US20100011830A1 - Device and method for producing a hollow body from a workpiece in the form of a round blank - Google Patents

Device and method for producing a hollow body from a workpiece in the form of a round blank Download PDF

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Publication number
US20100011830A1
US20100011830A1 US12/310,231 US31023107A US2010011830A1 US 20100011830 A1 US20100011830 A1 US 20100011830A1 US 31023107 A US31023107 A US 31023107A US 2010011830 A1 US2010011830 A1 US 2010011830A1
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United States
Prior art keywords
forming
workpiece
pressing
pressing element
mandrel
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Abandoned
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US12/310,231
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English (en)
Inventor
Werner Huetter
Benedikt Nillies
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Leifeld Metal Spinning GmbH
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Individual
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Assigned to LEIFELD METAL SPINNING GMBH reassignment LEIFELD METAL SPINNING GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HUETTER, WERNER, NILLIES, BENEDIKT
Publication of US20100011830A1 publication Critical patent/US20100011830A1/en
Abandoned legal-status Critical Current

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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
    • B21D22/14—Spinning
    • B21D22/16—Spinning over shaping mandrels or formers
    • 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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • 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
    • B21D51/24—Making hollow objects characterised by the use of the objects high-pressure containers, e.g. boilers, bottles
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/86—Making other particular articles other parts for bicycles or motorcycles

