EP0531612B1 - Method for carrying out the ejection cycle of the air stored between die and billet in a billet extruding press - Google Patents
Method for carrying out the ejection cycle of the air stored between die and billet in a billet extruding press Download PDFInfo
- Publication number
- EP0531612B1 EP0531612B1 EP92106740A EP92106740A EP0531612B1 EP 0531612 B1 EP0531612 B1 EP 0531612B1 EP 92106740 A EP92106740 A EP 92106740A EP 92106740 A EP92106740 A EP 92106740A EP 0531612 B1 EP0531612 B1 EP 0531612B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carrier
- plunger
- billet
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001125 extrusion Methods 0.000 claims abstract description 39
- 230000000712 assembly Effects 0.000 claims abstract description 32
- 238000000429 assembly Methods 0.000 claims abstract description 32
- 239000003921 oil Substances 0.000 claims description 18
- 238000005086 pumping Methods 0.000 claims description 7
- 230000001939 inductive effect Effects 0.000 claims description 4
- 239000010720 hydraulic oil Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 238000013022 venting Methods 0.000 description 5
- 230000001052 transient effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Images
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, without thereby inducing backward movement of the carrier and the plunger to allow said ejection of air from between the billet and the die.
- 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 6c 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)
Abstract
Description
- 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.
- During a generic metal, specifically aluminum, extrusion operation, there exists a need to eject the air trapped between the metal billet held in the carrier and the extrusion die as the plunger is moved forward against the billet to deform the metal material forming the billet and, hence, have the billet extruded.
- This is made necessary by that trapped air would attain very high pressure levels apt to prevent the deformed metal from passing through the die, so that the extrusion process as a whole is brought to a standstill.
- 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.
- These cycle steps take place upon suitable valves provided in the oil feed line to the plunger being opened and the feed to hydraulic cylinder/piston assemblies which drive the carrier and the plunger being reversed.
- The backward movements of the plunger and the carrier, which actually occur over a few millimeters distance, require that, on resuming the extrusion operation after an air ejection or, equivalently, venting cycle has taken place, the carrier and plunger be returned to the positions they occupied before the stop.
- Consequently, the operational time of the press related with the extrusion has been increased by the time required to restore the press to the same conditions that were established prior to discontinuing the extrusion process for the air-venting cycle.
- Since this fact involves energizing and reversing the operation of some parts of the hydraulic system, such as shut-off valves and pumping means, a series of downtime and operational transient states of the press significantly lengthen the air-venting cycle as a whole to the detriment of the press productivity.
- 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.
- This technical problem is solved by 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, without thereby inducing backward movement of the carrier and the plunger to allow said ejection of air from between the billet and the die.
- For carrying out the above method, the invention also provides a press defined in the claims which follow this description.
- Further features and the advantages of the invention will be more clearly apparent from an embodiment thereof, being described herein below by way of a non-limitative example with reference to the accompanying drawing, whose single figure shows diagramatically a press according to the invention.
- With reference to the drawing, generally shown at 1 is a press according to the invention 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 anannular chamber 4d. - Throughout this specification and the appended claims, full-
section chamber 4c means the volume enclosed between the walls of thecylinder 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 anannular chamber 6d. - The same considerations apply to
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.
- In addition, 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 theannular chambers 4d of the secondary cylinder/piston assemblies 4 for the plunger 2; theaccumulator 11 is provided with apilot solenoid valve 12 for acartridge valve 13. - A third branch 14 of the hydraulic system 7 extends from the full-section chambers 6c 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 secondhydropneumatic accumulator 15 to the respectiveannular chambers 6d of cylinder/piston assemblies 6. Lastly, the secondhydropneumatic accumulator 15 is also provided with apilot solenoid valve 16 for a corresponding cartridge valve 17. - Located at an
oil inlet 18 to the primary cylinder/piston assembly 3 for the plunger 2 is apre-fill valve 19 having apressure relief valve 20 associated therewith. Thepumps 9 and 10 have respective by-pass blocks - A third, actuation and hold-up hydropneumatic accumulator 23, provided with a respective hold-
up solenoid valve 24, is connected to the full-section chambers 6c of the hydraulic cylinder/piston assemblies 6 driving the carrier 5. - An
additional pump 25 has adelivery side 25a connected to theaccumulators corresponding check valves delivery side 25a to eachaccumulator - A
pressure transducer 29 is associated with thepre-fill valve 19. - The operation of the above press during an air election cycle will be now described.
- The condition attained during the extrusion of a billet b presented in the carrier 5 is assumed for the initial reference condition of the press 1.
- 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.
