EP2243576B1 - Spritzgießform für Aluminiumteile in Reihe - Google Patents

Spritzgießform für Aluminiumteile in Reihe Download PDF

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Publication number
EP2243576B1
EP2243576B1 EP20090382053 EP09382053A EP2243576B1 EP 2243576 B1 EP2243576 B1 EP 2243576B1 EP 20090382053 EP20090382053 EP 20090382053 EP 09382053 A EP09382053 A EP 09382053A EP 2243576 B1 EP2243576 B1 EP 2243576B1
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EP
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Prior art keywords
movable part
intermediate part
movement
cavity
conduit
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EP20090382053
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English (en)
French (fr)
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EP2243576A1 (de
Inventor
Iñigo LOIZAGA URBISTONDO
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CIE Automotive SA
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CIE Automotive SA
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Priority to ES09382053.8T priority Critical patent/ES2471137T3/es
Priority to EP20090382053 priority patent/EP2243576B1/de
Publication of EP2243576A1 publication Critical patent/EP2243576A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/005—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure using two or more fixed moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/005—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of rolls, wheels or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
    • B22D17/10—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with horizontal press motion

Definitions

  • the invention is comprised within the field of injection molds for aluminum and specifically molds which allow obtaining several pieces simultaneously according to claim 1. Further specifications are claimed in dependent claims 2-4.
  • the mold is formed by two parts which, when they are connected, form a space which the cast aluminum fills.
  • the desired piece is obtained.
  • the two parts of the mold are securely seamed together in order to withstand, without separating, high pressures, which is achieved with the closing force of the injecting machine which must withstand the injection pressure multiplied by the projected area of the piece plus the feed system.
  • the two parts of the mold are unlocked and opened to extract the hot cast piece.
  • the mold can be simple, i.e., it can allow obtaining one piece in each working cycle, or it can be multiple, with several cavities to obtain several pieces in each working cycle.
  • Molds with several cavities for injecting aluminum pieces are normally complex and require a large investment.
  • the cavities are placed on the same plane, therefore the projected surface is proportional to the number of cavities and the mold size increases with the number of cavities.
  • the necessary closing force is multiplied with the closing number, a larger machine with a greater tonnage being necessary (with the subsequent increase in the investment).
  • the placement of movable carriages for obtaining complex geometries is hugely encumbered in multi-cavity molds due to the movement of the carriages of one cavity interfering with the other.
  • patent document US 4,589,840 describes a plastic injection mold formed by a fixed mold, a movable mold and an intermediate mold.
  • the injection nozzle is located in the fixed mold, and the plastic reaches each of the cavities through multiple feeding conduits, which cavities will form the pieces to be obtained.
  • the plastic is heated at high temperatures and branches out from the feeding conduit, connected to the injection nozzle, in order to fill each of the cavities.
  • WO-A-02/38311 discloses a pressure die-casting machine comprising, on a supporting frame fixed to the ground, a casting assembly associated with an injector assembly and with extraction elements.
  • the casting assembly has two coupled dies (16, 19) which have, during closure, aligned directions and opposite orientations, and are adapted to produce optionally two synchronized castings.
  • the two dies comprise a common intermediate complementary die portion adapted to form, on mutually opposite faces, the half-shells related to each one of the two dies, the intermediate complementary die being fixed to the supporting frame at least during a period of time that covers that of the casting operation.
  • the object of the invention is an injection mold for aluminum pieces as defined in claim 1, which can manufacture several pieces in line simultaneously.
  • the mold of the invention comprises:
  • the first plate comprises a first hole traversing the first cavity part and the third plate comprises a third hole traversing the third and fourth cavity parts.
  • the movable part has a protuberance which, in the coupling position, is partially housed in the first and third holes to define a feeding conduit communicating the first and second spaces, the injection means being configured to inject cast aluminum in the feeding conduit and in that the feeding conduit is dimensionally configured so that the cast aluminum completely fills the first and second spaces, such that the cast aluminum can solidify in the first and second spaces and inside the feeding conduit.
  • the first hole, the third hole, the injection conduit and the protuberance can be aligned in the coupling position.
  • the first piece and the second piece are obtained, connected through the solidified aluminum inside the feeding conduit.
  • the feeding conduit In order for the cast aluminum to completely fill the first and second spaces, it is necessary for the feeding conduit to be sized depending on the characteristics of the pieces to be obtained so as to allow the aluminum to flow quickly to the first and second spaces and to be able to completely fill said spaces before the aluminum starts to solidify.
  • the feeding conduit actually operates by holding the cast aluminum for enough time so as to completely fill the first and second spaces before the aluminum solidification process occurs.
