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WO2004096457A1 - Dispositif de laminage-extrusion et procede permettant de produire un tube creux a compartiments multiples forme a partir de plaques metalliques - Google Patents

Dispositif de laminage-extrusion et procede permettant de produire un tube creux a compartiments multiples forme a partir de plaques metalliques Download PDF

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Publication number
WO2004096457A1
WO2004096457A1 PCT/KR2004/001000 KR2004001000W WO2004096457A1 WO 2004096457 A1 WO2004096457 A1 WO 2004096457A1 KR 2004001000 W KR2004001000 W KR 2004001000W WO 2004096457 A1 WO2004096457 A1 WO 2004096457A1
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WIPO (PCT)
Prior art keywords
roller
legs
shaped
cavityo
female
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Ceased
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PCT/KR2004/001000
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English (en)
Inventor
Youngae An
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/08Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C25/00Profiling tools for metal extruding
    • B21C25/02Dies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/02Making uncoated products
    • B21C23/04Making uncoated products by direct extrusion
    • B21C23/14Making other products
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C35/00Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels for metal extruding
    • B21C35/02Removing or drawing-off work
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C35/00Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels for metal extruding
    • B21C35/02Removing or drawing-off work
    • B21C35/023Work treatment directly following extrusion, e.g. further deformation or surface treatment 

