数字化制造技术在液体火箭发动机导管定制化加工中的应用

Application of digital manufacturing technology in customized processing of liquid rocket engine pipeline

针对液体火箭发动机导管定制化生产的特点,通过构建发动机参数化模型并依据现场实际测量数据进行参数化驱动,基于该模型开展以导管端面与其轴线垂直度、导管对接错位值等偏差最小为约束条件的导管虚拟装配和加工余量计算方法研究,确定最优导管加工方案,用虚拟环境中与现场实物状态一致的三维模型进行装配仿真代替目前在物理环境中采用的实物比对确定加工余量的方式,显著提高液体火箭发动机导管加工效率和一致性。应用该技术生产的导管,单根加工时间不超过15 min,一次装配合格率达到90以上。

According to the characteristics of customized production for liquid rocket engine pipelines,a parametric model of engine is constructed and the parametric drive is carried out according to the actual measurement data on site.Based on this model,the pipeline virtual assembly and the calculation method of machining allowance are studied with the minimum deviation between the pipeline end face and its axis perpendicularity and the misalignment value of pipeline butt as the constraints,and the optimal pipeline processing scheme is determined.Using the 3D model that is consistent with the physical state on-site to perform assembly simulation instead of the physical comparison currently used in the physical environment to determine the machining allowance,the processing efficiency and consistency of the liquid rocket engine pipeline can be significantly improved.The processing time of a single pipe produced by this technology is no more than 15 min,and the qualification rate of one-time assembly is more than 90.