EP0531612A1 - Méthode pour éjecter l'air emprisonné entre la billette et la filière dans une presse à extrusion - Google Patents

Méthode pour éjecter l'air emprisonné entre la billette et la filière dans une presse à extrusion Download PDF

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Publication number
EP0531612A1
EP0531612A1 EP92106740A EP92106740A EP0531612A1 EP 0531612 A1 EP0531612 A1 EP 0531612A1 EP 92106740 A EP92106740 A EP 92106740A EP 92106740 A EP92106740 A EP 92106740A EP 0531612 A1 EP0531612 A1 EP 0531612A1
Authority
EP
European Patent Office
Prior art keywords
carrier
billet
plunger
hydraulic cylinder
piston assemblies
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
Application number
EP92106740A
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German (de)
English (en)
Other versions
EP0531612B1 (fr
Inventor
Renato Seminari
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.)
SMS Group SpA
Original Assignee
Innse Innocenti Engineering SpA
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Publication date
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Application filed by Innse Innocenti Engineering SpA filed Critical Innse Innocenti Engineering SpA
Publication of EP0531612A1 publication Critical patent/EP0531612A1/fr
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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
    • B21C27/00—Containers for metal to be extruded
    • B21C27/04—Venting metal-container chamber
    • 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
    • B21C23/21—Presses specially adapted for extruding metal
    • B21C23/211—Press driving devices