Definitions

  • metal plate multi-cell hollow tube can be made by extru-rolling and pressure-welding method using two or more hot metal sheets with the extru-rolling and pressure-welding device which consists of a pair of shaped rollers and multi-legs mandrel and wall removal mandrel without additional welding process.
  • Wide and thin plate type tube has shape difficult to form by extrusion process due to high forming pressure, but it has shape easy to form by rolling process instead of extrusion process because of low forming pressure.
  • the present invention uses new process that extruding and rolling and pressure- welding process are combined by using two or more metal sheets for making of hollow tube.
  • Rolling process is a kind of metal forming method that can make a thin and wide sheet from one metal slab with comparatively thick thickness.
  • the advantage of rolling process is that it can make product with simple section by continuously thinning and lengthening one metal slab, and in recent days, it becomes to make products with complex section by roll-forming process step by step with sequent rollers. But because it is impossible to make product with hollow part or cavity untouched with rollers by rolling process, it needs another forming process.
  • it is general to make hollow tube by adding arc-welding process directly after roll- forming process that can make such shape as circular pipe by rolling a metal sheet with sequent rollers.
  • extrusion process has advantage in making product with hollow tube of complex section, but it has limitation of productivity because of high forming pressure and high cost of dies.
  • the present invention uses a method of making hollow tube with multi-cell by a extru-rolling and pressure-welding process using mandrel with multi-legs and using two or more metal sheets as material.
  • the purpose of the present invention is that wide and thin plate hollow tube with multi-cell which is difficult to form by conventional extrusion process or rolling process can be manufactured by a extru- rolling and pressure-welding process that makes hollow tube by inserting multi-legs mandrel between two or more hot metal sheets when the two metal sheets are extru-rolled and pressure-welded by shaped rollers without additional welding process.
  • the process can be applied to increase bending strength of metal plate for structure, and to make mass production of thin and light weighted hollow metal plate with high bending strength possible.
  • the present invention has characteristics; that, in order to extru-roll and pressure-weld two hot coil metal sheets, has rolling process parts consisted of two shaped rollers, female shaped roller and male shaped roller, constructed with roller shape part with same cavity shape as product shape on the surface of shaped rollers; that has two pre-form rollers, female preform roller and male pre-form roller, that makes wall projecting part on each pressure-welding surface of two metal sheets; that has material guide part for inserting two pre-formed metal sheets into roller cavity between roller shape parts; that has multi-legs mandrel inserted in roller cavity between roller shape parts in order to make longitudinal walls and holes of multi-cell hollow tube during extru- rolling and pressure-welding of two metal sheets; that has wall removal mandrel in order to stop forming wall for
  • Figure 1 is a perspective overall view of extru-rolling and pressure-welding device assembly for metal plate multi-cell hollow tube
  • Figure 2 is a perspective view of the material flow of metal sheets in extru-rolling and pressure-welding process for metal plate multi- cell hollow tube;
  • Figure 3 is a perspective view of female and male shaped roller and female and male pre-form roller assembly
  • Figure 4 is a perspective view of hollow forming part assembly with pre-form roller and material guide part;
  • Figure 5 is a perspective view of multi-legs mandrel and wall removal mandrel assembly;
  • Figure 6 is a perspective view of "wall removal mandrel and crankshaft assembly
  • Figure 7 is a perspective view of wall removal mandrel and cam assembly
  • Figure 8 is a perspective view of hollow forming part assembly with dual multi-legs mandrel and inside metal sheet pre-form roller;
  • Figure 9 is a perspective view of wave wall multi-legs mandrel and hollow forming part assembly
  • Figure 10 is a perspective overall view of extru-rolling and pressure-welding process for metal plate multi-cell hollow tube;
  • Figure 1 1 is a perspective overall view of extru-rolling and pressure-welding process for metal plate multi-cell and perforated wall hollow tube
  • Figure 12 is a perspective overall view of extru-rolling and pressure-welding process for metal plate dual multi-cell hollow tube
  • Figure 13 is a perspective view of the supply of inside metal sheet for metal plate multi-cell and wave wall hollow tube
  • Figure 14 is a view of examples of metal plate multi-cell hollow tube that can be manufactured by the present invention.
  • pre-form rollers Bl female pre-form roller
  • B2 male pre-form roller
  • C material guide part
  • Figure 1 is a perspective overall view of extru-rolling and pressure-welding device assembly of metal plate multi-cell hollow tube(6). It shows extru-rolling and pressure-welding device that has two shaped rollers(A), female shaped roller(Al) and male shaped roller(A2), with roller shape part(2) that has roller cavity(3) same as outer section shape of product on the surface of shaped rollers(A) for extru-rolling and pressure-welding two hot coil metal sheets(l); that has two pre-form rollers(B), female pre-form roller(Bl) and male preform roller(B2), which makes wall projecting part(5) pre-formed on each pressure-welding surface of two metal sheets(l); that has material guide part(C) for inserting two pre-formed metal sheets(4) into roller cavity(3) between roller shape ⁇ arts(2); that has multi-legs mandrel(D) inserted in roller cavity(3) of roller shape part(2) in order to make walls(8) and holes(7) of multi-cell hollow tube(6) during pressure-welding of two
