Abstract
This study investigates the chattering stability of the composite boring bar with a constrained damping layer during the deep-hole boring process in depth. Based on the Euler-Bernoulli beam theory, the regenerative chattering linear kinetic model of the composite boring bar with a constrained damping layer was established, and the computational formulas of the rotating speed of the spindle and the corresponding limit cutting depth were derived. By analyzing the chattering stability, the cutting stability lobe curves of the composite boring bar with a constrained damping layer were plotted so as to reveal the effects of the materials of both base layer and constrained layer, the ply angle, the damping composite structure (free or constrained damping structure) and the thickness of various layers on the chattering stability of the boring bar. Through the analysis of dynamic stiffness, the chatter stability analysis theory of a composite boring bar with a constrained damping layer is verified.
Highlights
With the development of modern industrial technology, deep-hole processing has witnessed more and more extensive applications in many domains, accompanied by increasingly high requirements on processing precision and quality [1]
The results showed that the chattering amplitude of the composite boring bar was far below that of the ordinary boring bar, suggesting the favorable vibration suppression performance of the composite boring bar
The damping matrix materials, and their mechanical properties are shown in Tables 1–3, respectively.layer
Summary
With the development of modern industrial technology, deep-hole processing has witnessed more and more extensive applications in many domains, accompanied by increasingly high requirements on processing precision and quality [1]. High-precision deep-hole boring has become difficult in machining since cutting chattering is extremely generated during the machining process. This can be attributed to a great length-to-diameter ratio and small dynamic rigidity of the metal-boring bar, thereby reducing processing quality and machining quality on the surface of the workpiece. Research demonstrates that a steel cutter may reach the performance limit in mechanical processing when the overhanging length-to-diameter ratio exceeds 4 (L/D > 4). Because of great rigidity, a hard alloy cutter may have an overhanging length-to-diameter ratio of up to
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