SU1590495A1 - Antifriction material - Google Patents

Abstract

The invention relates to the textile industry, in particular, to materials of technical designation, having anti-friction properties, intended for use in units of friction of mechanisms and muscles that work without lubrication, as well as in an aggressive environment, and allows to increase the wear resistance of an anti-friction material. The front side of the antifriction material is made of polytetrafluoroethylene yarns and is connected by pressure weft through 3-5 threads of the base with the wrong side, the edges have a thickness 30-50% less than the thickness of the material, and the ratio of the densities of the main threads to the weft face is (1 , 75-2.25): 1, with a mass ratio of polytetrafluoroethylene filaments and filaments of the seamy side (65-75) :( 35-25)%, high modulus heat-resistant filaments based on heterocyclic polymer are used as the basis of the seamy side, and Rhone consist of multifilament yarns 2-6 additions. 2 hp ff, 4 ill., 2 tab.

Description

The invention relates to the textile industry, in particular to materials of technical designation, having anti-friction properties, intended for use in units of friction of mechanisms and machines that operate without lubrication, as well as in an aggressive environment.

The purpose of the invention is to increase the wear resistance of the antifriction material.

FIG. 1 shows an antifriction material, a general view; 2-4 the same, cross sections.

The material (Fig. 1) contains the front side A, the base 1 of which is made of polytetrafluoroethylene yarns (PTFE). The inner side B has a base of 3 high modulus heat resistant yarns. Weft yarns 2 are also made of PTFE and are joined to the front and back sides.

The front side should have the lowest possible coefficient of friction, inner side - maximum adhesion to the bearing material of the friction unit. The hem of both sides is made of PTFE yarn. An increase in the wear resistance of the antifriction material is provided by its structure.

FIG. 2-4 shows cross sections of the material of one and a half layer weaves based on twill 2/1 1/2. 3/1 -1/3 and atlas 5 / 2-3 / 5, respectively, with the front side 1, weft 2 and edge 4 yarns made of PTFE, and the seamy side is made of high modulus-3 threads.

The weft thread 2 can connect (Fig. 2) three weaving yarns, including one front side thread and one thread, four weaving yarns (Fig. 3), D including three front side threads 1 and one

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Thread the purl 3, and can connect five weaving yarns (Fig. 4), including four threads of the front side 1 and one purl 3.

Each side of the material is formed by threads of a constant linear density. For the front side of the base, PTFE yarns of 33.3 tex are used, and for the back side, yarns 29 and 58.8 dachshunds. On the basis of the structural features and types of raw materials of the front and back. Sides, variants of the material have been developed, such as tapes with a width U-BSUMmm. The ratio of the densities of the covered with the warp threads and the weft of the face (antifriction) side is {1.5-2.5): 1, and the weight ratio of the PTFE threads of the face to the threads of the wrong side (59-81} :( 41-19)% .

The material with a density ratio of the core thread to the weft front side is (1.75-2.25): 1 at a mass ratio of PTFE threads to the threads on the wrong side (65-75) :( 35-25)%, has good uniform staining on both sides without signs of penetration of threads from one side to the other side. A change in the ratio of the mass content of one of the systems of the filaments within 5% of the upper and lower limits leads to disruptions in the structural integrity of both sides, expressed in the penetration of the filaments of one side into the other. With a decrease in the content of threads on the front side of the thread on the wrong side, they pierce its side, and with an increase in the content of the threads on the front side, the threads penetrate the surface of the wrong side. Material with obvious violations of the front or back sides reduces the operational properties of the product. In the first case, there is a rapid rubbing of the protrusion, their filaments on the wrong side, and in the second, the strength of adhesion to the carrier material decreases. Mitya seamy side used in the proposed material based on heterocyclic polymer, provide the best elastic and dynamic characteristics of antifriction product, which is made on the basis of the proposed material. The high resilience of the material is ensured by using Hillet in the seamy side with a modulus of 10,000-13,000 kg / mm as compared with the known material, the threads of which have a modulus of 100-200 kt / mm. Thus, during testing, the antifriction liner on the basis of the proposed 1ter tal at a liner thickness of 0.8 mm hardens 0.1 mm during repeated application of a load of 1.5–4.0 kg / mm, while at the same time from the fabric, according to the structure of known materials, it makes shrinkage of 0.3-0.5 mm, which

This is explained by the high density, structural connections of the layers and materials on the wrong side of the material proposed.

