CN105082561B

CN105082561B - Manufacturing method of double-arc structure of composite material triangular filling area

Info

Publication number: CN105082561B
Application number: CN201510599737.4A
Authority: CN
Inventors: 石庆华; 石林
Original assignee: AVIC Composite Corp Ltd
Current assignee: AVIC Composite Corp Ltd
Priority date: 2015-09-18
Filing date: 2015-09-18
Publication date: 2020-12-29
Anticipated expiration: 2035-09-18
Also published as: CN105082561A

Abstract

The invention belongs to the technical field of composite material structure forming processes, and relates to a manufacturing method of a double-circular-arc structure of a triangular filling area of a composite material. The tool provided by the invention comprises a left supporting rolling disc, a right supporting rolling disc, a roller, a rocker arm and a bracket. The cross sections of a tool cavity defined by the left support rolling disc, the right support rolling disc and the rollers are precisely consistent with the cross sections of the double-arc triangular area filling structure; a rocker arm is arranged on the roller; the left supporting rolling disc, the right supporting rolling disc and the roller are simply supported and fixed on the bracket through respective axes, and all the shafts can freely rotate; the outer ring surface of the left supporting rolling disc and the right supporting rolling disc is a cambered surface, and the radian of the camber line is the same as that of the camber line of the double-circular arc in the triangular area. The tool and the forming process provided by the invention realize the accurate manufacturing of the composite material structure triangular area filling structure. The forming quality of the composite material reinforced structure is greatly improved.

Description

Manufacturing method of double-arc structure of composite material triangular filling area

Technical Field

The invention belongs to the technology of composite material structure forming technology, and relates to a manufacturing method of a double-arc structure of a composite material triangular filling area.

Background

Aircraft composite structures such as composite wing panels and composite fuselage panels are often designed in the form of stiffened structures. These stiffened structures have a triangular region at the junction of the rib and the skin. The shape of the triangle, defined here as: a triangular area with a circular arc is defined as a single circular arc triangular area; the triangular area with two circular arcs is defined as a double circular arc triangular area. This patent only studies the double circular arc trigonometry structural style. In a typical composite panel manufacturing and forming process, the triangular filling area is manufactured by: and (3) calculating the quantity of zero-degree fibers required for filling according to the area of the triangular area by adopting the zero-degree fibers, twisting the zero-degree fibers into a cylindrical shape, and directly filling the cylindrical shape into the triangular area. And packaging and molding to manufacture the composite material reinforced wall plate structure.

The composite panel structure thus formed generally has various defects in the triangular region, such as fiber buckling defects, triangular region grease-rich defects, triangular region delamination defects, triangular region filling region offset, and the like. Experimental statistics show that 60% -70% of defects of the composite material occur in a triangular area. The composite material manufactured by the method has the advantages that the forming quality of the triangular area is difficult to control, and the composite material is seriously influenced by human factors, such as the tightness of the zero-degree fiber twister strip, the cylindricity and the cylindricity, and the consistency principle of the manufacturing structure is not met.

Composite material wing wall plates and composite material fuselage wall plates are large important structures in airplane structures, and the existence of manufacturing defects of triangular areas can directly cause that products cannot be delivered; the tiny undetected triangular area manufacturing defects cause certain potential safety hazards to the airplane. Therefore, the traditional manufacturing method of the composite triangular area structure is changed, and the accurate manufacturing technology of the triangular area is necessary.

Disclosure of Invention

The invention aims to improve the forming quality of a composite material with a triangular area, and provides a manufacturing method of a double-arc structure of a triangular filling area of the composite material, so as to accurately manufacture the double-arc structure of the triangular filling area of the composite material. The technical solution of the invention is as follows:

(1) preparation of forming tool

The forming tool comprises a left supporting rolling disc, a right supporting rolling disc, a roller, a rocker arm and a bracket, wherein the outer annular surfaces of the left supporting rolling disc and the right supporting rolling disc are cambered surfaces, the axes of the left supporting rolling disc and the right supporting rolling disc are on the same plane, the left supporting rolling disc and the right supporting rolling disc are adopted, the axis of the roller forms a plane, the supporting rolling disc is cut by the plane to form an arc section, the right supporting rolling disc is cut by the plane to form an arc section, the roller is cut by the plane to form a bus section, and a cavity formed by the two arc sections and the bus section is the same as the cross section of a double-arc structure of a triangular filling area; the axis of the supporting rolling disc is vertical to the axis of the supporting rolling disc, the roller is arranged right above the left supporting rolling disc and the right supporting rolling disc, and the shaft end of the roller is provided with a rocker arm; the left supporting rolling disc, the right supporting rolling disc and the roller are fixed on the bracket through respective axes through bearings, and the shafts rotate freely;

(2) double-arc structure of forming triangular filling area

According to the area of the triangular area, the quantity of zero-degree fibers needed by the filled circular triangular area is calculated, the zero-degree fibers are twisted into a cylindrical shape, the zero-degree fiber twister strips are held by hands and placed in a cavity defined by the two circular arc sections and the bus section, and the rocker arm on the roller is slowly rotated by hands, so that the double-circular-arc structure of the composite triangular filling area is obtained.

Two ends of the roller shaft are respectively provided with a rocker arm.

The present invention has the advantages and advantageous effects that,

the invention adopts a structure of two rolling discs and one roller, which acts on zero-degree fiber twister strips together, and leads the arc line of the rolling discs to be the same as the double arcs of a triangular filling area, so that the double arc structure of the triangular filling area is fully filled in the triangular area.