Definitions

  • This invention relates to a method for carrying out the ejection cycle of the air stored-up between die and billet in a billet extruding press of the type which comprises a billet carrier reciprocable toward and away from said die along a longitudinal extrusion axis of the press, a plunger reciprocable toward and away from said carrier along said axis, said carrier and plunger being respectively provided, the former with secondary hydraulic cylinder/piston assemblies, and the latter with a primary hydraulic cylinder/piston assembly and associated secondary hydraulic cylinder/piston assemblies, and a hydraulic oil transfer system extending between pumping means and said hydraulic cylinder/piston assemblies.
  • the overall operation cycle of extrusion presses currently includes a secondary, air ejection, cycle, which consists of sequentially stopping the press and discontinuing the extrusion process, de-pressurizing the working oil to the plunger, retracting the plunger, and retracting the carrier.
  • the underlying technical problem of this invention is to provide an extrusion method and press having, respectively, such functional and structural features as to carry out an air ejection cycle during the extrusion of a billet, while overcoming the above-mentioned drawbacks with which the prior art is beset.
  • a method according to the invention being characterized in that it consists of temporarily resisting the thrust of the plunger against the billet during the extrusion process, as well as the thrust of the carrier against the extrusion die, to allow said ejection of air from between the billet and the die.
  • the invention also provides a press of the type indicated which is characterized in that it comprises at least one source of pressurized oil connected to the secondary hydraulic cylinder/piston assemblies for the carrier and the plunger, which source is effective to apply a predetermined force to both of the latter by means of said secondary hydraulic cylinder/piston assemblies, appropriate to temporarily resist the thrust forces applied for by the billet extrusion.
  • a press which comprises a plunger 2 provided with a primary hydraulic cylinder/piston assembly 3 and two secondary hydraulic cylinder/piston assemblies 4.
  • the secondary hydraulic cylinder/piston assemblies 4 are each comprised of a double-acting piston 4a movable within a cylinder 4b where it defines a full-section chamber 4c and an annular chamber 4d.
  • full-section chamber 4c means the volume enclosed between the walls of the cylinder 4b and the piston 4a and intended to be filled completely with oil; likewise, annular section chamber 4d means the volume enclosed between the cylinder and the piston walls which is partly occupied by a piston rod, not referenced in the drawing.
  • the press 1 also comprises a carrier 5 for a billet (b) which is linked to a respective pair of secondary hydraulic cylinder/piston assemblies 6; similarly to the previous ones, each hydraulic cylinder/piston assembly 6 comprises a double-acting piston 6a movable within a cylinder 6b where it defines a full-section chamber 6c and an annular chamber 6d.
  • chambers 6c and 6d as have been made for the corresponding chambers of hydraulic cylinder/piston assemblies 4.
  • the plunger 2 is reciprocable toward and away from the carrier which is, in turn, reciprocable toward and away from an extrusion die M; the plunger and carrier are moved along the same direction, which coincides with the extrusion axis of the press.
  • the press 1 is provided with a hydraulic system 7 for circulating oil through said hydraulic cylinder/piston assemblies, which system may be basically composed as follows.
  • a first branch 8 of the hydraulic system 7 connects the primary cylinder/piston assembly 3 and the full-section chambers 4c of the secondary cylinder/piston assemblies 4 to a set of main supply, displacement pumps 9, 10.
  • a second branch 8a of the hydraulic system 7 connects a first hydropneumatic accumulator 11 to the annular chambers 4d of the secondary cylinder/piston assemblies 4 for the plunger 2; the accumulator 11 is provided with a pilot solenoid valve 12 for a cartridge valve 13.
  • a third branch 14 of the hydraulic system 7 extends from the full-section chambers 8c of the secondary hydraulic cylinder/piston assemblies 6 for the carrier 5 to said pumps 9 and 10; similarly as above, there is also a fourth branch 14a connecting a second hydropneumatic accumulator 15 to the respective annular chambers 6d of cylinder/piston assemblies 6. Lastly, the second hydropneumatic accumulator 15 is also provided with a pilot solenoid valve 16 for a corresponding cartridge valve 17.
  • a pre-fill valve 19 Located at an oil inlet 18 to the primary cylinder/piston assembly 3 for the plunger 2 is a pre-fill valve 19 having a pressure relief valve 20 associated therewith.
  • the pumps 9 and 10 have respective by-pass blocks 21 and 22 to be explained later in connection with the operation of the invention.
  • An additional pump 25 has a delivery side 25a connected to the accumulators 11, 15 and 23; a set of corresponding check valves 26, 27 and 28 make the connection of said delivery side 25a to each accumulator 11, 15 and 23 independent of the other two accumulators.
  • a pressure transducer 29 is associated with the pre-fill valve 19.
  • That condition is incurred when the billet b in the carrier 5 is compressed by the plunger 2 occupying an advanced position toward the carrier and being pressed on it; the carrier 5 is, in turn, at an advanced, juxtaposed position to the extrusion die M against which it is pushed.
  • the pressure relief valve 20 is opened to lower the pressure in the chambers 4c and the primary cylinder/piston assembly 3; in addition, the hold-up solenoid valve 24 is de-energized.
  • the pressure transducer 29 detects the pressure drop in the oil supply to the primary cylinder/piston assembly 3, and on a predetermined pressure level being attained, energizes the solenoid valves 12 and 16 to operate the corresponding cartridge valves 13 and 17.
  • the main pumps 9, 10 are by-passed by the respective blocks 21 and 22 inhibiting the delivery of oil to the two branches 8, 14 of the hydraulic system 7, while holding them in their steady-state operational condition entered during the extrusion process.
  • the hydropneumatic accumulators 11, 15 are placed, upon the valves 13, 17 being opened, in communication with the annular chambers 4d, 6d of the respective secondary cylinder/piston assemblies 4, 6 of the plunger 2 and the carrier 5.
  • oil is under a predetermined pressure and can flow to the annular chambers 4d, 6d upon the corresponding valves 13, 17 being opened.
  • the force developed by the pressure respectively applied by the oil contained in the accumulators 11 and 15 to the pistons 4a and 6a, is adequate to compensate the force originated by the pressure exerted by the oil still present in the full-section chambers 4c, 6c from the previous extrusion step initially performed by the press 1, on the corresponding pistons 4a and 6a.
  • This force compensation holds the carrier and plunger in a state of equilibrium, the carrier and plunger forward stroke toward the extrusion die and the carrier, respectively, being then brought to a stop.
  • the equilibrium of the forces acting within the secondary cylinder/piston assemblies 4 and 6 of the plunger and the carrier can be maintained without inducing backward movement in the carrier and the plunger.
  • This pressure drop takes place in a succession of decreasing values and within a time period to be set by the user.
  • the magnitudes of that time period and the pressure drop values are dependent on the emptying rates of the full-section chambers 4c and the primary cylinder-piston assembly 3, as well as on the storage pressure of the oil inside the accumulator 11; the higher the pressure within the accumulator 11, the faster will the oil flow from the accumulator 11 to the annular chambers 4d.
  • the pressure of the air trapped between the billet b and the extrusion die M is such that, as the carrier ceases to be pressed against the die and the plunger no longer pushes on the billet in the carrier, the air can rush out of the space in which it was retained.
  • the additional pump 25 will supply the hydropneumatic accumulator 23, whereto it is communicated by de-energizing the valve 24.
  • the solenoid valves 12 and 16 are de-energized, the pressure relief valve 20 is closed, the pumps 9 and 10 are again connected to the branches 8 and 14 of the hydraulic system and the hold-up solenoid valve 24 is energized to communicate, during this phase, the accumulator 23 to the full-section chambers 6c of the hydraulic cylinder/piston assemblies 6 for the carrier 5.
  • the press 1 is thus made ready to resume extrusion of the billet b as normal, with the carrier and the plunger at an unchanged position from the initial condition, that is the position taken during the extrusion step preceding the air venting cycle.
  • the additional pump 25 restores, with the aid of valves 24, 26, 27 and 28, the interiors of the accumulators 11, 15 and 23 back to their pressure settings, in readiness for a successive cycle of air ejection from the press.
  • a press according to the invention can afford a number of advantages.
  • the pressurized oil within accumulators 11, 15 and the actuating and hold-up accumulator 23 allows a pressure to attain predetermined high levels respectively in the annular chambers 4d, 6d and the full-section chambers 6c, and be at once available with no transients.
  • the use of the hydropneumatic accumulators enables optimum control of each operation step of the press, and of the plunger and carrier movements, compared to that afforded by just displacement pumps.
  • This movement control can be advantageously optimized by the adoption of a timing arrangement therefor which, as mentioned above, allows the equilibrium of the pressures acting in the annular 4d and 6d and full-section chambers 4c and 6c of the respective secondary cylinder/piston assemblies 4 and 6 for the plunger and the carrier to be kept constant over time.
  • hydropneumatic accumulators have no operational of transient states as have the pumps 9, 10 and 25, and allow the duration of an air ejection cycle to be further reduced, thereby improving the press productivity.
  • a further advantage of the invention is that, through the use or the hydropneumatic accumulators and their respective by-pass blocks, on resuming the extrusion process after completion of an air ejection cycle, the main pumps are already in an optimum steady-state operation condition without requiring any adjustment and attendant operation transient.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Powder Metallurgy (AREA)
EP92106740A 1991-09-13 1992-04-21 Méthode pour éjecter l'air emprisonné entre la billette et la filière dans une presse à extrusion Expired - Lifetime EP0531612B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI912427 1991-09-13
ITMI912427A IT1251314B (it) 1991-09-13 1991-09-13 Pressa per estrusione di metalli in genere ed in particolare dell'alluminio