Definitions

  • the invention relates to a device for producing a hollow body from a workpiece in the shape of a circular blank, in particular a spinning/flow-forming machine, comprising a forming mandrel which is supported in a rotationally driven manner about an axis of rotation, a pressing element which is supported about the axis of rotation in a rotatable manner and in an axially displaceable manner relative to the forming mandrel for clamping the workpiece, and at least one forming roller which can be fed axially and/or radially to the forming mandrel.
  • the invention further relates to a method for producing a hollow body from a workpiece in the shape of a circular blank.
  • Pressure containers that have to withstand a filling pressure of up to several hundred bars are used for compressible or liquid gases, such as CNG (compressed natural gas), LNG (liquefied natural gas) or high-pressure hydrogen gas.
  • CNG compressed natural gas
  • LNG liquefied natural gas
  • high-pressure hydrogen gas a gas that is used for compressible or liquid gases, such as CNG (compressed natural gas), LNG (liquefied natural gas) or high-pressure hydrogen gas.
  • the pressure containers are used for instance in motor vehicles as pressurized gas bottles for natural gas tanks and for the hydrogen supply of fuel cells.
  • DE 25 17 971 teaches the production of gas bottles from a block.
  • This block is punched on a press in such a manner that a base part remains and in this way it is formed into a hollow cylinder with a base located on one side.
  • Said hollow cylinder is then formed into a gas bottle blank and is subsequently cold stretched into the final shape on a flow-forming machine.
  • the object of the invention is to provide a device and a method for producing a hollow body, in particular a pressure container, from a workpiece in the shape of a circular blank, by means of which especially stable and tight hollow bodies can be produced in a simple and economical way.
  • the device according to the invention is characterized in that on the pressing element at least one forming die is arranged, which can be moved axially relative to the forming mandrel for forming the workpiece and in that the forming die can be displaced axially relative to the pressing element.
  • a first fundamental idea of the invention resides in the fact that an additional forming die is arranged on a spinning and/or flow-forming machine such that through axial movement of the die and/or the forming mandrel the workpiece can be drawn into the die and thereby be formed.
  • This renders it possible for the workpiece clamped in the machine to be formed in one and the same setting in a deep-drawing or pressing operation and in a spinning and/or flow forming operation.
  • a base portion of the hollow body can be formed in the forming die and through subsequent flow-forming a cylindrical wall portion and/or a neck portion of the hollow body can be formed to completion.
  • the forming die is provided in an axially displaceable manner on the pressing element. In this way it is possible to retract the forming die from the front face of the pressing element and the workpiece after deep drawing or pressing so that the said forming die does not obstruct the feeding of the at least one forming roller. As a result, especially workpiece portions that have been formed beforehand through deep drawing or pressing can then be processed further by spinning or flow-forming without the necessity to reclamp the workpiece in a laborious way.
  • the device according to the invention allows for an especially easy, quick and therefore economical production of the hollow body. Compared to other forming methods it is possible to cut down on method steps such as intermediate annealing and etching as well as bonderizing required for descaling.
  • the method according to the invention is considerably cheaper.
  • the flat sheet metal required as starting material can not only be procured at a lower price but is also freely available in a great variety of sheet thicknesses.
  • a limitation of the container diameter to the tube diameters offered does not exist.
  • any chosen diameter/wall thickness ratio can therefore be adjusted. Consequently, a high degree of flexibility is provided.
  • individual portions of the container can be freely adjusted in their wall thickness.
  • substantially lower investment costs are incurred for the method according to the invention.
  • the device according to the invention can be employed with a high degree of flexibility for a great variety of workpieces.
  • the forming die surrounds the pressing element in a ring-like manner.
  • the forming die has an inner contour that tapers with respect to an increasing axial distance from the extended forming mandrel.
  • the pressing element is preferably arranged in the crown of the inner contour of the forming die.
  • the pressing element can have e.g. a convex, a concave or a plane front surface.
  • the forming die can be displaced in such a manner that, when located in a working position, it protrudes axially from the front face of the pressing element directed towards the forming mandrel and, in a retracted position, it is set backwards axially with respect to this front face.
  • the contour of the front face of the pressing element is adjacent flush to the inner contour of the forming die.
  • the versatility and working speed of the device according to the invention can be increased in that in the forming mandrel and/or in the pressing element a stamp is arranged, which can be moved frontally out of the forming mandrel or the pressing element, respectively, for carrying out a forming operation.
  • a stamp can be used for example for forming a container neck.
  • the stamp can be displaced axially, i.e. in the direction of the axis of rotation, in which case it is suitable for the axis of rotation to extend centrally through the stamp.
  • the versatility of the device according to the invention can be increased further in that the forming die has several die elements that can be moved axially relative to one another. As a result, it is possible to successively carry out several different forming operations in the same setting.
  • the die elements are arranged coaxially and/or surround one another in a ring-like manner.
