High pressure vessel forming method

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

 

The invention relates to the manufacture of pressure vessels from recyclable munitions to be destroyed, in particular from recycled corps artillery shrapnel and high-explosive shells by direct redistribution in pressure vessels, in particular seamless gas cylinders high pressure, and can be implemented by using rasaratnam body of the projectile without leading belt (steel grades C60, s, H, - TU HAU 01644, GOST 10230)) as blanks under the hot plastic deformation to create the shapes and sizes of vessels with subsequent heat treatment to provide the required structural strength and machining for the thread, and other items intended for attachment to the pressure vessel, valves and other parts. Depending on the caliber of the projectile on the proposed method can be obtained cylinders of different capacities according to GOST 949.

It is known that the corps artillery shells with remote ogival part disposed by their redistribution in billets by hot plastic deformation and subsequent manufacture of the various parts for machines and mechanisms, while section shells is transformed into the secondary billet and not in the product, and ogival h is here the case is sent for scrap.

A known method of disposal of corps artillery shrapnel and high-explosive shells that have to be eliminated due to the expiration of the retention period, the corps artillery shells new, promising structures (EN 2088393 C1, 27/08/1997). The known method of manufacture of shells shells new designs as a workpiece using a recycled body of the projectile, which is cut off from the arched part of the variable diameter 20-40% of the length of the hull, Stakhanovite ethnotaxonomy part of the body of the projectile is heated in the coil in a vertical position with the bottom up to a uniform temperature, set the bottom end rolls on core sending and implement helical deformation of the three rollers mill helical rolling.

This method of disposal of buildings missiles to be destroyed, is of limited use, because firstly, by virtue of design features limited possibilities of transformation of old shells shells shells shells new designs, secondly, at the present time in Russia there is no production of shells at the same scale, which limits the possibility of using a known method.

In addition, in this way ogival part of the body of the projectile is also not used as blanks for the manufacture of products, and is sent to scrap.

As a rule, the corps artillery shrapnel and high-explosive shells that must be destroyed, recycled as scrap metal and go for remelting. When this method of disposal of buildings shells completely lost earlier hard work to obtain metal and shaped articles such as "glass".

A known method of manufacturing a high-pressure cylinders, including the production of billets, hot plastic deformation, hot forming necks of vessels, mechanical processing of the necks of the vessels, and heat treatment of the obtained products to provide the required structural strength pressure vessels (SU 1750817 A1, 30.07.1992).

The disadvantage of this method is the need for prior preparation for the cylinder, resulting in increased complexity of the method due to the presence of additional operations - cutting tubes into shapes, seaming heads and necks, etc. and therefore dramatically increases the cost of such a method.

Technical result achieved in the claimed invention, is to provide the most rational method of manufacturing pressure vessels. from recycled corps artillery shrapnel and high-explosive projectiles caliber from 37 to 203 mm, intended for destruction by their Pramogu the redistribution in the pressure vessel, in particular, gas cylinders, high pressure, at the shortest, resource-saving technological scheme that will allow you to:

- to produce civil purposes, in particular the cylinders that are in demand in mass quantities, with lower costs compared to conventional technologies, when the preparations for the manufacture of cylinders used: leaf, rolled or pipe;

- to use in products for civil use of high-quality metal shell steel grades C60, s, H and other manufactured more than 20 years ago under the strict control of the military acceptance by THE GAU 01644 and GOST 10230;

- to use the bomb shells to be destroyed, as the original blanks for the manufacture of pressure vessels, in particular seamless high-pressure cylinders, and resource-saving technologies;

- to use almost completely the body of the projectile as blanks for direct processing into products for civil applications - high pressure vessels, utilization of metal (KIM) ≥85%.

This technical result is achieved in the method of manufacturing pressure vessels, including the production of billets, hot plastic deformation, hot forming necks of vessels, mechanical processing of the necks of the vessels, as well as thermal treatments the ku received products to provide the required structural strength of pressure vessels, where as blanks use housing disposed artillery shrapnel and high-explosive shells with a detached belt, each of which is cut in the coupling zone ogival and the cylindrical part with the receipt of two half - cone with a through hole and Stakhanovites with a bottom, a heat treatment is carried out in the following mode:

- hardening temperature 820-850°With cooling water,

- vacation at a temperature 580-680°aged 2 to 6 hours with cooling in water.

Hot plastic deformation Stakhanovites workpiece is in the formation of the hull of the first vessel with a bottom and neck.

