EP0889763B1 - Variable-thickness extrusion method and extrusion unit in accordance with said method - Google Patents

Variable-thickness extrusion method and extrusion unit in accordance with said method Download PDF

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Publication number
EP0889763B1
EP0889763B1 EP97915464A EP97915464A EP0889763B1 EP 0889763 B1 EP0889763 B1 EP 0889763B1 EP 97915464 A EP97915464 A EP 97915464A EP 97915464 A EP97915464 A EP 97915464A EP 0889763 B1 EP0889763 B1 EP 0889763B1
Authority
EP
European Patent Office
Prior art keywords
punch
die
extrusion
counter
unit according
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
EP97915464A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0889763A1 (en
Inventor
Angelo Gandini
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.)
Fiocchi Munizioni SpA
Original Assignee
Fiocchi Munizioni 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 Fiocchi Munizioni SpA filed Critical Fiocchi Munizioni SpA
Publication of EP0889763A1 publication Critical patent/EP0889763A1/en
Application granted granted Critical
Publication of EP0889763B1 publication Critical patent/EP0889763B1/en
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, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS 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
    • B21C23/03—Making uncoated products by both direct and backward extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/18—Making uncoated products by impact extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE 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
    • B21C23/00—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
    • B21C—MANUFACTURE 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
    • B21C25/00—Profiling tools for metal extruding
    • B21C25/04—Mandrels
    • 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

Definitions

  • the present invention relates to an innovatory method of variable-thickness extrusion and to an extrusion unit applying said method.
  • the obtained article has a constant diameter and walls of constant thickness.
  • CH 633 980 discloses an extrusion device, wherein the counter-punch is supported by a spring in order to soften the raugh strain fluctuations connected with the metal flow in the extrusion chamber.
  • the general object of the present invention is to provide a method and an extrusion unit applying said method which enable articles having walls of variable thickness to be obtained.
  • non-extrusile materials such as ferrous materials for example.
  • Fig. 1a a first embodiment of an impact extrusion unit, generally identified by 10 and made in accordance with the invention.
  • Unit 10 comprises a punch 11 and a counter-punch 12, facing each other and axially movable within a die 13, so as to identify an extrusion chamber 14 therebetween.
  • the chamber within the die has a varying transverse size along the movement axis of the punch and counter-punch, unlike the known art in which the transverse size of the chamber is constant.
  • Fig. 1 shown in Fig. 1 is a barrel-shaped chamber of a maximum transverse size intermediate the ends.
  • a punch 11 is shown with a head 18 having a cone-shaped end 19 and a rear union length 20 for connection to a shank 21 of reduced section.
  • the shank can have a 7.37 mm diameter, with a connecting conicity of 10° and a 0.50 mm thickness of the cylindrical portion of the head.
  • the cone-shaped head enables accomplishment of a cone-shaped bottom which is advantageous in the case of cartridge cases.
  • the counter-punch is close to one entrance end of the punch into the die.
  • a metal blank 15 to be extruded is introduced into the die and subsequently the punch is forced towards the counter-punch, while the latter is caused to move backward, as shown in Fig. 1b.
  • the punch and couter-punch movements take place in the same direction but at different velocities (in particular the punch moves at a first velocity and the counter-punch at a second velocity smaller than the first one), so as to reduce the space between the respective faced heads and have an extrusion action between die and punch, whereas the relative flowing between the blank outside and the die is in favour of the extrusion operation.
  • the relative velocity between the die side wall and the extruded material between die and punch must be substantially zero. This enables extrusion of metal materials that traditionally are unable to be extruded, such as iron for example. It is also possible to use lower extrusion pressures, thereby the unit being subjected to less wear. Obviously, the absolute movement velocities of the punch and counter-punch relative to the die will depend on the type of the extruded material and the mechanical features of the extrusion unit.
  • the extrusion annulus formed between the die and punch has a varying thickness during the extrusion operation.
  • the punch head is caused to pass through areas of the die having different radial widths.
  • Fig. 1c Shown in Fig. 1c by way of example is an extrusion 16 the form of which is of variable diameter, which had been hitherto considered as unfeasible by extrusion.
  • a second embodiment 110 of an extrusion unit is shown in Fig. 2.
  • the extrusion unit 110 in addition to the above mentioned steps of the claimed method also carries out a further step.
  • unit 110 is comprised of a punch 111 and a counter-punch 112, facing each other and axially movable within a die 113, so as to identify an extrusion chamber 114 therebetween.
  • the chamber has varying transverse sizes along its axis. For instance, a chamber is shown which has a shape similar to the one already described above.
  • the die 113 has an end opening 117, from which the punch enters and which embodies the aperture for drawing the blank out. If opening 117 has a smaller width than the maximum width of the extrusion chamber, this opening constitutes the die for a second extrusion or forming operation, which is carried out on the blank when the punch is retracted and the counter-punch forces the blank out of the die (Fig. 2c).
  • the method according to the invention may comprise the further step of drawing the punch out of the die and causing advance of the counter-punch so as to extrude the blank through a die end, which end therefore constitutes the forming end for a further extrusion operation of the forward type.
  • This further step makes it possible to reproduce within the blank the variation which was present in the outer transverse size of the blank itself, whereas the outer transverse size of the drawn blank will be constant and equal to the extrusion opening 117.
  • the chamber shape and consequently the resulting extrusion shape is not limited to the one shown by way of example.
  • the extrusion unit 210 comprises a punch 211, a counter-punch 212 and a die 213 identifying an extrusion chamber 214.
  • the chamber has a varying transverse size along its axis getting bigger in a direction opposite to that of the punch, so as to form a truncated cone, for example.
  • the method of the invention is very advantageous for making cartridge cases.
  • cartridge cases with walls of varying thicknesses along the case axis are produced.
  • manufacture of cartridge cases in which a stronger wall is provided close to the area near their bottom, i.e. the blast-initiating area is made possible.
  • particular conformations of the detonation chamber can be obtained, as shown in Fig. 2.
  • movements between die, punch and counter-punch are obviously to be intended as relative movements, no matter which element is actually moved and which is maintained really stationary.
  • the die may have a shape different from that shown and movements producing articles having an outwardly thickened portion and an inwardly thickened portion can be easily conceived.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Extrusion Of Metal (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
EP97915464A 1996-03-29 1997-03-26 Variable-thickness extrusion method and extrusion unit in accordance with said method Expired - Lifetime EP0889763B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT96MI000624A IT1283320B1 (it) 1996-03-29 1996-03-29 Metodo di estrusione a spessore variabile e gruppo di estrusione secondo tale metodo
ITMI960624 1996-03-29
PCT/EP1997/001610 WO1997036701A1 (en) 1996-03-29 1997-03-26 Variable-thickness extrusion method and extrusion unit in accordance with said method

