40results about How to "Increased fiber volume content" patented technology

The invention relates to a die and method for molding a composite material of a semi-closed cavity gridding stressed-skin structure. The die comprises a core die bush (1), a male die body (2), an external female die body (3) and a lower-end pressing ring (4) having a supporting effect on the core die bush (1) and the external female die body (3); the male die body (2) is formed by splicing sectioning die sheets and is wrapped outside the core die bush (1), protrusions are arranged in the middle portion of the outer surface of the male die body (2), and rib grooves are formed between the protrusions; the external female die body (3) is wrapped outside the male die body (2), the distance between the external female die body (3) and the outer surface of the protrusions ranges from 1 mm to 5 mm, the external female die body (3) forms an upper-end thickening area (5) in an area without the protrusions, and the male die body (2) forms a lower-end thickening area (8) in the area without the protrusions; and the molding method includes the step that a semi-closed composite material component is manufactured through the die, wherein the upper-end thickening area (5) and the lower-end thickening area (8) are used for paving of prepreg so as to form end frames, and the rib grooves are used for wining of presoaking wires so as to form strengthening ribs. The composite material component is high in strength, and the gridding compactness is high.

The invention provides a side strip slender composite material airfoil and a molding method thereof. The side strip slender composite material airfoil is layered symmetrically in a stepped shape at the center of the cross-section through carbon fiber UD cloth, and Z-direction stitching is performed after the layers are laid for toughening. , using a combined autoclave / VARTM process based on autoclave injection of resin into prefabricated reinforcements and curing. Aiming at the slender composite material airfoil of the edge strip, the invention adopts the integrated molding of the overall layering, the layering is stitched and toughened in the Z direction, and is formed by the autoclave / VARTM process, which makes up for the poor interlayer performance of the products prepared by the traditional layering process. The weak defect improves the interlayer performance, maintains a high fiber volume content and product molding quality, and ensures the comprehensive performance of the composite airfoil.

The present invention provides a 3D printing raw material, its 3D printing method and a 3D printed product. The printing raw material includes a plurality of block units, wherein any block unit is made of fiber reinforced thermoplastic resin material. The method includes: step 1, preparing 3D printing raw materials, including: using block units as 3D printing units, and obtaining block units to be used for each printing layer according to slice analysis of pre-printed components; forming the block units of each printing layer; The surface of the formed block unit is coated with adhesive or the surface of the block unit is provided with welding lines; step 2, according to the obtained block unit of each printing layer, each printing layer is printed layer by layer in sequence, and the printing layer They are also bonded and connected by the adhesive or welded by the welding wire. The invention can solve the technical problems of poor mechanical properties of the obtained parts and slow printing speed for large parts when the continuous fiber reinforced material is used to prepare 3D printed parts.