EP1390164B1 - Anordnung zur lösbaren verbindung einer pressscheibe mit einem pressstempel einer strangpresse - Google Patents

Anordnung zur lösbaren verbindung einer pressscheibe mit einem pressstempel einer strangpresse Download PDF

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Publication number
EP1390164B1
EP1390164B1 EP02717265A EP02717265A EP1390164B1 EP 1390164 B1 EP1390164 B1 EP 1390164B1 EP 02717265 A EP02717265 A EP 02717265A EP 02717265 A EP02717265 A EP 02717265A EP 1390164 B1 EP1390164 B1 EP 1390164B1
Authority
EP
European Patent Office
Prior art keywords
dummy block
stud
sleeve
locking pin
press
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP02717265A
Other languages
English (en)
French (fr)
Other versions
EP1390164A1 (de
Inventor
Morgan Oliver Lindholm
Lars Jonas Olsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Uddeholm Machining AB
Original Assignee
Uddeholm Machining AB
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.)
Filing date
Publication date
Application filed by Uddeholm Machining AB filed Critical Uddeholm Machining AB
Publication of EP1390164A1 publication Critical patent/EP1390164A1/de
Application granted granted Critical
Publication of EP1390164B1 publication Critical patent/EP1390164B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21C26/00—Rams or plungers; Discs therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/026—Mounting of dies, platens or press rams

