内螺纹铣削力预测模型及试验研究

Mathematical Prediction Model and Experimental Research for Internal Thread Milling Cutting Forces

通过分析内螺纹铣刀的铣削机理和切屑厚度，确定内螺纹加工的主轴转速、进给率、刀具几何参数，提出了一种通用的内螺纹铣削力数学预测模型，研究内螺纹铣削力的变化规律。结合具体的铝合金7075内螺纹加工试验来验证本数学预测模型。试验研究表明，切削力在x方向，其分量力最大，对铣刀旋转角度的变化也最为敏感，力分量最小为Y方向分量，对铣刀旋转角度的变化最不敏感。试验结果与所建立切削力预测模型在力变化趋势上以及分力数值上都很好的匹配。数学模型所预测切削力-9试验所测数据平均误差控制在10％以内，从而验证了所建数学模型的精确性。

This paper presents a common mathematical prediction modehng ior tnreao mmmg iort：e~ oy u,,aty-zing the thread cutting mechanics and the chip thickness, and determining the spindle speed, federate, and tool ge-ometry parameter. The relationships between milling forces and other cutting parameters are studied. The mathemati-cal prediction model is calibrated and validated for 7075 Aluminum. The experimental research shows that the cut-ting forces in the x - direction are greater than other two component forces, and the peak - to - valley force is muchsensitive about the effect of rotational angle. The cutting force in the y - direction is more smooth and uniform thanother two component forces. The simulated cutting force profiles are well matched with the experimental force pro-file. The model predicts the experiments on average within 10% error. The experimental data exactly verify the es-tablished mathematical model.