  • a base portion of the hollow body to be formed through deep drawing or pressing in a central portion of the workpiece and for an external portion of the workpiece, which has been set into rotation, to be folded over, in particular flow-formed into a cylindrical shape by feeding at least one forming roller.
  • the method can be carried out in particular by means of a device in accordance with the invention, in which case the advantages set out in this connection can be achieved.
  • Another fundamental idea of the invention can be regarded in the fact that for the production of the hollow body the workpiece in the shape of a circular blank is first of all processed in its centre by being moved into a forming die.
  • the external portion of the workpiece can remain unformed or it can also be folded over e.g. into a preform preferably truncated cone-like. In a subsequent spinning or flow-forming method the external portion is then folded over into a cylindrical shape.
  • the economical aspect of the method according to the invention can be ascribed inter alia to the use of circular blanks that are available at low cost in finely graded thicknesses with a good surface quality and with minimum tolerance.
  • the deep drawing or pressing according to the invention can include one or several forming operations. According to the invention this can take place while the workpiece is at standstill, by preference, also when the workpiece is rotated.
  • the processing speed can be increased further in that the deep drawing or pressing of the central portion and the folding-over of the external portion are carried out in the same setting.
  • use is advantageously made of a spinning/flow-forming machine, in which a forming die is arranged on the front ahead of the forming mandrel.
  • a device according to the invention is employed.
  • the economical aspect of the method can be enhanced further by the fact that during deep drawing or pressing the external portion is formed in particular in a funnel-like manner.
  • the external portion is made into a preform during deep drawing or pressing and is thereafter folded over into the cylindrical shape by means of a forming roller.
  • the workpiece is heated before the deep drawing or pressing.
  • the external portion can be formed particularly well.
  • a funnel-like shape can be understood in particular as a rotationally symmetrical shape having a tapering cross-section, in which case the wall can extend in the longitudinal section in a convex, concave or straight manner so that in particular a conical shape is present.
  • An especially high quality of the hollow body can be achieved in that the external portion is supported during the deep drawing or pressing.
  • a preferably ring-shaped hold-down fixture can be provided that is applied to the workpiece on the side facing away from the forming die.
  • at least one supporting roller can be provided.
  • at least a pair of supporting rollers can be provided, in which case then it is suitable for the workpiece to be guided through in the external portion between two adjacent supporting rollers of the supporting roller pair.
  • at least one forming roller can be fed that supports the workpiece. If rollers are provided for the support, the workpiece is suitably rotated at low speed during the deep drawing or pressing.
  • especially well-defined wall thicknesses result from the fact that, during folding-over or at least in a further roller pass, the workpiece is stretch-formed in the portion of the cylindrical shape. It is possible to adjust a defined wall thickness or a defined cold work-hardening.
  • a change of the wall thickness is produced in an end portion of the cylindrical shape, in particular through split adjustment.
  • a small reduction of the wall thickness can be employed for the production of a container neck and/or a connecting piece for filling.
  • the thickness of the edge is preferably designed in a multi-stage manner.
  • this is then provided if the wall thickness of the cylindrical shape is small and/or is thinned substantially in relation to the starting thickness of the workpiece.
  • An especially versatile method is provided in that during the deep drawing or pressing the wall thickness is changed in the central portion. This can be achieved by an appropriate design of the pressing element and/or the forming die, the forming mandrel as well as the forming speeds and/or the forming force. It is also possible for the wall thickness to be increased.
  • a preform designed as a punched circular blank with a nose formed thereon is used for the deep drawing or pressing.
  • use can be made for example of preforms consisting of punched circular blanks with or without central bore, with or without nose, with or without container base formed thereon and/or conical or cup-like preforms.
  • the workpiece before the deep drawing or pressing the workpiece is heated in particular to a forming temperature above the recrystallization temperature. Additionally or alternatively, provision can be made for heating before or after the folding-over, stretch-forming and/or a reduction of the cylindrical shape. This can take place with known heating devices, such as gas burners or an inductive heating device. Preferably, the forming mandrel and/or the die can also be heated by an internal heating device.
  • the hollow body can be designed as a gas container in an economical and rapid way.
  • FIGS. 1 to 5 show method steps during the implementation of the method according to the invention with a device according to the invention
  • FIG. 6 shows the method step of FIG. 3 in a differently designed device according to the invention
  • FIGS. 7 to 10 show method steps of the method according to the invention in accordance with a first variant with a device according to the invention
  • FIG. 11 shows the method step of FIG. 7 in a differently designed device according to the invention.
  • FIGS. 12 to 17 show method steps of the method according to the invention in accordance with a second variant with a device according to the invention
  • FIGS. 18 and 19 show method steps of the method according to the invention in accordance with a third variant with a device according to the invention.
