SI9300258A - Process for radial extrusion with tube wall reduction - Google Patents

Process for radial extrusion with tube wall reduction Download PDF

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Publication number
SI9300258A
SI9300258A SI9300258A SI9300258A SI9300258A SI 9300258 A SI9300258 A SI 9300258A SI 9300258 A SI9300258 A SI 9300258A SI 9300258 A SI9300258 A SI 9300258A SI 9300258 A SI9300258 A SI 9300258A
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Slovenia
Prior art keywords
tube
mandrel
punch
counter
wall
Prior art date
Application number
SI9300258A
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Slovenian (sl)
Inventor
Janez Pipan
Original Assignee
Janez Pipan
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Janez Pipan filed Critical Janez Pipan
Priority to SI9300258A priority Critical patent/SI9300258A/en
Priority to DE19934342562 priority patent/DE4342562A1/en
Priority to ES94916475T priority patent/ES2100068T3/en
Priority to PCT/SI1994/000007 priority patent/WO1994026437A2/en
Priority to EP94916475A priority patent/EP0700323B1/en
Priority to DE69401752T priority patent/DE69401752T2/en
Priority to RU95122237A priority patent/RU2116861C1/en
Priority to DK94916475T priority patent/DK0700323T3/en
Priority to JP6525346A priority patent/JPH08510960A/en
Publication of SI9300258A publication Critical patent/SI9300258A/en
Priority to US08/937,265 priority patent/US5765425A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/20—Making uncoated products by backward extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/08—Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/16—Remodelling hollow bodies with respect to the shape of the cross-section

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Extrusion Of Metal (AREA)

Abstract

A subject of the invention is the radial extrusion process combined with inside tube ironing, which is an essence a cold extrusion process and can be reckoned among bulk metal forming processes. It enables tube shaped metal semiproducts to be formed into different final shaped parts or parts that are intended for additional working, for example by machining. The process is grounded on insertion of a tube (1), which may be on one end previously expanded, into a proper shaped die (3), where on one side there is a punch (4) which is retained with a determined force (F1) and inside which lies a free movable mandrel (5), while from the other side in working stroke the counter-punch (2) extrudes the difference of tube volume which results from ironing of the tube (1), in the direction of counter-punch (2) travel so, that the material fills up the starting clearance between the mandrel (5) and the tube (1), the space between the tube (1) and the punch (2) and arbitrary shaped space (B) in the punch (2) or in the die (3).

Description

POSTOPEK RADIALNEGA IZTISKOVANJARADIAL PRESSURE PROCEDURE

Z REDUKCIJO STENE CEVIBY REDUCING THE PIPE WALL

Predmet izuma je postopek radialnega iztiskovanja z redukcijo stene cevi, ki je v bistvu hladno iztiskovanje in ga prištevamo k postopkom masivnega preoblikovanja in ki omogoča preoblikovanje kovinskih polizdelkov v obliki cevi v različne oblike, ki so lahko dokončne ali pa namenjene nadaljni obdelavi npr. s postopki odrezavanja.The subject of the invention is a radial extrusion process with pipe wall reduction, which is essentially cold extrusion, which is referred to as a mass transformation process, which allows the transformation of metal semi-finished tube-shaped products into various shapes, which may be final or intended for further processing, e.g. with cutting procedures.

Izum spada v razred B 21D 22/00 mednarodne patentne klasifikacije.The invention belongs to Class B 21D 22/00 of the International Patent Classification.

- 2 Tehnični problem, ki ga predloženi izum uspešno rešuje, je določitev in izvedba takšnega postopka, ki bo omogočal preoblikovanje enostavnih surovcev odrezanih od standardnih tanko ali srednjedebelostenskih cevi ali pa takšnih, ki so na enem koncu predhodno razširjeni, v preoblikovance zahtevnejših osnosimetričnih oblik, za katere je značilno daljše cilindrično steblo, ki preide v obliko, katera lahko zajema skokovito povečanje premera ter nagle spremembe debeline stene in oblike njenega preseka.- 2 A technical problem that is successfully solved by the present invention is the determination and implementation of such a process that will allow the transformation of simple workpieces cut from standard thin or medium-thick tubes, or at one end previously expanded into transformations of more complex axisymmetric shapes, characterized by a longer cylindrical stem that converts to a shape that can capture a sharp increase in diameter and sudden changes in the thickness of the wall and the shape of its cross-section.

