Method of fabrication of metal hose for under water communications

FIELD: machine building.

SUBSTANCE: invention refers to production of flexible metal hoses. According to the method first a set of parts is prepared; the set is composed out of not upset or partially upset by length and transverse corrugated chamber with flat end, of wire braiding, of bearing sleeves and of external rings and cartridges. Further the hose is assembled, in the process of which the flat ends of the corrugated chamber are arranged coaxially between the external end and the bearing sleeve and connected between them by contact seam welding. The corrugated chamber is covered from outside with wire braiding. The ends of braiding are arranged coaxially between the external cartridge and the bearing sleeve and welded to each other. The feature of the method is the following: before assembly the corrugated chamber taken from the prepared set is subject to complete upset by length, while coating the corrugated chamber with braiding, coaxial arrangement of its ends between the external cartridge and the bearing sleeve, and connecting ends by welding is performed while the corrugated chamber is compacted with axial force value of which is determined out of expression: where: H is maximal depth of hose submersion during operation, m, γ is density of water, g/cm3; Dy is internal diametre of the corrugated chamber, cm, h is height of corrugation profile, cm.

EFFECT: increased life of metal hose under condition of under water operation.

5 dwg

 

The invention relates to the manufacture of flexible metal hose for underwater communications, which can be widely used in systems of deep-sea submersibles and submarines.

Known prototype method of manufacturing metal hose, in which initially prepare a kit of parts made up of newsagency or partially upset (contiguous) in length transversely corrugated camera with plain ends, wire braid, bearing bushings, outer rings and glasses, and then assemble the hose, in which smooth the ends of the corrugated camera set coaxially between the outer ring and the bearing sleeve and is connected between a pin seam welded and corrugated camera cover on the outside of the wire braid, the ends of which are set coaxially between the outer glass and the supporting sleeve and connected to each other by welding (Aigroup, Imogin, Vigiani. Flexible metal hose. Publishing house "engineering", M. 1970, str, Resv).

However, metal hose made in accordance with the method of the prototype, short-lived in terms of underwater operation, when the ratio between the pressure inside the hose P and the ambient pressure POCDmay change periodically from R<POCDto R>R OCD.

In the operation of the hose when R<ROCDthere is a shortening (30%) of the hose from the compression of the shirred camera external pressure that causes simultaneously:

- plastic deformation of the profile of the corrugation;

- lag (swelling) of the braid from the camera.

With the transition of the hose in the operation mode, when R>POCDits length is fully restored at the expense of stretching the corrugated chamber internal pressure, which causes simultaneously:

- plastic deformation of the profile of the corrugation;

- restoring contact braid with the camera.

Periodically repeated cycles of tension and compression corrugated camera with plastic deformation of the profile of the corrugation, as well as a significant cycle braid cause rapid destruction of the hose. Therefore, the durability of the hose produced by the method prototype void underwater operation.

The proposed method of manufacturing aims at improving the durability of the metal hose underwater operation.

This object is achieved by a method of manufacturing a metal hose for underwater communications, in which initially prepare a kit of parts made up of newsagency or partially upset by the length of the transversely corrugated Cam the market with plain ends, wire braid, bearing bushings, outer rings and glasses, and then assemble the hose, in which smooth the ends of the corrugated camera set coaxially between the outer ring and the bearing sleeve and is connected between a pin seam welded and corrugated camera cover on the outside of the wire braid, the ends of which are set coaxially between the outer glass and the supporting sleeve and connected to each other by welding. Unlike existing corrugated camera, taken from the prepared set, put before the full Assembly settling in length, and the coating corrugated camera braided, coaxial with the installation of its ends between the outer glass and the supporting sleeve, a connection between the welding is performed with compressed corrugated chamber axial force, the value of which is determined by the formula:

where N is the maximum depth of the hose in operation, m;

γ is the density of water, g/cm3;

Dy- inner diameter corrugated camera, sm;

h - the height of the corrugation profile, see

Increase durability of metal hose underwater operation is achieved:

1. Complete corrugated settling chamber, taken from the prepared set, which prevents shortening of the Atiyah external pressure, eliminates the plastic deformation of the profile of the corrugation and the gap (swelling) of the braid when operating in mode R<ROCD.

2. Connection (welding) braid outer glass and the supporting sleeve that is executed when the compressed corrugated chamber axial force determined from the above formula that prevents elongation of the hose from the internal pressure, eliminate the plastic deformation of the profile of the corrugation in the operation of the hose in the mode of R>ROCDand also dramatically increases the radial stiffness of the hose to the external pressure when operating in mode R<ROCD.

The list of graphics:

Figure 1 - full corrugated settling chamber;

Figure 2 - connection of corrugated camera with fittings;

Figure 3 - compression of the shirred camera axial force;

Figure 4 - installation of wire braid and glasses (assembled hose);

5 is a hose after Assembly.

Implementation of the proposed method of manufacturing a metal hose for underwater communications by sequential execution of the following operations.

