Optimize Preform Process For The Fiber Reinforced Polymer Composites And Design Of Preformer

Fiber reinforced polymer(FRP)composites have been widely used in automotive body lightweight for its excellent mechanical properties and high cost performance ratio.High pressure resin transfer molding(HP-RTM)has become the research focus of automotive structural parts forming technology for its high molding efficiency and good quality.The preforming process is of great importance in ensuring the quality of RTM molded parts,and the blank holder force during the preforming can reduce the extent of preform defects such as wrinkles.This paper will conduct research on the innovative aspects of preforming process and devices,improve design for the blank holder device,to explore how to control FRP composites preform defects.Besides,design the supporting preforming equipment to reduce the defects of the preformed parts and improve the quality of the parts.Detailed contents are listed as follows:(1)Classification of FRP composites by reinforced materials and analysis of their preparation process.Comparing the characteristics of hand lay-up,pultrusion,and RTM molding processes,as well as the applicable range of stitching,injection,heat-molding,and hot-press preforming processes,and according to the hot-press preforming defect mechanism,with the effect of the blank holder force during the forming process,a follow-up zone blanking preforming process consisting of hand-clamping devices was optimized.(2)According to the optimized preforming process,the follow-up zone blanking preforming experimental device composed of hand-clamping devices is refined,and the details of the conventional preformer are improved,these are designed to form a complete set of preforming devices.Next,loading loads and constraints on boundary conditions correctly,static analysis of the frame of the preformer,to make which meet the stiffness and strength requirements.(3)Analyze the motion law,working cycle time and work cycle diagram of the preformer,compare the embedded servo control systems of semi-closed-loop and the full-closed-loop,and build an embedded servo structure with the semi-closed-loop servo control system,and design both pneumatic and electronic control system of preformer for the FRP composites.