Roll Wrapped Carbon Fiber Tube

Wound prepreg roll wrapped carbon fiber tube:

A wound prepreg carbon fiber tube is made by winding twill carbon fiber prepreg or unidirectional prepreg layer by layer on a metal mandrel and then curing it at high temperature. In this process, the quality control of the tube is carried out in two aspects: first, to ensure that the size of the metal mandrel is accurate and appropriate, because the carbon fiber prepreg is wound on the outside of the mandrel, and the outer diameter of the mandrel itself needs to match the inner diameter of the carbon fiber tube it manufactures; second, the layering scheme of the wound carbon fiber composite material prepreg is carefully designed. The number and thickness of the carbon fiber prepreg wound on the mandrel determines the outer diameter of the carbon fiber tube. The fibers of the woven carbon fiber prepreg are oriented at the 0° axis (down the length of the tube) and the 90° axis (around the circumference of the tube). These layers add the so-called hoop strength to the tube, making it less susceptible to extrusion or bursting forces, while the unidirectional prepreg on the 0° axis can mainly improve the longitudinal stiffness of the tube.

Carbon fiber tube rolling process:

The rolling process of carbon fiber round tubes must first cut the prepreg according to the size specifications of the roll wrapped carbon fiber tube, and then customize the mold and select the layering process according to the force direction, performance requirements, tolerance range, and other factors of the carbon fiber round tube. Generally, the core mold for rolling will choose solid steel bars, and the layering direction is generally selected at 0°, ±45°, and 90°. After the layering is completed, pre-compacting is required. This step can reduce defects such as stratification and bulging caused by air.

The steps are quite simple:
First, heat the carbon fiber prepreg to soften it, then stick one side to the core tube of the mold, and then use the tube rolling machine to make the roller roll the carbon fiber prepreg onto the core tube with the help of friction when it is running. After each roll, it is necessary to ensure that a full circle of rolls is completed, to better ensure that the performance of the finished carbon fiber tube is better and not easy to delaminate. After the roll is completed, to ensure that it is not easy to disperse during curing, it is necessary to wrap the OPPO film, so that it can be sent to the curing furnace for tube curing. After curing, it is molded to obtain a carbon fiber round tube.

There are two types of roll wrapped carbon fiber tube rolling processes: the manual cloth method and the continuous mechanical method. The basic process is: first clean each roller, then heat the hot roller to the set temperature, and adjust the tape tension. Without applying pressure from the roller, wrap the guide cloth around the tube core mold coated with a release agent for about one turn, then lower the roller, stick the guide cloth on the hot roller, and pull the adhesive tape over it, covering the heated part of the guide cloth and overlapping it.

The length of the guide cloth is about 800-1200mm, depending on the tube diameter. The overlap length between the guide cloth and the adhesive tape is generally 150-250mm. When rolling thick-walled pipes, the rotation speed of the core mold can be appropriately increased after the rolling is normal, and the speed can be slowed down when it is close to the designed wall thickness. When the designed thickness is reached, the adhesive tape is cut off. Then, while maintaining the pressure of the roller, continue to rotate the core mold for 1-2 turns. Finally, lift the roller and measure the outer diameter of the tube blank. If it is qualified, take it out of the tube rolling machine and send it to the curing furnace for curing and forming.

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