81μm. The correctness of the model can provide reference for the error compensation of lead screw feeding system.