High temperature molding, vacuum bag molding, resin transfer molding, extrusion molding, and hot pressing can molding are commonly used molding methods for carbon fiber composite components.
For the molding of large quantities of components, the molding and hot curing process is a more suitable preparation method. On the one hand, this process is faster than traditional molding methods such as hot pressing cans, which can reduce manufacturing costs to a certain extent; On the other hand, the molding and hot curing process is conducive to ensuring the standardized quality of components, and has good performance in integrated molding and product details.
In fact, the curing process parameters have a significant impact on the performance of carbon fiber composite components. Because during the thermal curing process, the flow overflow of the resin matrix is closely related to the initial pressure and heating method.
The initial pressure has a direct effect on the resin overflow amount. As the initial pressure increases, the elastic modulus and axial compressive strength of the carbon fiber component preform both increase. However, due to the large amount of resin overflow directly affecting the matrix content between carbon fibers, the axial tensile strength will actually decrease.
Excessive initial pressure can cause a large amount of resin to overflow, increasing the gaps between carbon fiber bundles, which is not conducive to ensuring the thickness of the finished parts and the comprehensive performance of the parts. In addition, Zhishang New Materials also found that compared to directly heating up to the curing temperature, the stepped heating method is more conducive to reducing resin overflow during the curing process and has a positive effect on improving the performance of components.
Based on the above conclusions, when using high-temperature molding to produce carbon fiber components, the initial step pressure increase and step temperature increase methods are used to improve the bonding strength between carbon fiber and resin while ensuring resin curing, resulting in a significant increase in the tensile strength of the finished components.
The specific temperature setting and heating time point require multiple experiments and comparisons to form the final optimal solution. Moreover, these plans are only applicable to the production of a specific carbon fiber component. Once the plan achieves good results, it can be implemented for mass production of that component.
By adjusting the curing temperature, heating method, initial pressure and other process parameters of specific components, details such as material thickness, resin curing degree, and fiber resin bonding force during component molding are controlled, thereby regulating the comprehensive mechanical properties of the finished product
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