EP2554296A2 - Piston de coulée sous pression - Google Patents

Piston de coulée sous pression Download PDF

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Publication number
EP2554296A2
EP2554296A2 EP12176775A EP12176775A EP2554296A2 EP 2554296 A2 EP2554296 A2 EP 2554296A2 EP 12176775 A EP12176775 A EP 12176775A EP 12176775 A EP12176775 A EP 12176775A EP 2554296 A2 EP2554296 A2 EP 2554296A2
Authority
EP
European Patent Office
Prior art keywords
piston head
die
wear ring
cast
ring
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
EP12176775A
Other languages
German (de)
English (en)
Other versions
EP2554296B1 (fr
EP2554296A3 (fr
Inventor
Werner Bochmann
Jürgen Barz
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.)
Schmelzmetall AG
Original Assignee
Schmelzmetall AG
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 Schmelzmetall AG filed Critical Schmelzmetall AG
Publication of EP2554296A2 publication Critical patent/EP2554296A2/fr
Publication of EP2554296A3 publication Critical patent/EP2554296A3/fr
Application granted granted Critical
Publication of EP2554296B1 publication Critical patent/EP2554296B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/203—Injection pistons

Definitions

  • the present invention relates to a die-cast piston head for light metal die-casting, comprising a one-piece piston head made of copper or a copper alloy and at least one arranged on this closed wear ring made of a harder material than that of the piston head, wherein the wear ring in the region between an end face and a lateral surface of the Plunger head is arranged and wherein the piston head and the wear ring have mutually complementary connection means.
  • Die-cast pistons for light metal diecasting usually consist of at least one piston head and one driven piston rod. These components slide wall guided in a filling chamber.
  • the die-cast piston conveys the light metal melt entering the fill chamber for a shot via the gate system into the cavity of the die where the die casting is cast.
  • the die-cast piston head comes with its front face with the molten metals or alloys in contact.
  • Die-cast iron piston heads made of copper or a copper alloy have a high thermal conductivity and dissipate the heat of the applied at the piston end melt during solidification so quickly that the cycle times of the die-casting are not increased, and so slow that a successful Nachpressphase is possible.
  • the heat balance of Druckgusskolbenkexcellent is therefore of great importance for die casting quality and economy.
  • Copper or copper alloy die-cast piston heads are relatively soft and thus prone to premature wear. Therefore, they are provided with wear protection rings made of steel, Stellite or other hard materials or are made entirely of steel. The wear protection rings become new after their wear replaced. Due to the mechanical and thermal loading of the piston heads and the requirement of (partial) replacement, which can be accomplished only consuming with special tools, the attachment of wear protection rings on the piston head of particular importance for the handling of the die-cast piston in everyday operations.
  • a closed sealing ring which is arranged between a first and a releasably connected thereto second piston head part supported by this.
  • This sealing ring consists, viewed from the piston end side, of an axially rear first piston part and an axially front second piston part, wherein a first and / or the second piston part at least partially axially overlapping sealing ring is provided.
  • the first piston part is a bush made of a thermally conductive copper alloy
  • the second consists of a hot-work steel or a copper alloy with a long service life and the sealing ring is designed as non-slotted or radially resilient slotted wear ring made of steel or copper.
  • First and second piston part are releasably connected to each other by means of circumferentially distributed axially arranged screws, the sealing ring is detachably snapped.
  • the US 4,886,107 A discloses a die-cast piston head made of copper having a wear-resistant steel ring in a groove at its front end. This split steel ring is spread apart for mounting, pushed over the die-cast bulb tip, and then secured against axial expansion by soldering its ends together in the position.
  • the DE 203 09 181 U1 proposes a piston head which, viewed from the piston end side, consists of an axially rear first piston part and an axially front second piston part, wherein a first and / or the second piston part at least partially axially overlapping sealing ring is provided.
  • the first piston part is a sleeve of thermally conductive copper alloy
  • the second consists of hot-work steel or a copper alloy
  • the sealing ring is designed as non-slotted or radially resilient slotted wear ring made of steel or copper.
  • First and second piston part are releasably connected to each other by means of circumferentially distributed axially arranged screws, the sealing ring is detachably snapped.
  • This document proposes for applications in the high-vacuum casting technique to provide a second, axially rear sealing ring, which is formed by means of springs outside the filling chamber to an excess radially auffahrend and which leads the die-cast piston within the casting cylinder.
  • a one-piece piston head on which a wear protection ring is screwed.
  • the wear protection ring has in its frontal region an axial section with a Plurality of axial passage slots.
  • the melt-facing region In this front, it also has a conically inwardly extending, radially inner surface.
  • the piston head has a spherical re-entrant surface, so that the two surfaces enclose between them an annular gap whose opening cross-section at the immediate end side is maximum and decreases axially rearwardly to zero.
