High-pressure plastic-coating metallic vessel and method of its manufacturing

FIELD: pressure vessels.

SUBSTANCE: plastic-coating metallic vessel comprises outer load-bearing plastic shell and inner thin-walled welded steel shell whose intermediate section is cylindrical, two bottoms, and connecting pipe. The connecting pipe and at least one of the bottoms are made in block. The method comprises rolling out the rod from its one end thus defining the flange having flat circular surface from one side, working the unrolled section of the rod to form the outer surface and inner passage of the connecting pipe, rotating tension of the flange, moulding the bottom of a given shape, connecting the bottom to the intermediate cylindrical section, and welding the parts.

EFFECT: reduced labor consumption.

4 cl, 3 dwg

 

The invention relates to the field of gas equipment, namely, metal cylinders high pressure (HP)used, in particular, in portable oxygen breathing apparatus climbers, rescuers, in portable products cryogenic and fire-fighting equipment, systems of gas supply.

Currently released plastic cylinders high pressure (HP) contain internal thin-walled metal hermetic shell - liner and the external power plastic shell formed by winding on the surface of the liner harness from high modulus fibers such as glass fiber, carbon fiber, organic fiber)impregnated with a binder.

Among the requirements for gas cylinders VD, priorities are the reduction of the specific consumption of materials (d) of the cylinder defined by the ratio of the weight of the container to its volume, and ensuring high resource by the number of loading cycles in the safe operation of the balloon.

The first of the specified requirements, in particular, respond well known plastic cylinders with welded and forged-welded steel lanarama that contains a middle cylindrical part and welded to two of the bottom, at least one of which with fitting connected with a bottom weld seam.

Known, taken as a prototype of the, plastic container VD in patent RU, C1 2077682 contains forged-welded sealed steel liner and outer strength plastic shell.

The liner contains a middle cylindrical part, two bottoms and has a wall thickness equal to (0.5-0.9) mm Plate connected to the middle part by means of welding through slip rings, which provide a smooth exterior surface of the liner in place of the weld. At least one of the bottoms welded fitting.

Plastic container VD in patent RU, C1 2077682 made as follows.

For the manufacture of liner used steel blank of thin sheet metal. The cylindrical part of the liner is produced from sheet steel billets, rolled up into a cylinder and welded butt joint, for example, electron-beam welding. Bottoms have a known cold-drawing from the same sheet metal. In this case, since the depth of the bottoms small, usually not more than 0.32 outer diameter (30 mm), the thickness after drawing commensurate with the thickness of the cylindrical workpiece. The bottom perimeter welded to the cylindrical part through slip rings. At least one of the bottoms weld fitting. When this is used, for example, electron beam or laser welding.

As a plastic outer shell use harness Armos, which is first wound on the liner, using, as in known constructions, the spiral radially-diagonal winding, which is carried on the well-known equipment, for example on the machine DPR.

At the same time to maintain the shape of the liner in the process of winding the wall thickness of the liner shall not be less than 0.2-0.5 mm

Welded, forged-welded technology to produce steel laneri with relatively thin walls, and thereby to provide a relatively low specific consumption of materials (d) of the container.

However, the known designs of plastic bottles VD welded or forged-welded steel lanarama have relatively low resource by the number of loading cycles due to possible buckling and fracture of the liner in the area of the weld joint of the bottom and fitting.

In the known welded and forged-welded steel lanero providing relatively low specific consumption of materials (d) cylinder VD (with respect to the wall thickness of the liner to its diameter in the range of 0.003 to 0.01), the thin plate is connected to the fitting by welding.

Fitting compared to the thin-walled bottom represents massive site that prevents a single detail, includes fitting and thin the bottom of the well known methods, such as turning. Not known to the authors technologically advanced, the Kie processes, allowing other than welding, to connect massive enough detail - fitting with thin-walled part, the bottom.

The presence of a welded joint at the bottom leads to low resource container VD with a steel liner in the number of loading cycles, which does not exceed a few dozen, due to possible buckling and fracture of the liner in the area of the weld joint of the bottom and fitting.

In addition, the additional operation of the connection fitting to the bottom, as well as the use of additional parts - slip rings, through which the welding of the middle cylindrical part and bottoms, complicates the manufacturing technology for steel cylinders VD.

The present of the invention is to create a plastic cylinder high pressure and method of its manufacture to prevent weld fitting with bottom and thereby increase the stability and strength of the liner and the resource container by number of loading cycles while maintaining a low density material (d) of the container, as well as to simplify the manufacturing process of the cylinder due to the exclusion of the operation of the connection fitting with bottom and additional details slip rings.

