WO2013191323A1 - Procédé de moulage d'un conteneur de stockage sphérique à partir d'une tôle épaisse d'aluminium - Google Patents

Procédé de moulage d'un conteneur de stockage sphérique à partir d'une tôle épaisse d'aluminium Download PDF

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Publication number
WO2013191323A1
WO2013191323A1 PCT/KR2012/006066 KR2012006066W WO2013191323A1 WO 2013191323 A1 WO2013191323 A1 WO 2013191323A1 KR 2012006066 W KR2012006066 W KR 2012006066W WO 2013191323 A1 WO2013191323 A1 WO 2013191323A1
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WO
WIPO (PCT)
Prior art keywords
plate
curvature
storage container
aluminum
punch
Prior art date
Application number
PCT/KR2012/006066
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English (en)
Korean (ko)
Inventor
윤종헌
이정환
Original Assignee
한국기계연구원
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Filing date
Publication date
Application filed by 한국기계연구원 filed Critical 한국기계연구원
Publication of WO2013191323A1 publication Critical patent/WO2013191323A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/02—Making hollow objects characterised by the structure of the objects
    • B21D51/08—Making hollow objects characterised by the structure of the objects ball-shaped objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/18—Making hollow objects characterised by the use of the objects vessels, e.g. tubs, vats, tanks, sinks, or the like