In tab. 1 shows the main parameters of the production options (refills) of an antifriction material such as a tape. . . In version 1, the durability of the front side is less due to the appearance on it of the threads on the wrong side with low resistance to wear. Option 1 is not suitable for wear-resistant construction.

Variants 2-4 of material production provide an even décor on each side and increase the strength of the bone.

In the manufacture of material for option 5, the threads of the front side penetrate into the wrong side, which leads to a deterioration in adhesion to the base material of the tren; / 1. Option 5 cannot be used for crafting. wear resistant antifriction product. Thus, the best products are those obtained from warrants 2-4.

The front and back sides are joined using weft yarns made of PTFE yarns in one and a half layer weave: twill type 2/1 X X1 / 2, 3/1 1/3, 4/1 1/4; satin bindings 5/2 -3 / 5.5 / 3 -2/5, wrong 4-thread atlas, etc.

The above weaves make it possible to obtain an even zastil of the front and seam sides, to make a tight weft connection, to ensure weft filling within 40-60% of the front side threads, which ensures uniform wear of the friction surface of the product for the same number of cycles (0). , 08-0.1 mm).

The use of weaving with weaving of a weft more than 5 threads on the basis of such as twill 5 / 1-1 / 5.6 / 1-1 / 6 and so on in a half-strand interlacing results in elongated overlaps (2.5-3.5 mm ), the sides are friable and due to the threads of the seamy side they penetrate to the antifriction (front) side. The durability of the product get less (0.3-0.5 mm).

The twill 2 / 1X X1 / 2.3 / 1 1 / Zi 4 / 1-1 / 4iatlas / 5 / 3-2 / 5 twisted satin material has an irregular 4-thread atlas and has more specific characteristics than the others.

The weaving thread of the front side A consists of 2-6 complex yarns, and the yarn of the backing layer B is 1-4 yarns. The weft, the transition from the surface to the surface through 3-5 threads, provides a reliable connection of the warp threads of both surfaces, grouping them together.

In the case when a weaving thread cuts a single complex thread, it is in the process of forming a material (for example, a ribbon) on a weaving loom, felted, shaggy. The latter has a negative effect on the wear resistance of the product (0.5-0.7 mm). When a weaving yarn consists of 2-6 complex yarns, it has a good processing ability, retains its properties during processing and provides a uniform smooth closure. In this case, satisfactory wear resistance of the product (0.1 mm) is achieved.

With a further increase in the number of complex yarns in a weaving yarn, its compactness is broken, and it is difficult to process it. The wear resistance of the friction surface in the product increases and is 0.25-0.30 mm.

The effect of the ratio of the densities of the underlying filaments to the weft face and the number of additions of the filaments in its filaments is described in Table. 2

In the production of material with full zastilom one type of raw material on the sides there is waviness, notches. This is unacceptable, since the edges in the formation of a friction product do not fit well and the adhesive composition penetrates the surface of the friction. The formation of the overlap product leads to the appearance of an increased thickness of the helix - the joint.

To eliminate these drawbacks in the proposed material, the edges are

1-2 mm wide of PTFE mitium with a thickness of 30-50% less than the thickness of the middle section of the material, which provides antifriction 5 elements of constant thickness in the cross section.

Claims (3)

1. Antifriction material, having a front side, made of polytetrafluorostille warp and weft threads, connected by presser weft threads to the reverse side, characterized in that, in order to improve wear resistance, the front and back sides are attached to the presser weft after 3-5 warp threads, the edges have a thickness 30-50% lower than the material thickness, and the density ratio of the base threads of the if 20 weft face is (1.75-2.55): 1 at a mass ratio of polytetrafluoroethylene threads and purl st oorona (65-75) :( 35-25)%, prs: this is the basis of the wrong side 25 high modulus heat resistant yarns are applied. 2. Material according to Claim 1, characterized in that the front side threads consist of 2-6 folds of complex threads. thirty 3. The material under item 1, which is different. that as a high-modulus, heat-resistant yarns, yarns based on a heterocyclic polymer are used. CD H s e; Yu flj table 2 J / Itza c / 77ff ff // o - / I / JOL / l / J // Of fft /// G C / 7ff / ff // Gf-i FIG. one about V; r f i x 1 2 3 i: J 2 f -f . 1 I g a 3 3 Fugz Jjr jt W 9 8 7 five II gk zh chi si Ltd " FIG. 1 2345