  • the mold can comprise demolding means comprising movement means configured to separate the movable part with respect to the intermediate and fixed parts, such that between the movable part and the intermediate part there is a first separation distance which allows demolding the second piece and between the intermediate part and the fixed part, there is a second separation distance which allows demolding the first piece.
  • the movement means can comprise at least one tie rod configured to pull on the intermediate part, the mentioned tie rod comprising at one end at least a first stop, linked to the movable part, such that the movement of the movable part drags the tie rod until it reaches the first separation distance and in that the tie rod comprises a second stop which, once the first separation distance is reached, contacts with the intermediate part, such that the movement of the movable part drags the intermediate part, separating it from the fixed part.
  • the first separation distance will be enough so as to allow that, for example, robotized means can be moved into the space created and extract the second piece obtained.
  • the movement means can comprise at least one guide, and the guide can comprise a third stop configured to limit the second separation distance.
  • this second distance will be enough so as to allow demolding the first piece obtained and the length of the tie rod and the distance to the stop will be sized so as to make it possible to extract both pieces with manual or automatic means sequentially or simultaneously.
  • the mold is configured to separate the first piece from the second piece and from the solidified aluminum inside the feeding conduit in order to separate the pieces.
  • the first piece to be obtained is connected to the feeding conduit through a feeding branch.
  • the mentioned branch has a width and is connected to the feeding conduit at a sharp angle, such that when the movement means separate the movable part with respect to the intermediate and fixed parts the mentioned feeding branch fractures due to shear stress, thus being separated from the feeding conduit. Once separated from the solidified aluminum inside the feeding conduit, the branch is connected to the first piece.
  • the sharp angle formed between the feeding conduit and the branch allows that, when the movement means separate the movable part with respect to the intermediate and fixed parts, the mentioned feeding branch is fractured by shear stress, such that the first piece is separated from the feeding conduit which is dragged together with the second piece.
  • the mold comprises locking means for locking the intermediate part configured to limit the movement of the mentioned intermediate part at the start of the movement of the movable part.
  • These locking means can comprise a first step which is in the tie rod, a spring configured to push the mentioned first step against the intermediate part and a second step arranged in the tie rod and configured to contact with a third step of the movable part when the movement of the movable part reaches a distance which is equivalent to the width of the feeding branch.
  • the intermediate part exerts pressure on the tie rod in the area corresponding to the first step. At this time the cast aluminum is injected into the first and second spaces. Once the aluminum has solidified, the first piece and the second piece are connected through the solidified aluminum inside the feeding conduit.
  • the movement means separate the movable part with respect to the intermediate and fixed parts
  • the solidified aluminum inside the feeding conduit is sheared.
  • the spring presses against the intermediate part for the purpose of keeping it connected to the fixed part during the movement of the movable part and thus being able to fracture the solidified aluminum.
  • the movable part is moved, i.e., it is separated with respect to the intermediate part a distance which is equivalent to the width n of the branch. With this small movement the solidified aluminum inside the feeding conduit is fractured and the first piece is thus separated from the second piece and from the solidified aluminum.
  • the mold can comprise connecting means configured to lock the fixed part, the movable part and the intermediate part when the cast aluminum is injected.
  • the connecting means can comprise a locking element which moves in a direction perpendicular to the movement of the movable part, comprising a protuberance fitting in a housing of the intermediate part.
  • the protuberance is inserted in the housing of the intermediate part in the coupling position such that the parts are locked.
  • the mold comprises a movable part (2), a fixed part (1) and an intermediate part (3).
  • the fixed part (1) comprises a first plate (11) in turn comprising a first hole (111) traversing a first cavity part (12).
  • the intermediate part (3) comprises a third plate (31) in turn comprising a third hole (311) traversing a third cavity part (32) and a fourth cavity part (33).
  • the movable part (2) comprises a second plate (21) having a protuberance (23), which can be partially housed in the first hole (111) and third hole (311) to define a feeding conduit (7).
  • Figure 5 shows the feeding conduit (7) which is connected to a first space and to a second space through feeding branches (9, 9'), respectively.
  • the first space is defined by the first cavity part (12) and the third cavity part (32) corresponding with the geometry of a first piece (A), whereas the second space is defined between the fourth cavity part (33) and the second cavity part (22) corresponding with the geometry of a second piece (B).
  • the cast aluminum is injected into these two spaces to form the pieces (A) and (B), which will be connected through the solidified aluminum in the feeding conduit (7).
  • the feeding conduit (7) has to be dimensionally configured so that the cast aluminum completely fills the first and second spaces, such that the cast aluminum can solidify in the first and second spaces and inside the feeding conduit (7).
