Thin-wall envelope forming method

FIELD: machine engineering, possibly manufacture of sealing envelopes of corrosion resistant steels of metal-plastic high-pressure bottles.

SUBSTANCE: method comprises steps of separately making metallic convex bottoms with cylindrical collar and backing ring. Thermal expansion factor of backing ring exceeds that of bottoms; outer diameter of backing ring provides close fit of bottoms onto it at 20°C; cooling preliminarily assembled backing ring with bottoms until cryogenic temperature; sliding bottoms on backing ring in cooled state until mutual touch of cylindrical collars of bottoms; heating assembly up to 20°C in order to provide close fit of backing ring in cylindrical collars of bottoms; welding bottoms along butt of assembly and then removing backing ring by chemical milling.

EFFECT: simplified process of making envelopes with enhanced mass characteristics.

2 cl, 4 dwg, 1 ex

 

The invention relates to space, aviation, transport, chemical and other branches of technology, and more specifically to the invention of thin-walled sealing membranes (Laverov) of stainless steels for plastic containers (cylinders) high-pressure.

One of the most important characteristics of the quality of such cylinders is to minimize the proportion of the mass of the empty container in the mass of the charged. In the currently released containers (plastic bottles) this characteristic is relatively high due to the considerable weight of the sealing shell (liner).

A known method of manufacturing a metallic shell (or a cylinder), including the manufacturer of the convex bottoms with a cylindrical section or belt, Assembly and welding of the parts of the container at their edges using at least one internal slip rings (see, for example, patent RF №2167019, CL In 21 Days 51/24, 23 To 9/14 from 03.02.2000 year). The Assembly of the parts of such a container is carried navigantium bottoms on a base ring, gradually respira edges to complete their matches and provide the necessary welding gap.

However, this method cannot be used for the manufacture of thin-walled shells for buckling bottoms when applying the axial load in the Assembly of the shell.

Famous composition is allony (capacity) high pressure and methods of their manufacture, containing a closed thin metal shell of steel with a wall thickness of 0.5...0.9 mm and an external organoplastic shell around the entire surface of the metal shell (liner) (see, for example, patent RF №2077682, CL F 17 C 1/06 from 29.04.1994 year).

When welding individual pieces of thin metal shell such cylinders (tanks) used slip rings, which in the final full welding of the liner remain inside the liner, reducing the mass properties of the container.

There is also known a method of manufacturing a thin-walled shell (tank), which is produced separately convex metal plate with a cylindrical belt and slip ring. Thus the outer diameter of the slip rings perform in size, providing a tight cap on it bottoms at room temperature, sostakovic bottoms using slip rings, cool it down to cryogenic temperatures, produce a coupling of the welded parts of the shell, the resulting Assembly is heated to room temperature, providing a tight fit slip rings in cylindrical bands bottoms and produce welding heads at the junction of the resulting assemblies (see, for example, European patent EP 0833097, CL F 17 C 1/14, F 17 C 1/02, 23 To 20/12 published 01.04.1998 onwards).

However, this method has drawbacks - in particular, increased wt the new features of that slip ring remains inside the shell.

The present invention is to provide a method of manufacturing thin-walled sealing shell (liner) plastic bottles with the achievement of the technical result in the form of simplifying the technology and improve the mass properties of the shells.

This task is solved in that in the method of manufacturing a thin-walled shell, which is made separately thin-walled metal convex bottom with a cylindrical spigot and washer, ring, while the outer diameter do of size, providing dense nozzle bottoms at room temperature, pre-sostakovic bottoms using slip rings and cooling to cryogenic temperatures, the resulting Assembly is heated to room temperature, providing a tight fit slip rings in cylindrical bands bottoms, and produce welding heads at the junction of the resulting assemblies.

In accordance with the invention, the slip ring is made from a material with a coefficient of thermal expansion greater than the coefficient of thermal expansion of the material of the bottoms, plain ring is cooled to cryogenic temperatures simultaneously with the ends pre-assembled, in a cooled state and pushes the bottom n the slip ring to the contact of cylindrical bands bottoms, produce a weld obtained Assembly after heating to room temperature and then slip the ring is removed by chemical milling (etching).

