基于径向基函数的AL2A12薄壁件铣削稳定性研究

发布时间：2018-03-23 17:56

本文选题：薄壁件　切入点：铣削稳定性　出处：《振动与冲击》2017年03期

【摘要】：在薄壁件铣削过程中,颤振对工件表面质量有很大影响,在实际加工之前进行铣削稳定性预测,便于获取无颤振的加工条件。基于径向基函数逼近理论,提出一种铣削稳定性预测方法。通过试切法和锤击法获得了AL2A12薄壁件的切削力系数和模态参数,并基于所提出的方法推导了系统的状态转移矩阵,通过Floquet定理来判定系统的稳定性,从而获得了AL2A12薄壁件铣削过程的稳定性图。为了验证所提方法的计算效率,采用相同的系统参数来进行计算。通过与零阶半离散法和全离散法相比,表明在获得的铣削稳定性图一致的前提下,所提方法的计算效率最高。在预测的稳定性图中选择4个参数点,利用参数点所对应主轴转速和轴向切深来加工AL2A12薄壁件,将实际加工结果与稳定性预测结果进行比较,验证了所提预测方法的有效性。通过实际切削表明,在AL2A12薄壁件的加工过程中,当轴向切深相近时,较高的主轴转速可以获得更好的加工表面,同时也可以避免黏刀现象的产生。
[Abstract]:In the process of thin-walled parts milling, chatter has a great influence on the surface quality of workpiece. The milling stability is predicted before the actual machining, and the processing conditions without chatter can be obtained easily, based on the radial basis function approximation theory. A method for predicting milling stability is proposed. The cutting force coefficients and modal parameters of AL2A12 thin-walled parts are obtained by means of trial cutting method and hammering method, and the state transfer matrix of the system is derived based on the proposed method. The stability diagram of the AL2A12 thin-walled milling process is obtained by using Floquet theorem to determine the stability of the system. In order to verify the computational efficiency of the proposed method, The same system parameters are used for calculation. Compared with zero order semi-discrete method and full discrete method, it is shown that the obtained milling stability graph is consistent. The proposed method has the highest computational efficiency. Four parameter points are selected in the predicted stability diagram, and the spindle speed and axial tangent depth corresponding to the parameter points are used to process thin-walled AL2A12 parts, and the actual processing results are compared with the stability prediction results. The validity of the proposed prediction method is verified. The actual cutting results show that, when the axial tangent depth is close, the higher spindle speed can obtain better machining surface in the process of AL2A12 thin-walled parts machining. At the same time, the phenomenon of sticky knife can be avoided.
【作者单位】：北京理工大学机械与车辆学院;
【基金】：国家自然科学基金面上项目(51375055;51575050)
【分类号】：TG54

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