Capacity analysis of workpiece bending vibrations effect on self-excitation under deep-hole drilling of low-rigid parts made of heterogeneous material

A production facility model to be used under the deep-hole drilling of large-diameter tube plates with a heterogeneous structure made of hard-to-machine materials is presented. Dynamic properties of the object as a composite membrane with several anchorage points are analyzed. Modes of the workpiece vibrations with account for its internal heterogeneous structural features are defined. The object structure transformation in the course of processing (the formation of a large number of holes) effects on its elastic and dynamic properties. Such effect features are considered. To simplify the practical application of the model, some recommendations for the global stiffness matrix transformation, and the production facility dissipation to the local points corresponding to the application places under the hole making are given. The research results are focused on the creation of an automatic control system for the deep-hole drilling of hard-to-machine and heterogeneous materials.