EP0889763A1 - 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 methodInfo
- Publication number
- EP0889763A1 EP0889763A1 EP97915464A EP97915464A EP0889763A1 EP 0889763 A1 EP0889763 A1 EP 0889763A1 EP 97915464 A EP97915464 A EP 97915464A EP 97915464 A EP97915464 A EP 97915464A EP 0889763 A1 EP0889763 A1 EP 0889763A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- punch
- die
- counter
- extrusion
- blank
- 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.)
- Granted
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)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Extrusion Of Metal (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
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 |
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 true EP0889763A1 (en) | 1999-01-13 |
EP0889763B1 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 (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) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2899499B1 (en) * | 2006-04-11 | 2009-02-27 | Manoir Ind Soc Par Actions Sim | PRECISION EXTRUSION METHOD FOR HOLLOW METAL PIECES AND ASSOCIATED DEVICE |
DE102008027423A1 (en) * | 2008-06-10 | 2009-12-17 | Neumayer Tekfor Holding Gmbh | Pressing part and method for its production |
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 |
EP3345694B1 (en) * | 2017-01-05 | 2024-05-22 | FELSS Systems GmbH | Method and device for locally thickening a hollow body |
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 |
CN111389944B (en) * | 2020-03-26 | 2021-01-29 | 燕山大学 | Extrusion rotary forming method for thick-wall cylinder |
CN112517657B (en) * | 2020-10-16 | 2022-04-08 | 中北大学 | Bidirectional differential 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 |
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 |
Family Cites Families (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 |
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 |
DE2144006C3 (en) * | 1971-09-02 | 1974-03-07 | Kabel- Und Metallwerke Gutehoffnungshuette Ag, 3000 Hannover | Process for the manufacture of bevel gears |
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 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 DE DE69711030T patent/DE69711030T2/en not_active Expired - Fee Related
- 1997-03-26 TR TR1998/01945T patent/TR199801945T2/en unknown
- 1997-03-26 WO PCT/EP1997/001610 patent/WO1997036701A1/en active IP Right Grant
- 1997-03-26 AU AU22931/97A patent/AU2293197A/en not_active Abandoned
- 1997-03-26 HU HU9903345A patent/HU222308B1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9736701A1 * |
Also Published As
Publication number | Publication date |
---|---|
ITMI960624A0 (en) | 1996-03-29 |
HUP9903345A2 (en) | 2000-02-28 |
HU222308B1 (en) | 2003-06-28 |
DE69711030T2 (en) | 2002-09-19 |
AU2293197A (en) | 1997-10-22 |
EP0889763B1 (en) | 2002-03-13 |
DE69711030D1 (en) | 2002-04-18 |
IT1283320B1 (en) | 1998-04-16 |
ITMI960624A1 (en) | 1997-09-29 |
IL126170A (en) | 2001-09-13 |
IL126170A0 (en) | 1999-05-09 |
HUP9903345A3 (en) | 2000-04-28 |
TR199801945T2 (en) | 1999-02-22 |
WO1997036701A1 (en) | 1997-10-09 |
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