  • the mold can comprise a first feeding branch (9) which is connected to the first space and a second branch (9') connected to the second space.
  • the first branch (9) can also be connected to the feeding conduit (7) at a sharp angle, such that once the aluminum is injected, the first piece (A) is connected to the solidified aluminum inside the feeding conduit (7) through the solidified aluminum inside the branch (9).
  • Figure 2 shows the movable part (2), the intermediate part (3) and the fixed part (1) coupled together to cause the cast aluminum to be injected through an injection conduit (4).
  • the pressure which the mold must withstand at the time of the injection is very great, therefore the mold can comprise connecting means which allow keeping the intermediate part (3), fixed part (1) and movable part (2) locked in the coupling position.
  • these connecting means can comprise a locking element (16) having a boss (17) which is fitted in a housing (18) of the intermediate part (3).
  • the aluminum is injected through the injection conduit (4) which can be aligned with the feeding conduit (7), such that the aluminum flows from the injection conduit (4), completely filling the first and second spaces through the feeding conduit (7).
  • Figure 1 shows this demolding position, in which the parts have been separated, i.e., the movable part (2) separated with respect to the intermediate part (3) and fixed part (1), and the intermediate part (3) separated with respect to the fixed part (1).
  • the movable part (2) is separated from the intermediate part (3) a first separation distance, which is a distance that is suitable so as to allow demolding the second piece (B), whereas the intermediate part (3) is separated from the fixed part (1) a second separation distance, which is the distance suitable so as to allow demolding the first piece (A).
  • these pieces (A) and (B) are connected by the solidified aluminum inside the feeding conduit (7), therefore in order to demold the pieces (A) and (B), it is necessary to separate them.
  • the mold is configured to separate the first piece (A) from the second piece (B) and from the solidified aluminum inside the feeding conduit (7).
  • the first piece (A) is be connected to the feeding conduit (7) through the feeding branch (9) which is connected, at a sharp angle, to the mentioned feeding conduit (7).
  • This branch (9) has a width and is configured so that when movement means, not depicted in the figures, separate the movable part (2) with respect to the intermediate part (3) and fixed part (1), the mentioned feeding branch (9) fractures due to shear stress. In other words, when the movable part (2) is separated from the intermediate part (3) the feeding branch (9) fractures due to shear stress, being separated from the solidified aluminum inside the feeding conduit (7).
  • the first piece (A) is separated from the solidified aluminum inside the feeding conduit (7), which is dragged together with the second piece.
  • the demolding is carried out, what is obtained is the first piece (A) together with the solidified aluminum in the branch (9), and on the other hand, the second piece is obtained together with the solidified aluminum inside the branch (9') and the solidified aluminum inside the feeding conduit (7).
  • the mold comprises locking means for locking the intermediate part (3) configured to limit the movement of the mentioned part (3) at the start of the movement of the movable part (2), for the purpose of keeping the intermediate part (3) connected to the fixed part (1).
  • these locking means can comprise a first step (8) arranged in a tie rod (5), a spring (13) configured to push the mentioned step (8) against the intermediate part (3) and a second step (14) arranged in the tie rod (5) which contacts with a third step (15) of the movable part (2) when the movement of the movable part (2) reaches a distance which is equivalent to the width of the feeding branch (9).
  • coupling means In the phase for the injection of the aluminum in the first and second spaces through feeding conduit (7), coupling means, not depicted in the figures, couple the movable part (2), intermediate part (3) and fixed part (1), such that the spring (13) is compressed and the second step (14) is not in contact with the step (15) of the movable part (2).
  • the movement means start to separate the movable part (2) with respect to the intermediate part (3), the spring (13) pushes the first step (8) against the intermediate part (3) so that said part (3) is connected to the fixed part (1) and, the second step (14) contacts with the third step (15) of the movable part (2).
  • This movement covers a distance which is equivalent to the width of the feeding branch (9).
  • the first piece (A) is already separated from the solidified aluminum inside the feeding conduit (7) and from the second piece (B).
  • the movement means continue to separate the movable part (2) from the intermediate part (3) until reaching the first separation distance.
  • the first separation distance is reached when a second stop (52) of the tie rod (5) contacts with the intermediate part (3).
  • the second stop (52) can collide, for example, with a boss arranged in the intermediate part (3) such that the movable part (2) drags the intermediate part (3), separating it with respect to the fixed part (1).
  • Figure 3 shows how the movable part (2) has reached the first separation distance.
  • the pieces (A) and (B) have been separated and the piece to be demolded is a piece formed by the second piece (B) and the solidified aluminum inside the feeding conduit (7).
  • the second stop (52) has collided with the boss of the intermediate part (2).
  • the intermediate part (3) is dragged to be separated with respect to the fixed part (1).
  • the second separation distance is reached when a third stop (61) of guides (6) collides with the intermediate part (3). This position is shown in Figure 4 . Once the second separation distance has been reached, the first piece (A) can be demolded.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (4)

