基于药料膨胀和流动均匀性的单孔药模具设计

为分析模具结构参数对发射药成型尺寸及出口速度均匀性的影响规律,基于正交优化方法,采用POLYFLOW软件对单孔硝基胍发射药的挤出成型过程进行了模拟仿真。分析了入口线速度恒定条件下模具结构参数对发射药成型尺寸及出口速度均匀性影响程度的主次关系,在此基础上优化了单孔发射药挤出模具结构。研究结果显示:对药料成型膨胀影响最大的因素为模具收缩角,其次为成型段长度,再次为压缩段长度; 对出口速度分布均匀性影响最大的因素为模具收缩角,其次为压缩段长度,再次为成型段长度。基于最小膨胀率和最小出口速度极差对模具结构参数进行了优化,结果表明,优化后的药料出口速度均匀性得到提高。

Design on Die of One-hole Propellant Based on Its Expansionand Flow Uniformity

In order to analyze the effects of die structure parameters on the propellant molding size and the uniformity of velocity,the extrusion process of single-hole propellant was simulated by POLYFLOW based on orthogonal optimization method.By setting the inlet velocity as constant,the primary and secondary factors affected by die structure parameters were distinguished.On this basis,the die structure of one-hole propellant was optimized.The result shows that the mold shrinkage angle is the biggest effect factor on the expansion rate,secondly the length of forming section,thirdly the length of compression section.The mold shrinkage angle is the biggest effect factor on the uniformity of velocity,secondly the length of compression section,thirdly the length of forming section.Based on the minimum of expansion rate and velocity range,the die structure parameters were optimized.The optimized uniformity of velocity improves.