Publications (2)

Publication Number Publication Date
EP0889763A1 EP0889763A1 (en) 1999-01-13
EP0889763B1 true EP0889763B1 (en) 2002-03-13

Family

ID=11373823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97915464A Expired - Lifetime EP0889763B1 (en) 1996-03-29 1997-03-26 Variable-thickness extrusion method and extrusion unit in accordance with said method

Country Status (8)

Country Link
EP (1) EP0889763B1 (enrdf_load_stackoverflow)
AU (1) AU2293197A (enrdf_load_stackoverflow)
DE (1) DE69711030T2 (enrdf_load_stackoverflow)
HU (1) HU222308B1 (enrdf_load_stackoverflow)
IL (1) IL126170A (enrdf_load_stackoverflow)
IT (1) IT1283320B1 (enrdf_load_stackoverflow)
TR (1) TR199801945T2 (enrdf_load_stackoverflow)
WO (1) WO1997036701A1 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103464498A (zh) * 2012-06-06 2013-12-25 镇江建华轴承有限公司 轴承外圈特殊型腔精密加工方法
CN108043899A (zh) * 2017-12-20 2018-05-18 羊云霞 一种局部圆凸钢板条的制造系统
WO2018203110A1 (en) * 2017-05-04 2018-11-08 I.N.C.A. S.P.A. A Socio Unico Method for forming objects made of metal by backward extrusion and die for carrying out the method
CN111112364A (zh) * 2019-12-25 2020-05-08 北京机电研究所有限公司 一种适用于弹体类深孔挤压件的阶梯式深孔挤压工艺
DE102019002187A1 (de) * 2019-03-27 2020-10-01 Universität Stuttgart Verfahren und Vorrichtung zum Herstellen eines Bauteils mit Gewinde