Definitions

  • the present invention relates to a method for forming a spherical shape storage container using an aluminum thick plate, and more particularly, to a method for forming a spherical shape storage container using an aluminum thick plate having an internal curvature of a target curvature.
  • Aluminum is a silver-white soft metal, which can be made of thin foil or wire because of its malleability and ductility, and its properties vary depending on the purity. It is often used as a material for wires.
  • aluminum is used as a major material for aircraft, ships and vehicles because of its light and durable characteristics, and easily reacts with oxygen, but after the oxide film is formed, the film is blocked from contact with oxygen, so it does not rust well and is polished. This is often used for parts that need to last long.
  • Aluminum plates are widely used in transport ships that carry liquid gas, such as LNG or LPG, and these liquid gases are liquid gases due to rapid increase in consumption due to high oil prices and reactor accidents.
  • the demand for transport ships for transporting the situation is increasing.
  • a liquid gas carrier is a ship that carries liquid gas from a production base to a receiving base. It is usually called an LNG ship or an LPG ship, or an LG Carrier or an LPG Carrier, depending on the type of liquid gas. Also called).
  • Liquefied natural gas for example, is a gas obtained by liquefying natural gas mainly composed of methane at sub-atmospheric pressure of 162 ° C.
  • the volume ratio of liquid and gas is about 1/600, and the specific gravity of the liquefied state is 0.43 to 0.50.
  • the LNG ship is divided into independent tank type and membrane type according to the shape of the cargo hold, the independent tank type is designed to have a double structure of the tank in which the LENG is stored, and the independent aluminum sphere tank (sphere) It is made to be independent of the hull.
  • Independent tank type has the advantage of accurate analysis of storage tank stability and reliability.
  • Membrane type can take advantage of relatively inexpensive ship and deck space, freely deforms according to the change of tank capacity, and secures the clock. This has the advantage of reducing the cost and the cost of passage of the Suez Canal.
  • the independent tank type storage tank is constructed by welding a plurality of aluminum plate patches formed with a constant curvature to maintain a spherical shape.
  • the curvature of the curved plate is not constant, a shape of a perfect shape in the welding process is achieved. Since it becomes difficult to assemble the spherical shape, it is necessary to accurately secure the curvature according to the surface forming and to predict the elastic restoration amount of the thick plate due to the spring back.
  • the capacity of the storage tank may be inaccurate and may change the transport capacity of the liquid gas.
  • the Korean Laid-open Patent includes an upper punch fixedly installed on a lower surface of a ram reciprocating up and down of a press, and a lower die fixedly installed on an upper surface of a bed under the ram and in contact with the upper punch by lowering the ram.
  • Disclosed is a configuration in which curved surfaces corresponding to each other are formed on the lower surface of the punch and the upper surface of the lower die, respectively, and the curved surface is formed to have the same curvature after the corner forming plate member is bent into a three-dimensional curved surface between the upper punch and the lower die. .
  • Korean Patent Laid-Open Publication No. 2008-0000880 discloses an invention relating to a structure of a bending roller device for three-dimensional molding, and the published patent is capable of storing and transporting crude oil or various gases in a liquid or gaseous state.
  • a three-dimensional forming apparatus for manufacturing a large or elliptical large tank structure installed on a ship and onshore is disclosed.
  • the upper and lower roller shapes may have a convex or concave surface to form a flat member such as ferrous or non-ferrous metal having a predetermined thickness to have a three-dimensional curved surface, thereby effectively producing a three-dimensional curved shape.
  • a flat member such as ferrous or non-ferrous metal having a predetermined thickness to have a three-dimensional curved surface, thereby effectively producing a three-dimensional curved shape.
  • inventions that provide equipment and methods.
  • Another object of the present invention is to provide a method for forming a spherical shape storage container capable of securing a precise molding dimension by reducing the amount of elastic recovery generated after the curved surface of an aluminum thick plate.
  • a method of forming a spherical shape storage container using an aluminum thick plate in the method of forming a spherical shape storage container using an aluminum thick plate according to the present invention, a method of forming a spherical shape storage container while joining a plurality of plates made of aluminum as a main material, wherein the surface supporting the plate is a target. Positioning the plate on a die formed to have a curvature; A second step of compressing the plate by moving a punch formed such that a surface facing the plate has a curvature greater than the target curvature; And a third step of moving the punch to its original position. It is configured to include.
  • a molding method of a spherical shape storage container using an aluminum thick plate is a method of forming a spherical shape while a plurality of plates made of aluminum as a main material are joined to support a plate. Positioning the plate on a die whose surface is formed to have a curvature greater than a target curvature; A second step of compressing the plate by moving a punch formed such that a surface facing the plate has a target curvature; And a third step of moving the punch to its original position. It is configured to include.
  • the inner surface of the storage container is formed to have a target curvature, the internal curvature is formed to be constant, the effect of accurate calculation of storage capacity and loading of the desired capacity You can expect.
  • the internal curvature of the storage container can be expected to reduce the molding load while maintaining a constant, it is possible to expect the effect that the molding of the storage container becomes easier as the molding load is reduced.
  • the curvature and dimensional accuracy of the curved plate forming the storage container can be expected to be improved, and the productivity and work efficiency for manufacturing the storage container such as welding between the curved plate can be expected to be improved.
  • the effect of maintaining the internal pressure of the storage container can be expected to be constant, it is possible to expect the effect of extending the life of the storage container by maintaining a constant internal pressure.
  • FIG. 1 is a perspective view showing a vessel using a storage container molded by a method of forming a spherical shape storage container using an aluminum plate according to an embodiment of the present invention.
  • Figure 2 is a schematic view showing a mold used in the method of forming a spherical shape storage container using an aluminum thick plate according to an embodiment of the present invention.
  • Figure 3 is a partially enlarged view showing the elastic recovery amount measurement position by the molding method of the spherical shape storage container using an aluminum thick plate according to an embodiment of the present invention.
  • Figure 4 is a graph showing the results of measuring the elastic restoring force according to the thickness and size of the aluminum plate by the molding method of the sphere-shaped storage container using the aluminum plate according to an embodiment of the present invention.
  • FIG. 5 is a graph showing the plastic strain in the thickness direction according to the molding method of the spherical shape storage container using an aluminum plate according to an embodiment of the present invention.
  • FIG. 6 is a graph showing a molding load measurement result according to the molding method of the spherical shape storage container using an aluminum thick plate according to an embodiment of the present invention.
  • FIG. 7 is a schematic view showing a state in which a plate is molded by a mold used in the method of forming a spherical shape storage container using an aluminum thick plate according to an embodiment of the present invention.
  • FIG. 8 is a block diagram showing a process according to the molding method of the spherical shape storage container using an aluminum thick plate according to an embodiment of the present invention.
  • FIG. 1 is a perspective view showing a vessel using a storage container molded by the method of forming a spherical shape storage container using an aluminum plate according to an embodiment of the present invention.
  • Liquefied natural gas is a state in which natural gas is liquefied by compressing about 600 times at a temperature of minus 162 ° C. Therefore, the outer wall of the storage container for storing liquefied natural gas is resistant to low temperature brittleness and has excellent corrosion resistance and mechanical properties. I) is mainly used.
  • the aluminum thick plate will be referred to as a metallic plate including a metal plate having a thickness of at least 10 mm of aluminum.
  • the storage container 10 for transporting the liquefied natural gas is formed in the shape of a sphere having a predetermined diameter and having an internal space, and a plurality of vessels are mainly installed in the vessel 1, and the vessel ( The liquid liquefied natural gas is accommodated in the internal space of the storage container 10 installed in 1) and is transported to a desired position by the movement of the vessel 1.
  • the storage container 10 has a diameter of 40m or more on an inner surface thereof to store a large amount of liquid or gaseous storage material in the inner space thereof.
  • a diameter of 40m or more on an inner surface thereof to store a large amount of liquid or gaseous storage material in the inner space thereof.
  • smaller or larger configurations are possible, but larger diameters would be desirable to store large amounts of storage material.
