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

An additive printer dispenses filament having high volume content of axial reinforcing fibers impregnated with a partially cured thermoset material. Partial curing provides sufficient mechanical integrity for high-density fiber support and retention while maintaining tackiness necessary to allow layer by layer additive construction. The complete construction may then be heated to provide complete curing.

The invention relates to a composite material platform floor with a netty three-dimensional whole multidirectional linking and weaving structure and a preparation method of the composite material platform floor. The platform floor provided by the invention comprises a knitting yarn system, wherein the knitting yarn system is mutually woven by a three-dimensional weaving movement law according to a four-step process. The composite material platform floor is characterized by further comprising seven yarn systems which penetrate through a workpiece along the x direction, the y direction and the z direction, wherein different yarn systems are mutually interlinked and woven according to different weaving laws to form into a compact three-dimensional whole network structure. The preparation method provided by the invention comprises the following steps of: 1) designing a fabricated part; 2) hanging a wire and winding; 3) weaving (comprising 16 weaving steps); 4) forming in a tightening way; and 5) carrying out compound curing. The composite material platform floor provided by the invention is better in globality, the fiber volume content can be obviously increased, the composite material platform floor is better and reasonable in mechanical property, the performance in the composite material platform floor can be obviously increased, and the composite material platform floor is better in multi-functional characteristic. The composite material platform floor is applicable to a locomotive of an aerodynamic aerotrain with stimulated wings and each compartment.

The invention belongs to a resin based composite material liquid forming technique, and relates to a composite material liquid pressure forming method. The periphery of a predetermined mold body is filled with resin, and the predetermined mold body is continuously pressurized and cured successively by resin via a first pressure source and a second pressure source. According to the invention, the predetermined mold body is pressurized and cured continuously by resin; a molded composite material product not only has high fiber volume content equivalent to a composite material molded by a prepreg/autoclave technique, but also has the high precision equal to the composite material molded by an RTM technique; the applicable range of the composite material molded by a liquid forming technique is expanded; the molding efficiency is improved obviously; the manufacturing cost is reduced.

A lower mold and an upper mold are combined to form an enclosed space containing a production cavity and a sealed room. A base fiber material is placed in the production cavity. The production cavity has a first space and a second space. After a gas in the enclosed space has been discharged, a first predetermined amount of a liquid resin is supplied to the first space. After supply of the liquid resin is stopped (or while the liquid resin is continuously supplied), the upper mold is lowered relatively further toward the lower mold, whereby the volume of the production cavity becomes reduced. Preferably, a second predetermined amount of the liquid resin is supplied to the first space having a large volume, whereupon the supplied liquid resin flows from the first space into the second space having a small volume.

The invention relates to a preparation method for a continuous fibre fabric-reinforced anionic polyamide 6 composite material and the composite material. The composite material is prepared from the following raw materials: caprolactam, a continuous fibre fabric, an initiator and a catalyst, wherein a caprolactam anionic polymerization reaction is adopted, and a reaction liquid is pumped and injected in the paved continuous fibre fabric by virtue of a liquid shaping method and polymerized in a preheated die to obtain the continuous fibre fabric-reinforced anionic polyamide 6 composite material. The preparation method can be used for increasing the fibre volume content in the composite material and obviously improving the mechanical properties of the thermoplastic composite materials, and has important popularization and application prospect in the fields of aerospace and aviation, automobile industry and the like.

A first sealing member and a second sealing member are disposed respectively on a lower mold and an upper mold. During a process of closing the lower mold and the upper mold, a gap between the molds is sealed by the first sealing member, thereby forming an enclosed space between the molds. Thereafter, a gas in the enclosed space is discharged. As the closing process progresses, the enclosed space is divided by the second sealing member into a sealed room and a production cavity, followed by a liquid resin being supplied to the production cavity.

The present invention relates to an RTM molding device designed to mold a FRP molded body by injecting a resin composition into a mold and by impregnating the molded body therewith. The resin composition is a CCP. A CCP accommodating layer is disposed adjacent to the outer side of the molded body. The layer contains the CCP. The layer is provided with a Vf limit value, the value defined by the curing characteristics of the CCP and the characteristics of dissipation of heat from the CCP into the exterior. A means for separating the molded body is disposed between the body and the layer.

The invention discloses a composite fabricated part based on a digital guide template and a preparation method thereof. The composite fabricated part comprises a plurality of guide sleeves and fibers wound among the plurality of guide sleeves, wherein the fibers are in flat strip shape and are laid along the gaps among the plurality of guide sleeves to form a plurality of overlapped laying layers; the strip surface of the fibers extends within the laying layers; and the extending direction of the guide sleeves is crossed with the laying layers. By applying the technical solution provided by the invention, the gaps are relatively small as the fibers are laid along with the gaps among the plurality of guide sleeves to form a plurality of overlapped laying layers, the strip surface of the fibers extends within the laying layers and the extending direction of the guide sleeves are crossed with the laying layers. The thickness of the fabricated part is designed by overlapping the layers of the fiber bundles due to such laying form. At the same time, the fibers are wound to greatly improve the fiber volume content of the composite fabricated part, thereby greatly improving the mechanical property of the composite fabricated part.

