Design And Implementation Of Virtual Simulation Platform For Melt Spinning Screw Extrusion Process

As the main method of chemical fiber spinning,melt spinning has the advantages of short process flow,wide application range,simple equipment,environmental protection and high efficiency.It can be used for spinning and forming of common fibers such as polyester,nylon,polypropylene,etc.In the melt spinning process flow,the melt preparation process has a critical impact on the subsequent spinning output and the quality of the finished product.The use of screw extruder for melt preparation often encounters problems such as poor melt uniformity,high degradation,and raw material blockage,so the control of temperature and pressure is extremely strict.Based on the modeling and simulation of spatial and temporal distribution parameters of melt spinning process,this topic uses virtual reality technology to simulate the screw extrusion process of melt,and develops a simulation platform for melt spinning.The simulation platform can show the three-dimensional animation of the screw extrusion process.The user can observe the change of the melt quality index under different process parameters,and the platform can output the process parameters required for the given expected index.The specific research results are as follows :(1)The production process of melt spinning and the operation principle of screw extrusion process were analyzed.The screw extrusion process was divided into partial filling zone,coupled moving boundary and complete filling zone.The mechanism model was established based on the mass conservation and energy conservation of different regions.In order to facilitate the calculation,coordinate transformation was introduced to transform the moving boundary into a fixed boundary,so as to obtain the mathematical model of the fixed domain system.(2)According to the distributed parameter model of screw extrusion process and boundary conditions,the steady working points of each quality index were solved.In order to accurately control the temperature and pressure of the melt at the outlet,the process parameters such as screw speed and can-body temperatures were calculated by solving the problem step by step.Original system simulation,fixed domain system simulation and process parameter simulation were completed through python language,and the simulation results were analyzed.(3)Design of virtual experimental platform architecture for melt spinning screw extrusion process.First of all,the platform requirements were analyzed from two aspects: technical requirements and business requirements.Then,the overall architecture design and basic function design of the platform were completed for specific requirements,including front-end module function design,back-end module function design and animation module function design.Finally,according to the basic functions of each module,appropriate development technology frameworks were selected.(4)The virtual experimental platform for the extrusion process of melt spinning screw was realized.Based on the business requirements of the virtual simulation platform,the simulation platform was divided into several modules such as registration login,simulation parameters,simulation results,and spinning animation.The front-end and back-end separation development mode was used to achieve modular development.Users can get the change of melt quality index by setting different process parameters,and can also set the expected melt quality index to get the required process parameters.Finally,based on the major mainstream browsers,the functional test and compatibility test of the virtual simulation platform were completed,and the system performance was optimized.