Abstract:  By analyzing the machining principles of helical milling and calculating the motion vectors in machining processes， an analytical model of cutting force in helical milling processes was established combined with the influences of side edges and bottom edges on cutting forces. The identification method of cutting force coefficient was put forward based on oblique cutting， and the constraint equations of friction angle， shear angle， and shear stress were derived according to the geometric relationships of oblique cutting processes. The experiments for identification of cutting force coefficient and helical milling of titanium alloys were carried out to verify the simulation values. The results show that the errors between the simulated and the experimental cutting forces are small， while the average error is as 9.55%， which verifies the validity of the oblique cutting coefficient identification method and the correctness of the cutting force model.

Key words:  , helical milling, titanium alloy, cutting force, oblique cutting, cutting force coefficient identification

摘要： 通过分析螺旋铣孔的加工原理和计算加工过程中的运动向量，结合侧刃和底刃对切削力的影响，建立了螺旋铣孔过程的切削力解析模型。提出了基于斜角切削的切削力系数辨识方法，并根据斜角切削过程几何关系推导出摩擦角、剪切角、剪切应力的约束方程。开展切削力系数辨识试验和钛合金螺旋铣孔试验对仿真值进行验证，结果表明，切削力的仿真值与试验值误差较小，平均误差为9.55%，从而验证了斜角切削系数辨识方法的有效性和切削力模型的正确性。

关键词: 螺旋铣孔, 钛合金, 切削力, 斜角切削, 切削力系数辨识