  • the storage container 10 for forming a large internal space is formed by curvedly forming a plurality of plates 20 to form a large curved surface and then joining them to form a shape thereof.
  • the plate 20 formed of a thick aluminum plate is subjected to curved molding at a warm temperature (about 300 °C to 450 °C) in order to reduce the molding load and the elastic recovery amount generated in the large surface forming.
  • FIG. 2 is a schematic view showing a lattice mold used in a method of forming a spherical shape storage container using an aluminum thick plate according to an embodiment of the present invention
  • FIG. 3 is a spherical shape storage using an aluminum thick plate according to an embodiment of the present invention. It is a partial enlarged view which shows the elastic restoring amount measurement position according to the shaping
  • Figure 4 is a graph showing the results of measuring the elastic restoring force according to the thickness and size of the aluminum plate by the method of forming a spherical shape storage container using an aluminum plate according to an embodiment of the present invention
  • Figure 5 is according to an embodiment of the present invention It is a graph which shows the plastic strain generation direction by the shaping
  • Figure 6 is a graph showing the molding load by the molding method of the spherical shape storage container using an aluminum thick plate according to an embodiment of the present invention.
  • a lattice mold is manufactured for actual large-surface molding conditions, and an example of experiment and molding analysis will be described.
  • the aluminum plate to be used for the experiment and molding analysis has a length of 1186 ⁇ 790 mm in length and width.
  • a configuration in which the main material having a thickness of 20 or 30 mm is made of a metal plate in which aluminum is used will be described.
  • the mold is formed by a method of removing stepped steps using precision machining after assembling the lattice mold in order to generate an accurate target curvature and improve the surface quality of the sheet. Will be produced.
  • the thickness of the aluminum plate, the curvature of the mold, and the like to analyze the elastic restoring force and the molding load of the aluminum plate according to the molding conditions and process conditions based on the aluminum plate formed to have a curvature by the lattice-shaped mold For example, the result of the molding analysis by applying the grid spacing of the mold as a variable will be described.
  • the aluminum thick plate pressed by the lattice-shaped mold measures the size after molding of the thick plate in the x-axis direction.
  • the elastic recovery amount can be measured in different directions, but since the curved aluminum sheet has the same curvature in the horizontal, vertical and diagonal directions, the elastic recovery amount is in the x-axis direction, which is the longest side of the aluminum thick plate. It would be desirable to measure.
  • a value of x of 560 mm means a position spaced about 560 mm from the central portion of the storage container 10.
  • the punch curvature is applied differently, i.e., 1/1520 and 1/1530, with respect to the same thickness of the aluminum thick plate, that is, the die curvature (1/1500) of the aluminum thick plate equal to 30 mm.
  • the elastic recovery of the thick plate is tested.
  • case 2 the lower curvature contacting the mold is the same as in case 1, while the upper punch is formed by using a punch with a relatively high curvature, which not only reduces the elastic recovery amount by 14% but also reduces the molding load by 41%. It can be seen that the results.
  • Figure 7 is a schematic diagram showing a state in which the plate is formed by a mold used in the method of forming a spherical shape storage container using an aluminum thick plate according to an embodiment of the present invention
  • Figure 8 is an aluminum according to an embodiment of the present invention It is a block diagram which shows the process by the shaping
  • a first step 31 of positioning the plate 20 on a die is formed such that the surface supporting the plate 20, whose main material is made of aluminum, has a target curvature.
  • the mold pressed to form the curved surface of the plate 20 includes a die 40 for supporting the plate 20 and a punch 50 for pressing the plate 20 supported on the die 40. It is configured by.
  • the die 40 is relatively positioned on the lower side to support the plate 20 placed on the upper side, and the punch 50 is relatively placed on the plate on the lower side ( By pressing 20, the plate 20 is formed in a shape having a curvature.
  • FIG. 7A illustrates an embodiment in which the upper surface of the die 40 has a target curvature
  • FIG. 7B the lower surface of the punch 50 has a target curvature. An embodiment is shown.
  • each plate 20 is formed so that the surface formed to have a target curvature forms the inner surface of the storage container 10 Combined.
  • either the die 40 or the punch 50 is formed to have the same curvature as the target curvature and the plate ( 20).
  • the surface of the die 40 or the surface of the punch 50 that has a surface formed to have the same curvature as the target curvature is formed to have a curvature larger than the target curvature.
  • the die 40 is formed to have an approximately " ⁇ " shape.
  • the upper surface of the die 40 is formed to be recessed upwardly to have the same curvature as the target curvature, the inner surface of the surface that is pressed upwards and is pressed upward while the plate 20 is supported on the upper surface of the die 40
  • the die 40 is molded to have a target curvature corresponding to the top surface of the die 40.
  • the lower surface of the punch 50 for pressing the plate 20 while moving downward from the upper surface of the die 40 formed to have the same curvature as the target curvature is formed by the upper surface of the die 40 It is recessed upwardly to have a curvature larger than the curvature, for example, about 1-50% larger curvature.
  • the surface for forming the inner surface to have the target curvature becomes the upper surface of the die 40, and the upper surface of the die 40 has the same curvature as the target curvature. Is formed.
  • the lower surface of the punch 50 that is pressed in the upper surface direction of the die 40 is formed to have a greater curvature than the upper surface of the die 40. That is, Rd, which is the top curvature of the die 40 shown in the drawing, has a smaller value than Rp, which is the bottom curvature of the punch 50, which is expressed by a formula, where Rd ⁇ Rp.
  • the bottom surface of the punch 50 is recessed downward to have the same curvature as the target curvature so that the recessed surface of the plate 20 has a target curvature. Is formed.
  • the punch 50 When the punch 50 is viewed from the side, the punch 50 is formed to have a substantially " ⁇ " shape, and a surface recessed upwardly of the plate 20, that is, a surface rounded to have a curvature projecting upward is aimed at. In order to have a curvature, the die 40 is installed to have a substantially " ⁇ " shape when viewed from the side.
  • the upper surface of the die 40 positioned below the lower surface of the punch 50 formed to have the same curvature as the target curvature and supporting the plate 20 is more than the curvature formed by the lower surface of the punch 50. It is formed recessed downward to have a large curvature.
  • the surface for forming the recessed surface of the plate 20 to have a target curvature becomes the lower surface of the punch 50, the surface supporting the plate 20 to have a greater curvature than the target curvature. It becomes an upper surface of the die 40 formed.
  • Rd which is the upper surface curvature of the die 40 shown in FIG. 7B
  • Rp which is the lower surface curvature of the punch 50.
  • the plate 20 having the target curvature and the surface being compressed and having a larger curvature than the curvature of the surface having the target curvature (approximately, is formed to have the punch 50 moves and is supported by the die 40).
  • the plate 20 is supported on a surface formed to have a target curvature, and is pressed at a predetermined interval from a surface formed to have a curvature larger than the target curvature.
  • the elastic restoring force generated while forming the plate 20 may be reduced.
  • the reduced elastic restoring force has the advantage that the precise molding is possible, which can be said to have been proved through the various experiments described above.
  • the plurality of plates 20, the main material of which is formed of aluminum, are joined to each other, and the storage container 10 having a spherical shape is welded to the plurality of plates 20 formed to have a target curvature. It is produced by joint bonding by a bonding method such as.
  • the surface supporting the plate 20 the main material is formed of aluminum is formed to have a target curvature, or larger than the target curvature
  • a first step 31 of positioning the plate 20 on the die 40 formed to have a curvature proceeds.
  • the surface on which the plate 20 is pressed is formed to have a target curvature or is formed to have a larger curvature than the target curvature.
  • the second step 32 of pressing the plate 20 by moving the punch 50 is performed.
  • a third step 33 of moving the punch 50 to its original position is performed.
  • the plate 20 may be welded to form an inner surface with a surface having a target curvature.
  • a fourth step 34 of joining joints is further proceeded.
  • a method of forming a storage container having a spherical shape using an aluminum thick plate by moving a punch formed so that a surface facing the plate has a curvature larger than the target curvature, and compressing the plate so that the plate is recessed.
  • the inner surface of 20) is molded to have the same curvature as the target curvature.
  • the inner surface of the storage container has the advantage of being uniform, thereby having the advantage of having a uniform volume of the storage space, and has the advantage of improving safety.
  • the spherical shape storage container using the aluminum plate according to the present invention will be highly applicable to not only the storage container industry but also various related industries.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