  • the contact point of the two surfaces is axially seen before the threaded portion and radially narrower than the thread. This annular gap, together with the axial slots to ensure the penetration of melt and thus the expansion of the wear protection ring, whereby the piston head to be sealed against the chamber wall.
  • the applicant is the EP 0 525 229 A1 considered.
  • a die-cast piston is disclosed, the piston head is formed in one piece and also has a sealing ring.
  • the sealing ring is detachably supported via a circumferential groove on a circumferential spring arranged on the piston head.
  • the piston head has a chamfer along the circumference of its end face. The joint between the piston head and sealing ring adjoins it without gaps.
  • the melt preferably penetrates into the annular gap between the sealing ring and Golfinnenwand, a so-called bullet, and in the joint between the piston head and sealing ring, wherein at the joint, the chamfer of the piston head acts as a guide surface, the molten metal or the alloy passes directly to the joint.
  • a disadvantage of this prior art is that at a shoot through the molten metal or alloy, the piston head is damaged and the wear ring from the piston head no longer destructive is solvable, whereby maintenance of Druckgusskolbenkopfes considerably more difficult or impossible.
  • the invention proposes a die-cast piston head of the type mentioned above, wherein the wear ring has a radially inwardly directed web on its face facing the radially inwardly directed edge.
  • This web forms a barrier to protect the connecting means located in the joint between the piston head and the wearing ring against the penetration of the molten metal.
  • the metal solidifies near the end of the face and thus can not penetrate as far as the connecting devices. At the same time it closes the joint.
  • the connection devices therefore remain fully functional, whereby the connection between the piston head and the wear ring remains stable and the die-cast piston head can be used for a number of working cycles which are increased compared with the prior art.
  • the one-piece nature of the wear protection ring and its closure require a particularly long service life.
  • the wear protection ring according to the invention has no axial or radial slots, it is therefore not prone to penetrating melt.
  • the wear ring consists of a hot-work tool steel, its alloy consisting of iron, carbon, silicon, chromium, molybdenum and vanadium is characterized by a hardness substantially exceeding the hardness of the piston head, which is sufficient to protect the piston head effectively from mechanical loads and to allow an economically acceptable service life of the piston head.
  • the thermal expansion coefficient of the wear ring alloy is less than the thermal expansion coefficient of the piston head alloy.
  • the thermal conductivity of the wear ring alloy is also lower than the thermal conductivity of the piston head alloy. It has been found that a wear ring made of hot-work steel despite the mentioned differences in operation does not have a much higher temperature than the piston head.
  • the connecting means are designed as a spring arranged on the piston head and a groove arranged on the wear ring.
  • This rotationally symmetrical and thus easy to implement in construction and manufacturing connection devices allow easy handling of the die-cast piston head, since it is composed of only two one-piece components, namely from the piston head and the wear ring.
  • both components are pushed together until the spring skips the front side facing away from the boundary of the groove and engages in the groove.
  • the spring have a low height and the groove accordingly a small depth. In an assembled state, the spring between the two boundaries of the groove, that is arranged in the groove.
  • the spring on its side facing the radially outwardly facing edge has a radial transition and / or the wear ring on its side facing away from the end, radially inwardly directed edge has a radial transition.
  • the assembly simplifies, as when pushing together of the piston head and wear ring, the radial transitions meet as two sliding surfaces and significantly reduce the force required to skip the spring.
  • the spring on its side facing away from the front, radially outwardly directed edge and the groove are not rounded, so that an unintentional disengagement of the wear ring is effectively prevented.
  • the radial transitions are formed as chamfers.
  • the connecting means are designed as two mutually engageable threads, in particular metric fine thread.
  • the wear ring is thus formed screwed to the piston head.
  • the connecting means are designed as a spring arranged on the piston head and a groove arranged on the wear ring and two threads which can be brought into engagement, in particular metric fine threads.
  • the threads serve as mounting means, as during the screwing of the wear ring with the piston head, the feed generated thereby in the axial direction, the groove effectively and metered push over the spring.
  • the threads and the tongue and groove combination ensure redundant and permanent retention of the wear ring on the piston head.
  • the wear ring is secured in the assembled state against rotation relative to the piston head, since a rotational movement due to the thread pitch always implies an axial movement, but this is prevented by the latched spring.
  • the piston head consists of an essentially copper, nickel, chromium and silicon-containing alloy or of an essentially copper, cobalt, nickel and beryllium-containing alloy.
  • Such alloys are highly thermally conductive and can be made wear-resistant.
  • further copper alloys with the above properties are conceivable for the piston head according to the invention.
  • the invention provides that the wear ring has a hardness according to the Rockwell scale C greater than 50, but at least has a significantly higher hardness than the piston head.
