摘要
单螺杆挤压成型过程中,药料易受工艺条件影响而引起自身的降解放热,影响制品质量,存在潜在的安全隐患,因此量化研究挤压过程药料的分解生热量具有重要实际意义。为此,研究采用实验和仿真相结合的方法,自编有限元二次开发子程序对药料挤出加工过程中的热分解现象进行研究。结合药料的热分解动力学模型,建立了药料单螺杆挤出过程模型,提出热-化学耦合方法,计算药料挤出过程的热分解度、温升和进出口间的最大温差,并研究了工艺条件对物料热分解度的影响。用自搭建的物料热分解实验装置验证了提出的热-化学耦合方法可行性。结果表明,螺杆转速10 r·min^(-1)条件下,考虑物料分解放热得到螺杆挤压过程最高温度比不考虑热分解情况高0.91 K,最高压力降低8.2%。物料分解度是物料温升与停留时间共同作用的结果。与增加转速相比,升高机筒温度对物料热分解的影响更显著。
In the process of single screw extrusion molding,the materials are easily affected by process conditions,which leads to self-degradation and heat release,thereby posing potential safety hazards.So quantifying the decomposition heat release of materials during the extrusion process has practical significance.The experimental and simulation methods were combined to investigate the thermal decomposition phenomenon of energetic materials during extrusion process based on the self-developed finite element secondary development subroutine.Combining the thermal decomposition kinetics model of materials,a thermochemical coupling method was proposed to calculate the thermal decomposition degree,temperature rise and the maximum temperature difference between inlet and outlet of energetic materials during extrusion.The influence of process conditions on the thermal decomposition degree of materials was also examined.Additionally,a material thermal decomposition experimental apparatus was built to validate the feasibility of the proposed thermal-chemical coupling method.The results show that under the condition of a screw speed of 10 r·min^(-1),compared with ignoring material thermal decomposition,the highest temperature during the screw extrusion process considering the decomposition heat release of materials increased by 0.91 K,and the highest pressure decreased by 8.2%.The decomposition degree of materials is the combined effect of material temperature increase and residence time.Compared to increasing the rotational speed,raising the temperature of barrel presents a greater effect on the thermal decomposition of materials.
作者
严瑞晨
何红
邢宇
王荣鑫
赵承志
YAN Rui-chen;HE Hong;XING Yu;WANG Rong-xin;ZHAO Cheng-zhi(School of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)
出处
《含能材料》
北大核心
2025年第11期1300-1312,共13页
Chinese Journal of Energetic Materials
关键词
单螺杆挤压
含能材料
热分解
流变性能
分解度
single screw extrusion
energetic materials
thermal decomposition
rheological behavior
decomposition degree