Karakteristične oblike delov, ki jih je mogoče izdelati s postopkom po izumu, so prikazane na sliki 2, na kateri predstavljajo oblike na levi strani simetral izhodiščna, na desni pa končna stanja po preoblikovanju.The characteristic shapes of the parts that can be made by the process according to the invention are shown in Figure 2, in which the shapes on the left represent the initial symmetry and on the right the final states after transformation.

Izdelava podolgovatih tankostenskih rotacijsko simetričnih oblik s hladnim preoblikovanjem surovcev iz cevi je zaželjena zlasti v primerih močno obremenjenih delov. Na ta način dosežemo po eni strani boljše trdnostne lastnosti, ki izhajajo iz plastične utrditve materiala in vlaknaste strukture, po drugi strani pa je pri izdelavi takih oblik iz cevi glede na geometrijsko podobnost izhodiščne in končne oblike potrebna plastična deformacija sorazmerno majhna, s čimer je odpravljena potreba po preoblikovanju v večih stopnjah zaradi vmesnega rekristalizacijskega žarjenja, ohranjena pa je tudi zadostna žilavost materiala.The production of elongated thin-walled rotationally symmetrical shapes by cold forming the tubular billets is desirable especially in the case of heavily loaded parts. In this way, on the one hand, better strength properties resulting from the plastic hardening of the material and the fibrous structure are achieved, and on the other hand, the plastic deformation is relatively small in order to produce such shapes from the pipes with respect to the geometric similarity of the initial and final shape, which eliminates the need for multi-stage transformation due to intermediate recrystallization annealing while maintaining sufficient material toughness.

V primeru kosovne proizvodnje preoblikujemo polizdelke v obliki cevi večinoma s postopki, pri katerih spremembe debeline stene niso cilj ampak posledica spremembe premera in dolžine. Taki postopki so krivljenje, širjenje, zoževanje, hidrostatično ekspandiranje in potisno oblikovanje.In the case of bulky production, we transform tube-shaped semi-finished products mainly by processes where changes in wall thickness are not the goal but a consequence of changes in diameter and length. Such processes are bending, spreading, narrowing, hydrostatic expansion and thrust molding.

Do namerne spremembe debeline stene pride na primer pri postopkih kot so reduciranje, istosmerno iztiskovanje, radialno iztiskovanje, potisno valjanje, rotacijsko kovanje in rotacijsko nakrčevanje koncev cevi. Poseben problem predstavlja tako preoblikovanje cevi, pri katerem se zahteva lokalno rotacijsko simetrično povečanje debeline stene cevi ali pa skokovite spremembe oblike preseka stene.For example, a deliberate change in wall thickness occurs in processes such as reduction, direct extrusion, radial extrusion, thrusting, rotary forging, and rotary shrinkage of pipe ends. A particular problem is the transformation of the pipe, which requires a local rotational symmetric increase in the thickness of the pipe wall or a sudden change in the shape of the cross-section of the wall.

- 3 Lokalno rotacijsko simetrično povečanje debeline stene je mogoče doseči samo z nakrčevanjem cevi v aksialni smeri, pri čemer pa pride v primeru nepodprte cevi do pojava rotacijsko simetričnih gub, kar običajno preprečimo tako, da steno z notranje in zunanje strani podpremo s trnom oz. matrico. Zaradi velike torne površine se v tem primeru močno odraža vpliv trenja, ki je tem večji, čim manjša je debelina stene v primerjavi s premerom in čim večja je podprta dolžina cevi, prek katere se prenaša aktivna sila nakrčevanja. Problem trenja je še posebno velik v primeru postopka radialnega iztiskovanja cevi, pri katerem so za doseganje željenega plastičnega tečenja materiala v območju preoblikovalne cone potrebne tlačne napetosti, ki so lahko tudi nekajkrat večje od napetosti tečenja. Poznani postopek radialnega iztiskovanja cevi, pri katerem se delovni gib orodja prenaša prek koncev cevi, je zato uporaben le za preoblikovanje krajših cevi oz. cevi z večjimi debelinami stene.- 3 Rotationally symmetric increase of wall thickness can only be achieved by bending the pipe in the axial direction, which in the case of unsupported pipe causes rotation symmetrical folds, which is usually prevented by supporting the wall from the inside and the outside with a mandrel or. matrix. Due to the large friction surface, the influence of friction is greater in this case, the greater the friction, the smaller the wall thickness compared to the diameter and the greater the supported length of the pipe through which the active force of shrinkage is transmitted. The problem of friction is particularly large in the case of a radial extrusion of pipes, in which to achieve the desired plastic flow of material in the area of the transformation zone, compressive stresses may be required, which may also be several times greater than the flow stresses. The known radial extrusion process, in which the working stroke of the tool is transmitted through the ends of the pipes, is therefore only useful for the transformation of shorter pipes or. pipes with larger wall thicknesses.

