Giunsa pagproseso ang PMI foam

1. Molding process

The molding process is characterized by relatively high mold cost, and the advantage is that the thickness and size of the PMI foam composite material can be accurately guaranteed. At the same time, there are two components with smooth surfaces. The components that usually use the molding process include flight control components, helicopter rotors, and motion components. equipment and medical bed boards, etc. In the molding process, by giving the foam core a certain amount of interference, the interference provides a back pressure for the curing of the panel during the mold clamping and curing process.

Ang compression creep resistance sa PMI foam mao ang pasiuna ug garantiya alang sa gidaghanon sa interference nga ma-convert ngadto sa back pressure. Pinaagi sa pagbutang sa usa ka angay nga kantidad sa interference, ang likod nga presyur mahimong adjust sumala sa resin sulod sa laminate, ang curing system, ug ang gibag-on sa panel. , aron matubag ang mga kinahanglanon sa presyur sa pag-ayo.

2. Autoclave process

The autoclave process is characterized by a hard mold on one side and a soft mold (vacuum bag) on the other side. The curing composite laminate is pressurized by evacuation and pressurization in the autoclave. If the co-curing process is adopted, that is, the curing of the carbon fiber conformal material panel and the bonding of the sandwich structure core material and the panel are completed at one time. The gap of PMI foam is smaller than that of honeycomb, which can provide sufficient support for the curing of the panel, and will not have the telegraph effect like the honeycomb structure panel.

3. Proseso sa RTM

Liquid resin injection is a relatively new optimized manufacturing process. With the help of RTM (Resin Transfer Injection Molding) technology, high-performance sandwich structural components are produced. At present, it is to simplify the production process, reduce manufacturing costs, save the price of raw materials, and select the price. Relatively low cloth with good laying properties can achieve mass production, and the components can use high-quality prepreg.

If the voids of the honeycomb are sealed so that the low-viscosity injection resin does not flow into the voids of the honeycomb, the honeycomb can also be selected as the sandwich material in the RTM manufacturing process. However, if the RTM process is used to produce the sandwich structure conforming material, the foam core material is generally used, and the core material also needs to have good compression creep resistance, which is the same as the autoclave process, and meets the requirements of resin injection pressure and injection temperature.