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Preparation method of "J" type stiffened wall panel tackified preforms suitable for RFI technology

A technology for reinforced wall panels and preforms, which is applied in the field of preform preparation for improving the quality of composite "J" type reinforced wall panels, can solve problems such as poor performance and weak impact damage resistance, and reduce processing Difficulty, avoid deformation, easy to detect the effect

Active Publication Date: 2020-05-19
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Considering the shortcomings of traditional two-dimensional composite materials such as poor interlayer performance and weak impact damage resistance, more and more reinforced wall panel structures require integral molding by stitching / RFI process

Method used

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  • Preparation method of "J" type stiffened wall panel tackified preforms suitable for RFI technology
  • Preparation method of "J" type stiffened wall panel tackified preforms suitable for RFI technology
  • Preparation method of "J" type stiffened wall panel tackified preforms suitable for RFI technology

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preparation example Construction

[0054] A method for preparing a "J" type reinforced wall panel preform suitable for RFI process, comprising:

[0055] (a) Decompose the "J" type reinforced wall plate according to the structural characteristics, and divide the "J" type long stringer ply unit according to the process separation surface.

[0056] (b) Design of preforming die for “J”-shaped trusses.

[0057] (c) "J" shaped stringer and skin unit preformed.

[0058] (d) Assemble the "J"-shaped stringer, the skin unit and the forming mold, pre-press and shape, and position to form a pre-formed "J"-shaped reinforced wall panel preform.

[0059] (e) The pre-formed "J"-shaped reinforced wall panel preform is sewed and trimmed to prepare a "J"-shaped reinforced wall panel preform.

[0060] In step (a), the "J"-shaped reinforced panel unit is divided into two parts: a "J"-shaped stringer and a skin according to structural features. "J" type long stringer layup is divided into "C" type layup unit 5, "Z" type layup uni...

Embodiment 1

[0088] Example 1: A "J"-shaped reinforced wall panel, with a size of 2.0m×0.8m, has 6 "J"-shaped long stringers of the same length as the skin, and 6 long stringers have a fracture in the middle. The height of the truss is 45mm, the width of the upper and lower flanges is 20mm, and the radius of the corner between the web and the upper and lower flanges is 4mm. The thickness of the single layer of woven fabric used is 0.2mm, the skin has 16 layers of fiber woven fabric, the thickness is 3.2mm, the "J" type reinforcement has a total of 12 layers, the thickness is 2.4mm, and the inner side of the skin is 12 layers in the flanging area of ​​the long stringer Participate in stitching, the outer 4 layers are not stitched, and are integrally formed through the RFI process. Considering the internal and external profile size, position, and appearance quality requirements of the "J"-shaped truss, this scheme is adopted to prepare the "J"-shaped composite material reinforced wall panel ...

Embodiment 2

[0113] Example 2: A "J"-shaped reinforced wall panel, with a size of 5.0m*0.9m, has 6 "J"-shaped reinforcements, the total length of the girder is 4.2m, the height of the girder is 40mm, and the width of the upper flange is 18mm , the width of the lower flanging on both sides is 25mm, and the r angle radius between the web and the upper and lower flanging is 3mm. The thickness of the single layer of woven fabric used is 0.16mm, the skin has 25 layers of fiber woven fabric with a thickness of 4.0mm, and a total of 12 layers of "J" type reinforcement with a thickness of 1.96mm. The lower flanging area of ​​the "J"-shaped truss is sewn with the skin and formed as a whole through the RFI process. The inner cavity of the "J" type long truss is matched with multiple metal parts, and the fracture and both ends are matched with the beam, which puts forward higher requirements for the size, position and appearance quality of the reinforcement. The "J" type composite material The prepa...

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Abstract

The invention belongs to the technical field of low-cost manufacturing of high-performance resin matrix composite materials, and provides a preparation method of "J" type stiffened wall panel tackified preforms suitable for an RFI technology. The preparation method comprises the steps that (a) a "J" type stiffened wall panel is decomposed according to structural features, and a "J" type long trusslayer unit is divided according to a technology separation surface; (b) a "J" type long truss preforming die is designed; (c) preforming of a "J" type long truss and a skin unit is carried out; (d) assembling, prepressing for shaping and positioning of the "J" type long truss, the skin unit and a forming mould form presetting type J" type stiffened wall panel tackified preforms; and (e) the presetting type "J" type stiffened wall panel tackified preforms are sewed and trimmed to prepare the "J" type stiffened wall panel tackified preforms. According to the preparation method of the "J" type stiffened wall panel tackified preforms suitable for the RFI technology, the final quality of the stiffened wall panel can be better guaranteed by controlling the accuracy of a profile and a position of the long truss in a preforming preparation process.

Description

technical field [0001] The invention belongs to the technical field of low-cost manufacturing of high-performance resin-based composite materials, and relates to a method for preparing a preform suitable for an RFI process and capable of improving the quality of a "J"-shaped reinforced wall plate of composite materials. Background technique [0002] Considering the shortcomings of traditional two-dimensional composite materials such as poor interlayer performance and weak impact damage resistance, more and more reinforced wall panel structures require the use of stitching / RFI processes for integral molding. That is to use dry woven fabrics to prepare dry fiber preforms, combine the sewing technology to sew the skin or the reinforcement and the skin, and use the RFI (Resin Film Infusion) process to infiltrate the resin into the dry fibers during the heating process, and the temperature rises Solidified and formed to obtain the whole part of the reinforced wall panel. Compared...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/44B29C70/54
CPCB29C70/44B29C70/545B29C70/54
Inventor 高艳秋赵龙王海雷
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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