- Under the initial condition, the primary cylinder-piston assembly 3 and the full-
section chambers 4c and 6c are respectively supplied with pressurized oil from thepumps 9 and 10;solenoid valve 24 is energized. - Starting from this initial condition, the
pressure relief valve 20 is opened to lower the pressure in thechambers 4c and the primary cylinder/piston assembly 3; in addition, the hold-upsolenoid valve 24 is de-energized. Thepressure 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 thesolenoid valves corresponding cartridge valves 13 and 17. - At the same time, the
main pumps 9, 10 are by-passed by therespective blocks - The
hydropneumatic accumulators valves 13, 17 being opened, in communication with theannular chambers - Within the
hydropneumatic accumulators annular chambers corresponding valves 13, 17 being opened. - The force developed by the pressure respectively applied by the oil contained in the
accumulators 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 thecorresponding 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. In fact, by suitably timing the energization of the
solenoid valves - It should be noted that on the
pressure relief valve 20 being opened, the pressure in the full-section chambers 4c and the primary cylinder/piston assembly 3 drops quickly also on account of the action of the pressurized oil from theaccumulator 11. - This pressure drop takes place in a succession of decreasing values and within a time period to be set by the user. In fact, 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 theaccumulator 11; the higher the pressure within theaccumulator 11, the faster will the oil flow from theaccumulator 11 to theannular 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.
- Simultaneously with the ejection of air just described, the
additional pump 25 will supply the hydropneumatic accumulator 23, whereto it is communicated by de-energizing thevalve 24. - Subsequently to air venting, the
solenoid valves pressure relief valve 20 is closed, thepumps 9 and 10 are again connected to the branches 8 and 14 of the hydraulic system and the hold-upsolenoid 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.
- Once the billet extrusion process is resumed, the
additional pump 25 restores, with the aid ofvalves accumulators - A press according to the invention can afford a number of advantages.
- The pressurized oil within
accumulators annular chambers - 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. - Also, the hydropneumatic accumulators have no operational of transient states as have the
pumps - 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.
- Lastly, it should be emphasized that in order to have the air ejection cycle carried out, it has not been necessary to open the pre-fill valve, but to just energize the pressure relief valve, thereby affording additional savings in the time required to complete the whole ejection cycle.
Claims (7)
- A method for carrying out the ejection cycle of the air stored between a die (M) and a billet (b) in a billet extruding press of the type which comprises a billet (b) carrier (5) reciprocable toward and away from the die (M) along a longitudinal extrusion axis of the press, a plunger (2) reciprocable toward and away from said carrier (5) along said axis, said carrier (5) and plunger (2) being respectively provided, the former with secondary hydraulic cylinder/piston assemblies (16), and the latter with a primary hydraulic cylinder/piston assembly (3) and associated secondary hydraulic cylinder/piston assemblies (4), a hydraulic oil transfer system (7) extending between pumping means (9,10) and said hydraulic cylinder/piston assemblies (6;3 and 4), characterized in that it consists of temporarily resisting the thrust of the plunger (2) against the billet (b) during the extrusion process as well as the thrust of the carrier (5) against the extrusion die (M), without thereby inducing backward movement of the carrier and the plunger to allow of said ejection of air stored between the billet (b) and the die (M).
- A press for carrying out the method of Claim 1, of a type which comprises a carrier (5) for supporting a billet (b), reciprocable toward and away from a die (M) along a longitudinal extrusion axis of the press, a plunger (2) reciprocable toward and away from said carrier (5) along said axis, said carrier (5) and plunger (2) being respectively provided, the former with secondary hydraulic cylinder/piston assemblies (16), and the latter with a primary hydraulic cylinder/piston assembly (3) and associated secondary hydraulic cylinder/piston assemblies (4), a hydraulic oil transfer system (7) extending between pumping means (9,10) and said hydraulic cylinder/piston assemblies (6;3 and 4), characterized in that it comprises a means 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 without thereby inducing backward movement of the carrier and the plunger, which means includes a source (11,15) of pressurized oil connected to the secondary hydraulic cylinder/piston assemblies (6 and 4) for the carrier (5) and the plunger (2), which source is effective to apply a predetermined force to both of the latter by means of said secondary hydraulic cylinder/piston assemblies (6 and 4) appropriate to temporarily resist the thrust forces brought to play by the billet (b) extrusion.
- An extrusion press according to Claim 2, characterized in that said source of pressurized oil comprises first and second hydropneumatic accumulators (11,15) respectively connected to said secondary hydraulic cylinder/piston assemblies (4 and 6) for the plunger (2) and the carrier (5) over second (8a) and fourth (14a) branches of the hydraulic system (7).