Postopek radialnega iztiskovanja z redukcijo stene cevi po izumu temelji na vstavitvi cevi, ki je lahko na enem koncu predhodno razširjena v ustrezno oblikovano matrico, pri čemer je z ene strani z določeno silo pridrževan pestič, v katerem leži prosto pomičen trn, medtem ko z druge strani v delovnem gibu protipestič, katerega premer je večji od notranjega premera cevi, ob reduciranju stene cevi iztisne razliko volumna cevi v smeri pestiča tako, da material zapolni začetno rego med trnom in cevjo, oziroma prazen prostor v matrici oz. pestiču.The method of radial extrusion by reducing the wall of the tube according to the invention is based on the insertion of a tube which may be pre-extended into one appropriately shaped die at one end, with a force held on one side by a pin in which a freely moving mandrel lies while on the other In the working movement of the pipe, a counterbore whose diameter is larger than the inner diameter of the pipe, while reducing the pipe wall, squeezes the difference of the tube volume in the direction of the pistil by filling the initial gap between the mandrel and the tube, or the empty space in the die or tube. pesticu.

Izum bom podrobneje opisal na osnovi izvedbenega primera in slik, od katerih kaže:I will describe the invention in greater detail on the basis of an embodiment and illustrations, of which:

slika 1 na konkretnem izvedbenem primeru prikazan postopek radialnega iztiskovanja z redukcijo stene cevi po izumu v začetni in končni fazi slika 2 tipične oblike izdelkov dosegljive s postopkom radialnega iztiskovanja z redukcijo stene cevi po izumuFIG. 1 shows, in a specific embodiment, a radial extrusion process with reduction of the pipe wall according to the invention in the initial and final stages. FIG.

- 4 Na sliki 1 je prikazan na konkretnem izvedbenem primeru postopek radialnega iztiskovanja z redukcijo stene cevi po izumu v začetni in končni fazi. Omenjeni postopek po izumu je možno izvajati na vertikalnih ali horizontalnih hidravličnih ali mehanskih stiskalnicah z najmanj dvema, prednostno pa s tremi neodvisnimi pogoni.- 4 In Fig. 1, a radial extrusion process with reduction of the pipe wall according to the invention in the initial and final stages is shown in a specific embodiment. Said method according to the invention can be performed on vertical or horizontal hydraulic or mechanical presses with at least two, preferably three independent actuators.

