A method of manufacturing a metallic gas cylinders
(57) Abstract:Usage: in the field of mechanical engineering. The inventive disk workpiece of given diameter and thickness by hoods without thinning of the walls of the stamp body. First the hood without thinning lead with a drawing ratio of 0.60...to 0.65, and the rest with the drawing ratio 0,65 0,75.... Then by one or two operations deep drawing thermoabrasion wall with deformation rate of 20 - 30%. Last action deep drawing is performed by changing the wall thickness in the area from the bottom to the thickening of the edge of the workpiece under the sealing cap. When the sealing cap is first formed into supporting its surface and a preliminary profile of the transition area, and then the final dimensions of the neckline. 2 Il. The invention relates to a process of manufacturing a metallic gas cylinders of high-alloy steel, mainly high pressure (100 kgf/cm2and above) and can find application in various fields of engineering in the manufacture of pressure vessels used in breathing apparatus rescue, scuba gear, and also for storage of compressed gases (air, oxygen, nitrogen and others).A known method of manufacture m is>/P>On this way of measuring billet chrome-molybdenum steel 34 CrMo4 Din17, 200 through a series of extracts (folds) in combination with intermediate thermochemical processing produce stamping body. Then make the rolling of the cylindrical part and sealing on a hot neck received in the housing, as well as machining and heat treatment.The objective of the invention is to create a technology metal fabrication gas cylinders high pressure, allowing you to get the cylinders with low metal content, can withstand a large number of loading cycles, to have high reliability and service life.This is achieved by the fact that in the proposed method of manufacturing a metallic gas cylinders heat treatment are after machining and forming of the walls is carried out by one or two operations deep drawing with thinning on presses with deformation rate of 20-30%, the latter restriction, when heated sealing the neck of the first mold supporting surface and a preliminary profile of the transition area, and then the final dimensions of the neck, with the first extraction is carried out with coefficient convolution 0,60-0,65, and the rest convolution coefficient of 0.65 is high pressure:
a . .. Dr. revnostnie workpiece, respectively, after 1 ... 5 hoods without thinning t=6.0 mm (sheet thickness);
e - procurement after extraction with thinning with variable wall thickness in longitudinal section, tcyl.parts=5.0 mm, tsphere=6.0 mm;
W - billet after extrusion with the thinning with the restriction of having a variable wall thickness in longitudinal section, tsphere=6.0 mm, tcyl.parts=4.0 mm, tedge=5.0 mm;
C - metal gas cylinder after closing of the neck and machining.In Fig. 2 presents the design of the gas tank, obtained by the proposed technology, where 1 is the cylindrical shell, 2 - spherical bottom, 3 - spherical bottom neck, 4 - tapered part of the joint shell with a spherical bottom.P R I m m e R. the Manufacture of gas cylinders was carried out at an internal pressure of 300 kgf/cm2sheet hot-rolled high-strength structural alloy steel brand VP-30 (TU-1-4461-88) with mechanical characteristicsin67 kgf/mm2, elongation not less than 21%. Sheet size 6000 x 1600 x 6mm cut into strips 539 x 1600 mm, which was cut down disk workpiece diameter 520-1,1 mm Before the hood is for at least one hour, phosphating and bezodiazepine at a temperature of 310 340 ... aboutC for not less than one hour. Specified thermochemical processing were subjected to blanks before each pressing operation. Hoods on presses without thinning received ravnocennuu the workpiece wall thickness 6 0 mm (sheet thickness), and a diameter of 150 mm, 1 mm, height 450 ... 470 mmThe hood without thinning are: first, with the drawing ratio of 0.60, and the other is with the drawing ratio of 0.65 ...Then the resulting intermediate product was subjected to extraction with thinning with deformation rate of 23% . The resulting preform has a variable wall thickness in longitudinal section (tsphere6.0 mm, tcyl.parts5.0 mm in diameter 146,3 mm, height 515 ... 530 mm).The final (second) hood with thinning received billet led with a limit to the degree of deformation of 25%, which provided the final geometrical parameters of the spherical bottom, a cylindrical part, a zone of transition from spherical bottom to the cylindrical part of the cylinder and necessary for closing the filler neck, the geometric dimensions of the sides of the piece.The resulting preform has a variable wall thickness in longitudinal section: fields of 6.0 mm, tcycle.partsaboutWith a shutter speed of at least 1 h, after which produced the facing, cleaning the inner and outer surfaces from scale and heated seaming cap. In the first stage of the process of seaming formed (reference calibrating roller) bearing surface with decreasing diameter of the hole at the end to the diameter of 35-40 mmIn the second stage deformed (forming the radial roller) a preliminary profile of the neck with the amount of compression up to 0.3 of the radius of the forming radius of the roller in one pass. Then at the third stage of movement of the reference calibrating roller designed the final dimensions of the cylindrical part of the neck and the profile of the transition zone to the required linear dimensions.Then in the resulting semi-finished cylinder subjected to mechanical processing of the neck, including cut thread and made a hardening heat treatment (tempering by heating to a temperature of 900 920 ... aboutWith aged not less than 18 minutes and leave low at a temperature of 340 360 ... aboutWith aged not less than 90 minutes), which produces a cylinder with the required mechanical propertiesin145 kgf/mm2, elongation not less than 7%.