Using this method produce different capacity increased volume by entering into the design of the intermediate cylindrical shell with a diameter corresponding to the diameter of the bottoms.

Hereinafter the invention is explained in more detail using the drawings, where

1 shows a thin-walled sealing shell (liner) assembled,

figure 2 - scheme of pre-Assembly bottoms with swivel ring to cool,

figure 3 - the collected bottoms with swivel ring after it slipped on easily bottoms on a base ring refrigerated,

figure 4 is a thin-walled sealing sheath of the increased volume.

Thin-walled sealing shell (liner) contains two convex (or hemispherical) of the bottom 1 and 2. On one of the heads has a nozzle 3 for supplying fluid first after welding to fill the internal cavity of the liner reagent required for the removal of chemical milling (etching) of the support ring 4, and then the regular product (gas or liquid).

The proposed method of manufacture is as follows.

Made individually thin-walled metal is licencee of corrosion resistant materials (e.g., stainless steel convex bottom with a cylindrical bands 5 and 6, slip ring, for example, aluminum alloy. Thus the outer diameter of the slip rings perform in size, providing a tight fit on it bottoms at room temperature, pre-assemble the bottom and washer, ring, cooled to cryogenic temperature, such as liquid nitrogen, while the bottom and back up ring and refrigerated pull the bottom on a base ring to the contact of cylindrical bands.

To facilitate the bottoms slipped on easily on a base ring 4 has the starting cones 7. The necessary clearance when the Assembly is achieved by the fact that the thin plate and the support ring is made of materials with different coefficients of thermal expansion. After that, the resulting Assembly is heated to room temperature. Assembled design after reaching room temperature provides the necessary coincidence of the welded edges, sufficient for welding with small talovlozheny, - electrolicious, laser, etc. Then produce welding the resulting assemblies. To improve the mass properties of the welded shell (liner) slip ring is removed by the method of chemical milling (etching), and the bottom of corrosion-resistant material produced is not damaged.

In the manufacture of containers increased volume at a constant diameter of the bottoms (see figure 4) to thin-walled bottoms pre-weld intermediate housing shell 8 and 9 to remove the snap (Rethimnon ring), and the final weld performed with the welding conditions set forth above.

This solution ensures cylinders of various capacities while minimizing the cost of making incoming details.

Example.

Manufacturing shell (liner) plastic container (capacity) inner diameter of 360 mm welded end plates of 0.3 mm thickness, manufactured by rotational hood. The Assembly of these heads for welding performed on the pre-cooled together with the bottoms of the aluminum ring with the original diameter 360,1 mm, which on cooling to T=-196° (liquid nitrogen temperature) is reduced to the size 359,2 mm, providing a clearance of 0.4...0.45 mm on the side. Welding is performed by laser beam on a special installation.

The result is a thin-walled sealing shell (liner) plastic container, the mass of which is minimized in comparison with a mass similar lanero obtained in other ways.

1. A method of manufacturing a thin-walled shell, including the manufacture of separately convex metal heads with cylindrical paasc the m and washer, ring, thus the outer diameter of the slip rings perform in size, providing a tight fit on it bottoms at room temperature, pre-matching bottoms with the use of slip rings and cooling to cryogenic temperatures, heating the resulting Assembly to room temperature, ensuring a snug fit, slip rings in cylindrical bands bottoms and welding the bottoms of the junction of the resulting assemblies, characterized in that the slip ring is made from a material with a coefficient of thermal expansion greater than the coefficient of thermal expansion of the bottoms, plain ring is cooled to cryogenic temperatures simultaneously with the ends pre-assembled, in a cooled state and pushes the bottom on a base the ring until it touches the cylindrical Spigots of bottoms, after heating the resulting Assembly to room temperature to produce the welding of the junction, and then slip the ring is removed by chemical milling.

2. The method according to claim 1, characterized in that the welding convex bottoms produced through the intermediate casing cylindrical shell.