La présente invention concerne un procédé pour mouler un conteneur de stockage sphérique en utilisant une tôle épaisse d'aluminium et, plus précisément, un procédé pour mouler un conteneur de stockage sphérique en utilisant une tôle épaisse d'aluminium, dans lequel la courbure à l'intérieur vise une courbure cible. Le procédé pour mouler un conteneur de stockage sphérique en utilisant une tôle épaisse d'aluminium selon la présente invention est un procédé de moulage d'un conteneur de stockage sphérique qui est façonné selon une forme sphérique en permettant de liaisonner une pluralité des plaques faites principalement d'aluminium, et le procédé pour mouler le conteneur de stockage sphérique comprend les étapes consistant à : premièrement mettre en place les plaques sur une matrice qui est formée en permettant à une surface de celle-ci qui soutient les plaques d'avoir une courbure cible ; deuxièmement presser les plaques en déplaçant un poinçon qui est formé en permettant à une surface de celui-ci tournée vers les plaques d'avoir une courbure supérieure à la courbure cible ; et ramener le poinçon à sa position d'origine. Ainsi, selon la présente invention, puisque la courbure intérieure du conteneur de stockage est façonnée pour atteindre la courbure cible, on réduit la force de rappel élastique de telle sorte qu'on peut améliorer le niveau de précision des mesures et il est possible de déterminer une capacité exacte de stockage et de charger la capacité souhaitée.
PCT/KR2012/006066 2012-06-21 2012-07-30 Procédé de moulage d'un conteneur de stockage sphérique à partir d'une tôle épaisse d'aluminium WO2013191323A1 (fr)

