立铣切削力分类研究及精确铣削力模型的建立

Study of the Classification of Cutting Forces and the Build of the Accurate Milling Force Model in End Milling

提出了一种根据切削力变化曲线的形状特征精确建立铣削力预测模型的方法。以立铣加工过程为研究对象,基于静力模型,研究铣削力的变化规律和切削用量的关系,总结了6种不同切深组合下的铣削力类型并分别给出理论的切削力随刀具旋转的变化曲线图,基于切削力交叠程度又将切削力细分为10类。在此基础上通过定义切削力分析指标,得到了基于切削力曲线形状特征的实际切深的计算方法。根据理论分析结果,提出在不同切深组合下分别建立铣削力模型的观点,实际切深的应用使得模型更加精确,更重要的是根据该切削力分类来组织试验,针对性加强,试验数据更可信。通过合理安排试验,验证了该理论的正确性。

A new approach is proposed to modeling the milling force based on the cutting force shape characteristics in end milling. The relationships between the cutting forces and the cutting depths are analyzed and the cutting forces are classified into six types according to the combination of cutting depths, and then into ten types based on the degree of overlap. Meanwhile, the theoretical cutting force curve is provided correspondingly. Furthermore, force indices are extracted from the cutting forces and then the real cutting depths are detected based on the changes of the force shape characteristics via the force indices in the end-milling process. Through the theoretical analyzed results, a method of modeling cutting-force based on the six milling force types is brought forward, and the use of the real cutting depth make the model to be more accurately. More importantly,experiments designed on the classification of milling forces strengthen the pertinence, and make the experiment data more reliable at the same time. The approach is validated through cutting experiments.