Definitions

  • the present invention relates to an arrangement for releasably connecting a dummy block to a press stem of an extrusion press (see for example US-A-3 303 684).
  • extrusion presses are utilized for the production of profile members of metal, especially of aluminium or aluminium alloys.
  • a billet heated to a high temperature, is placed in front of the dummy block in a cylindrical press chamber, whereupon, by means of the dummy block and the press stem located behind said block, it is forced under high pressure against an extrusion die, provided with a through opening, having a shape corresponding to the desired profile of the profile member.
  • the dummy block As a consequence of the high temperature and the high pressure, during the operation of the press, the dummy block is subjected to a hard wear at its peripheral front portion. For this reason, the dummy block has to be replaced rather often, usually already after a usage time of only a few days. In order to facilitate the necessary replacement of the dummy block as soon as such a replacement is required, the dummy block has to be releasably connected to the press stem.
  • the invention has for its purpose to provide an arrangement of the kind initially specified which makes it possible to perform a replacement of the dummy block in a considerably more simple and rapid manner than previously possible.
  • the arrangement is primarily characterized in that it comprises a first connecting element, formed by an axially protruding rear portion of the dummy block, and a second connecting element, formed by an axially protruding front portion of a holder for the dummy block, mountable on or rigidly connected to the press stem, wherein one of said two connecting elements consists of an axially protruding stud, while the other connecting element consists of an axially protruding sleeve that can be slipped on to said stud, and wherein the arrangement also comprises a locking pin which, when said sleeve has been slipped on to said stud, can be inserted in transversally extending through bores in the two connecting elements in order to hold said elements releasably connected to each other.
  • the dummy block can be mounted on the press stem and removed therefrom in a very simple and rapid manner.
  • the only steps that need to be taken when the dummy block is to be mounted on the press stem consist in slipping the connecting element having the shape of a sleeve on to the connecting element having the shape of a stud and then inserting the locking pin through the transversally extending bores in the two connecting elements.
  • this can be effected simply by removing the locking pin by means of a suitable mandrel, whereupon the dummy block unobstructedly can be slipped off from the press stem.
  • the two connecting elements may have any suitable cross-sectional shapes adapted to each other.
  • said stud may preferably have an outer surface having a generally circular cross-section and said sleeve an inner surface having a generally circular cross-section.
  • the locking pin may suitably be arranged to be releasably held inserted in said bores in the two connecting elements by snap-in means acting between the locking pin and one connecting element.
  • the holder may preferably be arranged to transmit only axial pulling forces to the dummy block via the locking pin, while it is arranged to transmit axial pushing forces to the dummy block via special cooperating contact surfaces of the holder and the dummy block, serving for the transmission of such forces.
  • Said contact surfaces may suitably be formed by an annular end surface of said sleeve, provided at the free end of the sleeve, and a cooperating annular surface, extending in a generally radial outward direction from said stud at the inner end of the stud,
  • said two annular contact surfaces may consist of part-spherical surfaces having a large radius of curvature and said stud may be arranged to be received with a small radial play in said sleeve.
  • the dummy block may consist of a member formed in one single piece. However, in known manner, it may comprise a generally sleeve-shaped body and a block core, formed by a separate element and comprising a generally frusto-conical front portion, which is arranged to be received in a central conical opening in said body at the front end of the body, and a rear shank, serving to hold the block core to said body. Said shank may in known manner be secured to the body of the dummy block by means of a nut mounted on a rear threaded portion of said shank.
  • the invention makes it possible instead to obtain the required connection between the block core and the body of the dummy block by means of the locking pin utilized for connecting the two above-mentioned connecting elements releasably to each other.
  • the shank of the block core may comprise a portion insertable into an axial passage in the above-mentioned stud and provided with a transversally extending through bore, into which said locking pin can be inserted.
  • reference numeral 10 generally designates a dummy block of an extrusion press
  • reference numeral 11 generally designates a holder for the dummy block that may be rigidly or releasably connected to a press stem 12, which has been indicated in dash-dotted lines and by means of which the dummy block may be moved axially backwards and forwards within a press chamber 13, indicated in dash-dotted lines.
  • holder 11 has been assumed to be provided with a central threaded bore in which a central threaded stud of press stem 12 is received.
  • the press is intended to be used for the production of profile members of metal.
  • These members are formed from a billet, heated to a high temperature and placed in press chamber 13 in front of dummy block 10.
  • the billet is forced under high pressure against a press die (not shown) which is provided with a through opening having a shape corresponding to the desired profile of the profile members.
  • dummy block 10 consists of a generally sleeve-shaped body 14 and a separate block core 15, comprising a generally frusto-conical front portion 16 and a shank 17 extending in a rearward direction from said front portion.
  • block core 15 is held to body 14 in a position in which it has its portion 16 received in a central conical front opening 18 in body 14.
  • Portion 16 of block core 15 and opening 18 in body 14 may in practice have more complicated shapes than those for the sake of simplicity shown in the drawing.
  • body 14 is provided with a first connecting element, formed by a rear axially protruding tubular stud 20, while holder 11 is provided with a second connecting element, formed by an axially protruding front sleeve 21 which can be slipped on to stud 20.
  • Stud 20 and sleeve 21, which both may have a circular cross-section, are provided with transversally extending through bores 22 and 23, respectively.
  • bores 22 and 23 serve to make it possible, after an insertion of stud 20 into sleeve 21 or slipping said sleeve on to said stud, respectively, to provide a releasable connection between the two connecting elements by means of a locking pin 24, insertable into bores 22 and 23.
  • the connecting elements formed by stud 20 and sleeve 21, and the locking pin 24, cooperating with said elements, makes it possible, when required, to replace the dummy block in a very simple and rapid manner.
  • a resilient locking ring 25 which acts as a snap-in means and is placed in a groove 26 in the wall of one of the two bores 23, provided in socket 21, and which can be brought into engagement with a groove 27 in locking pin 24.
  • axial pulling forces can be transmitted from press stem 12 to dummy block 10 via locking pin 24.
  • Axial pushing forces on the other hand are not transmitted via the locking pin but instead via special cooperating contact surfaces of holder 11 and dummy block body 14, serving for the transmission of such forces.
  • These contact surfaces are formed by an annular end surface 28 of sleeve 21 at the free end of said sleeve and a cooperating annular surface 29 of the body of the dummy block, extending in an approximately radial outward direction from stud 20 at the inner end of said stud.
  • the locking pin is received with a small play in bores 22 in stud 20.
  • surfaces 28 and 29 may suitably consist of part-spherical surfaces having a comparatively large radius of curvature R, and stud 20 may be arranged to be received with a small radial play in sleeve 21.
  • the embodiment according to Figure 2 differs from the embodiment according to Figure 1 substantially only in respect of the shape of shank 17 of block core 15 and the manner for holding the block core to body 14 of dummy block 10.
  • block core 15 is secured to body 14 by means of a nut 19, in the embodiment according to Figure 2, it is instead secured to body 14 by means of locking pin 24.
  • shank 17 comprises a portion insertable in an axial passage 30 in stud 20 and provided with a transversally extending through bore 31, into which locking pin 24 can be inserted.
  • block core 15' and opening 18' in body 14' of dummy block 10' deviates from the shape of corresponding elements of the arrangement according to Figure 1 and that, instead of a central threaded bore, holder 11' has a threaded stud which extends from the rear side of the holder and by means of which the holder can be releasably connected to press stem 12'.
  • Stud 20' and sleeve 21' are provided with transversally extending through bores 22' and 23', respectively, which permit the two connecting elements to be releasably held connected to each other by means of a locking pin 24' inserted into bores 22' and 23'.
  • the contact surfaces serving to transmit pushing forces from holder 11' to dummy block 10' are formed by an annular end surface 28' of sleeve 21' and a cooperating annular surface 29' of holder 11'. Both surfaces 28' and 29' consist of part-spherical surfaces having a relatively large radius of curvature R'.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Insertion Pins And Rivets (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Extrusion Of Metal (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Automatic Assembly (AREA)