2at 2.8, the tensile strength of the balloon reaches 145 ... 165 kgf/mm2(1.5 times higher than that of the prototype), and the minimum elongation is >7%.Obtained by the proposed method the cylinders 7,3 allow you to fill them in 2, 19 m3gas instead of 1.75 m3the prototype (balloon company "Faber") and have the ratio of the mass of the cylinder to the volume of filled gas 4,173 mg/m3instead 4,285 kg/m3. A method of MANUFACTURING a METALLIC GAS CYLINDERS high pressure of high-alloy steel, including stamping the housing of the disk specified diameter and thickness by hoods without thinning with the subsequent forming of the walls combined with thermochemical processing before each operation hoods, pre-heating of the end portion of the workpiece under the sealing, the sealing cap and the subsequent machining and heat treatment, characterized in that the first hood without thinning lead with a drawing ratio 0,60 - 0,65, and the rest with a drawing ratio of 0.65 - 0.75, and the forming of the walls is carried out by one or two operations deep drawing with thinning of the walls with deformation rate of 20-30%, the latter is performed by changing the wall thickness in the area from the bottom of the face and a preliminary profile of the transition section, and then the final dimensions of the neck, and the heat treatment are after machining.
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
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: 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
FIELD: storing or distributing liquids or gases.
SUBSTANCE: method comprises molding at least of two sections of the vessel whose one bottom has an opening, and joining the sections together by outer and inner seam weld. The inner welding is performed before the outer welding. The inner and outer seams are overlapped. The inner seam weld is performed through the opening in the bottom of one of the sections to be welded.
EFFECT: reduced labor and metal consumptions.
1 cl, 3 dwg
FIELD: plastic metal working, namely shaping hollow variable cross section bodies.
SUBSTANCE: method comprises steps of shaping in die having opening for introducing hollow body and profiled inner surface corresponding to desired profile of hollow body; creating on inner surface of die temperature gradient increased in direction of hollow body motion from minimum temperature near inlet opening of die to maximum temperature in zone of least cross section of body; setting maximum temperature according to condition of largest yielding of body material; setting minimum temperature according to condition of keeping stability of body and heating body till said maximum temperature during its motion in die. In order to make metallic liner of metal-plastic high-pressure vessel from tube blank, ends of tube blank are squeezed in die with profiled inner surface. Tube blank is guided into die along its lengthwise axis. On inner surface of die temperature gradient is created in such a way that it increases in direction of blank motion along lengthwise axis of die from minimum temperature at inlet of die till maximum temperature in zone of least cross section of liner. Maximum temperature is set according to condition of largest yielding of tube blank material; minimum temperature is set according to condition of keeping stability of blank and heating blank till said maximum temperature during its motion in die. Apparatus for shaping hollow variable cross section body includes die mounted on stationary support and having inner surface of preset profile and also having inlet opening for feeding hollow body. Apparatus also includes slide made with possibility of mounting on it hollow body moving along lengthwise axis of die. Die is provided with heating unit for creating on inner surface of die temperature gradient increased along lengthwise axis of die from its inlet opening.
EFFECT: improved quality of articles due to prevention of stability loss.
16 cl, 2 ex, 6 dwg
FIELD: plastic metal working.
SUBSTANCE: method comprises setting the blank in the mandrel provided with the cylindrical and shaped sections, locking the blank in the cylindrical section of the mandrel, and affecting the blank by deforming rollers. The shaped section is initially formed by moving the rollers in different trajectories during one or several runs. Upon unlocking the cylindrical section, the blank is locked in the shaped section and the cylindrical section is drawn by moving the rollers in the opposite direction.
EFFECT: expanded function capabilities.
1 cl, 3 dwg, 2 tbl
FIELD: mechanical engineering; pressure vessels.
SUBSTANCE: according to proposed method, spheroidal bottom is made of sheet, thickness of 0.5-0.6 of designed thickness for initial elliptical bottom and is subjected to deformation at higher process upsetting pressure of 1.3-1.5 of designed value.
EFFECT: facilitated and reduced cost of manufacture.
2 cl, 1 dwg
FIELD: plastic metal working.
SUBSTANCE: invention can be used for making of bottles from sheet blanks. Proposed method includes making of shell, top plate, neck, bottom plate made integral with support ring, flanging and shoe, assembling and connecting the parts by welding. Shell is butt-welded to bottom plate on support ring. Both plates are made of blanks of equal size and in form of bottom plate. When making top plate, support part of shoe is calibrated to bring its diameter to diameter of shell.
EFFECT: reduced labor input.
1 ex, 1 dwg
FIELD: plastic working of metals, namely manufacture of high pressure vessels from recovered ammunition.
SUBSTANCE: method comprises steps of producing blanks, subjecting them to hot deformation, hot molding of vessel mouths, mechanically working vessel mouths; subjecting articles to heat treatment for providing desired strength of vessels; using as blanks bodies of recovered artillery fragmentation type or high-explosive shells with removed collar; cutting each shell in joining zone of its ogival and cylindrical parts for preparing two blanks, namely cone blank with through opening and sleeve like blank with bottom. Heat treatment is realized according to preset mode.
EFFECT: lowered cost, improved factor of metal usage due to using recovered bodies of artillery fragmentation type high-explosive shells, enhanced quality of using shell steels.
4 cl, 2 dwg, 2 ex, 5 tbl
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