Hot plastic deformation of the conical workpiece is in the formation of the hull of the second vessel with two necks.

In the manufacture of the pressure vessel from Stakhanovites billet additionally carry out machining of the outer contour of the bottom of the vessel.

When cutting the body rasaratnam projectile receive the items: 1) the cylindrical part of the housing with a bottom and 2) ogival part of the body that are used as blanks for the manufacture of two pressure vessels. In the proposed method, the workpiece in the form of a cylindrical part of the housing with a bottom (Stakhanovite procurement) is subjected to hot plastic Defoe the information for forming the walls and bottom of the vessel, malleability of the neck of the vessel, mechanical treatment of the neck and the outer contour of the bottom, and heat treatment products to provide the required structural strength of the pressure vessel; a tapered workpiece from the arched part of the body is subjected to hot plastic deformation to form the hull of the vessel, malleability necks vessel, machined necks of the vessel, and heat treatment products to provide the required structural strength of the pressure vessel.

The proposed method from one body of the projectile receive two bottles: from the cylindrical part of the body of the projectile with a bottom made cylinder with one mouth and a blind bottom and arched part of the body of the projectile is made of the second cylinder with two openings. While the utilization rate of the metal casing of the projectile processed in two product reaches 85%.

Hot plastic deformation in this method is carried out in the temperature range from 950°1100°With any known method, for example using the method of cross-helical rolling on a twin roll mill, or by means of hot die forging press.

Hot forming the neck of the pressure vessel carry on rolling machines method of seaming special rollers.

In the proposed method, due to the high accuracy of dimensions of the body of the projectile divided into two blanks and technology of hot plastic deformation, for example, produced by cross-helical rolling distribution, provided the required shape and high dimensional accuracy of the products, thereby minimizing the cost of machining.

Mechanical processing is performed on lathes and lies in the design of the contour of the necks of the bottles with thread and the outer contour of the bottom of one product. Along with this rolling, thanks to the continuity of the process, provides high performance manufacturing products. To implement the method selected two-high mill helical rolling, which allows you to generate higher accuracy and with high degrees of distribution in a single pass than three-roller mill.

After formation of the vessels operation is performed heat treatment: quenching with high parental leave regimes, corresponding to the grade of steel. It provides the mechanical properties required by the "Rules of arrangement and safe operation of vessels working under pressure" (PB 03-576-03)approved by Gosgortechnadzor of the Russian Federation.

Heat treatment is carried out in the following mode:

- hardening temperature 820-850°With cooling in water is;

- vacation at a temperature 580-680°aged from 2 to 6 hours, cooled in water.

Both from the same body shell of the workpiece can be processed in the cylinders on the same hardware.

The drawings show a high-pressure cylinders, in which figure 1 is an external view of the container neck, derived from Stakhanovites workpiece, the 2 - cylinder with two openings of the conical billet.

The essence of the method consists in the following.

Disposed in the casing of the projectile without leading band that represents the item type "glass" with a blind bottom, cylindrical and ogival part, cut two blanks for the manufacture of two seamless pressure vessels.

By ogival part of the body of the projectile cut 10-50% of its length and the resulting billet - billet with a bottom and procurement conical shape with a through hole is used for hot plastic deformation.

Billet with a bottom heated to a temperature rolling 950-1100°and define an open end on a core double-roll mandrel mill helical rolling. In the process of hot plastic deformation is provided by the distribution of housing, hood with thinning of the walls and forming the bottom profile. Then by hot plastic deformation on the press operation is performed calibration to ensure the receiving of the required accuracy and surface quality without the use of mechanical processing (grinding, bore).

The open end of the obtained preform in the shape of the glass is subjected to a hot sealing to form the neck of the container.

Machining of the neck and, if necessary, the bottom of the cylinder is carried out on the lathe. Machining the neckline and bottom of the cylinder lies in the design of the contour of the neck with thread and the outer contour of the bottom of product.

Preparation of conical shape with a through hole is heated to a temperature rolling 950-1100°and ask side of the larger diameter on the core mandrel twin roll mill helical rolling. In the process of hot plastic deformation is provided by the shaping of the workpiece in the form of tubes with extraction and thinning of the walls. Then by hot plastic deformation on the press operation is performed calibration to ensure the required accuracy and surface quality without the use of mechanical processing (grinding, sharpening).

Both ends of the obtained billet is subjected to hot sealing to form openings of the container.

Mechanical processing for processing the contour of the throat with a carving done on lathes.

