Method of making metallic casing gas cylinder

 

(57) Abstract:

The invention relates to a process of manufacturing a metallic gas cylinders from low-carbon steel, and in particular to methods of manufacturing a sealed thin-walled housings pneumoconiotic cylinders (household, sports, automotive, aviation, rail, ship, etc. for liquefied petroleum gas), and can find application in various fields of engineering in the manufacture of pressure vessels. The invention consists in that the known method of manufacturing the metallic casing of the gas cylinder, including making caps of the housing of the measuring workpieces of a certain thickness and diameter by hoods without thinning and intermediate chemical-heat treatment, both the cap is made from a single dimensional workpiece, and on one of the caps in the environment make rotary crimping lock the filler neck welded to its bottom supporting element, such as a Shoe, and the other cap is decorated in the bottom of the hole, for example, punching on the stamp, mounted therein by welding the valve sleeve and is fixed on the outside of his welding other items (collar or handle), then the bottom link pramode - normalizing at a temperature of 850-900oC and the shutter speed from 3 to 20 minutes 2 Il.

The present invention relates to manufacturing processes for metal gas cylinders from low-carbon steel, and in particular to methods of manufacturing a sealed thin-walled housings pneumatic gas-liquid bottles (domestic, sports, automotive, aviation, rail, ship, etc. for liquefied petroleum gas), and can find application in various fields of engineering in the manufacture of pressure vessels.

According to the norms of mining, manufacturing technology cylinder pressure to ensure high reliability of structures with minimal scatter their functional characteristics.

In this case, the cylinders must be able to withstand a large number of loading cycles, to have life in different climatic conditions for at least 10 years, the destruction of shatterproof bottles, etc.

However, existing domestic technology for the mass production of tanks does not allow to achieve full mechanical reliability under cyclic loads.

A known method of manufacturing buildings metal gas cylinders in the second punching through hoods without thinning, manufacturer of shell from a sheet folding in the mill and the subsequent welding of the longitudinal seam (see "Container for liquefied gases. Type 3. Technical description and operating instructions 3539-00", the Ministry of gas industry. Management of fuel and energy agriculture, 1984). For this technology is produced at the present time most of the cylinders at a pressure of 16 kgf/cm2with a wall thickness of 3.0 mm, Manufacturers: Druzhkovka and Novogrudok plants gas equipment Podolsk machine-building plant, Tula railway engineering plant and other

The task of the known technical solutions was to provide higher reliability and load bearing capacity of the cylinders under cyclic loads.

Common features with the proposed method is the availability of the operations of manufacturing caps (bottoms) from the measuring workpieces of a certain thickness and diameter by hoods without thinning, and welding the bottoms of the annular beads.

This embodiment of the technology known method leads to a sharp decrease in cyclic reliability of cylinders in the course of operation, which is explained by the fact that the bottom parts are annealed prior to welding and during usage of the ome, this technology leads to a high variation of stresses in the body due to the presence of welds with low allowable elongation. All this together limits the operational capabilities, reduces the reliability of the resource and leads to a significant lag on key indicators such gas cylinders pressure from the global level.

There is also known a method of manufacturing buildings metal gas cylinders at a pressure of 16 kgf/cm2with a wall thickness of 2.5 mm cylinders firm "Faber", Italy adopted by the authors for the prototype (see the book "Gas powered cars", authors: E. Grigoriev, Kolupaeva B. D. and others, Moscow, Mashinostroenie, 1989, S. 216).

In this way the bottom is made from dimensional workpieces of a certain thickness and diameter, deep drawing, and cylindrical sections of the shells are produced by the rolling of heads.

As can be seen from this technical solution, the operation of rolling the cylindrical sections of the shells of the bottoms do not provide stress relief, and their distribution across the wall thickness to happen nonlinear and irregular.

In this regard, in the weld tensile strength of the metal due to the uneven distribution of MT reliability of rolled hull of the tank.

Therefore, this method is as similar leads to reduced maintenance (cyclic) reliability.

This method is also inefficient.

As shown by the technological expertise of the company on the application of methods of metal forming, rolling acceptable mainly for small-scale production (speed rolling is low and amounts to not more than 10 m/h), and its use is only effective in the manufacture of the bigger parts from high-strength alloy steel that is beyond the scope of the cylinder fabrication, mass production and application.

Thus, the objective of this technical solution (prototype) was to increase the operational reliability of the cylinder due to internal stress and improve the quality of the cylinders by increasing control, which is the characteristic parameter of the quality of design of the gas cylinders.

Common features offered by the authors of the method of manufacturing the metallic casing of the gas cylinders is the availability of the operations forming the bottoms of the measuring workpieces of a certain thickness and diameter by hoods without thinning and intermediate chemical-thermal treatment.

In addition, the stringent requirements of the state Standards for tanks-pressure lead to the restriction of the possible list of promising and suitable for use in the manufacture of metallic gas cylinders pressure, technologies and materials.

Unlike the prototype, the proposed method of manufacturing the metallic casing of the gas cylinder both cap is made from a single length process of a certain thickness and diameter, and on one of the caps in the cut issue a rotary crimping lock the filler neck welded to its bottom supporting element (Shoe), and the other cap make a hole in the bottom, for example the breakdown on the stamp, mounted therein by welding the valve sleeve and attach the outside welding other items (collar or handle), then the bottom link on the castle in the shell butt welding ring seam, and all the resulting body is subjected to heat treatment is normalizing at a temperature of 850-900oC and aged from 3 to 20 minutes

It allows to make a conclusion about the causal connection between the set of essential features of the claimed technical solution to achieve the technical result. Ukazannikh cases sufficient.