Cev 1, katere zgornji del je lahko predhodno razširjen, vstavimo v matrico 3, ki je pritrjena na mizo stroja. Nato primaknemo pestič 4, ki mora biti ves čas pridrževan z določeno silo Fp kar zagotavlja vzdrževanje potrebnega hidrostatičnega tlaka v deformacijski coni A, v kateri poteka proces radialnega iztiskovanja. V pestiču 4 leži prosto pomičen trn 5, katerega premer je zaradi lažjega vstopa nekoliko manjši od začetnega notranjega premera cevi 1. Namesto prosto pomičnega trna 5 je možno uporabiti tudi izvedbo protipestiča, ki ima na zgornjem delu podaljšek, katerega premer ustreza premeru pomičnega trna 5. Delovni gib opravimo s protipestičem 2, katerega razširjeni del je debelejši od začetnega notranjega premera cevi 1. Med delovnim gibom se zato razlika volumna cevi iztiska v smeri pestiča 4, pri čemer se najprej zapolni začetna rega med trnom 5 in cevjo 1, nato pa ob naglem porastu hidrostatičnega tlaka na vrednost, ki je pogojena s silo Fp s katero je pridrževan pestič 4, še v pestiču 4 izveden prazen prostor B, katerega oblika kasneje pogojuje končno obliko nastavka. Glede na končno obliko, ki jo želimo doseči, je lahko prazen prostor B izveden tudi v matrici 3. Natančno končno obliko izdelka, ki je definirana z obliko matrice 3, pestiča 4, protipestiča 2, trna 5 in dolžine delovnega giba protipestiča 2, dobimo pri dovolj velikem hidrostatičnem tlaku, ki je sicer omejen s silo Fv Pri oblikovanju zoba v prostoru B, kakršen je prikazan na sliki 1 bistveno pripomore tudi trenje med preoblikovancem (cevjo 1) in trnom 5. Zaradi hidrostatičnega tlaka v deformacijski coni A bi lahko prišlo tudi do tečenja materiala v nasprotni smeri od gibanja pestiča (na sliki 1 v smeri navzdol). To preprečimo s pravilnim oblikovanjem zadebeljenega dela protipestičaPipe 1, the upper part of which can be previously expanded, is inserted into the die 3, which is attached to the machine table. Then we move the piston 4, which must be held at all times by a certain force Fp, which ensures that the required hydrostatic pressure is maintained in the deformation zone A, in which the process of radial extrusion takes place. In the piston 4 there is a freely movable mandrel 5 whose diameter is slightly smaller than the initial internal diameter of the tube 1 for ease of entry. Instead of a freely movable mandrel 5, it is also possible to use a counter-mandrel which has an extension at the top of which the diameter corresponds to the diameter of the mandrel 5 The working stroke is made with a counter-pin 2 whose extended part is thicker than the initial inner diameter of pipe 1. During the working stroke, therefore, the difference of the tube volume is extruded in the direction of the pin 4, first filling the initial gap between the pin 5 and tube 1, and then with a sudden increase in hydrostatic pressure to a value conditioned by the force Fp with which the piston 4 is held, a vacant space B is made in the piston 4, whose shape later determines the final shape of the attachment. Depending on the final shape we want to achieve, the empty space B can also be made in matrix 3. The exact final shape of the product, which is defined by the shape of the matrix 3, the pin 4, the counter 2, the mandrel 5 and the length of the working movement of the counter 2, is obtained at a sufficiently high hydrostatic pressure, which is otherwise limited by the force F v. When forming a tooth in space B, as shown in Figure 1, the friction between the mold (tube 1) and the mandrel 5 is also significantly assisted. Due to the hydrostatic pressure in deformation zone A, there was also a flow of material in the opposite direction to the movement of the pistil (in Fig. 1 in the downward direction). This is prevented by the proper design of the thickened part of the counterpart

- 5 2, še posebej dolžine zadebelitve Lp, od katere zavisi trenje, ki deluje v smeri gibanja protipestiča 2. Nezaželjeno protismerno tečenje materiala deloma preprečuje tudi togo podprta puša za izmetavanje 6, prek katere pa se sme prenašati le tolikšna sila, ki še ne povzroča aksialnega nakrčenja cevi pod zadebeljenim delom protipestiča 2.- 5 2, especially the length of the thickening Lp, on which the friction acting in the direction of the movement of the counterpart 2. Depends on the unwanted counter-flow of the material, partly prevented by the rigidly supported ejector sleeve 6, through which only enough force can be transmitted. causes axial contraction of the tube under the thickened part of the counterpane 2.

Posebna prednost postopka po izumu je v tem, da je mogoče vpliv trenja na preoblikovalno silo F2 obvladovati tudi pri večjih dolžinah cilindričnih odcepov in sicer z ustreznim dimenzioniranjem premera trna 5 in premera zadebeljenega dela protipestiča 2. Na ta način je mogoče doseči, da pride do zapolnitve reže med cevjo 1 in trnom 5, čemur sledi porast hidrostatičnega tlaka v coni A in s tem tudi sile trenja, ki deluje na protipestič, šele v zadnjem delu giba protipestiča.A particular advantage of the process according to the invention is that the influence of friction on the forming force F2 can be controlled even at larger lengths of cylindrical branches, by properly dimensioning the diameter of the mandrel 5 and the diameter of the thickened part of the counterpart 2. In this way, it can be achieved filling the gap between tube 1 and mandrel 5, followed by an increase in the hydrostatic pressure in zone A and thus the friction force acting on the counterpart only at the back of the counter movement.