  • FIGS. 20 and 21 show method steps of a fourth variant of the method according to the invention with a device according to the invention
  • FIGS. 22 to 26 show method steps of a fifth variant of the method according to the invention with a device according to the invention
  • FIGS. 27 to 29 show a further method variant in accordance with the invention.
  • FIGS. 30 to 32 show another method variant in accordance with the invention.
  • FIGS. 33 to 35 show a further embodiment according to the invention for forming a material accumulation on a container
  • FIGS. 36 to 38 show method steps of a further variant of the method according to the invention with a device according to the invention
  • FIGS. 39 to 42 show method steps of a different variant of the method according to the invention.
  • FIG. 43 shows method steps of the method according to the invention in accordance with a further variant
  • FIGS. 44 and 45 show method steps during the implementation of the method according to the invention with a device according to the invention in accordance with a further variant
  • FIG. 46 shows finishing method steps in the production of a gas container.
  • FIGS. 1 to 5 method steps of a method according to the invention with a device according to the invention in accordance with a first embodiment are shown.
  • a workpiece 1 in the shape of a circular blank is initially heated to forming temperature in a supply device 51 with a holder ( FIG. 1 ).
  • the supply device 51 can have e.g. a furnace, a flame generating device and/or an induction device.
  • the spinning/flow-forming machine has a forming mandrel 11 as well as a pressing element 18 that lies frontally opposite the forming mandrel 11 .
  • the forming mandrel 11 and the pressing element 18 are arranged on a machine bed, not illustrated here, such that they can be driven in a rotating manner about an axis of rotation 10 and can be displaced axially relative to one another.
  • the pressing element 18 is surrounded by a ring-like forming die 40 that can be displaced relative to the pressing element 18 between a forming position shown in FIGS. 2 and 3 and a retracted position shown in FIGS. 4 and 5 . In the forming position the forming die 40 protrudes axially from the pressing element 18 in the direction of the forming mandrel 11 .
  • the pressing element 18 and the forming die 40 can be designed in particular as a hydraulically actuated pressing unit.
  • the workpiece 1 is clamped between the forming mandrel 11 , which contains the inner shape of the finished hollow body, at least of its base, and the forming die 40 , which contains together with the pressing element 18 the outer shape of the finished hollow body, at least in the portion of the container base.
  • the pressing element 18 can be designed at its front face in a concave ( FIG. 3 ), convex ( FIG. 6 ) or plane manner (not illustrated). More particularly, an arched or circular contour can be provided.
  • the forming mandrel 11 is then moved axially into the forming die 40 , with this relative movement being preferably carried out through a simultaneous movement of the pressing element 18 and the forming die 40 on the machine bed while the forming mandrel 11 is stationary.
  • the base portion of the hollow body is formed in one forming operation in a central portion 4 of the workpiece 1 .
  • an external portion 5 located further outwards in the radial direction is formed into a cone-shaped shell ( FIG. 3 ).
  • the forming die 40 on the pressing element 18 is retracted axially from the forming mandrel 11 and is thereby taken out of the working area.
  • the pressing element 18 which is arranged in the centre of the forming die 40 and has at its front face a pressing disk with a smaller diameter as compared to the forming die 40 , continues to press the workpiece 1 in the base portion against the forming mandrel 11 .
  • the forming mandrel 11 , the pressing element 18 and the workpiece 1 clamped inbetween are then set into rotation about the axis of rotation 10 and at least one forming roller 31 designed as a flow-forming roller is fed to the workpiece 1 .
  • the external portion 5 is bent into a cylindrical shape 8 towards the forming mandrel 11 , is stretch-formed ( FIG. 5 ) and stripped off the forming mandrel 11 by means of a stripping device not shown here.
  • This method can be employed in particular in the case of a medium thickness of the circular blank, a material that is easy to form and in the case of circular blanks having a medium overlap.
  • a supplementary heating can be provided during the processing with the at least one forming roller 31 .
  • FIGS. 7 to 10 a variant of the method according to the invention is explained.
  • the entire workpiece 1 is formed during the pressing and/or deep drawing
  • the external portion 5 of the workpiece 1 remains unformed, i.e. only a part of the workpiece undergoes forming.
  • the external portion 5 is first of all folded over cylindrically by at least one forming roller 31 designed as a flow-forming roller and is subsequently stretch-formed to the final dimensions in at least one roller over-run ( FIG. 10 ) by means of flow-forming.
  • This method variant is especially suitable for circular blanks having a smaller overlap and therefore for smaller containers.
  • the pressing element 18 can have a convex ( FIG. 11 ) or concave ( FIG. 7 ) design depending on the desired base shape.
  • FIGS. 12 to 17 A further method variant which is particularly suitable for large workpiece thicknesses and/or for materials that are difficult to process is illustrated in FIGS. 12 to 17 .
  • the workpiece is only formed in the central portion 4 in the initial forming operation, while the external portion 5 lying further outwards in the radial direction remains unformed ( FIGS. 12 and 13 ).
  • the funnel-shaped preform can have a constant or a varying wall thickness.
  • the external portion 5 of the workpiece 1 is foldedover adjacent to the forming mandrel 1 and is formed into a cylindrical shape 8 . In doing so, it can be ensured that a sufficient amount of material is available for the subsequent forming of a second container base as well as for a connecting piece arranged thereon.
  • the cylindrical shape 8 is stretch-formed to the final dimensions through flow-forming in at least one roller over-run.