The invention relates to a sewing die and method for a strip-shaped composite preform, and belongs to the field of preparation of composite preforms. The method comprises the following steps that firstly, fiber cloth is cut and laminated; secondly, the relative positions of the fiber cloth of all layers are preliminarily fixed; thirdly, mandrel blocks are connected together and are placed in an inverted U shape; fourthly, the fiber cloth is arranged on a mandrel; fifthly, bottom die blocks are connected together, cover the fiber cloth and are fixed; sixthly, left side die blocks and right sidedie blocks are all connected to the mandrel and a bottom die body so as to complete die closing; seventhly, the mandrel blocks, the bottom die blocks and the side die blocks corresponding to the positions are disassembled and sewn, and after the positions are sewn, the die blocks corresponding to the positions are arranged; and eighthly, the seventh step is repeated until the whole sewing operation is completed. The sewing die and method has the advantages that relatively high dimensional precision and dimensional stability of the preform can be guaranteed, meanwhile, relatively high fiber volume content can be achieved, and a final composite product has excellent mechanical properties.

The invention provides a method for increasing the fiber volume content of a vacuum infusion composite product. The method comprises the following steps of (1) applying a thermoplastic setting agent onto the surface of a carbon fiber fabric to form a preform; (2) laying the preform on a preform mold through a heating and vacuum preloading method, moving the preform to a molding press for pressurization after completion of laying of the preform and conducting vacuum sealing with a self-sealing bag after completion of pressurization; and (3) laying release cloth, a flow guide net and a vacuum bag in sequence on the preform prepared in the step (2), and conducting glue injection through connection of a vacuum pipe. By means of the method, the fiber volume content of the composite product formed through a liquid forming process is increased, the porosity is reduced, and the level of the liquid forming process and an autoclave molding process is further improved. A thought is provided for application of liquid forming in the high-end field, especially the aviation and aerospace field.

The invention provides a 3D printing raw material and a 3D printing method and 3D printing product adopting the same. The printing raw material comprises a plurality of block units, wherein a materialof one random block unit is a fiber reinforced thermoplastic resin material. The method comprises: S1, preparing the 3D printing raw material, which comprises: using the block units as 3D printing units, and according to slice analysis of a to-be-printed component, obtaining the block units which need to be used by each printing layer; forming the blocking units of each printing layer; and coating the surfaces of all the formed block units with an adhesive or arranging welding lines on the surfaces of all the block units; S2, according to the obtained block units of each printing layer, sequentially printing each printing layer layer by layer, and carrying out adhesion connection by the adhesive or carrying out welding connection by the welding lines among the printing layers. The invention can solve the technical problems that when a continuous fiber reinforced material is adopted to prepare the 3D printing product currently, the obtained product is poor in mechanical property and for a large product, a printing speed is low.

Provided is an RTM molding method enabling to yield an FRP molded body formed so as to be increased in the fiber volume content and to thereby be made more excellent in strength and lightweightness. The resin composition is a chain-curing resin composition, and after the initiation of the curing of the resin composition, the highest temperature at the curing head of the resin composition, undergoing chain curing, within 10 seconds after the initiation of the curing is increased to be higher by 50° C. or more than the temperature of the resin composition at after the impregnation and before the curing, and thus, the resin composition is chain-cured with a Vf of 41% or more.

The invention relates to a conical whole textile reinforcing body which is formed by a top part and a body part in a whole consistent mode. Structure of the top part of the conical whole textile reinforcing body is made of a multilayer woven fabric connect connected by coinciding layer and layer through warps. The connecting warps are only arranged between two neighboring layers of sublayers fabric, and achieving connecting of the adjacent layers of sublayers fabric by coinciding with the sublayers fabric in a same longitudinal cross section in a fabric width direction. Due to mutual structural independence of the sublayers, when a superficial layer is damaged, destruction on the top part is not prone to spread to inner layers, and the inner layers still have structural integrity, and thus the conical whole textile reinforcing body can resist abrasion and ablation, and can be widely applied to fields of aviation, aerospace, weapon, civilian use and the like.

The invention provides a low-friction, high-resistance-reduction, light-weight and high-strength bobsleigh and a forming method. The shape of the outer surface of a shell is designed, so that the shell meets the specific curve requirement in a coordinate system. The characteristics of low friction, high resistance reduction, light weight and high strength of the bobsleigh can be achieved, in addition, through the installation of a front protective cover and a rear protective cover, the bobsleigh has better impact resistance, the shell is formed and processed by adopting a composite material through a female die forming method, the overall dimension and the profile precision of the shell are improved by combining a curing tank curing process and a vacuum bag coating process, and the bobsleigh being low in the friction, high in the resistance reduction, light in weight, high in strength and high in reliability is achieved.

A fiber-bond type ceramic material 4 is produced by using as raw material fibers 1 inorganic fibers of Si-M-C-O synthesized by melt spinning polycarbosilane, then infusibilizing the produced threads, and firing the set threads, forming from the raw material fibers a woven fabric 2 having all the fibers thereof extended perpendicularly or obliquely relative to the direction of compression during the course of a hot-press fabrication at a weaving step 12, heat-treating the woven fabric in the air, thereby preparing a woven fabric of oxidized fibers 3 provided with an oxide layer on the surface thereof at an oxidizing step 14, and subjecting the woven fabric of oxidized fibers to a hot-press fabrication while compressing the fabric in the direction of the compression thereby causing the oxide layers on the surface to adhere fast to each other and form a matrix at a hot-press step 16.