- An extrusion press according to Claim 3, characterized in that it comprises:
a first branch (8) of said hydraulic circuit extending from said pumping means (9,10) to the primary (3) cylinder/piston assembly (3) and to respective full-section chambers (4c) of the secondary cylinder/piston assemblies (4) for the plunger (2);
a third branch (14) of said hydraulic system extending from said pumping means (9,10) to respective full-section chambers (16) of the secondary cylinder/piston assemblies (6) for the carrier (5);
a first valve device (12,13) associated with said first accumulator (11);
a second valve device (16,17) associated with said second accumulator (15);
an additional pump (25) for supplying oil to said first and second hydropneumatic accumulators (11 and 15);
a pressure transducer for the oil supplied to the plunger (2), said first and second valve devices (12,13 and 16,17) being linked operatively to said pressure transducer (29). - An extrusion press according to Claim 4, characterized in that said pumping means (9,10) comprise respective by-pass blocks (21,22) for the delivery flow to said first and third branches (8 and 14).
- An extrusion press according to Claim 5, characterized in that it comprises a third actuating hydropneumatic accumulator (23) provided with a respective hold-up solenoid valve (24) connected to respective full-section chambers (6c) of the secondary hydraulic cylinder/piston assemblies (6) for the carrier (5).
- An extrusion press according to Claim 6, characterized in that said first and second valve devices (12,13 and 16,17) respectively comprise a pilot solenoid valve (12 and 16) and a cartridge valve (13 and 17).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI912427A IT1251314B (en) | 1991-09-13 | 1991-09-13 | PRESS FOR EXTRUSION OF METALS IN GENERAL AND IN PARTICULAR OF ALUMINUM |
ITMI912427 | 1991-09-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0531612A1 EP0531612A1 (en) | 1993-03-17 |
EP0531612B1 true EP0531612B1 (en) | 1996-07-31 |
Family
ID=11360662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92106740A Expired - Lifetime EP0531612B1 (en) | 1991-09-13 | 1992-04-21 | Method for carrying out the ejection cycle of the air stored between die and billet in a billet extruding press |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0531612B1 (en) |
JP (1) | JPH05212435A (en) |
AT (1) | ATE140885T1 (en) |
DE (1) | DE69212549T2 (en) |
ES (1) | ES2090404T3 (en) |
IT (1) | IT1251314B (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2704783B1 (en) * | 1993-05-06 | 1995-07-28 | Clecim Sa | METHOD FOR METAL SPINNING AND IMPROVED SPINNING PRESS. |
US5445004A (en) * | 1993-11-24 | 1995-08-29 | Breda Danieli Extrusion | Extrusion method with gas evacuation, and extrusion press |
DE10006704B4 (en) * | 2000-02-15 | 2005-02-24 | Sms Eumuco Gmbh | Drive arrangement of a metal extrusion press |
JP2010144840A (en) * | 2008-12-19 | 2010-07-01 | Ube Machinery Corporation Ltd | Extrusion press |
JP5387716B2 (en) * | 2012-04-13 | 2014-01-15 | 宇部興産機械株式会社 | Extrusion press equipment |
DE102012009182A1 (en) * | 2012-05-10 | 2013-11-14 | Sms Meer Gmbh | Hydraulic extruder and method for operating a hydraulic extruder |
Family Cites Families (3)
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 (en) * | 1951-11-29 | 1958-10-02 | Reginald Victor Rowles | Hydraulic press, especially extrusion press, for metal processing |
GB1566617A (en) * | 1977-04-04 | 1980-05-08 | Davy Loewy Ltd | Extrusion press |
-
1991
- 1991-09-13 IT ITMI912427A patent/IT1251314B/en active IP Right Grant
-
1992
- 1992-04-21 AT AT92106740T patent/ATE140885T1/en not_active IP Right Cessation
- 1992-04-21 DE DE69212549T patent/DE69212549T2/en not_active Expired - Fee Related
- 1992-04-21 ES ES92106740T patent/ES2090404T3/en not_active Expired - Lifetime
- 1992-04-21 EP EP92106740A patent/EP0531612B1/en not_active Expired - Lifetime
- 1992-05-06 JP JP4113812A patent/JPH05212435A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
JPH05212435A (en) | 1993-08-24 |
ATE140885T1 (en) | 1996-08-15 |
ITMI912427A0 (en) | 1991-09-13 |
DE69212549T2 (en) | 1997-02-27 |
ES2090404T3 (en) | 1996-10-16 |
ITMI912427A1 (en) | 1993-03-14 |
IT1251314B (en) | 1995-05-08 |
EP0531612A1 (en) | 1993-03-17 |
DE69212549D1 (en) | 1996-09-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4924671A (en) | Controlled series high-pressure intensifiers for hydraulic press cylinded circuit | |
US3290919A (en) | High pressure hydraulic forming press | |
US4235088A (en) | Servohydraulic press with a closed loop control circuit and method of operating a fluid pressure operated press | |
US5460084A (en) | Method for controlling the drive of a hydraulic press | |
AU644691B2 (en) | Method and apparatus for starting a displacer engine hydraulically | |