Applications Claiming Priority (2)

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KR20120066825 2012-06-21
KR10-2012-0066825 2012-06-21

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WO2013191323A1 true WO2013191323A1 (fr) 2013-12-27

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960010125U (ko) * 1994-09-14 1996-04-12 오리온전기주식회사 섀도우 마스크 성형금형
JPH09122933A (ja) * 1995-10-31 1997-05-13 Kobe Steel Ltd 電磁調理器用容器の製造方法
KR20030021305A (ko) * 2001-09-05 2003-03-15 재단법인 포항산업과학연구원 파형강판을 제작하는 프레싱 다이
KR20090116037A (ko) * 2008-05-06 2009-11-11 현대삼호중공업 주식회사 액화석유가스 운송 선박의 가스 저장탱크용 코너부 형성판부재 3차원곡면 벤딩장치

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960010125U (ko) * 1994-09-14 1996-04-12 오리온전기주식회사 섀도우 마스크 성형금형
JPH09122933A (ja) * 1995-10-31 1997-05-13 Kobe Steel Ltd 電磁調理器用容器の製造方法
KR20030021305A (ko) * 2001-09-05 2003-03-15 재단법인 포항산업과학연구원 파형강판을 제작하는 프레싱 다이
KR20090116037A (ko) * 2008-05-06 2009-11-11 현대삼호중공업 주식회사 액화석유가스 운송 선박의 가스 저장탱크용 코너부 형성판부재 3차원곡면 벤딩장치

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