  • the compared to the copper-based piston head significantly harder wear ring is used to protect the softer piston head from mechanical wear due to a possible tilting when advancing the Druckgusskolbenkopfes in the filling chamber and against thermal damage by fürschpatende melt.
  • the wear ring consists of a substantially copper and beryllium-containing alloy and its outer diameter corresponds to the outer diameter of the piston head. It is particularly advantageous that the wear ring and the piston head extend approximately equally thermally. The considerations to be made for steel wear rings thermal expansion omitted. Due to this material similarity between wear ring and piston head, the respective outer diameters are consistent for all relevant temperatures in practice. By the use of special copper alloys, in particular of copper alloys of the applicant, in the manufacture can be sufficiently hard and resistant wear rings form, without using steel.
  • the two threads are formed in the operating state cohesively with each other.
  • a fixation of the thread is achieved with advantage, which can not solve even under the harsh operating conditions.
  • Fig. 1 is a schematic cross section of a die-cast piston according to the invention for the light metal die-casting along its cylinder axis 11 in a first embodiment shown.
  • This die-cast piston head has a one-piece piston head 1 made of a copper alloy and a wear ring 2 made of hot-work steel arranged on the piston head.
  • the wear ring it would also be conceivable for the wear ring to be made of a copper-beryllium alloy consists.
  • the wear ring 2 is arranged in the region between the end face 3 and the lateral surface 4 of the piston head 1.
  • the piston head 1 As mutually complementary connection means, the piston head 1, a spring 6 and the wear ring 2, a groove 7.
  • the spring 6 and / or the groove 7 may be interrupted one or more times along its circumference. These interruptions make the spring 6 and / or the groove 7 less rigid, so that only reduced forces are required when mounting the wear ring 2 on the piston head 1.
  • the groove 7 may also be arranged on the piston head 1 and the spring 6 on the wear ring 2 accordingly.
  • the wear ring 2 has a radially inwardly directed web 5 on its the end face 3 facing radially inwardly directed edge. This web 5 protects the connecting means against the penetration of molten metal or a molten alloy.
  • the Fig. 2 shows a schematic cross section of a die-cast piston head according to the invention along its cylinder axis 11 in a first embodiment in a disassembled state.
  • This die-cast piston head is identical to that in FIG Fig. 1 pictured die-cast piston head.
  • How out Fig. 2 very graphically shows the Druckgusskolbenkopf consists of only two components, namely a one-piece piston head 1 and a one-piece wear ring 2.
  • the groove 7 has along its arc length four, each offset by 90 ° arranged interruptions.
  • Fig. 3 is a schematic cross section of a Druckgusskolbenkopfes invention along its cylinder axis 11 shown in a third embodiment.
  • the basic structure of the die-cast piston head is very similar to that in Fig. 1 shown die-cast piston head.
  • the third embodiment illustrated here as acting between the piston head 1 and the wear ring 2 connecting means on the piston head 1 arranged spring 6 and arranged on the wear ring 2 groove 7 and at the same time two mutually engageable thread 10.
  • the threads 10 are metric fine threads with substantial self-locking.
  • the wear ring 2 In order to protect the threads 10 against the penetration of molten metal, the wear ring 2 has on its end face 3 facing, radially inwardly directed edge on a radially inwardly directed web 5.
  • the web 5 shifts the potential entry point of the melt between the piston head 1 and the wear ring 2 away from the sensitive threads 10 and thus acts as a protective cover for the thread 10 and the groove 7-spring 6 combination.
  • the Fig. 4 shows a schematic cross section of a die-cast piston head according to the invention along its cylinder axis 11 in a third embodiment in a disassembled state.
  • This die-cast piston head is identical to that in FIG Fig. 3 pictured die-cast piston head.
  • the Druckgusskolbenkopf consists of only two one-piece components, namely a piston head 1 and a wear ring 2.
  • the threads of the arranged on the wear ring 2 thread 10 are particularly easy to recognize.
  • the threads 10 are preferably metric fine thread.
  • other thread types for example trapezoidal threads, are encompassed by the present invention.
  • the two threads are provided in the region of the viewed from the piston end from the axially rearmost thread with two to three axially spaced drops of adhesive so that after screwing an approximately continuous adhesive layer, the two threads in this area cohesively connects.
  • Suitable adhesives according to the invention are all suitable adhesives, in particular silane-crosslinked, 2-component adhesives correspondingly high temperature stability, as required when using the pistons according to the invention.
  • FIG. 5 is a schematic cross section of a Druckgusskolbenkopfes invention along its cylinder axis 11 in a first embodiment shown in a detailed view.
  • the radial transitions 8 and 9 meet, act as sliding surfaces and thus facilitate the skipping of the spring 6.
  • Wear ring 2 consists of a hot-work steel.
  • the outer diameter of the wear ring 2 is up to 0.5 mm smaller than the outer diameter of the piston head 1 at room temperature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP12176775.0A 2011-08-05 2012-07-17 Piston de coulée sous pression Not-in-force EP2554296B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011052446A DE102011052446A1 (de) 2011-08-05 2011-08-05 Druckgusskolbenkopf