  • FIGS. 18 and 19 Another method variant is shown in FIGS. 18 and 19 .
  • this method variant only the central portion 4 of the workpiece 1 is initially formed during the pressing or deep drawing.
  • the workpiece 1 to be rotated at low speed during the forming operation and for the external portion 5 to be supported by means of supporting rollers 61 , 62 .
  • the supporting rollers 61 , 62 constitute a supporting roller pair, in which case one supporting roller 61 supports the workpiece 1 on the side of the pressing element 18 and an adjacent supporting roller 62 supports it on the side of the forming mandrel 11 .
  • the axes of rotation of the supporting rollers 61 , 62 extend perpendicularly to the axis of rotation 10 of the workpiece 1 .
  • a forming roller 31 is fed during the first forming operation to the external portion 5 of the workpiece 1 on the side of the pressing element 18 and the workpiece 1 is rotated at low speed.
  • a device for the method variant depicted in FIGS. 22 to 24 , in which a stamp 13 is provided, which is located centrally in the forming mandrel 11 and can be moved axially relative to the said forming mandrel 11 .
  • a recess 14 corresponding to the stamp 13 is provided in the pressing element 18 .
  • the stamp 13 is moved frontally out of the forming mandrel 11 into the recess 14 .
  • this forming operation effected out of the forming mandrel 11 towards the pressing element 18 a container nose can be formed. If required, said container nose can then be formed to size by a forming roller.
  • the forming die is retracted so as to provide a free space for a subsequent forming roller 31 .
  • a selected wall thickness distribution 28 is produced through split adjustment of the forming roller 31 during the stretch-forming.
  • the outer edge of the workpiece 1 can be formed into a conical shape by means of a forming roller 31 through projected forming in the axial direction, as illustrated in FIG. 28 .
  • the workpiece preformed in this way can then be folded over onto the forming mandrel 11 and stretch-formed in its wall thickness and finish-formed to the cylindrical shape 8 by means of the forming roller 31 .
  • FIGS. 30 to 32 Another alternative is shown in FIGS. 30 to 32 .
  • the workpiece 1 is formed by means of the forming roller 31 into a bell-shaped or funnel-shaped preform in one or several roller passes, as can be clearly taken from FIG. 31 .
  • the folding-over and final forming of the cylindrical shape 8 takes place by means of the forming roller 31 .
  • FIGS. 33 to 35 a method variant is shown, in which an accumulation of material 3 can be formed out centrally on the workpiece 1 by means of a forming roller 31 , which can be used for example for a container connection.
  • a forming roller 31 In an external portion of the workpiece the forming roller 31 is pressed into the wall of the workpiece and moved towards the pressing element 18 .
  • the displaced or partially separated material is shifted by the pressing element 18 , which can move aside according to the invention in the axial direction and thereby provide a free space for the material accumulation 3 .
  • a threaded bore for a valve element can be applied to the material accumulation 3 .
  • a preform designed as a punched circular blank with a nose 2 formed thereon is used as a workpiece for the deep drawing or pressing.
  • This preform is heated in the supply device 51 ( FIG. 36 ).
  • the container base is designed by a forming operation ( FIGS. 37 and 38 ).
  • the pressing element 18 has a recess 14 at the front face, which receives the nose 2 during the forming operation.
  • the nose 2 can serve as a container connection.
  • the deep drawing or pressing for the forming the base portion of the hollow body ( FIG. 40 ) and the ensuing folding-over of the external portion 5 ( FIG. 42 ) are carried out in different settings.
  • a respective heating step can be provided both before the deep drawing or pressing as well as before the flow-forming ( FIG. 39 and respectively FIG. 41 ).
  • a heating device with a holder as well as a forming tool are provided in the supply device 51 .
  • a device according to the invention in which the forming die 40 has two coaxially arranged die elements 41 , 42 that can be displaced axially relative to each other.
  • the outer die element 42 is arranged such that it is aligned at the front face with the inner die element 41 . In this way the workpiece 1 is supported in its external portion 5 by the die element 42 .
  • the forming mandrel 11 is entered into the first die element 41 .
  • the inner, first die element 41 is retracted from the forming mandrel 11 and the second, outer die element 42 is advanced.
  • the forming mandrel 11 also enters into the conical opening of the second die element 42 , whereby the external portion 5 of the workpiece 1 is folded over in a funnel-shaped manner.
  • the outer die element 42 can then also be retracted from the forming mandrel 11 and the external portion 5 can be folded over cylindrically through flow-forming.
  • FIG. 46 shows a further method step that can be provided for closing the hollow body after the forming of the cylindrical shape 8 .
  • the workpiece 1 is heated to forming temperature, clamped at its base portion by a chuck into a spin-draw-in machine and is set into rotation.
  • the end portion 7 of the workpiece 1 is then closed, if required upon an additional supply of heat, by a pivotable draw-in roller 38 in at least one pass to a container neck with nose ( FIG. 46 on the right side) or without nose ( FIG. 46 at the centre).
  • the wall thickness of the container neck can be chosen thinner, equally thick or thicker than the starting thickness of the workpiece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US12/310,231 2006-08-24 2007-08-09 Device and method for producing a hollow body from a workpiece in the form of a round blank Abandoned US20100011830A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102006039656.1 2006-08-24
DE102006039656A DE102006039656B4 (de) 2006-08-24 2006-08-24 Vorrichtung und Verfahren zum Herstellen eines Hohlkörpers aus einem rondenförmigen Werkstück
PCT/EP2007/007067 WO2008022715A1 (de) 2006-08-24 2007-08-09 Vorrichtung und verfahren zum herstellen eines hohlkörpers aus einem rondenförmigen werkstück

