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Preparation equipment and method for prefabricated body with bent section

A preform and cross-section technology, applied in the field of resin matrix composite material molding, can solve the problems of deviation of performance value from expected design value, uncontrollable fiber deformation, uncontrollable external force, etc., to improve reliability and stability, reliability and repeatability. Good performance and the effect of reducing material cost

Active Publication Date: 2020-05-29
AVIC BASIC TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, this kind of prefabricated body is prepared by manual laying method, which currently has the following problems: (1) The external force applied by hand is uncontrollable and random, resulting in uncontrollable fiber deformation, prone to fiber buckling, wrinkles, fiber The actual orientation deviates from the theoretical orientation and other defects; (2) The actual orientation of the fiber is difficult to predict, resulting in large dispersion of mechanical properties of the composite material, and the performance value deviates from the expected design value, and even cannot be used under normal conditions; (3) The repetition of component development The reliability is completely dependent on the proficiency of the workers, the reliability is poor, and the scrap rate is high

Method used

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  • Preparation equipment and method for prefabricated body with bent section
  • Preparation equipment and method for prefabricated body with bent section
  • Preparation equipment and method for prefabricated body with bent section

Examples

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preparation example Construction

[0029] The preparation equipment with bent cross-section prefabricated body, the structure of the formed axially curved П-shaped composite material blank is: its cross-sectional shape is П-shaped, and the П-shaped composite material blank is composed of a web and edge strips on both sides Composition, the thickness is δ, the width of the web is b, the width of the outer edge strip is L1, the width of the inner edge strip is L2, and the edge strips on both sides are part of the concentric ring, and the circle of the ring where the inner edge strip is located The arc radius is R, the arc radius of the ring where the outer edge is located is R+b, the R angle between the inner edge and the web is R1, and the R angle between the outer edge and the web is R2.

[0030] The preparation equipment for preforms with bent sections is divided into three areas: area I for feeding and guiding flat belts to rollers, area II for geometric section roll forming, and area III for bending roll form...

Embodiment 1

[0042] Example 1: Preparation of П-shaped beam prefabricated body with CF3031 / EP sizing agent

[0043]In this embodiment, the diameters of the inner and outer edge strips of the П-shaped beam are 2300mm and 2500mm respectively, and the thickness is 3mm. The strip material used is CF3031 fabric laminate, and the sizing agent is EP. Place the CF3031 / EP sizing fabric tape on the reel on the first template with a cross-section of П and extending along a straight line. According to the viscosity temperature test of the EP sizing agent resin, 70-90 ° C is selected as the molding temperature. Set the speed of each outer vertical roller in Zone II to 0.5m / min, set the speed of the vertical rollers outside the inner edge strip in Zone III to 0.54m / min, and set the speed of the vertical rollers outside the outer edge strip in Zone III to 0.5m / min. The speed of the rollers is set to 0.6m / min, and the gap between the vertical roller pairs is adjusted to 3mm. Press the cylinder, turn on t...

Embodiment 2

[0044] Example 2: Preparation of Z-beam prefabricated body with CFF3031 / EP sizing agent

[0045] The difference between this embodiment and Embodiment 1 is that the prefabricated body structure is changed from П-shaped to Z-shaped; The shape and surface are consistent, and other operations are the same as in Example 1, and the Z-shaped prefabricated body is obtained with good quality.

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Abstract

The invention belongs to the technical field of resin-based composite material forming, and relates to preparation equipment and method for a prefabricated body with a bent section. For the laying process of an undevelopable complex curved surface, the external force applied by a hand is uncontrollable and high in randomness, the actual orientation of fibers is difficult to predict, so that the mechanical property dispersity of the composite material is high, and the performance value deviates from an expected design value; and the preparation equipment of the prefabricated body with the bentsection is used for forming a planar strip into the prefabricated body with the n-shaped section, and comprises a feeding and flat strip double-roller guide area I, a geometric section rolling formingarea II and a bent rolling forming and guide output area III which are sequentially connected. Fibrosis is controllable, and reliability and repeatability are good; the operation is continuous, the process is continuously repeated to obtain the preform with unlimited length, and the production efficiency is high; and the cutting loss in the forming process is small, the material cost can be reduced, and forming of preforms with different sections is met.

Description

technical field [0001] The invention belongs to the technical field of resin-based composite material molding, and relates to a preparation device and method for a prefabricated body with a bent section. Background technique [0002] There are "П" type, "L" type, "Z" type and other multi-bending corner resin-based composite parts with curvature on the aircraft. Such parts often have an assembly relationship, and their dimensions and surface precision require high. This type of composite material parts based on fabric layup requires external force to attach the fabric to the surface of the mold tooling during the layup stage. For complex curved surfaces that cannot be developed, draping requires the fabric to conform to the tooling surface through deformation. [0003] At present, this kind of prefabricated body is prepared by manual laying method, which currently has the following problems: (1) The external force applied by hand is uncontrollable and random, resulting in u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B11/14B29B11/12
CPCB29B11/14B29B11/12B29C49/071B29C2949/0715
Inventor 马金瑞黄峰刘强赵龙王宇
Owner AVIC BASIC TECH RES INST
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