Operation 1. Preparation of a kit of parts for Assembly. Prepare the necessary set of parts that are comprised in the range from newsagency or partially upset by the length of the transversely corrugated camera 1 with plain ends, wire'opale is Ki 2, bearing sleeves 3, the exterior of the cups 4 and ring 5.

Step 2 (Figure 1). Complete corrugated settling chamber. Corrugated chamber 1 is subjected to the full settling, for example, in table 6 press with the use of the pressure rod 7 and the thrust bearing 8. Corrugated camera after separation - see item 9.

Step 3 (Figure 2). The connection of corrugated camera with accessories. Smooth the ends of the corrugated camera 9 is set coaxially between the outer ring 5 and the bearing sleeve 3 and is connected between a pin seam welding.

Step 4 (Figure 3). The corrugated compression chamber of the axial force. Corrugated camera 9 is mounted on the smooth rolling pin 10 with the screw shaft is subjected to axial compression, for example, through the plungers 11 calibrated by tightening the nut 12 with the axial force Q, defined by the formula:

where N is the maximum depth of the hose in operation, m;

γ is the density of water, g/cm3;

Dy- inner diameter corrugated camera, sm;

h - the height of the corrugation profile, see

Operation 5 (Figure 4). Install wire braid outer glass on the support sleeve (final step). Perform when compressed (see step 4) corrugated camera. Corrugated chamber 9 is covered on the outside with a wire braid 2, the ends of which are set coaxially between the outer the glass 4 and the bearing sleeve 3 and connected to each other by welding 13.

Made so metal hose after the liberation from the rolling pin 10 shown in figure 5.

An example of manufacturing a metal hose with an inner diameter of Dy=100 mm for use in freshwater areas (γ=1 g/cm3) at a depth H≤400 m Material details : steel 12X18H10T.

Operation 1. Was made a kit of parts for assembling a hose item:

not upset by the length of the 2-layer (S=2×0.2 mm) corrugated camera 1 Dy=100 mm with plain ends and parameters of the corrugation: t0=6.4 mm and h0=7.2 mm (1 piece);

double - layer mesh braid 2 wire ⌀ 0.5 mm (1 piece);

- supporting sleeve 3 (2 pieces);

- the outer Cup 4 (2 pieces);

- ring 5 (2 pieces).

Step 2. Produced full rein back corrugated camera in length. Corrugated camera 1 was placed on the push rod 7 with the thrust bearing 8, mounted on the table 6 press and produced full rein back (figure 1). After complete separation (item 9) the height profile of the corrugations is increased to h=8,8 mm

Step 3. Produced connection corrugated camera with accessories. Smooth the ends of the corrugated camera 9 installed coaxially between the ring 5 and the bearing sleeve 3 and connected between a pin seam welding (figure 2).

Step 4. Produced corrugated compression chamber axial force (figure 3). Corrugated chamber 9 with ReportName parts 3 and 5 of the valve was put on smooth rolling pin 10 with the screw shanks and subjected to axial compression through the plungers 11 calibrated by tightening the nut 12 with the axial force Q, which was determined by the formula:

where H=400 - maximum immersion depth of the hose in operation, m;

γ=1 g/cm3- the density of water,

Dy=10 cm inner diameter corrugated camera;

h=0,88 cm - the height of the corrugation profile.

Operation 5 (final). Installation wire braid outer glass on the support sleeve. Performed when compressed (see step 4) corrugated camera. Corrugated chamber 9 is covered on the outside with a wire braid 2, the ends of which are installed coaxially between the outer Cup 4 and the bearing sleeve 3 and connected between a welding 13 (see figure 4).

Made in this way, the sample metal hose after the liberation from the rolling pin (figure 5) were subjected to the crimping chamber by external pressure corresponding to the water pressure at the depth of 400 m (40 kgf/cm2). By varying the pressure in the cavity of the hose, provided the cyclic change of operation modes from P<ROCDto R>ROCD.

In these operating conditions, the durability of the sample hose exceeded 10,000 cycles changes the operation mode that surpasses the durability of the hose produced by the method prototype.

A method of manufacturing a metal hose for underwater communications, during which the initially sentence is avleat kit, composed of not upset or partially upset by the length of the transversely corrugated camera with plain ends, wire braid, bearing bushings, outer rings and glasses, and then assemble the hose, in which smooth the ends of the corrugated camera set coaxially between the outer ring and the bearing sleeve and is connected between a pin seam welded and corrugated camera cover on the outside of the wire braid, the ends of which are set coaxially between the outer glass and the supporting sleeve and connected to each other by welding, characterized in that the corrugated camera, taken from the prepared set, put before the full Assembly settling in length and floor corrugated camera braided, coaxial with the installation of its ends between the outer glass and the supporting sleeve, a connection between the welding is performed with compressed corrugated chamber axial force, the value of which is determined by the formula

where N is the maximum depth of the hose in operation, m;
γ is the density of water, g/cm3;
Dy- inner diameter corrugated camera, cm;
h - the height of the corrugation profile, see



 

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