  • Figure 2 is a perspective view of the material flow of metal sheets(l) in extru-rolling and pressure-welding process of metal plate multi-cell hollow tube(6). It shows the material flow of making walls(8) and holes(7) of metal plate multi-cell hollow tube(6) from two hot coiled metal sheet(l), that is, it shows that two hot metal sheets(l) are pre-formed and simultaneously inserted into forming cavity(9) by rotating force of shaped rollers(A) and pre-form rollers(B), and that two pre-formed metal sheet(4) with wall projecting part(5) on each pressure-welding surface of two metal sheets(l) are extru-rolled and pressure-welded and strongly inserted in the multi-legs cavity part(16) of multi-legs mandrel(D) by compressing and rotating force of shaped rollers( ⁇ ).
  • Figure 3 is a perspective view of female and male shaped rollers(A) assembly and female and male pre-form rollers(B) assembly. They show that; female pre-form roller(Bl) contacted with male shaped roller(Al), and the male pre-form roller(B2) contacted with female shaped roller(Al); shaped rollers(A) and pre-form rollers(B) should have such shapes as female and male shape so that two metal sheets can be extru-rolled and pressure-welded in roller cavityO) by compressing and rotating force of shaped rollers( ⁇ ); shaped rollers(A) has roller cavity(3) constructed with roller shape parts(2) same as shape of product on the surface of shaped rollers(A) ; and, in order to prevent side flowing of inserted material in roller cavity(3), they should have female and male shape on roller shape parts(2) in order to construct roller cavity(3) by side walls of female shaped roller(Al) and upper surface of male shaped roller(A2); and, in order to prevent backward flowing of inserted material in roller cavity(3), the forming cavity
  • Figure 4 is a perspective view of hollow forming part(H) assembly with male pre-form rollers(B2) and material guide part(C). It shows that; hollow forming part(H) has male pre-form roller(B2) contacted with female shaped roller(Al), and the female pre-form roller(B l ) contacted with male shaped roller(A2); wall projecting part(5) can be pre-formed by male pre-form roller(B2) cont ⁇ tcted with female shaped roller(Al ), and the pre-formed metal sheets(4) can be supplied easily into material guide part(C), and walls(8) can be formed by pushing material into multi-legs cavity part(16) between legs of multi-legs mandrel( 17) by rotating force of female shaped rollers(Al) and male pre-form rollers(B2); And it shows that material guide part(C) of hollow forming part(H) is placed at the contact place of two metal sheets(l) and prevents backward flowing of material and makes pre-formed metal sheets(4) be guided and supplied into roller cavityO).
  • Figure 5 is a perspective view of multi-legs mandrel(D) and wall removal mandrel(E) assembly. It shows that; multi-legs(17) of same number as number of needed holes(7) are attached on the tip of multi- legs mandrel(D) for the purpose that multi-legs mandrel(D) makes two metal sheets not be pressure-welded in roller cavity(3) during extru- rolling process in order to make multi-holes(7) between two metal sheets( l) ; that legs of wall removal mandrel( 18) are inserted between multi-legs cavity parts( 16) in order to remove the walls(8) between holes(7) instantly, when legs of multi-legs mandrel( 17) make holes(7) and wallsO) of multi-cell hollow tube(6), after materials are inserted into multi-legs cavity parts( 1 6) by compressing force of shaped rollers(A).
  • Figure 6 and figure 7 are a perspective view of wall removal mandrel(E) connected with crankshaft(F) assembly, and wall removal mandrel(E) connected with cam(G) assembly. They show that; the crankshaft(F) or cam(G) are rotated for repeatedly going and returning of wall removal mandrel(E) in order to remove walls(8) instantly ;
  • the shape of leg of wall removal mandrel( 18) is same as leg of multi-legs mandrel( 17) but the number of the legs( 18) is one less than the other legs( 17), and wall removal mandrel(E) is placed inside multi-legs mandrel(D) and the legs of wall removal mandrel( 18) are slid linearly forward and backward between multi-legs cavity ⁇ art( 16) by rotational moving of crankshaft(F) or cam(G); crankshaft(F) or cam(G) is placed in hollow forming part(H) and connected at the other end of wall removal mandrel( 18);
  • Figure 8 is a perspective view of hollow forming part(H) assembly with dual multi-legs mandreKl) and inside metal sheet preform roller(J). It shows that; when two hot pre-formed metal sheets(4) of three hot metal sheets( l) are inserted in both outer side of dual multi-legs mandrel(I) in order to form dual layer holes(7) of product; when one pre-formed metal sheet is transferred in the center cavity of dual multi-legs mandrel(I) and is inserted into roller cavityO) parallel with said two pre-formed metal sheets(4) ; after that wall projecting parts(5) is pre-formed on both side of one inside metal sheet( l ) of said three sheets( l ) by inside metal sheet pre-form roller(J) ; dual multi-legs mandreKl) and inside metal sheet pre- form roller(J) that can make metal plate dual multi-cell hollow tube( 13) with dual layers holes(7) be manufactured by extru-rolling and pressure-welding process that three hot metal pre-formed sheet(4) are extru-rolled
  • Figure 9 is a perspective view of wave wall multi-legs mandrel (K) and hollow forming part(H) assembly. It shows that; when two hot metal sheets(l) of three hot metal sheets(l) are inserted in both outer side of female and male wave wall multi-legs mandrel(K) in order to form holes(7) of product; when wave wall shape sheet(22) is transferred between wave wall multi-legs mandrels(K) and is inserted into roller cavityO) parallel with said two pre-formed metal sheets(4); after that a wave wall metal sheet(22) with punched holes is pre- formed to wave shape sheet by wave wall sheet pre-form roller(L); wave wall multi-legs rnandreKK) and leg of wave wall mandrel(23) that metal plate multi-cell and perforated wave wall hollow tube(21) can be manufactured by process that said two hot metal pre-formed sheet(4) and hot wave wall metal sheet(22) are extru-rolled and pressure- welded in forming cavityO) between female and male roller shape parts(2) and
