EP0636431A1 - Strangpresse für Nichteisenlegierungen - Google Patents

Strangpresse für Nichteisenlegierungen Download PDF

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Publication number
EP0636431A1
EP0636431A1 EP94111820A EP94111820A EP0636431A1 EP 0636431 A1 EP0636431 A1 EP 0636431A1 EP 94111820 A EP94111820 A EP 94111820A EP 94111820 A EP94111820 A EP 94111820A EP 0636431 A1 EP0636431 A1 EP 0636431A1
Authority
EP
European Patent Office
Prior art keywords
presser
extrusion head
mandrel
main piston
support
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.)
Withdrawn
Application number
EP94111820A
Other languages
English (en)
French (fr)
Inventor
Attilio Ticozzi
Valerio Presezzi
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.)
BRUNO PRESEZZI EXTRUSION Srl
Original Assignee
BRUNO PRESEZZI EXTRUSION Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BRUNO PRESEZZI EXTRUSION Srl filed Critical BRUNO PRESEZZI EXTRUSION Srl
Publication of EP0636431A1 publication Critical patent/EP0636431A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES 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

Definitions

  • the present invention relates to an improved press for extruding nonferrous alloys, which features a reduced stroke.
  • Presses are known for extruding nonferrous alloys, such as for example aluminum-based light alloys, to form profiles that can be used to manufacture fixed and moving frames for door- and window-frames or other uses; said presses generally comprise a presser element one end whereof faces an extrusion head in which the die for obtaining the desired shape of the extruded element is arranged.
  • the presser element is usually constituted by a hydraulic cylinder inside which a piston can slide; one end of said piston protrudes from the body of the cylinder on the side directed towards the extrusion head.
  • a presser mandrel is associated with said end of the piston and, by actuating the hydraulic cylinder, acts on a billet of material to be extruded, pushing it through the extrusion head and thus performing the actual extrusion.
  • the extrusion head has, upstream of the die, a container for the billet of material to be extruded which can move with respect to the die along the extrusion direction so as to allow the passage, between the container and the die, of a blade for cutting the tailing that remains inside the container at the end of the extrusion operation.
  • the presser mandrel must perform a considerable stroke, since it must protrude from the container and must move away therefrom along the extrusion direction, which is opposite to the advancement direction, thereby allowing the placement of a new billet to be extruded between the container and the end of the presser mandrel that is directed towards the extrusion head. Due to the considerable stroke of the mandrel in this step, in conventional presses there are long downtimes that significantly penalize the productive potential of these machines.
  • presses have been designed wherein the presser mandrel can be moved away laterally, while the billet to be extruded is loaded automatically inside the container of the extrusion head.
  • carousel devices that automatically replace the presser mandrel and insert a new billet to be extruded inside the container of the extrusion head at the end of each extrusion cycle.
  • a principal aim of the present invention is to solve the above described problems by providing a press for extruding nonferrous alloys whose downtimes are reduced even further with respect to conventional pressers, consequently obtaining an increase in productivity.
  • an object of the invention is to provide a press that is structurally simpler than presses that perform a lateral movement or replace the presser mandrel.
  • Another object of the invention is to provide a press that is free from problems in alignment between the presser mandrel and the extrusion head.
  • Another object of the invention is to provide a press that is highly reliable in operation.
  • a press for extruding nonferrous alloys which comprises a presser element having, at one of its ends, a presser mandrel which faces an extrusion head, said presser element being movable by command towards or away from said extrusion head to extrude, through said extrusion head, a billet of material which is interposed between said presser mandrel and said extrusion head, characterized in that a seat for accommodating said presser mandrel is provided in said presser element starting from its end directed towards said extrusion head, and in that said presser mandrel can move with respect to said presser element to be at least partially accommodated inside said presser element during the movement of said presser element away from said extrusion head.
  • the press 1 comprises a presser element 2 which faces, with one of its ends, an extrusion head 3 and can move by command towards or away from the extrusion head 3.
  • the extrusion head 3 comprises, in a per se known manner, an extrusion die 4 and a container 5 which faces the die 4 on the side directed towards the presser element 2 and is axially crossed by a passage 6.
  • the container 5 can be moved away from the die 4 in a per se known manner so as to allow the passage, between the extrusion die 4 and the container 5, of a blade 7 for cutting the tailing 9a at the end of the extrusion step, as will become apparent hereinafter.
  • the presser element 2 has, at its end directed towards the extrusion head 3, a presser mandrel 8 which, by means of the movement of the presser element 2, can be inserted into the passage 6 so as to transfer into said passage 6 a billet 9 of material to be extruded and so as to then extrude it through the die 4.
  • a seat 10 for accommodating the presser mandrel 8 is formed in the presser element 2, starting from its end directed towards the extrusion head 3; said mandrel can move by command with respect to the presser element in order to be at least partially accommodated inside the presser element 2 during the spacing of the presser element from the extrusion head 3.
  • the presser element 2 substantially comprises the main piston 11 of a hydraulic cylinder 12 which is arranged coaxially to the passage 6.
  • the piston 11 is slidingly accommodated in a sliding chamber 13 formed coaxially inside the body of the cylinder 12 and protrudes from said chamber with a longitudinal end on the side directed towards the extrusion head 3.
  • the back end of the sliding chamber 13, i.e. the side of said chamber lying opposite with respect to the extrusion head 3, is connected to an opening 14 through which the pressurized liquid that moves the piston 11 along the sliding chamber towards the extrusion head 3 is introduced into the chamber 13.
  • the return of the cylinder 11 inside the sliding chamber 13 is obtained by means of at least one auxiliary double-action hydraulic cylinder 15 whose body is connected to the body of the cylinder 12; said hydraulic cylinder is arranged so that its axis is parallel to the axis 12a of the cylinder 12.
  • the auxiliary cylinder 15 internally accommodates a piston 16 which has a stem 17 protruding from the end of the cylinder 15 which is directed towards the extrusion head 3 and is connected to an end block 18 of the piston 11.
  • the presser mandrel 8 is mounted on a support 19 which is shaped like a piston of a double-action hydraulic cylinder. More particularly, the seat 10 that slidingly and loosely accommodates the support 19 is formed coaxially inside the end block 18 and the remaining part of the piston 11.
  • a protrusion 30 extends from the bottom of the seat 10, is rigidly coupled to the piston 11, and is arranged coaxially to said piston.
  • Said protrusion 30 has, at its free end, a cylindrical expansion 31 which slidingly couples to a cylindrical chamber 32 formed coaxially inside the support 19 starting from its end that lies opposite to the presser mandrel 8.
  • the support 19 forms the piston of a hydraulic actuator provided with an internal cylinder, wherein said internal cylinder is constituted by the protrusion 30.
  • the cylindrical expansion 31 divides the cylindrical chamber 32 into two half-chambers which can be selectively connected to the delivery or the discharge of a hydraulic circuit through ducts 33 and 34 which run inside the piston 11 so as to cause the sliding of the support 19 along the seat 10.
  • Said locking means are constituted by wedges 20 which are slidingly supported by the end block 18 of the piston 11 and can move by command transversely with respect to the axis 12a for example by means of double-action hydraulic cylinders 21.
  • Seats 22 are formed in the support 19 and are aligned with the wedges 20 when the presser mandrel 8 is in the position in which it is fully extracted from the piston 11, so that the actuation of the wedges 20 towards the axis 12a moves said wedges to engage within the seats 22, locking the axial translatory motion of the support 19 and thus of the presser mandrel 8 with respect to the piston 11.
  • the main piston 11 is fully retracted inside the body of the hydraulic cylinder 12, and likewise the support 19 is fully retracted inside the main piston 11.
  • the presser mandrel 8 lies substantially completely inside the piston 11 so that between the end block 18 of the piston 11 and the container 5 there is a space that allows to place a billet 9 to be extruded so that it is axially aligned with the piston 11 and with the container 5 (figure 1).
  • the support 19 is actuated in the direction of the extrusion head, so that the presser mandrel 8 pushes the billet 9 of material to be extruded into the passage 6 inside the container 5 (figure 2).
  • the seats 22 are aligned with the wedges 20 which, by actuating the hydraulic cylinders 21, are made to engage the seats 22, locking the support 19 with respect to the piston 11.
  • the container 5 is then moved into contact with the extrusion die 4 (figure 3), while the hydraulic cylinder 12 is actuated, moving the piston 11 towards the extrusion head 3 and extruding the billet 9 through the extrusion die 4 (figure 4).
  • the piston 11 and, simultaneously, the support 19 are actuated in the opposite direction (figure 5), after disengaging the wedges 20 from the seats 22, so that while the piston 11 retracts inside the body of the cylinder 12 the support 19 also retracts inside the piston 11.
  • the stroke required by the main piston to restore the space between the end block 18 and the container 5 is significantly reduced, said space being necessary for positioning a new billet of material 9 to be extruded, and the downtimes of the operating cycle of the press are consequently reduced considerably.
  • the container 5 is spaced from the extrusion die 4 and the blade 7 cuts the residual tailing 9a.
  • the materials employed, as well as the dimensions, may be any according to the requirements and the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
EP94111820A 1993-07-30 1994-07-27 Strangpresse für Nichteisenlegierungen Withdrawn EP0636431A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI931745 1993-07-30
IT93MI001745A IT1266585B1 (it) 1993-07-30 1993-07-30 Pressa per l'estrusione di leghe non ferrose a corsa ridotta