Na sliki 2 so prikazane tri tipične oblike izdelkov kakršne je mogoče izdelovati s postopkom radialnega iztiskovanja z redukcijo stene cevi po izumu, pri čemer predstavljajo preseki na levi strani simetral oblike surovcev, na desni pa končne oblike vzdolžnih prerezov. V primeru izdelkov na slikah 2a in 2b, ki lahko predstavljata del visokotlačne armature, je predvideno predhodno preoblikovanje ravne cevi s postopkom širjenja oz. zoževanja z začetnega premera cevi na premer D4 oz. D^. Obliko izdelka na sliki 2c, ki lahko predstavlja del sklopke pa je mogoče izdelati iz ravne cevi zunanjega premera Dt in notranjega premera Dq. Značilno za postopek radialnega iztiskovanja po izumu je, da ostane dolžina preoblikovanca približno enaka, pač pa se začetni notranji premer cevi Do v predelu stebla poveča na premer zadebeljenega dela protipestiča Dj. v prehodu v cono radialnega iztiskovanja pa se notranji premer zmanjša na premer trna D3.Figure 2 shows three typical shapes of products that can be produced by radial extrusion by reducing the pipe wall according to the invention, with the cross sections on the left being the symmetrical shapes of the workpieces and on the right the final shapes of the longitudinal sections. In the case of the products of Figures 2a and 2b, which may form part of a high-pressure armature, a preliminary transformation of the straight tube by the expansion or expansion process is envisaged. narrowing from the initial pipe diameter to the diameter D 4 oz. D ^. The shape of the product in Figure 2c, which may be part of the coupling, can be made from a straight tube of outer diameter Dt and inner diameter Dq. Typical of the radial extrusion process of the invention is that the length of the blade remains approximately the same, but the initial inner diameter of the tube D o in the stem region increases to the diameter of the thickened portion of the counterpart Dj. however, in the transition to the radial extrusion zone, the inside diameter is reduced to the diameter of the mandrel D 3 .

Claims (3)

