6 results about "Sandwich-structured composite" patented technology

The invention discloses an expandable and contractible large-diameter sandwich structure mold and a forming process method, solves the process problem of continuous high-quality forming of inner and outer skins of a super-large-diameter rotary sandwich structure composite material, and belongs to the technical field of advanced manufacturing of structural composite materials. The invention is oriented to the manufacturing of large composite components, breaks through the splicing structure and the sealing method of the modular composite combined die, successfully solves the problem of matching of thermal expansion coefficients of the composite components and the die, and reduces the influence of the die on the dimensional accuracy of the composite component product as much as possible; a space frame structure scheme is adopted, the difficult problem of mold profile rigidity control is solved, a forming mold split airtight system is designed, and the airtight requirement in the composite material sandwich structure barrel forming process is met; the mold can be disassembled and assembled in a split mode and can be repeatedly used, and the manufacturing cost of the component mold is reduced.

A method of the present disclosure includes inserting thermoplastic components into a mold such that at least two or more thermoplastic components are adhered to an inner wall of the mold. The thermoplastic components are substantially hollow and made of a thermoplastic material. The method includes applying pressure onto the thermoplastic components adhered to the inner wall in a direction towards the inner wall of the mold to compress the thermoplastic components. The method includes heating the thermoplastic components concurrently with applying the pressure such that a first portion of the thermoplastic material of the thermoplastic components forms a first sheet on a first side of the thermoplastic components and a second portion of the thermoplastic material of the thermoplastic components forms a second sheet on a second side of the thermoplastic components opposite to the first side. The first sheet connects the plurality of thermoplastic components.

The application discloses a high-temperature energy storage sandwich structure composite material and a preparation method thereof. A polyamide acid precursor solution A with dispersed oxide aerogel is used as insulating layer slurry, a polyamide acid precursor solution B with dispersed BBC is used as polarization layer slurry, the polarization layer and the insulating layer are sequentially and layer by layer cast by adjusting the height of a doctor blade and drying conditions, a sandwich structure is prepared, and after gradient temperature imidization, the sandwich structure is placed in a hot press to make the interlayer polymers undergo thermal fusion by accurately controlling the temperature and time, so that a seamless and thickness-stable sandwich structure is formed.

The application relates to a method for testing the in-plane shear performance of a sandwich structure composite material, comprising the following steps: preparing a test piece with a sandwich structure, wherein the test piece with the sandwich structure comprises a core plate, non-test panels and test panels adhered to upper and lower end surfaces of the core plate; bonding three reinforcing plates on the test panels at intervals along the width, which are respectively a middle reinforcing plate and two side end reinforcing plates, gaps are arranged between the middle reinforcing plate and the corresponding side end reinforcing plates, the middle reinforcing plate and the two side end reinforcing plates extend out of the test panel in opposite directions, wherein a first connecting hole is arranged at the extending end of the middle reinforcing plate, and clamp connecting holes are arranged at the extending ends of the two side end reinforcing plates; saw slits corresponding to the upper and lower gaps of each gap are arranged on the non-test panels, and the depths of the saw slits extend into the test piece; and the problems of a complex test fixture and low test efficiency of a civil aviation cabin floor test are solved through the above design.

The invention relates to the technical field of aircraft composite material manufacturing, in particular to a sandwich structure composite material hole making method. According to the method, a replaceable tool bit with a gradually-changed sawtooth cutting structure is adopted, and a double-positioning system with guide rod positioning and end face attaching to a positioning ring is matched, so that precise locking of the drilling position is achieved; the tool bit is integrated with an inner cooling channel and a spiral flow guide groove, and a cooling medium is synchronously conveyed and chippings are discharged during drilling; an elastic scraping blade is arranged at the tail of the tool bit, and burr cleaning is synchronously completed after hole forming. According to the drilling tool, the tool bit can be replaced quickly through the quick-release structure, and the requirements of different hole diameters are met. The technical problems of layering, hole diameter deviation, untimely heat dissipation and the like in the hole forming process of the sandwich structure composite material are effectively solved, the hole forming process is simplified, the hole forming efficiency and the hole wall quality are improved, the universality is high, and the method is suitable for various sandwich structure hole forming scenes of an aircraft composite material assembly site.

The preparation method comprises the following steps: taking a polyamide acid precursor solution A dispersed with oxide aerogel as insulating layer slurry, and taking a polyamide acid precursor solution B dispersed with BBC as polarization layer slurry; the height of a scraper and drying conditions are adjusted, a polarization layer and an insulating layer are subjected to layer-by-layer tape casting in sequence, a sandwich structure is prepared, the sandwich structure is placed in a hot press after gradient heating imidization, interlayer polymers are subjected to heat fusion by accurately controlling the temperature and time, and the sandwich structure which is seamlessly combined and stable in thickness is formed.