SU1370163A1 - Method of obtaining tubular woven fabric - Google Patents

Abstract

The invention relates to methods for making woven tubular products and allows for the expansion of the range by obtaining products with a multidirectional structure. The method of obtaining such a product consists in interlacing the ppetle machine of two groups of threads on a surface of a mandrel along a sinusoidal path with radial movement within a sector with a central angle (/ over a closed sinusoid with variable amplitude, the value of which is proportional to the distance of the thread to the axis of the mandrel, while n, where n is the number of radial rows of threads 13 Il.

Description

with

The invention relates to the manufacture of products with a multidirectional structure and may find application in the manufacture of large-sized products based on composite materials, where isotropic preforms based on fibrous materials for synthetic resins, pitches, pyrocarbon, etc. are used as sai OTOBOK

The purpose of the invention is to expand the range by obtaining products with a multidirectional structure.

Fig, 1 shows the location of the filaments in the initial position; “And FIG. 2-7 shows the position of the filaments in the process of successive radial displacement and rotation at a fixed angle Lf

 360 °

p, where n - the amount of radii - 20

general rows of threads; Fig. 8 shows the trajectories of two threads when arranged in groups of two concentric layers of threads and the number of groups 2, the number of radial rows of threads 8; FIG. O9 shows the trajectories of a single point with the number of groups 4 and the number of concentric layers of threads in group 2; Fig. 10 shows the orientation of the threads in the product when the method is implemented; on fig - the trajectory of the thread in the product in one cycle (until the thread returns to the outer surface of the product in

In phase D (figob), odd radial rows of threads are shifted to the center

initial section); Fig. 12 shows the straight trajectory of the thread (located -jg on one concentric row, even-lived thread) in the presence of 4 groups from the center.

In phase E (), the groups of concentric surfaces are rotated again in the initial directions

As a result of repeated cycles, the thread describes curved paths and, before returning

concentric surfaces and arrangement in a group of 2 concentric layers of filaments; FIG. 13 is a projection on a tangent to a line, connecting the initial initial position to

final position in the cycle, the trajectory of the thread in one cycle

When describing a sequence diagram, we take: the extreme concentric surfaces of the threads — surfaces formed by a sector with an angle that are directly proportional to the inner and outer stationary quadrupled angle of rotation by concentric incomplete rows; a fixed angle tf 360: n, where the threads are; the group number is the group of con n - the number of radial rows (in the centric surfaces from the outer

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fixed concentric layer of filaments; the number in the group is a concentric layer of threads in the group with reference to the outer concentric layer in the group; the first digit in the numbering of the filaments denotes the radial series in the initial position, the second digit after the point - the number of the concentric layer of the filaments in the initial position; sequential position of the threads (Fig, 8.9 and

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sector); in the sector, two sinusoidal curves symmetrical with respect to the bisector of the angle with an amplitude proportional to the distance to the axis, and in the axial direction in the indicated sector form sinusoidal cyclically repeating planes,

As a result of the analysis of the cyclograms of the movement of the threads (Figures 1-13), four groups of threads can be distinguished, which

11-13) are designated by figures, letters are designated concentric surfaces,

In the initial position (phase A), the position of the filaments corresponds to, where the odd radial rows of the filaments are shifted to the center by one concentric layer with respect to the odd ones,

In phase B (FIG. 3), the extreme incomplete concentric layers of the threads, arranged in a checkerboard pattern, are fixed, the threads of odd groups of concentric surfaces are moved clockwise to adjacent radial rows (in our case, the outer group of 2- x concentric surfaces), even groups - counterclockwise to adjacent, radial rows about

In phase B (FIG. 4), the odd radial rows of the threads shift one concentric layer from the center, even to the center one concentric layer

In phase D (FIG. 5), the outermost (outer and inner) incomplete concentric layers of the threads are fixed, the first group (odd) of the concentric layers of the threads moves clockwise to adjacent radial rows, the second group (even) goes counter-clockwise arrows on adjacent radial rows

In phase D (figob), odd radial rows of threads are shifted to the center

in its original position forms

 a sector with an angle that is directly proportional to a quadruple angle of rotation, a fixed angle tf 360: n, where n is the number of radial rows (in

 a sector with an angle that is directly proportional to a quadruple angle of rotation, a fixed angle tf 360: n, where n is the number of radial rows (in

sector); in the sector, two sinusoidal curves symmetrical with respect to the bisector of the angle with an amplitude proportional to the distance to the axis, and in the axial direction in the indicated sector form sinusoidal cyclically repeating planes,

As a result of the analysis of the cyclograms of the movement of the threads (Figures 1-13), four groups of threads can be distinguished, which

ry move in four different directions:

- clockwise and from the center

- clockwise and to the center;

- against the hour hand and from the center;

- against the hour hand and towards the center.

As a result of constructing the trajectory of the thread in the product, it can be seen that from point 1 and 2 the thread moves (oriented in the product) clockwise and to the center, at points 5 and 6 the thread rotates counterclockwise and to the center, at points 9 and 10 the thread turns back clockwise and to the center, at points 13 and 14 the thread turns counterclockwise and to the center, then passes through the axial plane ЕОО Е (bisector) at points 17-20, continues to move counterclockwise changes direction and moves from center to points 23, 24 and gave its thread changes the direction of movement clockwise and continues to move from the center, at points 27 and 28 the thread changes direction and moves counterclockwise from the center, at points 31 and 32 the thread changes the direction of movement and moves clockwise from the center, and having reached points 35 and 36, goes over the plane of the bisectrix and, continuing to move clockwise, changes direction and moves to the center. When examining the trajectory of movement along the axis (Fig. 13), it is seen that the thread describes a sinusoidal trajectory amplitudes of which is proportional to the distance from the filament to the axis arrangement.

As can be seen from this analysis, the thread simultaneously describes four trajectories (four directions), therefore, when implementing the method, a product with multidirectional

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structure, the threads of the same name describe curvilinear trajectories in a limited sector.

The proposed method allows to obtain large-sized products with a limited amount of equipment, since the threads that need to be placed on one concentric surface are arranged in several, which allows to expand technological capabilities, increase the range of products with multidirectional structure, including orientation in a limited sector, t „eo it is possible to lay the required threads in the required sectors and at the same time get a monolithic product with a multidirectional structure. ozvol vfabatyvat article is unbounded size equipment with limited dimensions

Claims (1)

Invention Formula A method of producing a tubular braided article consisting in interlacing at least two groups of threads on the mandrel surface by moving these groups in mutually opposite directions along a closed sinusoidal trajectory with radial and circumferential movement, in order to expand the range by obtaining products with multi-directions - a lazy structure, the radial movement of each filament is carried out within the sector with a central angle if if a closed sinusoid with a variable amplitude, led wherein the rank of the thread is proportional to the distance to the axis of the mandrel, and the angle q defined by the formula  1/360 °: n, where n is the number of radial rows of threads. Initial position FIG. g Phase A Phase B Fig.Z Phase B Fy FIG 5 FIG. AT Phase G Phase L FYZY E FIG. 7 FIG. 9 Jff-ok FIG. 9 FIG. W C 35.36 FIG. eleven FIG. 12 Editor M.Nedoluzhenko Compiled by A. Golant Tehred M. Khodanych FIG. fJ Proofreader O. Kundrik