The problem is solved in that in the composition of the high-pressure bladder, including vashnu the strength plastic shell and an inner thin-walled steel liner, contains a middle cylindrical part, two bottoms and fitting on at least one plate, according to the present invention, the fitting and the bottom is made in one piece.

Implementation of the bottom liner with fitting in one piece reduces the probability of breakage and buckling of the liner in the area of the fitting, thus provides the possibility of increasing the resource plastic container VD with a steel liner on the number of cycles of loading.

Tests conducted by the authors showed that the exclusion of the welded connection of the fitting to the bottom, allows you to increase the service life of plastic container VD with a thin steel liner on the number of loading cycles up to several hundred. This extra step of welding the bottom with a fitting that simplifies the process.

The most technologically advanced, to the bottom with fitting were made in one piece from a workpiece in the form of rod to use for forming the bottom wall of operations, rolling and rotating hoods, and for the formation of the fitting - turning.

It is advisable that the bottoms were connected to middle cylindrical portion by welding, each of the heads includes a peripheral annular wall section in connection with the middle cylindrical part made by thickening of the wall with the internal one hundred the ons and the annular groove from the outside, forming on the peripheral annular area of the ledge for sitting the middle of the cylindrical part.

Due to the above structure of the peripheral wall section of each plate is provided by welding the bottoms from the middle cylindrical part without slip rings, which simplifies the manufacturing technology of the container VD.

The problem is solved in that in the method of manufacturing a plastic container with pressure steel thin-walled liner that contains a middle cylindrical part and two bottoms, at least one of which contains a socket that includes a connection welded seam middle cylindrical part with bottoms, according to the invention, the bottom and fitting done at one of the blanks in the form of a steel rod of a given size, while the rod is rolled from one end, forming a flange, having on one side a flat circular surface that engages with the opposite side with prasadanam section of the rod, the length of which is sufficient for the formation of the fitting, nerazgadannaja section of the rod by machining to form the outer surface and the inner channel fitting, flange method of turning and rotating extrusion with subsequent forming press to form the bottom of a given shape, which is connected with a middle cylindrical portion,and carry out the welding around the perimeter of their connection.

The proposed method is the most feasible and economical method of manufacturing a cylinder VD, ensuring fulfillment of the bottom in one piece with the fitting while maintaining a low density material (d) of the container.

The proposed method provides a low complexity of the process and economical consumption of metal.

It is advisable to rotary hood on a flat circular flange surface machining to create on the periphery of the flange thickening, which saves on the inner side walls of the bottom after the molding pressure on the outer side walls of the bottom above the thickening perform an annular groove of a given diameter, forming on the peripheral wall section of the bottom ledge, on which is placed the middle cylindrical portion, and carry out the welding.

Peripheral part of the bottom with the tab under the middle cylindrical part is formed to complete the weld without backing rings, which simplifies the manufacturing technology of the container VD.

Further, the invention will be disclosed in more detail with specific examples of its implementation with reference to the drawings, in which:

Figure 1 depicts a plastic container VD, longitudinal section;

Figure 2 - the bottom of the liner cylinder VD, longitudinal section;

Figure 3 - process flow diagram is izgotovlenie the bottom of the liner of the container.

Figure 1 shows a plastic cylinder high-pressure (HP)containing the external power plastic shell 1, an inner thin-walled steel liner 2 and the nozzle 3. External power plastic shell 1 is formed by winding the liner 2 on the entire surface of the solid polymer fibers impregnated with resin. External power plastic shell 1 may be made of any known polymeric material used for this purpose, for example, from harness Armos.

The liner 2 is made of high-alloy corrosion-resistant steel, for example, 12X18H10T and comprises a cylindrical portion 4 and two plate 5 connected to the cylindrical portion 4 along the perimeter of the weld seam 6.

The wall thickness of the liner 2 in the middle part 4 and the bottom 5 are determined from the conditions under which the ratio of the wall thickness of the liner and its diameter is in the range of 0.003-0.01.

This is due to the need to preserve the shape of the liner in the winding process with the minimum specific consumption of materials (d) of the container.

When the fitting 3 and the bottom 5 are made in one piece without welding.

Figure 2 shows the bottom 5 of the liner, made in one piece with the fitting 3 and the United welded seam 6 to the cylindrical portion of the liner 4.

The bottom 5 includes a peripheral ring section 7 in connection with sredneziminskoe part 4, made with a thickening 8 from the inner side walls of the bottom and the annular groove 9 from outer side wall forming a peripheral annular section protrusion 10 for draping the middle of the cylindrical part 4.