  • Figure 10 is a perspective overall view of extru-rolling and pressure-welding method of metal plate multi-cell hollow tube(6). It shows extru-rolling and pressure-welding method; that pre-forms wall projecting part(5) on the pressure-welding surface of two hot metal sheets(l) by compressing force of each pre-form rollers(B) and shaped rollers(A); that simultaneously makes pre-formed metal sheet(4) be guided into material guide part(C) by rotating force of shaped rollers(A) and pre-form shaped rollers(B); and, when two preformed metal sheets(4) are inserted into forming cavityO) between multi-legs mandreKD) and female and male roller cavityO) shaped with same shape as product on roller shape part(2); that makes longitudinal holes(7) in the section of plate by legs of multi-legs mandreKD) on the way that two pre-formed hot metal sheet(4) are extru-rolled and pressure-welded strongly between female and male shaped rollers(A) and multi-legs mandreKD).
  • Figure 1 is a perspective overall view of extru-rolling and pressure-welding method of metal plate multi-cell and perforated wall hollow tube(l l). It shows extru-rolling and pressure-welding method that; when two pre-formed metal sheets(l) are extru-rolled and pressure-welded strongly in forming cavityO) between female and male shaped rollers(A) and multi-legs mandreKD, and longitudinal holes(7) in the section of plate are made by legs of multi-legs mandrel(D); and that, by inserting wall removal mandrel(E) repeatedly in multi-legs cavity parts(16) by rotational movement of crankshaft(F) or cam(G) connected with wall removal mandreKE), the forming of wallO) of longitudinal hole(7) stops instantly and it makes walls(8) be perforated and it makes longitudinal holes(7) be connected through perforated holes(19) with each other; and that, by making sequential change of movement of wall removal mandreKE), it makes possible that the location of perforated holes(19) in the
  • Figure 12 is a perspective overall view of extru-rolling and pressure-welding method of metal plate dual multi-cell hollow tube(13). It shows extru-rolling and pressure-welding method; after wall projecting parts(5) are pre-formed on the pressure-welding surface of two metal sheets(l) of three hot metal sheets(l) by each pre-form rollers(B), when said two hot pre-formed metal sheets(l) are inserted in between outer side of dual multi-legs mandreKD and forming cavityO) consisted of female and male roller shape part(2) in order to form dual layer holes(7) of product; after wall projecting partsO) are pre-formed on both side of one inside metal sheet(l) of said three sheets(l) by inside metal sheet pre-form roller(J), when one inside metal sheet(l) is transferred in the center cavity of dual multi-legs mandreKD and is inserted into roller cavityO) parallel with said two pre-formed metal sheets(l); and that metal plate dual multi- cell hollow tube(13) with dual layers of longitudinal holes(7)
  • Figure 13 is a perspective view of the supply of inside metal sheet for metal plate multi-cell and wave wall hollow tube(21). It shows wave wall sheet(22) supply method; when the two hot preformed metal sheets(l) are inserted in roller cavityO) between both side of wave wall multi-legs rnandreKK) and female and male roller shape part(2) in order to form holes(7) of product, after one punched metal sheet(l) are pre-formed to wave shape of wave metal sheet(22) by female and male wave wall sheet pre-form rollers(L); when wave metal sheet(22) is transferred in the center cavity of wave wall multi- legs rnandreKK) and is inserted into roller cavityO) parallel with said two pre-formed metal sheets(l); that supplies metal wave sheet(22) for manufacturing of metal plate multi-cell and wave wall hollow tube(21) in order that said two hot metal pre-formed metal sheet(l) and one hot wave metal sheet(22) with punched holes(19) are extru- rolled and pressure-welded in forming cavityO) between female and male roller shape
  • Figure 1 4 is a view of examples of arbitrary shaped multi-cell hollow tube that can be manufactured by the present invention. It shows examples of arbitrary shaped multi-cell hollow tube(6) with arbitrary shaped longitudinal holes(7); according to used material type of two or more hot metal sheet materials or hot melted materials or plastic materials, after half open hollow tubes are pre-formed by each pre-form rollers(B), when said materials are inserted in forming cavityO) between outer side of multi-legs mandreKD) and roller cavityO) consisted of female and male roller shape part(2) in order to form longitudinal holes(7) of product; or after that wall projecting partsO) are pre-formed on both side of one sheet by inside pre-form roller(J), when the one pre-formed said material is inserted into roller cavityO) parallel with two other pre-formed said material; and which can be manufactured by that all of said pre-formed materials are extru-rolled and pressure-welded together in arbitrary shaped forming cavityO) between arbitrary shaped female and male roller shape parts(2) and arbitrary shaped multi-legs mand
  • rolling process is applicable to making hollow tube with complex section, because hollow tube can be formed by extru-rolling and pressure-welding process using two or more hot metal sheets. And it is applicable to mass production of roll formed pipe with no arc-welding line by extru-rolling and pressure-welding process without additional welding process.
  • structural panels with high bending strength and less weight can be used widely through mass production of metal plate multi-cell tube by extru-rolling and pressure-welding process using two or more metal sheets. And it has high applicability that it can be applied to multi-cell hollow tube using any other kinds of melted materials and plastic material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