Claims (7)

  1. Anordnung zum lösbaren Verbinden einer Pressscheibe (10; 10') mit einem Pressstempel (12; 12') einer Strangpresse, dadurch gekennzeichnet, dass sie umfasst:ein erstes Verbindungselement (20; 21'), durch einen axial vorstehenden Hinterabschnitt der Pressscheibe (10; 10') gebildet, und ein zweites Verbindungselement (21; 20'), durch einen axial vorstehenden Vorderabschnitt einer Haltevorrichtung (11) für die Pressscheibe (10; 10') gebildet, auf dem Pressstempel (12; 12') montierbar oder mit ihm starr verbunden, worin einer der zwei Verbindungselemente aus einem axial vorstehenden Bolzen (20; 20') besteht, während das andere Verbindungselement aus einer axial vorstehenden Hülse (21; 21') besteht, die auf den Bolzen (20; 20') aufgesteckt werden kann, und worin die Anordnung auch einen Sperrbolzen (24; 24') umfasst, der, wenn die Hülse (21; 21') auf dem Bolzen (20; 20') aufgesteckt ist, in querlaufende durchgehende Bohrungen (22, 23; 22', 23') in den zwei Verbindungselementen (20, 21; 20', 21') eingesetzt werden kann, um die zwei Elemente (20, 21; 20', 21') lösbar miteinander zu verbinden.
  2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass der Bolzen (20; 20') eine äussere Oberfläche aufweist, die einen generell kreisförmigen Querschnitt hat, und jene Hülse (21; 21') eine innere Oberfläche aufweist, die einen generell kreisförmigen Querschnitt hat.
  3. Anordnung nach Anspruch 1 öder 2, dadurch gekennzeichnet, dass der Sperrbolzen (24; 24') angeordnet ist, um lösbar in den Bohrungen (22, 23; 22' 23') in den zwei Verbindungselementen (20, 21; 20', 21') eingesetzt durch eine Schnappvorrichtung (25; 25') gehalten zu werden, die zwischen dem Sperrbolzen (24; 24') und einem Verbindungselement (21; 21') wirkt.
  4. Anordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Haltevorrichtung (11; 11') eingerichtet ist, um nur axiale Ziehkräfte zu der Pressscheibe (10; 10') über den Sperrbolzen (24; 24') zu übertragen, während sie eingerichtet ist, die axialen Stosskräfte zu der Pressscheibe (10; 10') über spezielle zusammenwirkende der Übertragung solcher Kräfte dienende Kontaktoberflächen (28, 29; 29', 28') der Haltevorrichtung (11; 11') und der Pressscheibe (10; 10') zu übertragen.
  5. Anordnung nach Anspruch 4, dadurch gekennzeichnet, dass die Kontaktoberflächen durch eine ringförmige Endoberfläche (28; 28') der Hülse (21; 21'), die an dem freien Ende der Hülse vorgesehen ist, und durch eine zusammenwirkende ringförmige Oberfläche (29; 29'), die sich in einer annähernd radialen Aussenrichtung vom Bolzen (20; 20') am inneren Ende des Bolzens erstreckt, ausgebildet sind.
  6. Anordnung nach Ansprüch 5, dadurch gekennzeichnet, dass die zwei ringförmigen Oberflächen aus teilkugeligen Oberflächen (28, 29; 28', 29') bestehen, die einen grossen Krümmungsradius aufweisen, und jener Bolzen (20; 20') angeordnet ist, um mit einem kleinen radialen Spiel in der Hülse (21; 21') aufgenommen zu sein.
  7. Anordnung nach einem der vorhergehenden Ansprüche, worin die Pressscheibe (10) aus einem generell hülsenförmigen Körper (14) und einem Blockkern (15) besteht, der durch ein getrenntes Element gebildet ist und einen generell kegelförmigen Vorderabschnitt (16) umfasst, der angeordnet ist, in einer zentralen konischen Öffnung (18) in dem Körper (14) am vorderen Ende des Körpers aufgenommen zu werden, und ein hinterer Schaft (17), der dazu dient, den Blockkern (15) an dem Körper (14) zu halten, dadurch gekennzeichnet, dass der Schaft (17) des Blockkerns (15) einen Abschnitt umfasst, der in einer axialen Passage (30) in dem Bolzen einsetzbar und mit sich quer erstreckenden durchgehenden Bohrungen (31), in die der Sperrbolzen (24) eingesetzt werden kann, vorgesehen ist.
EP02717265A 2001-04-04 2002-04-03 Anordnung zur lösbaren verbindung einer pressscheibe mit einem pressstempel einer strangpresse Expired - Lifetime EP1390164B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0101195A SE521971C2 (sv) 2001-04-04 2001-04-04 Anordning för lösbar sammankoppling av ett presshuvud med en presstämpel hos en strängpressningsmaskin
SE0101195 2001-04-04
PCT/SE2002/000650 WO2002081110A1 (en) 2001-04-04 2002-04-03 Arrangement for releasably connecting a dummy block to a press stem of an extrusion press

