A brazed chip breaker capable of controlling the chip curling and flow is proposed on the rake face of a polycrystalline diamond (PCD) tool to obtain ideal chip shape of aluminum alloy materials. Two new position parameters, the breaker-point distance and the rotation angle of chip breaker, are proposed for positioning the chip breaker on the rake face of PCD turning tool. Influences of two position parameters of the chip breaker on the chip curling and chip flow direction are studied through finite element simulations and cutting experiments. The appropriate breaker-point distance can improve the up-curling and back-flow of the chip, and control the chips flow to the tool flank face to form a C-shaped chip. After setting the appropriate breaker-point distance, increasing the rotation angle of chip breaker can promote the trend of side-curling and side-flow of the chip, which is beneficial to the formation of short helical chip. Based on the chip-breaking criterion and the geometric relationship between the chip breaker and tool rake face, the equations of two position parameters of chip breaker are established, and effective chip breaking can be achieved within the reasonable range of chip breaker position parameters calculated by the established equations. The proposed chip breaker which position parameters are convenient to measure and install can be brazed on turning and drilling tools to obtain needed chip shape of aluminum alloy materials.

在聚晶金刚石（PCD）刀具的前刀面上提出了一种能够控制切屑卷曲和流动的钎焊断屑槽，以获得铝合金材料的理想切屑形状。提出了两个新的位置参数，即断屑点距离和断屑器旋转角，用于在PCD车刀前刀面上定位断屑器。通过有限元仿真和切削实验研究了断屑槽两个位置参数对切屑卷曲和切屑流向的影响。适当的断屑点距可以改善切屑的上卷曲和倒流，控制切屑流向刀具后刀面，形成C形切屑。设置合适的断点距离后，增大断屑槽的旋转角度可以促进切屑的侧卷和侧流趋势，有利于短螺旋切屑的形成。基于断屑判据和断屑槽与刀具前刀面的几何关系，建立断屑槽两个位置参数方程，在由下式计算得到的断屑槽位置参数合理范围内实现有效断屑已建立的方程。所提出的断屑槽位置参数便于测量和安装，可以钎焊在车刀和钻刀上，以获得铝合金材料所需的切屑形状。基于断屑判据和断屑槽与刀具前刀面的几何关系，建立断屑槽两个位置参数方程，在由下式计算得到的断屑槽位置参数合理范围内实现有效断屑已建立的方程。所提出的断屑槽位置参数便于测量和安装，可以钎焊在车刀和钻刀上，以获得铝合金材料所需的切屑形状。基于断屑判据和断屑槽与刀具前刀面的几何关系，建立断屑槽两个位置参数方程，在由下式计算得到的断屑槽位置参数合理范围内实现有效断屑已建立的方程。所提出的断屑槽位置参数便于测量和安装，可以钎焊在车刀和钻刀上，以获得铝合金材料所需的切屑形状。