PATENTNI ZAHTEVKIPATENT APPLICATIONS 1. Postopek radialnega iztiskovanja z redukcijo stene cevi, označen s tem, da je cev (1) s predhodno razširjenim zgornjim delom vstavljena v ustrezno oblikovano matrico (2), pri čemer je z ene strani z določeno silo pridrževan pestič (3) v katerem leži prosto pomičen trn (4), medtem ko z druge strani v delovnem gibu protipestič (5) iztisne razliko volumna cevi (1), ki izhaja iz redukcije stene cevi, v smeri gibanja protipestiča (2) tako, da material zapolni izoblikovano začetno rego med trnom (5) in cevjo (1), rego med cevjo in pestičem (4) ter poljubno izoblikovan prazen prostor (B).A method of radially extruding by reducing the wall of a tube, characterized in that the tube (1) with the previously expanded upper portion is inserted into a suitably shaped die (2), with a pin (3) being held on one side by a certain force. a freely movable mandrel (4) lies, while on the other hand, in the working motion, the counter (5) extends the difference of the volume of the tube (1) resulting from the reduction of the tube wall in the direction of movement of the counter (2) so that the material fills the formed initial slot between the mandrel (5) and the hose (1), the line between the hose and the hub (4), and any free space (B) formed. 2. Postopek radialnega iztiskovanja z redukcijo stene cevi, po zahtevku 1, označen s tem, da je premer vstavljene cevi (1) po celi dolžini enak.2. The radial extrusion method by reducing the wall of a pipe according to claim 1, characterized in that the diameter of the inserted tube (1) is the same lengthwise. 3. Postopek radialnega iztiskovanja z redukcijo stene cevi, po zahtevku 1, označen s tem.3. Radial extrusion method by reducing the wall of a tube according to claim 1, characterized in. da je namesto prosto pomičnega trna (5) na zgornjem delu protipestiča (2) izveden podaljšek, katerega premer ustreza premeru trna (5).that an extension whose diameter corresponds to the diameter of the mandrel (5) is made in place of the freely movable mandrel (5) on the upper part of the counter-tip (2). mag. Janez Pipan, dipl. ing.Mag. Janez Pipan, B.Sc. ing. Slika 1Figure 1 Slika 2a Slika 2b Slika 2c mag. Janez Pipan, dipl. ing.Figure 2a Figure 2b Figure 2c Mag. Janez Pipan, B.Sc. ing.
SI9300258A 1993-05-17 1993-05-17 Process for radial extrusion with tube wall reduction SI9300258A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
SI9300258A SI9300258A (en) 1993-05-17 1993-05-17 Process for radial extrusion with tube wall reduction
DE19934342562 DE4342562A1 (en) 1993-05-17 1993-12-14 Process for cross extrusion of hollow bodies by reducing the tube wall
ES94916475T ES2100068T3 (en) 1993-05-17 1994-05-16 RADIAL EXTRUSION PROCESS COMBINED WITH INTERNAL TUBE IRONING.
PCT/SI1994/000007 WO1994026437A2 (en) 1993-05-17 1994-05-16 Radial extrusion process combined with inside tube ironing
EP94916475A EP0700323B1 (en) 1993-05-17 1994-05-16 Radial extrusion process combined with inside tube ironing
DE69401752T DE69401752T2 (en) 1993-05-17 1994-05-16 RADIAL EXTRUSION METHOD COMBINED WITH INNER PULLING THE TUBE
RU95122237A RU2116861C1 (en) 1993-05-17 1994-05-16 Method of radial extrusion in combination with internal drawing and thinning of pipe
DK94916475T DK0700323T3 (en) 1993-05-17 1994-05-16 Method of Radial Float Compression in Combination with Internal Wall Thickness Reducing Depth of a Pipe
JP6525346A JPH08510960A (en) 1993-05-17 1994-05-16 Radial extrusion method with in-tube ionization
US08/937,265 US5765425A (en) 1993-05-17 1997-09-15 Radial extrusion process combined with inside tune ironing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SI9300258A SI9300258A (en) 1993-05-17 1993-05-17 Process for radial extrusion with tube wall reduction

Publications (1)

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SI9300258A true SI9300258A (en) 1995-02-28

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EP (1) EP0700323B1 (en)
JP (1) JPH08510960A (en)
DE (2) DE4342562A1 (en)
DK (1) DK0700323T3 (en)
ES (1) ES2100068T3 (en)
RU (1) RU2116861C1 (en)
SI (1) SI9300258A (en)
WO (1) WO1994026437A2 (en)

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US6206392B1 (en) 1998-05-26 2001-03-27 Visteon Global Technologies, Inc. Stabilizer bar apparatus for use in a vehicle suspension
CN102941449B (en) * 2012-11-28 2015-02-18 隆昌山川精密焊管有限责任公司 Forming process of thick-wall thin-bottom metal part

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* Cited by examiner, † Cited by third party
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DE959876C (en) * 1952-10-01 1957-03-14 Bosch Gmbh Robert Process and blank for the non-cutting manufacture of hollow parts made of metal with a stepped sleeve shaft and profiled collar, such as spark plug housings
FR1112344A (en) * 1953-11-12 1956-03-13 Kabel U Metallwerke Neumeyer A Method and device for press-stamping, in particular cold, flanged-shaped parts made of metal, preferably steel
FR1423292A (en) * 1965-01-30 1966-01-03 Process for manufacturing tubular elements of metal or other materials, device for carrying out this process or similar process, and the tubular elements conforming to those obtained

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DE69401752T2 (en) 1997-06-05
WO1994026437A3 (en) 1995-01-19
WO1994026437A2 (en) 1994-11-24
DE4342562A1 (en) 1994-11-24
DE69401752D1 (en) 1997-03-27
EP0700323B1 (en) 1997-02-12
DK0700323T3 (en) 1997-07-28
ES2100068T3 (en) 1997-06-01
EP0700323A1 (en) 1996-03-13
JPH08510960A (en) 1996-11-19
RU2116861C1 (en) 1998-08-10

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