US6558134B2 (en) | Fluid intensifier pump system | |
US8375765B2 (en) | Method and device for controlling the synchronization of cylinder/piston units and for reducing pressure peaks during forming and/or fineblanking on a fineblanking or stamping press | |
US20030167936A1 (en) | Controller for a hydraulic press and method for the operation thereof | |
GB2029747A (en) | Apparatus for fabricating spiral wrapped cartidge cases | |
US6370873B1 (en) | Hydraulic drive for a press | |
EP0531612B1 (en) | Method for carrying out the ejection cycle of the air stored between die and billet in a billet extruding press | |
KR101701016B1 (en) | Hydraulic extrusion press and method for operating a hydraulic extrusion press | |
CN111706559B (en) | Quick stamping hydraulic system | |
US5281007A (en) | Hydraulic actuation system for hydraulically powered parking brakes | |
US4307654A (en) | Filling and exhaust valve for the control of the hydraulic flow on presses and shears | |
US5551276A (en) | Upsetting press main drive | |
US4541241A (en) | Hydraulic driving arrangement for reciprocable masses or the like | |
US3157111A (en) | Work ejector for presses | |
US4439986A (en) | Hydraulic power unit | |
US2299686A (en) | Hydraulic press | |
US2751076A (en) | Extrusion press installation | |
JP2001252714A (en) | Driving device for metal extruding press | |
US2891564A (en) | Self-charging accumulator | |
US5979210A (en) | Drawing device for a press with control device for maintaining pressure during press stoppage | |
SU1435343A1 (en) | Hydraulic setting device for rolling mill |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES FR GB GR IT LI SE |
|
17P | Request for examination filed |
Effective date: 19930420 |
|
17Q | First examination report despatched |
Effective date: 19941005 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: INNSE INNOCENTI ENGINEERING S.P.A. |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: INNSE INNOCENTI ENGINEERING S.P.A. |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: INNSE INNOCENTI ENGINEERING SANTEUSTACCHIO S.P.A. |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE ES FR GB GR IT LI SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Effective date: 19960731 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19960731 Ref country code: AT Effective date: 19960731 Ref country code: BE Effective date: 19960731 Ref country code: CH Effective date: 19960731 |
|
REF | Corresponds to: |
Ref document number: 140885 Country of ref document: AT Date of ref document: 19960815 Kind code of ref document: T |
|
ITF | It: translation for a ep patent filed | ||
REF | Corresponds to: |
Ref document number: 69212549 Country of ref document: DE Date of ref document: 19960905 |
|
ET | Fr: translation filed | ||
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2090404 Country of ref document: ES Kind code of ref document: T3 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19961031 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2090404 Country of ref document: ES Kind code of ref document: T3 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PLBQ | Unpublished change to opponent data |
Free format text: ORIGINAL CODE: EPIDOS OPPO |
|
PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
PLBF | Reply of patent proprietor to notice(s) of opposition |
Free format text: ORIGINAL CODE: EPIDOS OBSO |
|
26 | Opposition filed |
Opponent name: OILGEAR TOWLER S.R.L Effective date: 19970429 |
|
PLBF | Reply of patent proprietor to notice(s) of opposition |
Free format text: ORIGINAL CODE: EPIDOS OBSO |
|
PLBF | Reply of patent proprietor to notice(s) of opposition |
Free format text: ORIGINAL CODE: EPIDOS OBSO |
|
PLBO | Opposition rejected |
Free format text: ORIGINAL CODE: EPIDOS REJO |
|
PLBN | Opposition rejected |
Free format text: ORIGINAL CODE: 0009273 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: OPPOSITION REJECTED |
|
27O | Opposition rejected |
Effective date: 19990430 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20020313 Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20020430 Year of fee payment: 11 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030421 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20030421 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20031231 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20080305 Year of fee payment: 17 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20080320 Year of fee payment: 17 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20080415 Year of fee payment: 17 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091103 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20090422 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090422 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090421 |