RU2023073C1 - Method for manufacture of hollow multilayer woven intermediate product - Google Patents

Abstract

FIELD: production of reinforcing materials in structures of complicated forms maximum close to spherical and made of composite materials. SUBSTANCE: warp yarns are drawn-in on loom, chord of segment section is placed parallel to loom shed. Process of forming contour of intermediate product is carried out, first, with minimum width of loom shed by reed by introduction of warp yarns to obtain maximum width of loom shed by reed with subsequent withdrawal of warp yarn to provide for minimum width of loom shed by reed. When intermediate product is made on jacquard machines, direction of laying of weft yarn for reverse is changed with respect to that adopted at the stage of introduction of warp yarns in formation of contour. EFFECT: higher efficiency. 6 dwg, 3 tbl

Description

 The invention relates to the textile industry, in particular to a method for manufacturing hollow multilayer fabrics used as reinforcing materials in complex structures, as close as possible to spherical and made from structural materials.

 The closest in technical essence to the achieved result is the method according to ed. N 742497, CL D 03 D 41/00, 1980, which discloses a method for producing a hollow woven blank. This method consists in the fact that the main threads are woven on a weaving machine with the installation of a filling line, the upper and lower multilayer woven fabrics are formed, they are interconnected by the transition of the weft threads from one layer of the upper fabric to a similar layer of the lower fabric and form a segmented area by changing the number of threads involved in the refueling.

 The disadvantage of this method is the low quality of the resulting blanks due to the impossibility of obtaining equal strength structure of the arcuate parts of segmented sections.

 The purpose of the invention is to improve the quality of the resulting workpieces by increasing the uniform strength of the structure of the arcuate parts of segmented sections.

 This goal is achieved by the fact that in the method of producing a hollow multilayer woven blanks, which consists in the fact that the main threads are pierced on a weaving machine with the installation of a filling line, the upper and lower multilayer woven fabrics are formed, they are interconnected by passing the weft threads from one layer of the upper fabric in a similar layer of the lower fabric and form at least one segment-shaped area by changing the number involved in the refueling of the main threads.

 The chords of the segment-shaped sections are parallel to the filling line, and the formation of each segment-shaped section is carried out from the minimum width of the dressing by entering the main threads of the paintings to obtain the maximum width of the dressing and the subsequent withdrawal of the main threads to obtain the minimum width of the dressing.

 In FIG. 1 shows a schematic representation of the position of a hollow multilayer woven workpiece in the process of development on a weaving machine, where AA is the direction of the geometric axis of the products; BB - the direction of the warp.

 A hollow multi-layer woven blank includes (at least) 2 webs; options for multi-layered multiple of two weaving blanks are possible.

 Figure 2 shows a schematic representation of the position of a hollow multilayer woven workpiece on a machine when producing 2 by a linen weaving method and when lacing a Jacquard machine with a double-ended arc, where OO is the direction of the geometric axis of the product; AA - the direction of the warp.

 Figure 3 shows a schematic representation of a hollow multilayer woven blanks on a machine with a 4-web weaving method, where 3 a is a diagram of the procedure for laying weft yarns during the weaving of the 1st half of the blank (at the stage of insertion of warp threads); 3 b is a diagram of the procedure for laying weft threads in the process of weaving the second half of the workpiece (at the stage of withdrawal of warp threads).

 Figure 4, 5 shows a schematic illustration of a hollow multilayer woven blanks, cut along the axis AA (figure 2) in the molten (dressed on a mandrel) state. In our example, the hollow body of rotation of the second-order curve is as close as possible to the hemisphere.

 In FIG. 4 shows a view of a hollow multilayer woven blank obtained by a 2-web weaving method.

 In FIG. 5 shows a view of a hollow multilayer woven blank obtained by a 4-web weaving method.

 Figure 6 shows a schematic representation of a hollow multilayer woven billet (contour) obtained as a result of a "sweep" of the body of revolution, where a is for a 2-web weaving method; b - for a 4-linen weaving method.

 In accordance with the program card of the Zhikkardovy machine, warp threads form a pharynx, into which a weft thread is introduced, interwoven with warp threads, forming a workpiece web, alternating from one layer of the upper web to a similar layer of the lower web, and vice versa, the weft thread connects the upper and lower web in marginal zones, forming at least one segmented area. By positioning the geometrical axis of the workpiece perpendicular to the refueling line of the machine, i.e. perpendicular to the warp threads, we begin the formation of the contour with the minimum width of the machine thread along the bead and, gradually (in accordance with the calculation) forming segment-like sections and introducing the main threads into the weave, we reach the maximum width of the machine thread, while the weft threads passing from the upper fabric to the hollow multilayer woven blanks in the bottom, provide a holistic material. Further formation of the workpiece contour is carried out by removing the warp threads from the weave (in accordance with the calculation), forming segment-shaped sections until the minimum width of the machine refueling along the reed is reached, the chords of the segment-shaped sections are parallel to the filling line, i.e. perpendicular to the geometric axis of the product.

, изменив на прокладываний 1-ой уточной нити раппорта переплетения по утку справа налево

(фиг.3-3а, 3б), в противном случае будут получены 2 или 4 (в зависимости от ошнуровки машины Жаккарда) заготовки вдвое меньше расчетной величины.With a 4-linen or more weaving method, it is necessary, having reached the maximum width of the machine refueling during weaving, and having worked out the area corresponding to the calculation, change the direction of weft weaving, for example, the initial weaving of the first weft weft repeat weft from left to right

by changing to laying the 1st weft thread of the weave repeat pattern from right to left

(Fig.3-3a, 3b), otherwise 2 or 4 (depending on the lacing of the Jacquard machine) billets will be half as much as the calculated value.

 Next, the hollow woven multilayer billet is removed from the machine, refined (weaving defects are eliminated), cut along the axis AA (Fig. 2), it is checked for compliance with the calculated data and the geometric contour of the billet (the latter by fitting to the mandrel).

Claims (1)

 A METHOD FOR PRODUCING A HOLLOW MULTI-LAYERED WOVEN BASED, which consists in the fact that the main threads are woven on a weaving machine with the installation of a filling line, form the upper and lower multilayer woven fabrics, connect them together by transferring the weft threads from one layer of the upper fabric to a similar layer of the lower fabric and form at least one segment-shaped section by changing the number of canvases participating in the dressing, characterized in that, in order to improve the quality of the resulting blanks by lichenie euqal structures arcuate portions segmental sections chord segmental portions arranged parallel to the filling line and each segmentooobraznogo forming portion is performed with a minimum width fueling by inserting warp yarns webs to obtain maximum width of refueling and subsequent withdrawal of warp yarns to produce a minimum width refueling.

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