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lowfoam
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Oprettet 2. August 2021 kl. 03:14
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The sandwich structure co-curing process is adopted to reduce the cost

Foam-filled ribs are the latest applications in the rear pressure frame structure of Airbus A340 and A340-600. So far, nearly 1,700 ROHACELL® 71 WF-HT thermoformed and processed by CNC have been delivered to the Airbus Stade plant near Hamburg for use by A340. During the layup and curing process, the formed foam acts as a core mold.

During curing, PMI foam has good compression creep resistance and dimensional stability, so that under the curing conditions of temperature 180oC, pressure 0.35MPa, and 2 hours, the sandwich structure co-curing process is adopted to reduce the cost. PMI foam can ensure that the prepreg around the ribs is completely compacted, which can be a good replacement for the inflatable airbag tooling, avoiding a series of problems such as the use of inflatable airbags that require multiple curing.

So far, more than 170 rear pressure frames have been successfully manufactured, and there is no waste product. This also proves the reliability and feasibility of the PMI foam reinforcement strip process. Based on the success of the new A340 rear pressure frame using theChina Radom foam PMI foam-filled rib structure, the A380 rear pressure frame also uses this technology. In the A380 structure, the foam ribs are 2.5m long and the geometry is relatively more complicated. PMI foam processing and thermoforming are easier, which is also the key to the realization of foam filling rib design. At present, 200 pieces of processed foam ribs have been delivered to the Airbus Stade plant for AIRBUS A 380 use.

Core material foam, core material foam filling, high temperature resistant foam which is better PMI foam has been successfully used as the core material of sandwich structure foam in various aircraft structures. The difference between PVC foam and EPS foam is used.



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