超精密加工表面材料回弹与刀具刃口几何参数对切削力的影响规律

Influence of surface material rebound and tool edge geometry parameters on cutting force in ultra-precision machining

  • 摘要: 针对超精密切削加工过程中,工件材料被去除行为受加工表面弹性回复与刀具刃口结构共同影响,导致切削区域弹塑性变形复杂、切削力预测难度大等问题。文章提出考虑加工表面回弹与刀具刃口影响的超精密切削力预测方法,建立了工件材料回弹效应形成的刀工接触面积计算模型,分析了切削变形摩擦角随切削速度的变化规律,探明了超精密切削表面回弹与刃口几何对切削力的影响机制;基于剪切平面力平衡方程构建了切削力解析预测模型,并通过不同加工参数下的微槽结构超精密车削实验验证了切削力模型的可靠性。研究结果表明,所建立的切削力预测模型平均相对误差为5.9%,最大预测误差为10.8%,本研究可为超精密切削力解析预测及工艺参数优选提供理论支撑。

     

    Abstract: In the process of ultra-precision cutting, the removal behavior of workpiece material is influenced by the elastic recovery of the machining surface and the structure of the tool edge, resulting in complex elastic-plastic deformation in the cutting area and difficulty in predicting cutting forces. A prediction method for ultra-precision cutting force considering the surface rebound of the processed surface and the influence of the tool edge was proposed. A calculation model for the contact area formed by the workpiece material's rebound effect and the tool was established. The variation law of the friction angle of cutting deformation with the cutting speed was analyzed. The mechanism of the influence of surface rebound and the geometric shape of the tool edge on the cutting force in ultra-precision cutting was clarified. A cutting force analytical prediction model was constructed based on the shear plane force balance equation, and the reliability of the cutting force model was verified through ultra-precision turning experiments of micro groove structures under different machining parameters. The research results show that the average relative error of the established cutting force prediction model is 5.9%, and the maximum prediction error is 10.8%. This study can provide theoretical support for the analysis and prediction of ultra-precision cutting force and the optimization of process parameters.

     

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