RU2367835C1 - Manufacturing method of polymerous hose in two cellular braiding - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention relates to method of manufacturing of reinforced by metal braid polymerous hoses. Polymerous chamber is forced on burnisher and coated by two located one on another layers of cellular braiding, herewith strand of each braiding is directed to crosshair, interlaced to each other and laid into hose by helical line, herewith correlation between values of helix angle to longitudinal axis of hose at laying of strand in braidings of the first and the second layers, inclination θ, θ₁ at laying of strands of the first layer is assigned in the range 0<θ₁<55°44, and corresponding to it inclination θ₂ at laying of stands of the second layer is assigned from condition of balance of braidings by formula:

where m₁ and m₂ - packaging density of wires in braidings of the first and the second layers; d₁ and d₂ - diametres of wires in braidings of the first and the second layers correspondingly; E₁ and E₂ - modulus of elasticity of material in braidings of the first and the second layers correspondingly; t - wall thickness of polymerous chamber; D_d - burnisher diametre.

EFFECT: rising of hydrostatic strength of hose.

Description

The invention relates to methods for manufacturing polymer-reinforced metal braids, for example fluoroplastic, hoses for aircraft, vehicles and industrial equipment.

A known prototype method of manufacturing a hose in two mesh braids from wire strands (K. Evans. Sleeve technology. Translation from English. Moscow. Chemistry Publishing House, 1978, p. 15; p. 47; p. 93), during which the rubber chamber is mounted on the mandrel and covered with two layers of mesh braids placed on each other, while the strands of each of the braids are guided crosswise, intertwined and laid on a hose along helical lines with equilibrium angles of inclination to its longitudinal axis: θ ₁ = θ ₂ = 54 ° 44 '.

However, the hydrostatic strength of the polymer hose in two mesh braids made using the prototype method is minimal for reasons:

- equality of equilibrium angles in the braids of the first and second layers θ ₁ = θ ₂ = 54 ° 44 ';

- the lack of optimal ratios for the diameters of the wires and the elastic moduli of their materials between the braids of the first and second layers.

The proposed method of manufacturing a polymer hose in two mesh braids is aimed at increasing its hydrostatic strength.

The problem is achieved by a method of manufacturing a polymer hose in two mesh braids from wire strands, during which the polymer chamber is mounted on the mandrel and covered with two layers of mesh braids arranged on top of each other, while the strands of each of the braids are cross-wound, intertwined and laid on the hose along helical lines. Unlike the existing method, strands of the first and second layers are laid on the hose along helical lines with angles of inclination to its longitudinal axis, the values of which are established from the relations:

0 <θ ₁ <54 ° 44 '

where: θ ₁ and θ ₂ are the values of the angles of inclination of the helical lines to the longitudinal axis of the hose when laying the strands in the braids of the first and second layers, respectively;

m ₁ and m ₂ - the density of the laying of wires in the braids of the first and second layers, respectively,%;

d ₁ and d ₂ are the diameters of the wires in the braids of the first and second layers, respectively, mm;

E ₁ and E ₂ are the elastic moduli of the material of the wires in the braids of the first and second layers, respectively, kgf / mm ² ;

t is the wall thickness of the polymer chamber, mm;

D _d - the diameter of the mandrel, mm

The proposed method also has other differences, namely, that:

- the strands in the braids of the first and second layers are made of wires, the diameters of which are related to each other as:

- the strands in the braids of the first and second layers are made of wires, the elastic moduli of the materials of which are related to each other as:

Increasing the hydrostatic strength of the polymer hose in two mesh braids is achieved:

1. A new ratio between the values of the angles of inclination of the helical lines to the longitudinal axis of the hose when laying the strands in the braids of the first and second layers. In this case, the angle of inclination θ ₁ when laying the strands of the first layer is assigned within 0 <θ ₁ <54 ° 44 ', and the corresponding angle of inclination θ ₂ when laying the strands of the second layer is determined from the equilibrium condition of the braids as a whole according to the formula:

2. The optimal ratio between the diameters of the wires in the strands of braids of the first and second layers, reinforcing the positive effect (d ₂ / d ₁ ≤1).

