Method for using open-type rubber soft die for realization of thin-wall I-beam structure composite material part

Abstract

The present invention discloses a method for using an open-type rubber soft die for realization of a thin-wall I-beam structure composite material part, by a machine manufacturing method, a metal false part with a boundary dimension which is entirely consistent with the boundary dimension of the composite material part is processed, a rubber soft die molding mold with a baffle is also processed, a rubber soft die is paved and pasted in a cavity formed by the metal false part and upper and lower templates, the external part of the rubber soft die is vacuum-sealed with a vacuum bag, and the rubber soft die is molded in a hot-pressing tank; after the rubber soft die is molded, the vacuum bag is removed, the metal false part is taken out, and filled with a composite material, then the external part of the rubber soft die is vacuum-sealed with the vacuum bag, and thee rubber soft die is molded in the hot-pressing tank to obtain the I-beam structure composite material part. The method can avoid the thickness over-deviation phenomenon of the composite material part, avoids the thermal hysteresis phenomenon, effectively guarantees the molding quality of the part, and improves the passing rate and efficiency of production.

Description

technical field [0001] The invention belongs to the technical field of composite material manufacturing, and in particular relates to a method for manufacturing high-performance carbon fiber composite structural parts in the industry of aircraft, spacecraft and automobiles. Background technique [0002] Resin-based carbon fiber composite materials have superior properties such as specific strength and specific stiffness, strong designability, good fatigue fracture resistance, corrosion resistance, and good dimensional stability. They are currently widely used in aviation, aerospace, transportation and other fields. High-performance structural materials. Among various carbon fiber composite molding processes, the autoclave process has uniform molding temperature and pressure, and has good adaptability to parts of different materials, shapes, sizes and structures. One of the main process methods of material components. [0003] Thin-walled I-beams are relatively common reinf...

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Problems solved by technology

[0007] The disadvantages of using the mandrel method to form I-beams mainly include the following three aspects: 1. Because the mandrel itself has a certain rigidity, it is difficult to achieve uniform and accurate conduction of external pressure through the mandrel, and it is easy to cause the thickness of thin-walled composite parts. 2. Since the core mold has a certain thickness and the thickness is not uniform, according to the heat transfer effect, the heating rate of different regions of the part will be different, which will affect the internal molding quality of the part, resulting in Large deformation; 3. Since the mandrel is made of metal, it has a large weight and is very inconvenient to operate

At the same time, the manufacturing and maintenance costs of the metal mandrel are relatively high, and the manufacturing cycle for repair or reprocessing is relatively long

[0008] While using the airbag method to form the I-beam, although it can ensure the uniform transfer of external pressure and heat, the manufacturing process of the airbag itself is relatively complicated, and the airbag is prone to cracking or damage near the air nozzle, and the manufacturing success rate is low; Airbags have strict airtightness requirements, and once an air leak occurs, it is usually impossible to repair, which leads to a reduction in the service life and reliability of the airbag, which is especially evident in the molding process of large-scale composite parts

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