Publications (1)

Publication Number Publication Date
EP0636431A1 true EP0636431A1 (de) 1995-02-01

Family

ID=11366758

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94111820A Withdrawn EP0636431A1 (de) 1993-07-30 1994-07-27 Strangpresse für Nichteisenlegierungen

Country Status (2)

Country Link
EP (1) EP0636431A1 (de)
IT (1) IT1266585B1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136421A (en) * 1961-07-03 1964-06-09 Thomas E Hutch Extrusion press
FR1534237A (fr) * 1967-08-11 1968-07-26 Schloemann Ag Presse à filer, notamment les barres et les tubes
FR2154971A5 (en) * 1971-10-01 1973-05-18 Morane Somua Presses Mat Direct method drawing presses - with simplified charging and shortened drive element work path

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136421A (en) * 1961-07-03 1964-06-09 Thomas E Hutch Extrusion press
FR1534237A (fr) * 1967-08-11 1968-07-26 Schloemann Ag Presse à filer, notamment les barres et les tubes
FR2154971A5 (en) * 1971-10-01 1973-05-18 Morane Somua Presses Mat Direct method drawing presses - with simplified charging and shortened drive element work path

Also Published As

Publication number Publication date
ITMI931745A0 (it) 1993-07-30
IT1266585B1 (it) 1997-01-09
ITMI931745A1 (it) 1995-01-30

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