The resulting body of cylinders subjected to heat treatment hardening with high vacation to ensure complex of mechanical properties of steel required by the rules of PB 03-576-03, IS011439. 949.

For cylinders of shell steel C60 heat treatment is performed in the following modes:

- hardening temperature 820-850°cooling water;

- vacation at a temperature 580-680°aged from 2 to 6 hours, cooled in water.

Below is an example of the production of two high-pressure cylinders from a single recycled rasaratnam corps artillery high-explosive projectile 53 OF 412 caliber 100 mm, without copper lead belt, a length of 430 mm, weight 13,1 kg

Example. 1.

The first tank bottom with a capacity of 4 liters per working pressure 20 MPa manufactured by the following method.

Manufacturing process flow of the tank bottom (PL. 1):

By arched portions of the said body on a band saw cut ogival part of the housing length 130 mm as blanks for the manufacture of cylinder used part of the housing with a bottom length of 300 mm and a weight of 10, 6 kg

The results of the acceptance test odnogolosy vessels operating pressure of 20 MPa, made of shells shells 53 OF 412 caliber 100 mm of the proposed method.

Table 2
No.View the tests The value of the characteristics and results of tests
1The test material of the vessel onTensile strength >730 MPa
stretching, GOST 10006. GOST 9012The yield strength of >581 MPa
Elongation >19%
Relative narrowing >58%
2The test material of the vessel at the bend, ISO 11439Cracks are not detected
3The test material of the vessel on impact strength, GOST 9454KCU-50°C, 150/2/5>56 j/cm2
4Metallographic determination of thickness de-carbonized layer, GOST 1763The thickness of the de-carbonized layer is not more than 5% of the thickness of the wall structure of steel-granular sorbent
5Ultrasonic flaw detection, GOST 17410Metallurgical defects (pores, cracks, etc.) not detected
6Hydraulic test vessel test pressure of 30 MPaStrains not detected
7Pneumatic test vessels leak pressure of 20 MPaThe leak was not detected
8 Hydraulic test to destruction to confirm the required factor of safety less than 2.6. GOST 2405The actual pressure destruction 62.7 MPa, the fracture behavior of shatterproof
9Hydraulic cyclic test pressure from 0.2 MPa to 25 MPa, frequency of loading 10 cycles per minute, ISO 11439,After 40 000 cycles leakage and destruction of the vessel was not detected
The test results are positive, the vessels comply with the requirements of the IB 03-576-03, GOST 949

The second pressure vessel with two necks with a capacity of 0.7 liter per working pressure 20 MPa manufactured according to the process scheme shown below in table 4.

Manufacturing process flow cylinder with two openings:

By ogival part of the body of the projectile on a band saw cut ogival part of the housing of a length of 130 mm and a weight of 2.6 kg, which is used as blanks for the manufacture of the vessel.

Table 3.
No.The basic technological operations and technological parametersThe processing mode
1Hot plastic deformation of the workpiece from the body of the projectile on dohwa who signed the camp produced by cross-helical rolling in a single pass with assurance: The temperature of 950-1100°
- molding preform conical shape in the workpiece has a cylindrical shape,
- drawing blanks on the mandrel with a diameter of 65 mm 130 mm to 350 mm
- thinning of the wall thickness from 17.5 mm to 3 mm with provision of the varying wall thickness of the cylindrical and the bottom part within 0.3 mm
2The trimming and hot calibration billet on the press
3Hot-sealing the openings of the vessel on mechanized machine seaming rollerInduction heating of the open end of the workpiece to 950-1100°
4Machining of the openings of the cylinder on a lathe to form a contour of the threaded necks.
5Heat treatment of bladder of steel C60 to ensure the required mechanical properties of steel and necessary in the operation of the structural strength of cylinders:
Cm. item 5 in table 1Cm. item 5 in table 1
6The main parameters of the second dvukhgolovogo pressure vessel for compressed gases, obtained by direct redistribution of to the of Cusa projectile F-412 caliber 100 mm:
Working pressure is 20 MPa
The capacity of 0.7 l
Weight - 1.8 kg
Length - 500 mm
The outer diameter of 70 mm
Bottom thickness - 3 mm
7Construction of two vessels above from one building 53 OF caliber 100 mm ensures the utilization of the metal original body by 85%.
8In accordance with the rules of PB 03-576-03 vessels were subjected to acceptance tests.

The results of the acceptance test for dvuhgrosovij vessels operating pressure of 20 MPa, made of shells shells 53 OF 412 caliber 100 mm of the proposed method.

