Study On Real-Time Monitoring Of Vacuum-Assisted Resin Transfer Molding

Liquid composite molding technology (Liquid Composite Molding, referred to LCM) is a preparation of products which filled liquid polymer into a closed cavity covered with fiber preform, or melt the resin film in the mold cavity, the liquid polymer completed resin/fiber infiltration and curing while flowing and filling the cavity. Resin rheological properties, preform Overlay, the pressure of inside and outside the cavity will all affect the homogeneity of resin and the curing process. The defects of LCM technology,which often caused fatal damage to the product,is difficult to predict, so the real-time monitoring of LCM technology is the key to improve quality and reduce manufacturing cost.Permeability is a physical parameters of the flow resistance of resin in fabric or reinforcements. It can be used to characterize the ease of resin flowing over porous media or glass fiber fabric. It is a function of porosity. In RTM mold filling process, the accurate description of the permeability of resin in the reinforcements is critical to optimize inlet and exhaust port in injection mold design, shorten the manufacturing cycle,ensure product quality. Therefore, depth study of permeability in the process of resin filling the of the fiber, to understand its influence factors, and be able to design, control of these factors, will be a tremendous impetus to the industrialization of RTM.Blades are the key components in wind power generation system. It has a direct impact on overall system performance, requires a long life in the natural outdoor weathering environmental conditions and reasonable price. Therefore, the design and quality of the blade is very important. RTM process is of high technology. Mold design and manufacturing, and the design and placement of reinforcements, the choice of resin type and modification, process parameters (such as injection pressure, temperature, resin viscosity, etc.) will all affect the shape and quality of products produced.In order to monitor RTM molding process, the subject application use PCI 9112 data acquisition card GIE62 body image acquisition card and PC hardware platform as the basis,Labview for software language,developed by a real-time monitoring system. The system has SmartWave wire, pressure sensors, network cameras for a variety of measurements for different experimental parameters.Compared with similar systems, it has high precision, scalable, and connection piece arrangement, the data read and write speed, simple user interface software.To verify the reliability of the system, the subject studied the permeability measurement methods, get measurement formula from Darcy's law.Two or more method were used to penetration of flat-panel one-way experiment, the radial penetration of flat-panel test, the results of the two methods are highly consistent. In addition, the detection system, is used to monitor turbine blades forming process, in the actual production process, to get recommendations on adjustment of process parameters.