基于动态切削力系数的插铣加工过程稳定性研究

发布时间：2018-10-26 07:47

【摘要】：插铣过程中切削力系数随切削参数的改变而变化,但在切削力仿真和稳定性边界绘制过程中总假定切削力系数是不变的,这样使得预测结果误差较大。针对上述问题,以冲击式水轮机水斗材料0Cr13不锈钢插铣过程为研究对象,结合修正的插铣力模型,采用正交试验法、平均铣削力法及偏最小二乘法得到随切削参数变化的动态切削力系数模型。对模型系数标准化分析得到影响切削力系数tK、rK和aK大小的最主要因素分别为进给量、径向切宽和进给量。基于动态切削力系数对插铣加工过程切削力及稳定性进行了研究,使用恒定切削力系数、动态切削力系数分别得到切削力仿真与稳定性边界,验证试验结果表明动态切削力系数的仿真精度更高,结果为冲击式水轮机水斗插铣加工工艺优化和刀具设计提供理论支持。
[Abstract]:The cutting force coefficient changes with the change of cutting parameters in the process of insert milling, but it is always assumed that the cutting force coefficient is invariant in the process of cutting force simulation and stability boundary drawing, which makes the prediction result more error. Aiming at the above problems, taking 0Cr13 stainless steel insert milling process as the research object, combined with the modified insert milling force model, the orthogonal test method is adopted. The dynamic cutting force coefficient model with the change of cutting parameters is obtained by the mean milling force method and partial least square method. Based on the standardized analysis of the model coefficients, the main factors affecting the cutting force coefficients tK,rK and aK are feed rate, radial tangent width and feed rate, respectively. Based on the dynamic cutting force coefficient, the cutting force and stability of the insert milling process are studied. The constant cutting force coefficient and the dynamic cutting force coefficient are used to obtain the cutting force simulation and stability boundary, respectively. The experimental results show that the simulation accuracy of dynamic cutting force coefficient is higher. The results provide theoretical support for optimization of water bucket insert milling process and tool design of impact turbine.
【作者单位】：哈尔滨理工大学机械动力工程学院;
【基金】：国家自然科学基金(51575147,51235003) 哈尔滨理工大学青年拔尖人才支持计划(201507)资助项目
【分类号】：TG54

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