Publications (2)

Publication Number Publication Date
EP1390164A1 EP1390164A1 (de) 2004-02-25
EP1390164B1 true EP1390164B1 (de) 2006-11-22

Family

ID=20283662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02717265A Expired - Lifetime EP1390164B1 (de) 2001-04-04 2002-04-03 Anordnung zur lösbaren verbindung einer pressscheibe mit einem pressstempel einer strangpresse

Country Status (6)

Country Link
EP (1) EP1390164B1 (de)
AT (1) ATE345883T1 (de)
DE (1) DE60216272T2 (de)
ES (1) ES2276925T3 (de)
SE (1) SE521971C2 (de)
WO (1) WO2002081110A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016059676A1 (ja) * 2014-10-14 2016-04-21 日本軽金属株式会社 押出ステム

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303684A (en) * 1963-12-09 1967-02-14 Michael Flynn Mfg Company Fixed dummy block for extrusion press
US3369384A (en) * 1965-07-07 1968-02-20 Reynolds Metals Co Metal extrusion
FR2221271B1 (de) * 1973-01-04 1976-05-14 Beauplat Philippe
DE2940635C2 (de) * 1979-10-06 1985-06-20 Fa. Muhr und Bender, 5952 Attendorn Profilstahlschere, -stanze o.dgl.
US5687604A (en) * 1996-05-30 1997-11-18 Exco Technologies Ltd. Thermal controlled mandrel with replaceable tip for copper and brass extrusion
DE19941218C1 (de) * 1999-08-30 2000-12-07 Roger Mokrski Spannvorrichtung für Press- oder Stanzmaschinen

Also Published As

Publication number Publication date
ES2276925T3 (es) 2007-07-01
SE0101195D0 (sv) 2001-04-04
DE60216272D1 (de) 2007-01-04
ATE345883T1 (de) 2006-12-15
EP1390164A1 (de) 2004-02-25
SE0101195L (sv) 2002-10-05
DE60216272T2 (de) 2007-06-28
SE521971C2 (sv) 2003-12-23
WO2002081110A1 (en) 2002-10-17

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