WO1997036701A1 - 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 PDFInfo
- Publication number
- WO1997036701A1 WO1997036701A1 PCT/EP1997/001610 EP9701610W WO9736701A1 WO 1997036701 A1 WO1997036701 A1 WO 1997036701A1 EP 9701610 W EP9701610 W EP 9701610W WO 9736701 A1 WO9736701 A1 WO 9736701A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- punch
- die
- counter
- extrusion
- blank
- Prior art date
Links
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
- B21C23/03—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 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
- B21C23/18—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 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
- 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
- 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.
- a method of cold impact extrusion for hollow metal elements comprises the steps of placing a blank in a die, pressing the blank within the die between a punch and a counter-punch facing each other, during compression moving the punch forward in the die at a first velocity and moving the counter-punch backward at a second velocity slower than the first one, so as to reduce the distance between the punch and counter-punch, during said movement causing the punch head to pass through die areas having different distances from the punch sides so as to identify an extrusion annulus of variable width between the die and punch.
- a cold impact extrusion unit for hollow metal elements in particular cartridge cases, has been devised, which comprises a punch and a counter-punch facing each other and coaxially movable within a die to identify an extrusion chamber therebetween, characterized in that the extrusion chamber has a varying transverse size along the movement axis of the punch and counter-punch.
- FIG. 1 diagrammatically shows extrusion steps with a first extrusion unit in accordance with the invention
- - Fig. 2 diagrammatically shows extrusion steps with a second extrusion unit in accordance with the invention
- - Fig. 3 diagrammatically shows extrusion steps with a third extrusion unit in accordance with the invention
- - Fig. 4 is an enlarged view of a punch head.
- Fig. la shown in Fig. la is 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. According to the method of the invention, as shown in Fig.
- 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. lb.
- 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 wal] 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.
- 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. In other words, the punch head is caused to pass through areas of the die having different radial widths.
- Fig. lc As shown in Fig. lc, once the extrusion stroke has been completed, punch and counter-punch are retracted and the die is opened in a transverse direction so as to free the extruded piece or extrusion. Shown in Fig. lc 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 113 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.
- 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.
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)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU22931/97A AU2293197A (en) | 1996-03-29 | 1997-03-26 | Variable-thickness extrusion method and extrusion unit in accordance with said method |
IL12617097A IL126170A (en) | 1996-03-29 | 1997-03-26 | Variable-thickness extrusion method and extrusion unit in accordance with said method |
DE69711030T DE69711030T2 (en) | 1996-03-29 | 1997-03-26 | METHOD AND DEVICE FOR EXTRUDING PRODUCTS WITH VARIABLE CROSS SECTION |
EP97915464A EP0889763B1 (en) | 1996-03-29 | 1997-03-26 | Variable-thickness extrusion method and extrusion unit in accordance with said method |
HU9903345A HU222308B1 (en) | 1996-03-29 | 1997-03-26 | Method and extrusion unit for extrusion of bored metal products especially of cartridge cases |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT96MI000624A IT1283320B1 (en) | 1996-03-29 | 1996-03-29 | VARIABLE THICKNESS EXTRUSION METHOD AND EXTRUSION GROUP ACCORDING TO THIS METHOD |