According to the tooling and the forming process provided by the invention, the main defects of the double-circular-arc triangular filling area of the formed composite material structure, such as fiber buckling defect in the triangular area, grease-rich defect in the triangular area, layering defect in the triangular area, offset of the filling area in the triangular area and the like, are greatly reduced. Moreover, the method greatly reduces the artificial influence of the forming of the zero-degree fiber twister strip. The method greatly improves the forming quality of the product, improves the yield of the composite material product, and provides a powerful guarantee for the precise manufacture of composite material structures of airplanes, such as composite material wing wall plates, composite material fuselage wall plates and the like.

Drawings

Fig. 1 is a schematic view of the tool structure of the present invention.

Fig. 2 is a schematic sectional structure diagram of the tool of the present invention.

The invention is described in detail below with reference to the attached drawing figures:

the tool for manufacturing the composite material double-arc triangular-area filling structure comprises a left supporting rolling disc 1, a right supporting rolling disc 2, a roller 3, a rocker arm 4 and a support 5. The left supporting rolling disc 1, the right supporting rolling disc 2 and the rollers 3 form a tool cavity which is accurately consistent with the cross section of the double-arc triangular area filling structure; a rocker arm 4 is arranged on the roller 3; the left supporting rolling disc 1, the right supporting rolling disc 2 and the roller 3 are simply supported and fixed on the bracket 5 through respective axes, and all the shafts can freely rotate; the outer surfaces of the left supporting rolling disc 1 and the right supporting rolling disc 2 are convex, and the arc lines are the arc lines of the double arcs of the triangular area. By adopting the forming tool, the process for manufacturing the composite material double-circular-arc triangular-area filling structure is as follows: calculating the number of zero-degree fibers required for filling by adopting zero-degree fibers according to the area of the triangular region; twisting the zero-degree fibers into a cylindrical shape; and (3) manually holding the zero-degree fiber twister strip, placing the zero-degree fiber twister strip in a cavity of the tool, and manually and slowly rotating the rocker arm 4 on the roller 3. Under the pulling action of the friction force between the surface of the zero-degree fiber twister strip and the surface of the roller 3 and the extrusion action of the tool cavity, an accurate composite material double-arc triangular area filling structure is formed.

In the course of operation,

firstly, calculating the number of zero-degree fibers needed for filling the circular arc triangle area according to the area of the triangle area. The zero degree fibers may be extracted directly from the unidirectional tape. The cross section area of the selected zero-degree fiber is consistent with the area of the triangular area interface of the composite material structure to be formed.

And secondly, twisting the zero-degree fibers into a cylinder. The twister strip is just required to be approximately cylindrical, and the twister strip does not need to be twisted too tightly.

And thirdly, holding the zero-degree fiber twister strip by hand, placing the zero-degree fiber twister strip in a cavity of the tool, and manually and slowly rotating a rocker arm (4) on the roller (3). Because the cross section shape of the twill strip is inconsistent with the shape of the tool cavity, the twill strip needs to be pressed into the tool cavity by certain force at the beginning. The speed of the rocker arm (4) on the rotating roller (3) is kept at 30-50 mm/min.

Claims

1. A method of manufacturing a bi-arc structure of a composite delta-filled area, the method being used to accurately manufacture the bi-arc structure of the composite delta-filled area at the joint of a rib and a panel during the manufacture of a composite wing panel-like structure, the method comprising:

(1) preparation of forming tool

The forming tool comprises a left supporting rolling disc (1), a right supporting rolling disc (2), a roller (3), a rocker arm (4) and a support (5), wherein the outer annular surfaces of the left supporting rolling disc (1) and the right supporting rolling disc (2) are cambered surfaces, the left supporting rolling disc (1) and the right supporting rolling disc (2) are provided with cambered surfaces, the axis of the roller (3) is arranged on one plane, the left supporting rolling disc (1) and the right supporting rolling disc (2) are adopted, the axis of the roller (3) forms one plane, the supporting rolling disc (1) is cut by the plane to form an arc section (7), the right supporting rolling disc (2) is cut by the plane to form an arc section (8), the roller (3) is cut by the plane to form a bus section (9), and a cavity formed by the two arc sections (7 and 8) and the bus section (9) is the same as the cross section of a triangular filling area double-arc structure; the axis of the supporting rolling disc (1) is vertical to the axis of the supporting rolling disc (2), the roller (3) is arranged right above the left supporting rolling disc (1) and the right supporting rolling disc (2), and the shaft end of the roller (3) is provided with a rocker arm (4); the left supporting rolling disc (1), the right supporting rolling disc (2) and the roller (3) are fixed on the bracket (5) through respective axes through bearings, and the shafts rotate freely;

(2) double-arc structure of forming triangular filling area

According to the area of the triangular area, the quantity of zero-degree fibers needed by the filled circular-arc triangular area is calculated, the zero-degree fibers are twisted into a cylindrical shape, the zero-degree fiber twister strips are held by hands and placed in a cavity defined by two circular-arc sections (7 and 8) and a bus section (9), and a rocker arm (4) on a roller (3) is manually and slowly rotated to obtain the double-circular-arc structure of the triangular filling area of the composite material.

2. The method for manufacturing the double-circular-arc structure of the triangular filling area of the composite material according to claim 1, wherein a rocker arm (4) is respectively installed at two ends of the shaft of the roller (3).