On the basis of conditions ensuring the continuity of the weld material, the height of the ring groove 9 may exceed the wall thickness of the cylindrical part 4 of the liner in 1.5-2.0 times. Accordingly, the outer diameter of the bottom 5 is also expected to exceed the outer diameter of the cylindrical part 4 of the liner.

The outer diameter of the bottom 5 in front of the annular groove may also be the same as the external diameter of the cylindrical part 4, and the height of the ring groove 9 to correspond to the wall thickness of the cylindrical part 4 of the liner.

The perform of the bottom 5 of the liner with the fitting 3 in one piece reduces the probability of breakage and buckling of the liner in the area of the fitting, thus provides the possibility of increasing the resource plastic container VD with a steel liner on the number of cycles of loading.

Tests conducted by the authors showed that the exclusion of the welded connection of the fitting to the bottom, allows you to increase the service life of plastic container VD with a steel liner in the number of loading cycles up to several hundred.

The manufacture of the liner is carried out as follows.

For the average cilindric the Russian part 4 of the liner 2 to use the most technologically advanced steel blank of thin sheet metal, which is rolled up into a cylinder, butt weld. It is most preferable to use electron-beam welding.

Figure 3 shows the scheme of the technological process of manufacture of the bottom of the tank, made in one piece with the fitting, as for example shown in figure 2.

For the manufacture of bottoms using the workpiece in the form of a steel rod 11 (Figa), for example of steel 12X18H10T. The diameter of the rod 11 is determined by the largest outer diameter of the fitting, such as fitting 3 in figure 2, taking into account machining tolerances. The length of the rod 11 (Figa) is selected from the conditions for the creation of the flange 12 (Figb), having on one side a flat circular surface 13 that is connected to the opposite side with prasadanam section 14 of the rod. The diameter and thickness of the flange 12 sets of conditions for subsequent processing forming the bottom of a given shape, such as the bottom 5 in figure 2, and the length nerazgadannaja section 13 (Figb) rod must match the length of the fitting, such as fitting 3, shown in figure 2, taking into account machining tolerances. The length of the rod 11 (Figa), providing the above conditions, is determined by well-known by calculation, based on the volume of the workpiece and the machining tolerances of the workpiece.

The source of the workpiece in the form of a rod 11 with one end of the roll to the formation of the flange 12 (f is GB) of a given size, defined, as mentioned above, based on the specified dimensions of the bottom with the fitting.

The rolling rod 11 is carried out either by heating the billet to 1100°for one transition, or without heating of the workpiece for two transitions with intermediate quenching, which is held on the mode: heating up (1050-1070)°C, cooling in water. After operation rolling produce a known manner quenching the workpiece to remove work hardening.

For rolling rod 11 (Figa) using known equipment for rolling elements, for example, can be used to install for forming the forging PX-100. The rolling parameters chosen by well-known methods of calculation effort deformation and limit values of strain.

The next step, shown in Figv is forming fitting 15 of nerazgadannaja section 14 (Figb) and processing of flat circular surface 13 of the flange 12. Both operations are carried out by machining, in particular, turning and milling processing. Lathe and milling machines handle nerazgadannyi section 14 of the rod, forming a set of external and internal surface of the fitting 15 (Pigv), having on the outer surface of the conical section 151and three cylindrical section 152, 153, 154different diameter, and the inner channel 16.

On a flat circular surface 13 flan is 12 choose the thickness, creating on the periphery of the annular thickening 17. The thickness of the flange 12 on the entire surface, an outside peripheral annular thickenings 11 exceeds the specified wall thickness of the bottom and is determined by the opening angle of the cone mandrel (not shown) for rotating the hood. The amount of the thickening 17 on the periphery of the flange 12 is set by the welding conditions of the bottom of the cylindrical part of the liner exceeds the total thickness of the flange 2-3 times.

Further rotation of the exhaust from the flange 12 to form a conical surface 18 (High) with decreasing wall thickness of the conical surface 18 to the desired wall thickness of the bottom. The operation is carried out in a known manner on a lathe (not shown), where the workpiece is fixed on a tapered mandrel with a given angle. The hood is held by a roller (not shown), which runs in the flange face, pushing him to the mandrel. The thickness of the flange is reduced in accordance with the dependence S=S×sinαwhere S - thickness of the flange 12 (Pigv) after machining, S - wall thickness of the cone 18 (High) after rotating hoods, 2α - angle of the conical surface of the mandrel. The Central part of the flange 12 (Pigv), adjacent to the fitting 15, not rolls the roller and the wall thickness of the cone adjacent to the fitting, not decreases, remaining equal to the thickness of the flange 12 (Pigv) to rotary with the LCD. Also does not change the thickness of the peripheral part of the flange. On the conical surface 18 is formed a peripheral annular area 19 with a thickening 17 on the inner side of the wall.