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2899499B1 (fr) * 2006-04-11 2009-02-27 Manoir Ind Soc Par Actions Sim Procede d'extrusion de precision de pieces metalliques creuses et dispositif associe
DE102008027423A1 (de) * 2008-06-10 2009-12-17 Neumayer Tekfor Holding Gmbh Pressteil und Verfahren zu dessen Herstellung
EP3345694B1 (de) * 2017-01-05 2024-05-22 FELSS Systems GmbH Verfahren und vorrichtung zum insbesondere abschnittweisen verdicken einer plastisch verformbaren hohlkörperwand eines hohlkörpers sowie fertigungsverfahren und maschine zum fertigen eines hohlkörpers
CN111389944B (zh) * 2020-03-26 2021-01-29 燕山大学 一种厚壁圆筒挤压旋转成形方法
CN112517816B (zh) * 2020-10-16 2022-04-08 中北大学 外纵筋筒形件双向间歇式差速镦粗复合挤压成形方法
CN112517657B (zh) * 2020-10-16 2022-04-08 中北大学 外纵筋筒形件双向差速挤压成形方法
CN112517658B (zh) * 2020-10-16 2022-04-08 中北大学 外纵筋筒形件双向差速挤压成形模具
US12313386B2 (en) 2023-10-30 2025-05-27 Mannis Operations LLC Modifying a projectile casing

Family Cites Families (9)

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DE327315C (de) * 1920-01-23 1920-10-09 Oberschlesische Eisenbahn Beda Verfahren und Gesenk zur Herstellung von mit aeusseren Ansaetzen versehenen Hohlkoerpern
CH90356A (fr) * 1920-08-10 1921-09-01 Usines Thecla S A Dispositif pour la frappe à chaud des métaux.
US1702278A (en) * 1928-05-18 1929-02-19 Simons Abraham Method of making seamless containers
FR1112344A (fr) * 1953-11-12 1956-03-13 Kabel U Metallwerke Neumeyer A Procédé et dispositif d'estampage à la presse, en particulier à froid, de pièces de forme à collerette, en métal, de préférence en acier
DE2144006C3 (de) * 1971-09-02 1974-03-07 Kabel- Und Metallwerke Gutehoffnungshuette Ag, 3000 Hannover Verfahren zur Herstellung von Kegelzahnrädern
CH633980A5 (en) * 1980-03-05 1983-01-14 Tusa Sa Impact extrusion device
JPS58110118A (ja) * 1981-12-25 1983-06-30 Nissan Motor Co Ltd 筒状体の製造方法
JPS59199142A (ja) * 1983-04-27 1984-11-12 Tokai Rika Co Ltd 中空筒体の冷間鍛造法
JPS62107838A (ja) * 1985-11-05 1987-05-19 Toyota Motor Corp 底付テ−パ穴カツプの成形方法

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103464498A (zh) * 2012-06-06 2013-12-25 镇江建华轴承有限公司 轴承外圈特殊型腔精密加工方法
WO2018203110A1 (en) * 2017-05-04 2018-11-08 I.N.C.A. S.P.A. A Socio Unico Method for forming objects made of metal by backward extrusion and die for carrying out the method
CN108043899A (zh) * 2017-12-20 2018-05-18 羊云霞 一种局部圆凸钢板条的制造系统
DE102019002187A1 (de) * 2019-03-27 2020-10-01 Universität Stuttgart Verfahren und Vorrichtung zum Herstellen eines Bauteils mit Gewinde
DE102019002187B4 (de) * 2019-03-27 2020-10-15 Universität Stuttgart Verfahren und Vorrichtung zum Herstellen eines Bauteils mit Gewinde
CN111112364A (zh) * 2019-12-25 2020-05-08 北京机电研究所有限公司 一种适用于弹体类深孔挤压件的阶梯式深孔挤压工艺

Also Published As

Publication number Publication date
HUP9903345A2 (hu) 2000-02-28
IT1283320B1 (it) 1998-04-16
IL126170A0 (en) 1999-05-09
IL126170A (en) 2001-09-13
AU2293197A (en) 1997-10-22
DE69711030D1 (de) 2002-04-18
WO1997036701A1 (en) 1997-10-09
ITMI960624A0 (enrdf_load_stackoverflow) 1996-03-29
DE69711030T2 (de) 2002-09-19
EP0889763A1 (en) 1999-01-13
TR199801945T2 (xx) 1999-02-22
HU222308B1 (hu) 2003-06-28
HUP9903345A3 (en) 2000-04-28
ITMI960624A1 (it) 1997-09-29

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