JPS588163A - Reinforcing middle body and production thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel intermediate that serves as a reinforcing material for composite materials and a method for manufacturing the same. The composite material is characterized in that the arrangement of the filament threads 1 is changed according to the shape of the composite material molded product (hereinafter referred to as composite) to be knitted and arranged and then molded.◎ In order to maximize its reinforcing effect, the key to molding technology is not only to make the physical properties of the intermediate itself strong, but also how to efficiently arrange the intermediate in the direction where stress is applied. To produce a resin-impregnated material having unidirectional complementary fibers (hereinafter referred to as prepreg), the required number of filament yarns are uniformly arranged and impregnated with resin to form a sheet. Arrangement is the most important factor in the manufacturing process @ In this case, the molded product is mostly straight, and in the case of various curves and curved surfaces, the filament alignment is the most important in the manufacturing process. It goes without saying that the threads must be arranged in a certain way, but in order to achieve this goal, it is necessary to create a specially formed fabric or to make shoes similar to the aS material. One method is to raise the finger while shaking the thread. However, both methods require special techniques and equipment and are not easy.

In producing an intermediate constituting the bonding material having the above-mentioned special shape, the present invention involves forming a planar or cylindrical shape using plating threads in the first step, and then prepreg or the like. This makes it possible to match the final shape during the subsequent molding process. ◎A method for creating an intermediate having such characteristics will be described below.The gist of the present invention is to easily create a filament yarn that has a reinforcing effect. In order to stabilize one arrangement, it is covered with a plating thread, and the covering method is also performed by a knitting operation to create elastic 7-ply ivy, which is often used in general clothing. 1 reinforcing filament yarn is included in the string, and after that, the filament yarn aggregate arranged in parallel by the 0th stitch, which is subjected to the 1a shape processing process, freely expands and contracts the yarn by the 1st stitch expansion and contraction. It is deformed by expanding or twisting in all directions within the range where the distance can be expanded or contracted.◎By such deformation, a desired curved surface can be formed into a three-dimensional shape, and prepreg and molding can be performed in that form.

Next, how to form an array of filament thread bundles with plating threads is as follows: 1. First, the plating threads themselves form stitches. The method for creating the stitches requires a knitting machine with at least one stitch bed, and using a testing machine, knit the plating yarn so that stitches are alternately formed with each knitting needle of at least one stitch bed. In this case, the knitting stitches of plating yarn may be formed sequentially while inserting the filament thread serving as a reinforcing material between the alternating stitches that meet. The needles do not necessarily have to be arranged alternately, but one opposing needle is l1lW7! at the same time. i may be formed (double-sided structure)
They may be formed alternately (rip structure); in short, if the filament threads are inserted between the stitches formed by one stitch on both needle beds, array formation is established. In addition, the size of the stitches should be determined by calculating the degree of deformation of the filament yarn bundle based on the thickness of the filament yarn to be inserted, the thickness of the plating yarn, and the shape of the molded product to be formed afterwards. The degree of deformation increases as the first stitch of E becomes larger. An example of the form of the reinforcing intermediate with plating thus obtained will be explained with reference to the drawings. Figure 7 shows the opposite a
Using a knitting machine with a needle bed, a reinforcing filament yarn is fed to the middle of both needle beds just before stitch formation to form a stitch of rip structure with a plating thread. 6Wi showing the state of the knitted fabric obtained by inserting it between the sewn stitches
In (1) is the stitch knitted by the needle on one side of the needle bed using the plating thread, and (C) is the stitch knitted by the needle on the needle bed on the other side.6 (J) is the stitch knitted by the needle on the needle bed on the other side. As shown in 1WJ, the filament yarn serving as a reinforcing material is inserted between the first and second stitches (1) and (1), which are pierced by needles on both needle beds.The knitted fabric thus obtained is As shown in Part 1, the east side of the filament yarn (J) serving as a reinforcing material inserted between the stitch groups (1) and (J) of the plating yarn is arranged in parallel to form a sheet shape. Due to the nature of the knitted fabric formed from plating threads, the sheet as a whole is highly elastic and easily deforms. The sheet-like intermediate obtained by this deformation can be easily arranged into a sheet suitable for the shape of the desired composition. By impregnating it to improve moldability and adhesion, and then covering it with a matrix resin and performing a curing treatment, the desired composite can be obtained.In this case, the plating thread should have properties that have good affinity with the matrix resin as much as possible. Preferably.

Example 3,000 carbon fibers were inserted into the plating by inserting filament threads of OD/Co41F made of Melia synthetic fibers into the plating threads.
A filament yarn with an average thickness of I 11111) was prepared, and a nine-needle bed knitting machine (needle density 16/inch) consisting of a cylinder and a dial was used to change the stitch length (the stitches were oriented in the course direction). The length when stretched to ) is ji
The cam was set so that the plating yarn was knitted into a lip structure, and at the same time, the carbon fiber filament yarn was fed between the cylinder and dial needle bed and inserted between the stitches knitted by the needles on both needle beds to create Sea F. did. Next, after attaching a layer of epoxy resin to the sheet, the epoxy resin is layered in a mold having a drum-shaped cross section as shown in Figure 1, spreading the sheet toward both ends (the weight ratio between the center and both ends is adjusted). The sheets of each layer were arranged in a uniform manner.Then, the epoxy resin that would become the matrix was flowed into the mold.The carbon resin was heat-cured at 30C. is J
A composite plate having the shape shown in the first factor of J capacity was obtained. 6 In the vertical cross section of the plate, carbon fiber filament threads serving as reinforcing materials were buried in the matrix as shown in No. 11117 to provide a reinforcing effect. He is demonstrating his full potential.

In addition, the insertion of reinforcing material yarn into a knitted fabric in the present invention refers not only to insertion in the course direction of a weft knitted fabric as described in the main text, but also to insertion in the wale direction and insertion into a warp knitted fabric. It is possible to obtain intermediates with sequence changes that

[Brief explanation of drawings]

Figure 1 shows the state in which the reinforcing filament yarn is included in the stitches of the plating thread. Figure J is an external view of the intermediate sheet made with the stitch configuration shown in Figure 1Iiy. Figure 3 shows both ends of the sheet. I expanded the part and transformed it! ! Figure 1 is a sketch of the composite board made as a sheet reinforcing intermediate shown in Figure #IJ.〇141 Figure Samurai 3 Figure 4

Claims (1)

[Claims] (1) A reinforcing intermediate seed, characterized in that reinforcing system bundles inserted and arranged in a knitted fabric of plating yarns are arranged so as to change according to the expansion and contraction of the stitches. (J) By forming an S in the plating yarn and incorporating it into the stitch group of the plating yarn, the arrangement of the yarn can be changed according to the expansion and contraction of the stitch group. A method for producing a reinforcing intermediate sheet, characterized in that: