Carbon fiber has obvious advantages over other traditional materials, such as high specific modulus and strength, good mechanical properties of manufactured components, high designability and safety, and integration of parts, and the development of a variety of processing and molding processes, which have a wide range of applications in the automotive field. This article introduces the carbon fiber composite materials used to make carbon fiber molds in the automotive field, as well as the advantages of carbon fiber composites in the automotive field compared to traditional materials, if you are interested in this, then read on.
Carbon fiber composite molding process in the automotive field
PCM molding is a molding method in which carbon fiber semi-finished products are pre-pressed into a mold and then heated and pressurized to form and cure. In recent years, prepreg has been more and more widely used because of its precise fiber and resin ratio. The PCM molding process, as an ideal CFRP hot pressing process outside the can, not only can significantly shorten the molding cycle and improve the production efficiency, but also has the characteristics of high dimensional accuracy, good surface finish, relatively low production cost, and easy to realize the complex structural parts in one time, etc. At the same time, due to the good fiber orientation in the products, the strength and stiffness of the products are relatively high, so it has become an important molding process for automotive CFRP. It has become an important molding process for automotive CFRP.
High pressure RTM mould
High pressure rtm (HP-RTM) is an effective method to increase the injection speed by increasing the injection pressure. With this process, the injection pressure can reach several gigapascals, which ensures a high closing speed and pressing speed, greatly reducing the molding time of the part and improving the process efficiency. At the same time, increasing the pressure can promote the resin to fill the mold cavity quickly, improve the fiber resin infiltration, reduce the number of resin injections, promote air discharge, and reduce the porosity of the finished product, thus achieving excellent surface properties. The injection speed can be further increased by choosing to inject low viscosity resin system or low viscosity reactive mixture system at the same time; the injection time can also be shortened by precise metering of reactive materials through high pressure metering technology.
In addition, due to the designability of the structure and properties of CFRP products, the advantages of HP-RTM are even more obvious when applied to the manufacture of large and complex structural parts.
Other molding processes
RTM molding process requires high precision for mold manufacturing, long mold production cycle and high price, while the material processing and transportation cost of prepreg is high, and the cost of mold is not low, so these 2 molding processes have large initial investment. Therefore, other composite molding processes, such as Sheet Molding Compound (SMC) molding process, Long carbon Fiber Reinforced Thennolplastics (CF-LFT) injection molding process has also been Long carbon fiber reinforced thermoplastics (CF-LFT) injection molding process is also widely used.
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