 

Same patents:
The invention relates to mechanical engineering and can be used in the Assembly with interference fit parts like nut - case, in particular thin-walled parts

The invention relates to a mechanical Assembly production, and is intended for direct control of the strength of the coupling parts with tightness in established connections

The invention relates to flywheels, consisting of two masses with the possibility of rotation relative to each other by means of a support, and to the tight fit of the bearing in/on one of these masses to provide support

The invention relates to the field of General engineering, in particular to the development of manufacturing technology of dismountable joints of machine parts using shape memory effect

Composite matrix // 2198761
The invention relates to equipment for processing of metals by pressure, particularly to constructions composite cylindrical matrices with shroud ring

The invention relates to the field of repair of armored vehicles and armament in the field of military repair services

The invention relates to the Assembly of the pistons of internal combustion engines and can be used in the repair and restoration of the pistons

The invention relates to a method of fixing the metal parts from turning around the axis of the mounting and can be used in various fields of technology and engineering, for example for fixing the spring clip and an acoustic alarm device wear on the pad disk brake car

The invention relates to railway transport, in particular to the connection of the wheels to the axle of the wheelset, and can be used to join parts with tightness in mechanical engineering

The invention relates to the repair of armored vehicles

FIELD: plastic working of metals.

SUBSTANCE: method comprises steps of making shell, upper bottom, mouth, lower bottom and joining all parts by welding; forming lower bottom as one piece with backing flanged ring; inserting lower bottom into shell along backing ring until flange rests upon shell; butt welding shell and lower bottom on backing ring.

EFFECT: enhanced centering due to accurately inserting lower bottom to shell, improved quality of welded seam of lower bottom and shell, lowered labor consumption for making bottle.

1 dwg, 1 ex

FIELD: plastic working of metals, namely manufacture of high-pressure bottles.

SUBSTANCE: method comprises steps of forming shell; swaging at least one open end of shell; forming bottom and mouth while making at least two mutually joined cone surfaces and increasing central angle from shell to mouth; at least after one swaging operation performing heat treatment of swaged end of shell. High-pressure bottle includes shell and two bottoms. One bottom has mouth for placing locking means. Bottom and mouth are made as one piece. Bottom from shell until mouth is in the form at least of two joined lateral surfaces of circular regular truncated cones. Each such joint is performed due to joining lateral surfaces of truncated cones along lines of bases of their small and large diameters respectively. Said joints may be smooth, with radius transitions.

EFFECT: simplified design of bottle, enhanced technological effectiveness of making it.

6 cl, 4 dwg

The invention relates to the production of acetylene cylinders filled with a porous mass
The invention relates to mechanical engineering and can be used in the manufacture of pressure vessels, in particular for steel cylinders for fire extinguishers

The invention relates to the processing of metals by pressure and is used in the manufacture of laminated products stub type

The invention relates to the field of metal forming and can be used in the manufacture of high-pressure cylinders for storage and transportation of compressed and liquefied gases mainly fire extinguishers

The invention relates to the processing of metals by pressure, in particular to a pressure processing rollers without deliberate thinning of the wall flat or cupped blanks

The invention relates to the construction of high pressure vessels

The invention relates to the field of metal forming and can be used in the manufacture of high-pressure cylinders for storage and transportation of compressed and liquefied gases mainly fire extinguishers

FIELD: plastic working of metals, namely manufacture of high-pressure bottles.

SUBSTANCE: method comprises steps of forming shell; swaging at least one open end of shell; forming bottom and mouth while making at least two mutually joined cone surfaces and increasing central angle from shell to mouth; at least after one swaging operation performing heat treatment of swaged end of shell. High-pressure bottle includes shell and two bottoms. One bottom has mouth for placing locking means. Bottom and mouth are made as one piece. Bottom from shell until mouth is in the form at least of two joined lateral surfaces of circular regular truncated cones. Each such joint is performed due to joining lateral surfaces of truncated cones along lines of bases of their small and large diameters respectively. Said joints may be smooth, with radius transitions.

EFFECT: simplified design of bottle, enhanced technological effectiveness of making it.

6 cl, 4 dwg

Up!