Negative curvature composite material grid structural member and forming method thereof
A composite material and grid structure technology, applied in household components, other household appliances, household appliances, etc., can solve the problems of hysteretic grid structure application, inability to adopt winding molding, and difficulty in winding molding, and achieve obvious technical advantages, The effect of improving the degree of automation, improving molding quality and molding efficiency
Pending Publication Date: 2022-04-12
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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Problems solved by technology
[0002] The automatic forming of composite grid structure mainly adopts the geodesic winding forming process. Due to the constraints of non-bridging, periodicity and geodesic in the winding process, the existing grid structure is generally used in simple rotary structures such as cones and columns. And the ribs are uniformly distributed in the circumferential direction, and the more complex curved generatrix or folded generatrix revolving mesh, especially the mesh structure with local negative curvature, can not be wound, or the winding is too difficult, which delays the mesh The application of structure on this column
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Embodiment 1
[0062] This implementation adopts a forming method of a negative curvature composite grid structure of the present invention to prepare a tapered negative curvature grid member:
[0063] The outer diameter of the lower end frame 1 of the conical negative curvature grid member is 1000mm, the outer diameter of the upper end frame 2 is 750mm, the cone angle is 50°, the curvature radius of the generatrix of the negative curvature grid 3 is 5m, and the upper and lower end frames are L-end frames. The thickness is 8.4mm, the flanging length is 45mm, and the layup adopts quasi-isotropic layup [-45 / 0 / 45 / 90] 7S , the section of rib 4 is isosceles trapezoid, the length of the upper bottom of the trapezoid is 6mm, the length of the lower bottom is 7.5mm, the height of the trapezoid is 8mm, the upper bottom is the inner surface of the product, the helix angle of rib 4 is ±30°, and 40 ribs 4 are along the circumference Equal helix angle distribution, the specific structure see figure 2 ....
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Abstract
The invention discloses a forming method of a negative-curvature composite material grid structural member, which comprises the following steps of: laying prepreg filaments for forming negative-curvature grid ribs in a grid mold, breaking the prepreg filaments in a node area when the prepreg filaments are laid, scattering the tail ends of the prepreg filaments, laying the prepreg filaments to an adjacent area of a negative-curvature grid, and alternately laying the prepreg filaments and prepreg for forming an end frame, so as to form the negative-curvature composite material grid structural member. The application range of the grid structure is expanded from a simple rotation structure to a rotation-like complex surface, the limitation of bridging and periodicity of an existing forming process is broken through, and automatic forming of the negative curvature grid structure with negative curvature and non-periodicity can be achieved. The invention further discloses the negative-curvature composite material grid structural part obtained through the forming method based on the negative-curvature composite material grid structural part. The negative-curvature composite material grid structural part can be applied to research and production of spaceflight rocket body grid cabin sections, aircraft fuselages, wings and the like.
Description
technical field [0001] The invention belongs to the technical field of manufacturing resin-based structural composite materials, and relates to a negative-curvature composite grid structure and a forming method thereof. Background technique [0002] The automatic forming of composite grid structure mainly adopts the geodesic winding forming process. Due to the constraints of non-bridging, periodicity and geodesic in the winding process, the existing grid structure is generally used in simple rotary structures such as cones and columns. And the ribs are uniformly distributed in the circumferential direction, and the more complex curved generatrix or folded generatrix revolving mesh, especially the mesh structure with local negative curvature, can not be wound, or the winding is too difficult, which delays the mesh The application of the structure on the components in this column. Contents of the invention [0003] The purpose of the present invention is to overcome the abo...
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IPC IPC(8): B29C70/30B29L31/30
Inventor 张建宝刘永佼沈登雄提亚峰陈亮周子玥程雷孙宏杰张会杰孙舰肖利川
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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