Simulation of micro-droplet injection process and key parameters based on 3 DP equipment of wood-plastic composites
[Objective]Based on the self-developed wood-plastic composite material 3DP equipment micro-droplet injection system,research on the process of UV adhesive micro-droplet injection is aimed to optimize the processing parameters and the structural parameters of the micro-droplet injection system,and provide data support for the study of droplet spreading and infiltration in the 3DP process of wood plastic composite materials.[Method]The displacement characteristics of the needle-type jet valve and the rheological properties of the UV adhesive were analyzed to determine the injection parameters affecting the micro-droplet injection process of the wood plastic composite 3DP processing.The finite element method was used to simulate the micro-droplet injection process to analyze the influence of injection parameters and obtain the variation characteristics of droplet velocity,pressure and mass flow rate at the nozzle during the micro-droplet injection process.The needle velocity,nozzle diameter and UV adhesive supply pressure as evaluation factors,and the mass of the droplet and the main droplet velocity as evaluation indicators,simulation experiments were conducted to optimize parameter combination.[Result]The results of the single factor experiment indicated that needle speed 0.3-0.9 m·s-1,nozzle diameter 0.10-0.20 mm,UV adhesive supply pressure 0.1-0.3 MPa were reasonable printing parameters.The results of the orthogonal experiment indicated that nozzle diameter is a significant factor of droplet mass,and the UV adhesive supply pressure is a significant factor of the droplet velocity.The droplet mass and droplet velocity are optimal when the nozzle diameter is 0.10 mm,the needle speed is 0.9 m·s-1,the UV adhesive supply pressure is 0.1 MPa,and the valve seat cone angle is 130°.[Conclusion]The VOF finite element model of 3DP micro-droplet injection process of wood-plastic composite was established on the basis of pre-experiment and theoretical analysis.The study on the influence of injection parameters on micro-droplet injection has been completed,and the optimal combination of injection parameters has been obtained.[Ch,8 fig.4 tab.17 ref.]
wood-plastic compositethree-dimensional printing and adhesiveneedle-type jet valveUV adhesiveinjection parameters
万方数据
维普
