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螺旋铣孔技术有较高的加工质量及加工效率,得到国内外广泛关注.但在小孔加工过程中,在螺旋铣刀小直径、大长径比和径向切削力的共同作用下,刀具易发生挠曲变形,导致较大的孔径误差.针对此问题,通过研究刀具受力挠曲变形规律,结合切削力与刀具挠曲变形量间的耦合关系,建立了螺旋铣孔切削力的柔性预测模型;并基于镜像对称原理和迭代算法对孔径进行误差补偿.试验结果表明,补偿之后孔径误差由约35,μm降低到5,μm左右,极大改善了小直径孔的加工质量.
Spiral milling technology has a higher processing quality and processing efficiency, has been widely concerned at home and abroad.But in the small hole processing, small diameter helical cutter, large aspect ratio and radial cutting force under the joint action of the cutter It is easy to bend and deform, resulting in a large aperture error.In view of this problem, by studying the law of flexural deformation of the tool and combining the coupling relationship between cutting force and tool deflection, the cutting force flexibility The model is predicted and the error of the aperture is compensated based on the mirror symmetry principle and the iterative algorithm.The experimental results show that the aperture error is reduced from about 35μm to about 5μm after compensation and the processing quality of the small diameter hole is greatly improved.