ITMI96A000624 | 1996-03-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997036701A1 true WO1997036701A1 (en) | 1997-10-09 |
Family
ID=11373823
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/001610 WO1997036701A1 (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 (en) |
AU (1) | AU2293197A (en) |
DE (1) | DE69711030T2 (en) |
HU (1) | HU222308B1 (en) |
IL (1) | IL126170A (en) |
IT (1) | IT1283320B1 (en) |
TR (1) | TR199801945T2 (en) |
WO (1) | WO1997036701A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2899499A1 (en) * | 2006-04-11 | 2007-10-12 | Manoir Ind Soc Par Actions Sim | PRECISION EXTRUSION METHOD FOR HOLLOW METAL PIECES AND ASSOCIATED DEVICE |
WO2009149695A1 (en) * | 2008-06-10 | 2009-12-17 | Neumayer Tekfor Holding Gmbh | Pressed part and method for the production thereof |
CN112517816A (en) * | 2020-10-16 | 2021-03-19 | 中北大学 | Bidirectional intermittent differential upsetting composite extrusion forming method for outer longitudinal rib cylindrical part |
CN112517657A (en) * | 2020-10-16 | 2021-03-19 | 中北大学 | Bidirectional differential extrusion forming method for outer longitudinal rib cylindrical part |
CN112517658A (en) * | 2020-10-16 | 2021-03-19 | 中北大学 | Bidirectional differential extrusion forming die for external longitudinal rib cylindrical part |
US20210229160A1 (en) * | 2017-01-05 | 2021-07-29 | Felss Systems Gmbh | Method and device for thickening a plastically deformable hollow body wall of a hollow body, in particular in portions, and manufacturing method and machine for producing a hollow body |
US11110504B1 (en) * | 2020-03-26 | 2021-09-07 | Yanshan University | Method of forming thick-walled cylinder by spinning |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103464498A (en) * | 2012-06-06 | 2013-12-25 | 镇江建华轴承有限公司 | Precise processing method for specially-shaped cavity of bearing outer ring |
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 |
CN108043899B (en) * | 2017-12-20 | 2019-01-11 | 万金芬 | A kind of manufacture system of part boss steel plate strip |
DE102019002187B4 (en) * | 2019-03-27 | 2020-10-15 | Universität Stuttgart | Method and device for producing a component with a thread |
CN111112364B (en) * | 2019-12-25 | 2022-07-19 | 北京机电研究所有限公司 | Stepped deep hole extrusion process suitable for elastomer deep hole extrusion piece |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE327315C (en) * | 1920-01-23 | 1920-10-09 | Oberschlesische Eisenbahn Beda | Method and die for the production of hollow bodies provided with external attachments |
CH90356A (en) * | 1920-08-10 | 1921-09-01 | Usines Thecla S A | Device for hot forging metals. |
US1702278A (en) * | 1928-05-18 | 1929-02-19 | Simons Abraham | Method of making seamless containers |
GB836706A (en) * | 1953-11-12 | 1960-06-09 | Kabel Und Metallwerke Neumeyer | Improvements relating to the production of hollow metal bodies by pressing |
FR2150945A1 (en) * | 1971-09-02 | 1973-04-13 | Kabel Metallwerke Ghh | |
CH633980A5 (en) * | 1980-03-05 | 1983-01-14 | Tusa Sa | Impact extrusion device |
JPS58110118A (en) * | 1981-12-25 | 1983-06-30 | Nissan Motor Co Ltd | Production of cylindrical body |
JPS59199142A (en) * | 1983-04-27 | 1984-11-12 | Tokai Rika Co Ltd | Cold forging method of hollow cylindrical body |
JPS62107838A (en) * | 1985-11-05 | 1987-05-19 | Toyota Motor Corp | Method for forming bottomed cup with tapered bore |
-
1996
- 1996-03-29 IT IT96MI000624A patent/IT1283320B1/en active IP Right Grant
-
1997
- 1997-03-26 HU HU9903345A patent/HU222308B1/en not_active IP Right Cessation
- 1997-03-26 DE DE69711030T patent/DE69711030T2/en not_active Expired - Fee Related
- 1997-03-26 IL IL12617097A patent/IL126170A/en not_active IP Right Cessation
- 1997-03-26 EP EP97915464A patent/EP0889763B1/en not_active Expired - Lifetime
- 1997-03-26 AU AU22931/97A patent/AU2293197A/en not_active Abandoned
- 1997-03-26 TR TR1998/01945T patent/TR199801945T2/en unknown
