基于改进瞬时刚性力模型的机床铣削加工监测

针对用于切削力预测的瞬时刚性力模型所需参数较多且依赖初步切削实验的问题，提出一种不需要切削实验的新型切削力预测方法，实现在实际工厂中监测机床铣削加工过程。在斜角切削模型和正交切削理论的基础上，对传统的瞬时刚性力模型进行改进，减少切削力预测所需的切削参数。改进后的模型仅需在铣削操作开始时从测量的主轴电机扭矩得到的剪切角参数，无需任何额外的传感器就可以实现铣削力预测。在所提模型中，刀具跳动的影响可通过每个切削刃处的旋转半径偏差表示，以精确预测切削力。为验证该模型的有效性，进行切削实验。结果表明：切削力的预测值与实测值吻合较好，在实际加工过程中，无需任何实验铣削或任何额外的力传感器就可以准确了解机床加工状态。

Monitoring of Machine Tool Milling Based on Improved Instantaneous Rigid Force Model

Aiming at the problem that the instantaneous rigid force model used for cutting force prediction needs many parameters, and these parameters must be determined in advance through preliminary cutting tests, a new cutting force prediction method without cutting tests was proposed, which could be used to monitor the milling process in actual factories. Based on the bevel cutting model and orthogonal cutting theory, the traditional instantaneous rigid force model was improved to reduce the number of cutting parameters needed for cutting force prediction. In the improved model, only the shear angle parameter was needed which identified from the measured spindle motor torque at the beginning of milling operation, the milling force could be predicted without any extra sensors. In the proposed model, the influence of tool runout was expressed by using the deviation of rotation radius at each cutting edge to accurately predict the cutting force. In order to verify the validity of the model, cutting experiments were carried out. The results show that the predicted value of cutting force is in good agreement with the measured value, in the actual machining process, the machining state can be accurately known without any test milling or any additional force sensor.