Table 4.
No.TestsThe value of the characteristics and results of tests
1The test material of the vessel in tension, GOST 10006, GOST 9012Tensile strength >650 MPa
The yield strength of >471 MPa
Elongation >30%
The relative narrowing of >60%
2The test material of the vessel at the bend, ISO 11439Cracks are not detected
3The test material of the vessel on impact strength, GOST 9454KCV-50°C, 150/2/5>68

J/cm2
4Metallographic determination of thickness de-carbonized layer, GOST 1763The thickness of the de-carbonized layer is not more than 5% of the thickness of the wall structure of steel-granular sorbent
5Ultrasonic flaw detection, GOST 17410Metallurgical defects (pores, cracks, etc.) not detected
6Hydraulic test vessel test pressure of 30 MPaStrains not detected
7Pneumatic test vessels leak pressure of 20 MPaThe leak was not detected
8Hydraulic test to destruction to confirm the required factor of safety less than 2.6. GOST 2405The actual pressure destruction 58,0 MPa, the fracture behavior of shatterproof
9Hydraulic cyclic test pressure is 0.2 MPa to 25 MPa, the frequency of loads 10 cycles per minute, ISO 11439.After 40 000 cycles leakage and destruction of the vessel was not detected
The test results are positive, the vessels comply with the requirements of the IB 03-576-03, GOST 949

Example 2. Disposal rasaratnam corps artillery high-explosive projectile F-412 caliber 100 mm, without copper lead belt, a length of 430 mm, weight 13,1 kg achieved by redistribution in the cylinder at high pressure working pressure 20 MPa, with a capacity of 4 l, is set forth below.

Table 5
No.The basic technological operations and technological parametersThe processing mode
1By ogival part of the body on a band saw cut part of the housing length 130 mm as blanks for the manufacture of cylinder used part of the housing with a bottom length of 300 mm and a weight of 10.6 kg
2Hot plastic deformation of the workpiece from the body of the projectile 630-ton hydraulic press with providing for the first transition:The temperature of 950-1100°
-hand inner diameter korpusu 64 mm to 129 mm (100%),the
for the second transition - hood billet from 300 mm to 480 mm
- thinning of the wall thickness for the two transitions from 17.5 mm to 5.5 mm with provision of the varying wall thickness of the cylindrical and the bottom part within 0.3 mm
- formation of bottom thickness up to 6 mm
3Hot-sealing the mouth of the vessel on mechanized machine seaming rollerInduction heating of the open end of the workpiece to 950-1100°
4Machining the neckline and bottom of the cylinder on a lathe to form a contour of the neck is threaded and the outer contour of the bottom of the product
5Heat treatment of bladder of steel C60 to ensure the required mechanical properties of steel and necessary in the operation of constructive
the strength of the cylinders.Cm. item 5 table 1
Cm. item 5 table 1
6The main parameters of the pressure vessel with a single nozzle for compressed gases, obtained by direct redistribution from the body of the projectile F-412 Calibra mm for the version stamping 630-ton press:
Working pressure is 20 MPa
Capacity 4 l
Weight 9.6 kg
Length of 415 mm
The outer diameter -140 mm
Wall thickness - 5.5 mm
Bottom thickness - 6 mm
7In accordance with the rules of PB 03-576-03 vessels were subjected to acceptance tests.

1. A method of manufacturing pressure vessels, including the production of billets, hot plastic deformation, hot forming necks of vessels, mechanical processing of the necks of the vessels, and heat treatment of the obtained products to provide the required structural strength of the pressure vessel, characterized in that as the blanks use the buildings disposed of artillery shrapnel and high-explosive shells with a detached belt, each of which is cut in the coupling zone arched and cylindrical parts with the receipt of two half - cone with a through hole and a hundred is anomalnoi with a bottom, hot plastic deformation, hot forming necks of vessels, mechanical processing of the necks of the vessels, and thermal processing of workpieces carried out separately, when this heat treatment is carried out in the following mode: hardening temperature 820-850°With cooling water, tempering at a temperature 580-680°aged within 2-6 h with cooling in water.

2. The method according to claim 1, characterized in that Stakhanovites billet form the hull of the first vessel with a bottom and neck.

3. The method according to claim 1, characterized in that the conical workpiece to form the hull of the second vessel with two necks.

4. The method according to claim 1, characterized in that in the manufacture of the pressure vessel from Stakhanovites billet additionally carry out machining of the outer contour of the bottom of the vessel.



 

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