  1. Spritzgiessform für Aluminiumteile die aufweist:
    - einen feststehenden Teil (1) mit einer ersten Platte (11) aufweisend eine erste Teilkavität (12),
    - einen beweglichen Teil (2) mit einer zweiten Platte (21) aufweisend eine zweite Teilkavität (22),
    - zumindest ein Zwischenteil (3) mit einer dritten Platte (31) aufweisend eine dritte Teilkavität (32) und eine vierte Teilkavität (33)
    - Kopplungsmittel, die so gestaltet sind, dass der bewegliche Teil (2), der feststehende Teil (1) und der Zwischenteil (3) eine Kopplungsposition einnehmen können, sodass zwischen der ersten Teilkavität (12) und der dritten Teilkavität (32) ein erster Raumbereich definiert ist, welcher mit der Geometrie von zumindest einem erhaltbaren ersten Teil (A) übereinstimmt und zwischen der zweiten Teilkavität (22) und der vierten Teilkavität (33) ein zweiter Raumbereich definiert ist, welcher mit der Geometrie von zumindest einem erhaltbaren zweiten Teil (B) übereinstimmt,
    - Einspritzmittel zum Einspritzen von Gussaluminium in den ersten und den zweiten
    Raumbereich durch einen Spritzkanal (4),
    wobei
    - die erste Platte (11) eine erste Bohrung (111) aufweist, welche die erste Teilkavität (12) durchsetzt und die dritte Platte (31) eine dritte Bohrung (311) aufweist, welche die erste und die vierte Teilkavität (32) durchsetzt;
    - der bewegliche Teil (2) einen Vorsprung (23) aufweist, welcher in der Kopplungsposition teilweise in der ersten und der dritten Bohrung (111,311) angeordnet ist, um einen Zuführkanal (7) zu definieren, der den ersten und den zweiten Raumbereich verbindet, wobei die Einspritzmittel derart ausgebildet sind, dass sie Gussaluminium in den Zuführkanal (7) einspritzen, und der Zuführkanal (7) so dimensioniert ist, dass das Gussaluminium den ersten und den zweiten Raumbereich vollständig ausfüllt, so dass das Gussaluminium im ersten und zweiten Raumbereich und im Zuführkanal (7) erstarren kann;
    - der erste Raumbereich mit dem Zuführkanal (7) über einen Zuführzweig (9) verbunden ist, der mit dem Zuführkanal (7) über einen spitzen Winkel verbunden ist und der Zuführzweig (9) eine Breite aufweist; und
    - die Spritzgiessform weiterhin Schließmittel zum Fixieren des Zwischenteils (3) aufweist, die so gestaltet sind, dass sie bei Beginn der Bewegung des beweglichen Teils (2) die Bewegung des Zwischenteils (3) begrenzen, und Bewegungsmittel aufweist, um das beweglichen Teil (2) von dem Zwischenteil (3) und dem festen Teil (1) zu trennen;
    - die Spritzgiessform Entformungsmittel aufweist, welche die Bewegungsmittel enthalten, um das bewegliche Teil (2) von dem Zwischenteil (3) und dem festen Teil (1) zu trennen, derart, dass zwischen dem Zwischenteil (3) und dem festen Teil (1) ein erster Abstand gebildet wird, welcher die Entformung des zweiten Teils (B) erlaubt und zwischen dem Zwischenteil (3) und dem festen Teil (1) ein zweiter Abstand gebildet wird, welcher die Entformung des ersten Teils (A) erlaubt, dadurch gekennzeichnet,
    - dass die Bewegungsmittel zumindest eine Zugstange (5) aufweist, die dazu vorgesehen ist, um an dem Zwischenteil (3) zu ziehen, wobei die Zugstange (5) an einem Ende einen ersten Anschlag (51) aufweist, der mit dem beweglichen Teil (2) derart verbunden ist, , dass eine Bewegung des beweglichen Teils (2) die Zugstange (5) soweit zieht, bis der erste Abstand erreicht ist, und
