| 摘要 |
The invention relates to a sandwich structure reinforcement by means of a reinforcement device. The sandwich structure covering layers can be mainly made of a composite (FKV) and a polymer rigid foam core material. The reinforcement is carried out by a gripper, which pierces the sandwich structure or the core material, only (see figure: first stage) at one side, thereby obtaining a hole penetrating through the polymer rigid foam (see figure: second stage). At the opposite side, said gripper catches the reinforcing structure ( for example a sewing thread, pultruded fibre-plastic composite rods) (see figure: second stage) and inserts the reinforcing structure into the sandwich structure during the back movement thereof (see figure: third stage). The through hole is additionally enlargeable by the reinforcing structure, thereby making it possible to obtain an important fibre volume part in the though hole of the core material. Contrary to conventional sewing processes, it makes it possible to influence the hole passing through the core material mainly with the reinforcing structure. After the reinforcing process, the sandwich structure is impregnated with a duromer or thermoplastic matrix material by a liquid composite moulding method. The impregnated sewing threads are embodied in the core material in the form of highly rigid and solid unidirectional FKV-elements which reinforce the core material and the entire sandwich structure. |