The next operation is the formation of the conical surface 18 (High) bottom 20 (Figd) to the specified profile. This operation is carried out by known extrusion method in a matrix (not shown) of the given shape. While on the peripheral annular area 19 retain the annular thickening 17 on the inner side walls of the bottom 20.

Next on the specified peripheral section 19 of the bottom 20, above the thickening 17, on the outer side walls of the bottom 20 perform an annular groove 21 forming the protrusion 22 on which is placed the middle cylindrical part of the liner and carry out the welding.

The height of the annular groove 21 is equal to the wall thickness of the middle part of the liner or greater than the wall thickness of the cylindrical part of the liner in 1.5-2.0 times.

You can run the bottom without thickening 17 on the inner side and the annular groove 21 on the outer side of the peripheral section 19 of the bottom wall 20. While the bottom 20 and a cylindrical part can be connected through slip rings, as in the known technical solution according to the patent RU, C1 2077682.

It is possible to manufacture preforms for rotating the hood turning of the rod diameter, large diameter, the RA ange. In this embodiment a lot of metal going in shaving and great complexity for turning. It is possible to manufacture rotary extractor plate having a specified shape. This prevents operation of the molding plate. However, this embodiment requires the manufacture of a rotary workpiece under the hood with variable thickness of the flange, the thickness of the flange in the Central part should be equal to the given thickness of the bottom. The manufacturer of this piece is very time-consuming and is associated with the likelihood of a large percentage of marriage.

The following is a specific example of implementation of the bottom to the liner with an outer diameter of 48 mm, intended for plastic cylinder high pressure 40 MPa with life 500 loading.

The original workpiece is a steel rod with a diameter of 20 mm, a length of 51 mm 12X18H10T. The rod is rolled from one end to the education of the flange with a flat circular surface with a diameter of 43 mm, thickness 3 mm, leaving prasadanam plot length 28 mm

Lathe and milling machine process nerazgadannyi section of the rod, forming the outer and the inner surface of the fitting. The length of the fitting - 27 mm

Also on a turning machine on a flat circular surface of the flange choose a thickness of 0.75 mm, with the establishment of the periphery of the annular thickening, thickness 1.6 mm

Rotary extractor for the C flange form a conical surface with a wall thickness of 0.5 mm, keeping thickening on the periphery of 1.6 mm Rotary extractor carried out on a tapered mandrel with the opening angle of the cone - 84°. Cone comply with a diameter of 52 mm and a length of 14 mm, the angle of inclination of the cone to the horizontal axis is 42°.

In the molding process of the bottom on the press wall thickness of the bottom is reduced to 0.5 mm Outer diameter after extrusion is 48 mm, the inner - 45 mm On the peripheral part of the bottom, above the thickening grinds an annular groove with beveled wall and reduction of the outer diameter from 48 to 46 mm

1. Plastic tank high pressure, comprising an external power plastic shell and an inner thin-walled steel liner that contains a middle cylindrical part, two bottoms and fitting, at least one plate, characterized in that the fitting and the bottom is made in one piece from a workpiece in the form of rod to use for forming the bottom wall of operations, rolling and rotating hoods, and for the formation of the fitting - turning.

2. Plastic container according to any one of claims 1 and 2, characterized in that the bottom is connected with the middle cylindrical portion by welding, each of the heads includes a peripheral annular wall section in connection with the middle cylindrical part made by thickening of the wall with an inner toronyi annular groove from the outside, forming on the peripheral annular area of the ledge for sitting the middle of the cylindrical part.

3. A method of manufacturing a plastic container with a thin steel liner that contains a middle cylindrical part and two bottoms, at least one of which contains a socket, the method includes connecting weld seam middle cylindrical portion with a bottom, wherein the bottom and fitting done at one of the blanks in the form of a steel rod of a given size, while the rod is rolled from one end, forming a flange, having on one side a flat circular surface that engages with the opposite side with prasadanam section of the rod, the length of which is sufficient for the formation of the fitting, nerazgadannaja section of the rod mechanical the processing of forming the outer surface and the inner channel fitting, flange by rotational extrusion with subsequent forming press to form the bottom of a given shape, which is connected with a middle cylindrical portion and are welded along the perimeter of their connection.

4. The method according to claim 4, characterized in that before the rotary hood on a flat circular flange surface machining creates the periphery of the flange thickening, which saves on the inner side walls of the bottom after forming the pre is catfish, on the outer side walls of the bottom above the thickening perform an annular groove of a given diameter, forming on the peripheral wall section of the bottom ledge, on which is placed the middle cylindrical portion, and carry out the welding.



 

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