Instantaneous Milling Force Model and Verification of Unequal Helix Angle End Mill

With the urgent demand for lightweight trends in aerospace, milling is an indispensable processing method for weak stiffness components such as frames. However, the instantaneous force changes during the milling process lead to vibration and machining deformation of weak stiffness components such as thin-walled structural components, which is the technical bottleneck.The unequal division of pitch and helix angle for end mills has been proven to be an effective method for suppressing chatter.However, changes in cutting force are the root cause of inducing process system chatter, and the mechanical behavior of milling weak stiffness structural components with unequal helix angle end mills has not yet been improved. Based on this, a mathematical model for instantaneous milling force of unequal helix angle end mills is established. Firstly, the angle position relationship under circumferential planarization of unequal helix angles is analyzed, and the influence of axial time-varying characteristics between cuttin