EP2379245B1 - Expansion dummy block for extruding press for hollow bodies - Google Patents

Expansion dummy block for extruding press for hollow bodies Download PDF

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Publication number
EP2379245B1
EP2379245B1 EP09803768.2A EP09803768A EP2379245B1 EP 2379245 B1 EP2379245 B1 EP 2379245B1 EP 09803768 A EP09803768 A EP 09803768A EP 2379245 B1 EP2379245 B1 EP 2379245B1
Authority
EP
European Patent Office
Prior art keywords
dummy block
hollow
expansion
internal
expansion dummy
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.)
Active
Application number
EP09803768.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2379245A1 (en
Inventor
Maurizio Cosolo
Angelo D'alessandro
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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 Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Publication of EP2379245A1 publication Critical patent/EP2379245A1/en
Application granted granted Critical
Publication of EP2379245B1 publication Critical patent/EP2379245B1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C26/00Rams or plungers; Discs therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/02Making uncoated products
    • B21C23/04Making uncoated products by direct extrusion
    • B21C23/08Making wire, bars, tubes
    • B21C23/085Making tubes

Definitions

  • a second type of press ( figures 2.1 and 2.2 ) is provided with an element named mandrel 21.
  • the container 22 of billet 23 As well as a die 24 provided with a bottleneck, through which the material of the billet flows thus forming the external diameter of the tube.
  • the mandrel 21 drives a hole into the billet, which is thus perforated, and at the end of the drilling operation it appears with the head inside the die ( fig. 2.2 ).
  • the material of the billet is forced to pass through the circular crown delimited by die and mandrel, thus producing a tube which in this case is homogeneous because the dividing wings are no longer present, and therefore of higher quality.
  • the machine is more complex because it has the additional part of the mandrel and the controlling device associated therewith.
  • the expansion dummy block has a hollow shape so as to allow a mandrel to slide therein, and comprises the following elements, the peculiarities of which are also highlighted in the following figures, in addition to fig. 3 .
  • This contrivance allows to avoid the use of the "dummy block recirculation" system and thus to save cycle time, reduce the need for maintenance, cut both machine costs and required energy - the extrusion is thus performed with fixed dummy block which does not need to be recirculated.
  • the ring may be made of H13 tempered steel, which ensures a given degree of elasticity, and a high resistance to wear.
  • the material is tool steel chosen from those available on the market.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Extrusion Of Metal (AREA)
  • Manufacturing Of Electric Cables (AREA)
EP09803768.2A 2008-12-24 2009-12-23 Expansion dummy block for extruding press for hollow bodies Active EP2379245B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT002325A ITMI20082325A1 (it) 2008-12-24 2008-12-24 Tacco ad espansione per pressa per estrusione di corpi cavi
PCT/EP2009/067889 WO2010072824A1 (en) 2008-12-24 2009-12-23 Expansion dummy block for extruding press for hollow bodies

Publications (2)

Publication Number Publication Date
EP2379245A1 EP2379245A1 (en) 2011-10-26
EP2379245B1 true EP2379245B1 (en) 2015-07-08

Family

ID=41279366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09803768.2A Active EP2379245B1 (en) 2008-12-24 2009-12-23 Expansion dummy block for extruding press for hollow bodies

Country Status (3)

Country Link
EP (1) EP2379245B1 (it)
IT (1) ITMI20082325A1 (it)
WO (1) WO2010072824A1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106903178A (zh) * 2017-02-17 2017-06-30 清华大学 一种具有组合式挤压轴的挤压机

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102962285A (zh) * 2012-11-02 2013-03-13 无锡鸿声铝业有限公司 挤压垫装置
JP6253488B2 (ja) * 2013-11-07 2017-12-27 新日鐵住金株式会社 前方押出加工方法、中空部材の製造方法及び前方押出加工装置
RU2016143752A (ru) * 2014-05-22 2018-06-25 Экско Текнолоджиз Лимитед Пресс-шайба для экструзионного пресса
CN116475258B (zh) * 2023-06-15 2023-09-01 陕西长羽航空装备股份有限公司 一种航空飞机用大型钛合金深筒体反挤压锻造设备及方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE940104C (de) * 1948-10-02 1956-03-08 Felten & Guilleaume Carlswerk Strangpressverfahren und Hohlstempel zum Verpressen von hintereinander folgenden Bloecken aus Metall
US3296848A (en) * 1963-10-21 1967-01-10 Reynolds Metals Co Method and apparatus for extruding tubular members from solid billets or the like
BE739273A (it) * 1968-10-16 1970-03-02
SU852400A1 (ru) * 1979-07-24 1981-08-07 Каменск-Уральский Ордена Трудовогокрасного Знамени Металлургическийзавод Пресс-шайба дл прессовани МЕТАлличЕСКОй зАгОТОВКи
JPS56175108U (it) * 1980-05-29 1981-12-24
JPH0576927A (ja) * 1991-04-23 1993-03-30 Showa Alum Corp マンドレル押出機用アタツチドダミー装置
US5918498A (en) * 1996-07-18 1999-07-06 Robbins; Paul H. Dummy block construction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106903178A (zh) * 2017-02-17 2017-06-30 清华大学 一种具有组合式挤压轴的挤压机

Also Published As

Publication number Publication date
ITMI20082325A1 (it) 2010-06-25
WO2010072824A1 (en) 2010-07-01
EP2379245A1 (en) 2011-10-26

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