Object of the present invention is to provide a technology of metallic casing of the gas cylinder, allowing you to get the cylinders with a simple and effective control technology fastening elements to it, and normalized by the body, which is the characteristic parameter of the quality of gas cylinders that can withstand a large number of loading cycles, with high reliability and service life in different climatic conditions and provides a shatterproof destruction.

Together, the aim was to create technology buildings metal gas cylinders with enhanced performance characteristics.

The proposed method of manufacturing a metallic gas cylinders pressure has advantages over the prototype. So the use of heat treatment-normalization will form a more uniform metal structure and to eliminate residual internal stress in the body compared to the annealing bottoms before welding and fastening elements of the cylinder (valve coupling, handle, collar, Shoe) to the welding of girth weld provides a simple and effective technology quality control cylinders.

This will improve operation the it service life.

All this together will lead to increased resistance cylinders to cyclic loads compared to cylinders and analog prototype and will make them shatterproof destruction.

The invention consists in that in the method of manufacturing the metallic casing of the gas tank for liquefied hydrocarbon gases, including making caps of the cylinder housing of the measuring workpieces of a certain thickness and diameter by hoods without thinning and intermediate thermo-chemical processing of both cap is made from a single dimensional workpiece, and on one of the caps in the cut issue a rotary crimping lock the filler neck welded to its bottom supporting element, such as a Shoe, and the other cap is decorated in the bottom of the hole, for example by punching on the stamp, mounted therein by welding the valve sleeve and attach the outside welding other items (collar or handle), then the bottom connect the butt into the body of the tank welding annular seam, and the whole body of the container is subjected to heat treatment is normalizing at a temperature of 850-900oC and the shutter speed from 3 to 20 minutes

In Fig. 1 shows the proposed manufacturing technology, korpusa the first single cap (I hood without thinning); 3 revnostny single cap (II hood without thinning); 4 bottom bottom neck under lock and key; 5 top bottom hole vertical coupling; 6 top plate with hole for valve coupling; 7 top bottom with valve coupler and the handle (collar); 8 housing cylinder ring after welding and heat treatment normalize.

In Fig. 2 shows the construction of the body of the gas cylinder, obtained by the proposed technology, where: 9 top plate; 10 bottom plate; 11 - valve coupling; 12 handle (collar); 13 Shoe.

Currently, the construction of the body of gas cylinders, which will be produced by the proposed technology has been tested, the technology is considered promising and decided to produce buildings of the cylinders of the proposed technology.

The proposed method of manufacturing the metallic casing of the gas cylinder is as follows.

Example. Hulls cylinders of the upper and lower caps was carried out at the pressure of 16 kgf/cm2sheet cold-rolled high-ductility low carbon steel 18 SA TU 14-1-4931-90 with mechanical characteristics:in= 34-46 kgf/mm2that is, the relative untinen ezany on strip width 465-4mm, then from the strip was cut circles with a diameter of 450-1,55mm.. Mugs were subjected to recrystallization softening annealing and phosphating. Then from the circle hood 1 (without thinning) received equal thickness was a cap with a diameter of 300 mm and a height of 133.145 mm After recrystallization softening annealing and phosphating complied with the hood II (without thinning) and received equal thickness was a cap with a diameter of 229 mm and height 198 mm min then to relieve internal stresses obtained hood was subjected to annealing de-stress. Then to get the top of the bottom of the cap has been facing in size according to the drawing and punching holes in the bottom of the stamp, and to get the bottom of the bottom of the facing in size according to the drawing and crimping the cap lock rotary swaging. Then to the bottom plate was welded to the Shoe, which is made of sheet steel of 0.8 Yu thickness of 2 mm by cutting the latter into strips and cards that were punched slots and openings and flexible in the mill with subsequent welding and moulding made in the Shoe. The upper plate was welded valve sleeve decorated with carvings and a pen.

Valve sleeve made of a circle of diameter 50 mm (Staley, cutting sweep, marking and flexible. After installation (welding) on the bottoms of the structural elements was carried out by a simple and efficient quality control of the received bottoms.

Then the upper and lower plate joined to each other by a castle in the shell butt annular welding seam, and the quality of the ring weld was evaluated by x-ray.

The resulting body of cylinders then subjected to heat treatment is normalizing at a temperature of 900o15oC, the shutter speed of at least 15 minutes, and then they were subjected to hydraulic and pneumatic tests.

The proposed method was developed technical documentation inv. T-2114, And-2092, made an experimental batch of gas cylinders 27,2 l and 12.3 l in 500 pieces of each type and conduct acceptance tests.

As shown by the results of the test cylinders obtained by the proposed technology, can withstand a significant number of loading cycles (more than 12 thousand cycles of loading test pressure), and the destruction of the cylinders is shatterproof.

The obtained results and their comparative analysis with known suggests that the task of improving operational characteristics of the performance of a metal gas tank, made from mild steel 18 SA by the proposed method achieved significantly better levels best designs cylinders of the same class.

Currently developed in accordance with the proposed method, a new technology TA 9312 made party balloons (Passport No. 1 from 13.10.94), which was certified for compliance with the requirements of Supervisory bodies in Germany and given permission for their production and delivery to Germany. (Tolerance design 02RUS1; 02RUS2).

Method of making metallic casing gas cylinders for liquefied petroleum gases, including making caps of the cylinder housing of the measuring workpieces of a certain thickness and diameter by hoods without thinning and intermediate chemical-heat treatment, characterized in that both the cap is made from a single dimensional workpiece, and on one of the caps in the cut issue a rotary crimping lock the filler neck welded to its bottom supporting element, such as a Shoe, and the other cap is decorated in the bottom of the hole, for example, by punching on the stamp, mount it by welding a valve sleeve and attach the outside welding collar or handle, and then extracting the heat treatment is normalizing at a temperature of 850 950oAnd the excerpt 3 20 min

 

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