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双轴驱动C/C坩埚预制体针刺机是加工C/C坩埚预制体的专用设备，其主针刺模块由两套作往复运动的曲柄滑块机构驱动，在针刺过程中产生剧烈振动。振动不仅会产生较大的噪声，而且会严重降低预制体针刺质量，因此需对针刺机进行整机动态特性分析和优化以减少振动。该文建立双轴驱动C/C坩埚预制体针刺机三维模型。基于模态分析理论，对多个工况下针刺机的模态进行分析，确定其固有频率及振型。通过谐响应分析得到针板在不同频率下的振幅，确认针刺机结构的薄弱环节并进行优化，分析和验证优化后方案的可行性。结果表明：结构优化后针刺机的前六阶固有频率均有提升，针板最大振幅降低70.3%,整机动态特性良好，能更好地实现对C/C坩埚预制体的针刺。
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.
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Basic Information:
DOI：10.19884/j.1672-5220.202406011
China Classification Code:TH113.1
Citation Information:
[1]SUN Zhihong,DENG Qicai,QU Zhiyang et al.Dynamic Characteristic Analysis and Structural Optimization of Entire Double-Shaft-Driven Needle Punching Machine for C/C Crucible Preforms[J].Journal of Donghua University (English Edition),2025,42(04):399-408.DOI:10.19884/j.1672-5220.202406011.
Fund Information:
Open Project of Shanghai Key Laboratory of Lightweight Composite,China (No.2232021A4-04)