Dynamic Characteristic Analysis and Structural Optimization of Entire Double-Shaft-Driven Needle Punching Machine for C/C Crucible Preforms

Abstract

Double-shaft-driven needle punching machine is a specialized equipment designed for processing C/C crucible preforms. Its main needle punching module is operated by two sets of reciprocating crank-slider mechanisms. The intense vibration during needle punching not only generates huge noise, but also substantially reduces the quality of the preform. It is imperative to perform a dynamic analysis and optimization of the entire needle punching machine. In this paper, the three-dimensional(3D) model of the entire double-shaft-driven needle punching machine for C/C crucible preforms is established. Based on the modal analysis theory, the modal characteristics of the needle punching machine under various operating conditions are analyzed and its natural frequencies and vibration modes are determined. The harmonic response analysis is then employed to obtain the amplitude of the needle plate at different frequencies, and the structural weak points of the needle punching machine are identified and improved. The feasibility of the optimized scheme is subsequently reevaluated and verified. The results indicate that the first six natural frequencies of the machine increase, and the maximum amplitude of the needle plate decreases by 70.3%. The enhanced dynamic characteristics of the machine significantly improve its performance, enabling more efficient needle punching of C/C crucible preforms.

Keywords

needle punching machine / dynamic characteristic / modal analysis / harmonic response analysis / structural optimization

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Funding

Open Project of Shanghai Key Laboratory of Lightweight Composite, China(2232021A4-04)