L'invention concerne un procédé et un dispositif de laminage/extrusion permettant de former un tube creux à compartiments multiples. On forme ce tube creux à compartiments multiples en introduisant et en laminant deux bandes de métal chauffé dans une cavité de formage, entre un cylindres mâle et un cylindre femelle, et un mandrin multi-éléments, les orifices longitudinaux multiples et les parois étant simultanément soudées par pression. L'invention concerne également un procédé et un dispositif permettant de former les orifices traversants dans les parois longitudinales en empêchant leur soudage instantané par l'introduction et le retrait répétés d'un autre mandrin multi-éléments, servant à supprimer les parois, couplé à un vilebrequin ou à une came, dans et hors de la cavité entre les éléments multiples du mandrin servant à former les orifices.
PCT/KR2004/001000 2003-05-01 2004-04-29 Dispositif de laminage-extrusion et procede permettant de produire un tube creux a compartiments multiples forme a partir de plaques metalliques Ceased WO2004096457A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2003-0027963 2003-05-01
KR10-2003-0027963A KR100498089B1 (ko) 2003-05-01 2003-05-01 금속평판 다구멍중공부재의 압연가공장치 및 압연가공방법

Publications (1)

Publication Number Publication Date
WO2004096457A1 true WO2004096457A1 (fr) 2004-11-11

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PCT/KR2004/001000 Ceased WO2004096457A1 (fr) 2003-05-01 2004-04-29 Dispositif de laminage-extrusion et procede permettant de produire un tube creux a compartiments multiples forme a partir de plaques metalliques

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KR (1) KR100498089B1 (fr)
WO (1) WO2004096457A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102229044A (zh) * 2011-05-06 2011-11-02 西安理工大学 一种宽幅镁合金超薄板材连续挤轧装置及挤轧方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230098980A (ko) 2021-12-27 2023-07-04 수시스템 주식회사 금속 절삭 가공 장치
KR102523328B1 (ko) * 2022-09-28 2023-04-20 (주)탱크마스타 멀티튜브판넬의 종방향 연속 제조장치

Citations (5)

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Publication number Priority date Publication date Assignee Title
US4487049A (en) * 1981-08-04 1984-12-11 Dnepropetrovsky Metallurgichesky Institut Working mandrel and method of rolling elongate hollow pieces in a multi-stand continuous mill on same working mandrel
JPS6054203A (ja) * 1983-09-06 1985-03-28 Nippon Steel Corp 押込み穿孔圧延のガイド装置
US4982487A (en) * 1988-10-27 1991-01-08 Hughes Aircraft Company Metallic component cold roll/crimping tool
US5907969A (en) * 1997-03-19 1999-06-01 Soder; James T. Tool for working shaped, hollow metal tubing to achieve an end reduction
US6070448A (en) * 1993-10-01 2000-06-06 Daimlerchrysler Ag Method of using profiles, and producing metal sheets with stepped cross-sections and different wall thicknesses

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4487049A (en) * 1981-08-04 1984-12-11 Dnepropetrovsky Metallurgichesky Institut Working mandrel and method of rolling elongate hollow pieces in a multi-stand continuous mill on same working mandrel
JPS6054203A (ja) * 1983-09-06 1985-03-28 Nippon Steel Corp 押込み穿孔圧延のガイド装置
US4982487A (en) * 1988-10-27 1991-01-08 Hughes Aircraft Company Metallic component cold roll/crimping tool
US6070448A (en) * 1993-10-01 2000-06-06 Daimlerchrysler Ag Method of using profiles, and producing metal sheets with stepped cross-sections and different wall thicknesses
US5907969A (en) * 1997-03-19 1999-06-01 Soder; James T. Tool for working shaped, hollow metal tubing to achieve an end reduction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102229044A (zh) * 2011-05-06 2011-11-02 西安理工大学 一种宽幅镁合金超薄板材连续挤轧装置及挤轧方法

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KR100498089B1 (ko) 2005-07-01
KR20030038650A (ko) 2003-05-16

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