铣削层厚度模型很大程度上影响着铣削加工瞬时铣削力计算精度，在每齿进给量较小情况下能较好地反映铣削层厚度的瞬时变化，但在每齿进给量较大情况下铣削层厚度计算精度不足。该文分析铣削刃随刀具旋转和工件进给的运动规律，建立铣削刀具次摆线轨迹模型，给出铣削起始角和终止角，提出一种基于次摆线轨迹的铣削层厚度模型。通过与现有圆弧模型和等效均匀厚度模型对比，结果表明：该模型在不同每齿进给量下均能保证较高准确性。
The milling-layer thickness model greatly affects the prediction accuracy of instantaneous milling forces. Current milling layer thickness models can accurately predict the instantaneous change in the milling layer thickness foe small feed rates per tooth, but are less accurate with large feed rates per tooth. The study analyzes the milling blade movement pattern as the tool rotates and the work-piece feeds in to the tool. The model predicts the trochoid trajectory and the milling start and end angles. The milling-layer thickness model is then based on the trochoid trajectory. Trochoid trajectory model is more accurate for both large and small feed rates per tooth than the circle model and the equivalent uniform thickness model.
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