What are the steps of resin vacuum for carbon fiber auto parts
In fact, there is not much difference between the requirements of vacuum and hand lay up mold for most of the FRP shell formed by vacuum bag. However, the flange of the vacuum mold is relatively larger (such as 15cm), which is to facilitate the butyl tape to bond and seal the vacuum bag.
Vacuum operation steps
The first step: clean the surface of the FRP mold and apply the release agent; first, glue the sealing tape to the flange edge of the mold, so as to consider: 1. The flange edge of the mold is large enough, and the subsequent operation will not hinder. 2. Avoid scattered carbon fiber debris, which may cause air leakage when sealing at flange edge.
Step 2: cutting carbon fiber cloth
Carbon fiber cloth should not be cut too small, and the rough edges that need to be cut in the later period should be fully considered. You can also cut the carbon fiber cloth in advance. If the calculation is not good, you can cut one first, try to lay it, and then cut it according to the size.
Carbon fiber cloth cutting step 3: laying carbon fiber cloth
As for the laying of multi-layer carbon fiber cloth, you can use the setting spray glue, which is easy to bond and lay to the mold surface. Don't spray too much, because it shows the potential risk of poor combination.
Step 4: lay release cloth
The demoulding cloth will not stick to the product. After the part is solidified, it can be easily torn off, and the woven texture imprint similar to cloth pattern is formed on the back of the product.
Lay the release cloth step 5: lay the guide net
The primary function of the guide net is to promote the activity of the resin and disperse the epoxy resin quickly and effectively in the whole product layer.
Step 6: lay spiral pipe and place rubber inlet and outlet
The spiral pipe of resin injection seat is the transportation and dispersion channel of resin. Because it is spiral and open, when the resin moves in one direction, it will quickly disperse to the flow guide net and the whole carbon fiber cloth layer.
Placement of resin guide pipe step 7: lay and stick the vacuum bag film
Due to the simple structure and long gelation time of epoxy resin, it is not necessary to worry about the additional consideration of resin diversion. Find a symmetrical position at will and place a rubber inlet and outlet separately. The vacuum bag should be cut larger and sealed carefully to avoid bridging and piercing the vacuum bag. Vacuum! Air tightness is the first priority.
Step 8: connect vacuum pump and resin collector with vacuum tube
When the PVC hose is used to connect the vacuum equipment and the resin collector, it can be cut into an oblique angle, so that the hose can be pushed into the vacuum nozzle in the vacuum bag, and then sealed with butyl tape.
The resin collector should pay attention to these directions. It is very simple that the slight air leakage may be caused by not pressing the sealing tape with force.
Vacuum pump step 9: vacuum leakage test
Test the vacuum tightness of half of the hose to confirm whether it meets the requirements of resin vacuum pumping.
The leakage point of PVC vacuum pipe should be found carefully, the deviation should be corrected and the sealing should be done again. Once the vacuum degree reaches the requirements of the parts, the subsequent operation can be carried out.
Vacuum test step 10: weigh and mix epoxy resin and curing agent correctly
For epoxy resin configuration, it is necessary to measure the epoxy resin and curing agent accurately and mix them evenly, otherwise the product may become soft or the resin is always sticky.
Eleven steps of vacuum epoxy resin introduction
Because the structure of this part is relatively simple, the vacuum epoxy resin diversion speed will be very fast, and the visual inspection of this small part is generally 15-20 minutes enough for the diversion to be completed.
carbon fibre
Introduction of vacuum resin 12 steps: waiting for epoxy resin curing and removing auxiliary materials
After the diversion of epoxy resin, the inlet and outlet can be cut off, waiting for the epoxy resin to be cured completely; generally, the curing can be completed by heating 60-80 ℃ for 3 hours. Curing at room temperature takes more than 24 hours. After curing, demoulding and stripping vacuum auxiliary materials.
13 steps of carbon fiber parts demoulding: cutting parts, cutting and polishing
After carbon fiber parts are cut, sandpaper and water grinding are recommended for polishing, while dry grinding is not recommended because the grinding dust is pressed into the pinholes on the surface, which will be removed easily.
14 steps of cutting carbon fiber shell: repair pinholes on the surface of carbon fiber parts
It is difficult to completely eliminate the pinholes on the surface of epoxy resin parts. Because of the interlacing point of carbon fiber cloth, twill cloth is better than plain cloth.
Car carbon fiber on the surface of parts pinhole treatment, you can use epoxy resin filling or spray 2K varnish for plugging. Varnish anti ultraviolet effect will be better, but the strength is not as high as epoxy resin, which is more suitable for you, according to the actual situation to weigh it.
Carbon fiber car parts shell here, a brief carbon fiber car parts shell fundamental vacuum manufacturing completed. Of course, not all the vacuum parts are operated in the same way. Due to the differences in the structure of the parts and the actual requirements, the specific operation is slightly different, but the basic routine is almost the same.