Publications (2)

Publication Number Publication Date
EP0531612A1 true EP0531612A1 (fr) 1993-03-17
EP0531612B1 EP0531612B1 (fr) 1996-07-31

Family

ID=11360662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92106740A Expired - Lifetime EP0531612B1 (fr) 1991-09-13 1992-04-21 Méthode pour éjecter l'air emprisonné entre la billette et la filière dans une presse à extrusion

Country Status (6)

Country Link
EP (1) EP0531612B1 (fr)
JP (1) JPH05212435A (fr)
AT (1) ATE140885T1 (fr)
DE (1) DE69212549T2 (fr)
ES (1) ES2090404T3 (fr)
IT (1) IT1251314B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0623402A1 (fr) * 1993-05-06 1994-11-09 Clecim Procédé de filage de métal et presse à filer perfectionnée
US5445004A (en) * 1993-11-24 1995-08-29 Breda Danieli Extrusion Extrusion method with gas evacuation, and extrusion press
EP1134044A2 (fr) * 2000-02-15 2001-09-19 SMS EUMUCO GmbH Système d'entraínement pour une presse d'extrusion de métaux
US20150107324A1 (en) * 2012-04-13 2015-04-23 Ube Machinery Corporation, Ltd. Extrusion press machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010144840A (ja) * 2008-12-19 2010-07-01 Ube Machinery Corporation Ltd 押出プレス
DE102012009182A1 (de) 2012-05-10 2013-11-14 Sms Meer Gmbh Hydraulische Strangpresse sowie Verfahren zum Betrieb einer hydraulischen Strangpresse

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675125A (en) * 1948-01-14 1954-04-13 Genders Reginald Direct and indirect extrusion of metals
DE1039981B (de) * 1951-11-29 1958-10-02 Reginald Victor Rowles Hydraulische Presse, insbesondere Strangpresse, fuer die Metallverarbeitung
FR2386366A1 (fr) * 1977-04-04 1978-11-03 Davy Loewy Ltd Presse a extrusion universelle a tampon amovible ou inamovible

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675125A (en) * 1948-01-14 1954-04-13 Genders Reginald Direct and indirect extrusion of metals
DE1039981B (de) * 1951-11-29 1958-10-02 Reginald Victor Rowles Hydraulische Presse, insbesondere Strangpresse, fuer die Metallverarbeitung
FR2386366A1 (fr) * 1977-04-04 1978-11-03 Davy Loewy Ltd Presse a extrusion universelle a tampon amovible ou inamovible

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0623402A1 (fr) * 1993-05-06 1994-11-09 Clecim Procédé de filage de métal et presse à filer perfectionnée
FR2704783A1 (fr) * 1993-05-06 1994-11-10 Clecim Sa Procédé de filage de métal et presse à filer perfectionnée.
US5613393A (en) * 1993-05-06 1997-03-25 Clecim Metal extrusion process and extrusion press
US5445004A (en) * 1993-11-24 1995-08-29 Breda Danieli Extrusion Extrusion method with gas evacuation, and extrusion press
EP1134044A2 (fr) * 2000-02-15 2001-09-19 SMS EUMUCO GmbH Système d'entraínement pour une presse d'extrusion de métaux
EP1134044A3 (fr) * 2000-02-15 2003-05-21 SMS EUMUCO GmbH Système d'entraínement pour une presse d'extrusion de métaux
US20150107324A1 (en) * 2012-04-13 2015-04-23 Ube Machinery Corporation, Ltd. Extrusion press machine
US9707606B2 (en) * 2012-04-13 2017-07-18 Ube Machinery Corporation Extrusion press machine

Also Published As

Publication number Publication date
ITMI912427A0 (it) 1991-09-13
ITMI912427A1 (it) 1993-03-14
ES2090404T3 (es) 1996-10-16
DE69212549D1 (de) 1996-09-05
IT1251314B (it) 1995-05-08
DE69212549T2 (de) 1997-02-27
JPH05212435A (ja) 1993-08-24
ATE140885T1 (de) 1996-08-15
EP0531612B1 (fr) 1996-07-31

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