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US20100011830A1 true US20100011830A1 (en) 2010-01-21

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US12/310,231 Abandoned US20100011830A1 (en) 2006-08-24 2007-08-09 Device and method for producing a hollow body from a workpiece in the form of a round blank

Country Status (8)

Country Link
US (1) US20100011830A1 (de)
KR (1) KR20090066268A (de)
CN (1) CN101528376B (de)
BR (1) BRPI0716581A2 (de)
DE (1) DE102006039656B4 (de)
MX (1) MX342763B (de)
RU (1) RU2445181C2 (de)
WO (1) WO2008022715A1 (de)

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JP2018144063A (ja) * 2017-03-03 2018-09-20 株式会社三五 スピニング加工方法及び載頭円錐部を端部に有する筒状体
GB2563068A (en) * 2017-06-02 2018-12-05 Gkn Aerospace Services Ltd Friction forming
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US11020784B2 (en) * 2016-03-30 2021-06-01 Wf-Maschinenbau U. Blechformtechnik Gmbh & Co. Kg Method for producing a moulded body comprising a hub and device for carrying out the method
US11325174B2 (en) 2016-08-25 2022-05-10 Winkelmann Powertrain Components Gmbh & Co. Kg Method for the chipless production of a rotationally symmetrical body from a circular sheet metal blank
CN114570851A (zh) * 2022-05-05 2022-06-03 太原科技大学 一种无缝金属气瓶内胆的成形工艺
CN115069921A (zh) * 2022-06-08 2022-09-20 广东省泓沛五金有限公司 全自动气弹开料及连续冲压装置

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DE102009021767B4 (de) * 2009-05-18 2012-06-06 Ssb-Maschinenbau Gmbh Vorrichtung für die Umformung von Aluminiumfelgen
FR2950548B1 (fr) * 2009-09-30 2011-12-30 Farouk Halaimia Fabrication de fuselage monocoque d'aeronefs, troncon monocoque en une seule piece metallique
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DE102010016960A1 (de) * 2010-05-14 2011-11-17 Thyssenkrupp Steel Europe Ag Verfahren zur Herstellung von Hohlprofilen mit einem Längsflansch
CN101961745A (zh) * 2010-08-27 2011-02-02 芜湖众发旋压技术有限公司 一种旋压成形两工件的方法及使用该方法的模具组
CN102728688A (zh) * 2011-04-01 2012-10-17 北京超代成科技有限公司 一种金属板料底面单边压型的无切削加工方法及装置
ES2532217T3 (es) * 2012-04-20 2015-03-25 Leifeld Metal Spinning Ag Procedimiento y dispositivo para la conformación de una pieza de trabajo
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DE102006039656A1 (de) 2008-02-28
RU2445181C2 (ru) 2012-03-20
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BRPI0716581A2 (pt) 2013-10-08
CN101528376A (zh) 2009-09-09
RU2009105676A (ru) 2010-09-27
MX2009001979A (es) 2009-05-28
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CN101528376B (zh) 2012-06-27
WO2008022715A1 (de) 2008-02-28

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