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 mm

The 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 mm

In 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.

 

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