Factors affecting the surface quality of carbon fiber composite molded products
Analysis of influencing factors
1. Raw material selection The raw material quality of epoxy resin and carbon fiber has a direct impact on the surface quality of molded products. The viscosity, curing speed, cross-linking density and other characteristics of epoxy resin, as well as the purity, length, diameter and distribution uniformity of carbon fiber, will affect the wettability, curing effect and surface smoothness of the composite material.
2. Molding process parameters The influence of process parameters such as molding temperature, pressure and time on the surface quality of products cannot be ignored. Too high temperature may cause excessive curing of resin, resulting in cracks or surface roughness; too low temperature may cause incomplete curing of resin, affecting the strength of products. At the same time, appropriate pressure helps the resin to fully infiltrate carbon fibers and improve the density and surface flatness of products.
3. Mold design and manufacturing The design and material selection of molds are also crucial to the surface quality of products. The cavity size, shape accuracy, surface roughness and demolding slope of the mold will affect the molding effect and demolding difficulty of the product. In addition, the thermal conductivity, wear resistance and corrosion resistance of the mold material will also affect the surface quality of the product.
4. Environmental factors Humidity, temperature and dust in the production environment will also affect the surface quality of the product. Excessive humidity may cause the resin to absorb water and affect the curing effect; too high or too low temperature may affect the fluidity and curing speed of the resin. Dust and other impurities may adhere to the surface of the product and form defects.
Improvement method
1. Raw materials Select epoxy resin with moderate viscosity, controllable curing speed, high cross-linking density, and high purity, uniform length, and moderate diameter carbon fiber, which will help improve the surface quality of the product.
2. Accurately control the molding process parameters Through experiments and simulations, determine the optimal molding temperature, pressure, time and other process parameters to ensure that the resin is fully cured and the product surface is smooth.
3. Improve mold design and manufacturing Optimize the mold cavity size, shape accuracy and surface roughness of the mold, improve the thermal conductivity and wear resistance of the mold, so as to reduce the molding difficulty and demolding resistance of the product.
4. Improve the production environment Control the humidity, temperature, dust and other impurities in the production environment to ensure that the product is molded under good environmental conditions.
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