基于响应曲面法的四孔棒材精密挤出成型模具优化OA

Precision extrusion technology for porous rods is in high demand in advanced fields such as medical,chemical and electronics industries.However,research on optimization methods for the corresponding mold structure remains relatively limited.The coupling effects of multiple parameters are often overlooked and existing studies primarily focus on single-phase polymers,while research on high-solid-content and high-viscosity blend melts is notably lacking.To address this,the four-hole rods were selected as the specific research object.Numerical simulation methods were employed to analyze the flow behavior of the melt inside the mold during the rod forming process and identify the main factors affecting forming precision.Based on the established rheological constitutive equation for high-solid-content and high-viscosity blend melts,the influence of inlet structure and inlet pressure on the pressure and velocity of the material during extrusion was investigated.The impact of process parameters on the extrusion swell ratio of the product was then analyzed and a single-factor mathematical model was established to relate process parameters to product precision fluctuation.Finally,response surface methodology(RSM)was used to analyze the coupling effects of multiple factors including inlet pressure,mold length-to-diameter ratio and mold contraction angle on the stability of porous rod extrusion.It was found that while ensuring extrusion safety,a higher inlet pressure,wider mold contraction angle and lower length-to-diameter ratio contributed to reducing extrusion swell and improving product quality.In a specific scenario,the optimized parameters for a four-hole extrusion mold were determined as follows:inlet pressure of 8.443MPa,mold length-to-diameter ratio of 4.5 and contraction angle of 96.197°.