【摘要】 为实现尖角加工过程中铣削力的精确预测,给出了工件轮廓与刀具路径的参数化统一表示方法,分析了两种情况下的铣削工艺过程,依据铣削特征化分为五个阶段,推导出每个铣削阶段的实际径向切深算式。基于实际径向切深,给出了切入/切出角的计算方法,建立了尖角加工的瞬时铣削力模型。利用直线铣削完成了切削力系数辨识,对尖角加工的瞬时铣削力进行预测,并进行试验验证,结果表明预测铣削力与实测铣削力具有良好的一致性,证实了铣削力模型的有效性和精确性,从而为工艺参数优化和颤振抑制提供了理论基础。更多还原

【Abstract】 To predict milling force accurately for sharp corner machining,a method is proposed to describe workpiece contour and tool path uniformly with parametric representation. According to sharp corner size,milling process is analyzed in two cases. Also,the milling process is divided into five stages considering milling characteristic. Then,calculating formulas of actual radial cutting depth for milling stages are deduced. With the actual radial cutting depth,a method is presented to calculate the entry/exit angles. Thus,a model is presented to predict the instantaneous milling force for sharp corner machining. A straight line milling test is carried out to calibrate the cutting force coefficients. With the coefficients,instantaneous milling force for sharp corner machining is predicted. Also,sharp corner milling test is carried out to verify the presented method. A good agreement between predicted results and experimental results is achieved,which shows that the presented model is efficient and accurate. The research can provide theoretical foundation for milling parameters optimization and chatter suppression.更多还原