- 1997-03-26 WO PCT/EP1997/001610 patent/WO1997036701A1/en active IP Right Grant
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE327315C (en) * | 1920-01-23 | 1920-10-09 | Oberschlesische Eisenbahn Beda | Method and die for the production of hollow bodies provided with external attachments |
CH90356A (en) * | 1920-08-10 | 1921-09-01 | Usines Thecla S A | Device for hot forging metals. |
US1702278A (en) * | 1928-05-18 | 1929-02-19 | Simons Abraham | Method of making seamless containers |
GB836706A (en) * | 1953-11-12 | 1960-06-09 | Kabel Und Metallwerke Neumeyer | Improvements relating to the production of hollow metal bodies by pressing |
FR2150945A1 (en) * | 1971-09-02 | 1973-04-13 | Kabel Metallwerke Ghh | |
CH633980A5 (en) * | 1980-03-05 | 1983-01-14 | Tusa Sa | Impact extrusion device |
JPS58110118A (en) * | 1981-12-25 | 1983-06-30 | Nissan Motor Co Ltd | Production of cylindrical body |
JPS59199142A (en) * | 1983-04-27 | 1984-11-12 | Tokai Rika Co Ltd | Cold forging method of hollow cylindrical body |
JPS62107838A (en) * | 1985-11-05 | 1987-05-19 | Toyota Motor Corp | Method for forming bottomed cup with tapered bore |
Non-Patent Citations (3)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 007, no. 215 (M - 244) 22 September 1983 (1983-09-22) * |
PATENT ABSTRACTS OF JAPAN vol. 009, no. 067 (M - 366) 27 March 1985 (1985-03-27) * |
PATENT ABSTRACTS OF JAPAN vol. 011, no. 323 (M - 634) 21 October 1987 (1987-10-21) * |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2899499A1 (en) * | 2006-04-11 | 2007-10-12 | Manoir Ind Soc Par Actions Sim | PRECISION EXTRUSION METHOD FOR HOLLOW METAL PIECES AND ASSOCIATED DEVICE |
WO2007116151A1 (en) * | 2006-04-11 | 2007-10-18 | Manoir Industries | Method for the precision extrusion of hollow metal components and associated device |
WO2009149695A1 (en) * | 2008-06-10 | 2009-12-17 | Neumayer Tekfor Holding Gmbh | Pressed part and method for the production thereof |
US20210229160A1 (en) * | 2017-01-05 | 2021-07-29 | Felss Systems Gmbh | Method and device for thickening a plastically deformable hollow body wall of a hollow body, in particular in portions, and manufacturing method and machine for producing a hollow body |
US11890667B2 (en) * | 2017-01-05 | 2024-02-06 | Felss Systems Gmbh | Method and device for thickening a plastically deformable hollow body wall of a hollow body, in particular in portions, and manufacturing method and machine for producing a hollow body |
US11110504B1 (en) * | 2020-03-26 | 2021-09-07 | Yanshan University | Method of forming thick-walled cylinder by spinning |
CN112517816A (en) * | 2020-10-16 | 2021-03-19 | 中北大学 | Bidirectional intermittent differential upsetting composite extrusion forming method for outer longitudinal rib cylindrical part |
CN112517657A (en) * | 2020-10-16 | 2021-03-19 | 中北大学 | Bidirectional differential extrusion forming method for outer longitudinal rib cylindrical part |
CN112517658A (en) * | 2020-10-16 | 2021-03-19 | 中北大学 | Bidirectional differential extrusion forming die for external longitudinal rib cylindrical part |
CN112517816B (en) * | 2020-10-16 | 2022-04-08 | 中北大学 | Bidirectional intermittent differential upsetting composite extrusion forming method for outer longitudinal rib cylindrical part |
CN112517658B (en) * | 2020-10-16 | 2022-04-08 | 中北大学 | Bidirectional differential extrusion forming die for external longitudinal rib cylindrical part |
Also Published As
Publication number | Publication date |
---|---|
ITMI960624A0 (en) | 1996-03-29 |
DE69711030D1 (en) | 2002-04-18 |
IL126170A0 (en) | 1999-05-09 |
AU2293197A (en) | 1997-10-22 |
HU222308B1 (en) | 2003-06-28 |
IL126170A (en) | 2001-09-13 |
ITMI960624A1 (en) | 1997-09-29 |
TR199801945T2 (en) | 1999-02-22 |
DE69711030T2 (en) | 2002-09-19 |
EP0889763B1 (en) | 2002-03-13 |
HUP9903345A2 (en) | 2000-02-28 |
IT1283320B1 (en) | 1998-04-16 |
HUP9903345A3 (en) | 2000-04-28 |
EP0889763A1 (en) | 1999-01-13 |
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