3. The optimal ratio between the elastic moduli of the materials of the braids of the first and second layers, reinforcing the positive effect (E ₂ / E ₁ ≥l).

The list of graphic images:

Figure 1. Operation number 1. Mounting a polymer chamber on the mandrel.

Figure 2. Operation number 2. Covering the polymer chamber with a first mesh layer.

Figure 3. Operation number 3. Coating the polymer chamber with a second mesh layer.

Implementation of the proposed method of manufacturing a polymer hose in two mesh braids from wire strands is carried out by the sequential execution of the following operations.

Operation No. 1 (figure 1). Mounting the polymer chamber 1 (tubes with dimensions D _d × t) on the braid mandrel 2 with a diameter of D _d ; feeding the mandrel with the camera into the braiding machine.

Operation No. 2 (figure 2). Covering the polymer chamber 1 with the first layer of the mesh braid 3. The strands of the braid are made of wires with a diameter of d ₁ and a modulus of elasticity of the material E ₁ . The angle of inclination θ _{1 of the} strands of braid is set within

0 <θ ₁ <54 ° 44 'and provide adjustment of the braiding machine.

Operation No. 3 (figure 3). The coating of the polymer chamber 1 with the second layer of the mesh braid 4. The value of the angle of inclination θ _{2 of the} strands of the braid is set depending on the value of the angle of inclination θ ₁ (see operation No. 2) by the formula:

and provide tuning braiding machine. In this case, the braid strands are made of wires, ensuring the following ratios:

Operation No. 4. Removing the finished hose from the braid mandrel. Three examples of the implementation of the proposed method for the manufacture of a hose D _y = D _d = 18 mm with a polymer chamber in the form of a fluoroplastic tube with dimensions D _y × t = 18 mm × 1.35 mm are presented (see Table 1-3).

The density of the braids of the first and second layers is assumed to be the same (m ₁ = m ₂ = 85%).

Equipment used in the implementation of the method: braiding machine "Unidra-32" (32 strands); braid mandrel D _d = 18 mm.

The sequence of implementation of the method shown above.

From the shown embodiments of the proposed method for the manufacture of a polymer hose in two mesh braids, it can be seen that:

1. The hydrostatic strength of the hose is minimal at equilibrium angles of inclination of the strands in both braids, i.e. at θ ₁ , = θ ₂ = 54 ° 44 '.

2. The hydrostatic strength of the hose clearly increases with decreasing angle θ ₁ , subject to the relations:

θ <θ ₁ <54 ° 44 '

In this case, the positive effect (P _max / P _min ) achieved in the shown examples is enhanced if the ratios are satisfied for the braiding wires:

The proposed method of manufacturing a polymer hose in two mesh braids provides a significant increase in its hydrostatic strength.

Claims (3)

1. A method of manufacturing a polymer hose in two mesh braids from wire strands, during which the polymer chamber is mounted on the mandrel and covered with two layers of mesh braids arranged on top of each other, while the strands of each of the braids guide the crosshair, intertwine and are laid on the hose along a helical line, characterized in that the strands of the first and second layers are laid on the hose along helical lines with angles of inclination to its longitudinal axis, the values of which are established from the relations:
0 <θ ₁ <54 ° 44 '

where θ ₁ and θ ₂ are the values of the angles of inclination of the helical lines to the longitudinal axis of the hose when laying the strands in the braids of the first and second layers, respectively;
m ₁ and m ₂ - the density of the laying of wires in the braids of the first and second layers, respectively,%;
d ₁ and d ₂ are the diameters of the wires in the braids of the first and second layers, respectively, mm;
E ₁ and E ₂ are the elastic moduli of the material of the wires in the braids of the first and second layers, respectively, kgf / mm;
t is the wall thickness of the polymer chamber, mm;
D _d is the diameter of the mandrel, mm. 2. The method according to claim 1, characterized in that the strands in the braids of the first and second layers are made of wires, the diameters of which are related to each other, as:

3. The method according to claim 1, characterized in that the strands in the braids of the first and second layers are made of wires, the elastic moduli of the materials of which are related to each other, as:

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