The carbon fiber wound tube needs to tightly roll the prepreg on the core mold, and the core mold itself needs to have good rigidity and will not be deformed during the rolling process. The materials used to make the core mold are plaster, glass fiber reinforced plastic, wax, metal, etc., and the hardness and rigidity of metal materials are better, which can keep the carbon fiber prepreg pressed tighter when rolled.
In addition, the surface of the metal material has a better finish after being polished. After applying the release agent, the release can be ensured to be more complete without damaging the inner wall of the carbon fiber tube.
Another important advantage is that the metal core mold is less difficult to create and the cost is not high. It can be reused many times in the future, and the overall cost-effectiveness is higher.
It should be noted that the design of the metal core die head of the carbon fiber winding pipe needs to be based on the spiral winding law, and an oblate elliptical spherical head can be used. In the case of the barrel, theoretically the product needs to be processed according to the diameter, which requires the barrel of the core mold to be processed in the same diameter, but in fact, the processing method of the tapered core mold is used. After repeated trials, it is more appropriate to process the core mold barrel with a taper of 1:1500~3500. Taking into account the need for mold release, apply a mold release agent on the surface of the core mold. Regarding the auxiliary part, since the core mold needs to be installed on the winding machine, the core mold hole must extend a certain length outward.
Don’t underestimate the mandrel. Without it, the carbon fiber wound tube cannot reach the desired size and specifications. It means that the first step of making carbon fiber tube is not completed. It is also impossible to make a carbon fiber tube that meets the standard.