    - dass die Zugstange (5) zumindest einen zweiten Anschlag (52) aufweist, welcher am Zwischenteil (3) anschlägt, derart, dass das bewegliche Teil das Zwischenteil (3) zieht und es vom festen Teil (1) trennt, und
    - dass die Schließmittel zum Fixieren des Zwischenteils (3) aufweisen:
    - eine an der Zugstange (5) angeordnete erste Stufe (8), ,
    - eine Feder (13), um die erste Stufe (8) gegen das Zwischenteil (3) zu drücken,
    - eine an der Zugstange (5) angeordnete zweite Stufe (14), die so ausgebildet ist, dass sie mit einer dritten Stufe (15) des beweglichen Teils (2) in Kontakt kommt, wenn die Bewegung des beweglichen Teils (2) einen Abstand erreicht, welcher der Breite des Zuführzweigs (9) entspricht.
  2. Spritzgiessform für Aluminiumteile nach Anspruch 1, dadurch gekennzeichnet, dass in der Kopplungsposition die erste Bohrung (111), die dritte Bohrung (311), der Zuführkanal (4) und der Vorsprung (23) miteinander fluchten.
  3. Spritzgiessform für Aluminiumteile nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass die Bewegungsmittel zumindest eine Führung (6) aufweisen, die geeignet ist, die Bewegung des Zwischenteils (3) zu führen, und dass die Führung (6) zumindest einen dritten Anschlag (61) aufweist, welcher den zweiten Abstand begrenzt.
  4. Spritzgiessform für Aluminiumteile nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass die Spritzgiessform Verbindungsmittel aufweist, die geeignet sind, das feste Teil (1), das bewegliche Teil (2) und das Zwischenteil (3) zu spannen, wenn das Gussaluminium eingespritzt wird, wobei die Verbindungsmittel aufweisen:
    - ein Spannelement (16), welches in einer Richtung senkrecht zur Bewegung des beweglichen Teils (2) bewegt wird, und einen Vorsprung (17) aufweist, welcher in eine Aufnahme (18) des Zwischenteils (3) passt,
    - eine Stange (1), die Bestandteil des beweglichen Teils (2) ist und durch einen schrägen Kanal des Spannelements (16) derart beweglich ist, dass wenn die Bewegungsmittel das bewegliche Teil (2) vom Zwischenteil (3) und vom festen Teil (1) trennen, die Stange (19) durch den schrägen Kanal gleitet, wodurch das Spannelement (16) außer Position gelangt.
EP20090382053 2009-04-23 2009-04-23 Spritzgießform für Aluminiumteile in Reihe Active EP2243576B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES09382053.8T ES2471137T3 (es) 2009-04-23 2009-04-23 Molde de inyección de piezas de aluminio en línea
EP20090382053 EP2243576B1 (de) 2009-04-23 2009-04-23 Spritzgießform für Aluminiumteile in Reihe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20090382053 EP2243576B1 (de) 2009-04-23 2009-04-23 Spritzgießform für Aluminiumteile in Reihe

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Publication Number Publication Date
EP2243576A1 EP2243576A1 (de) 2010-10-27
EP2243576B1 true EP2243576B1 (de) 2014-05-21

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CN117961025B (zh) * 2024-03-28 2024-06-11 兴化市永泰新材料有限公司 一种汽车零件压铸机

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Publication number Priority date Publication date Assignee Title
US4589840A (en) 1985-03-18 1986-05-20 Husky Injection Molding Systems Ltd. Apparatus and method for removing molded articles in uniform orientation
AU6205098A (en) 1997-02-25 1998-09-18 Jes Tougaard Gram Procedure and machine for multi component moulding
IT1317380B1 (it) 2000-11-10 2003-06-16 Idra Presse S P A Struttura di macchina per pressofusione.

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ES2471137T3 (es) 2014-06-25

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