Publications (3)

Publication Number Publication Date
EP2554296A2 true EP2554296A2 (fr) 2013-02-06
EP2554296A3 EP2554296A3 (fr) 2014-07-23
EP2554296B1 EP2554296B1 (fr) 2019-05-22

Family

ID=46514230

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12176775.0A Not-in-force EP2554296B1 (fr) 2011-08-05 2012-07-17 Piston de coulée sous pression

Country Status (2)

Country Link
EP (1) EP2554296B1 (fr)
DE (1) DE102011052446A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018119517A1 (fr) * 2016-12-30 2018-07-05 Exco Technologies Limited Piston de coulée sous pression, et appareil de coulée sous pression incorporant ce dernier

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013017261B4 (de) 2013-10-17 2017-09-28 Wieland-Werke Ag Druckgießkolben
DE102024001007A1 (de) * 2024-03-28 2025-10-02 Wieland-Werke Aktiengesellschaft Kühleinrichtung und Druckgießkolben mit einer Kühleinrichtung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4886107A (en) 1986-02-28 1989-12-12 Zecman Kenneth P Piston for cold chamber
EP0423413A2 (fr) 1989-10-18 1991-04-24 Allper Ag Piston, notamment pour un appareil de coulée sous pression
EP0525229A1 (fr) 1991-07-29 1993-02-03 Allper Ag Piston, notamment pour pousser du métal liquide hors d'un cylindre de coulée
WO1996038246A1 (fr) 1995-06-01 1996-12-05 W. Fischer Representações Ltda. Piston a mouvement alternatif pour machine d'injection de metal liquide
WO2003074211A2 (fr) 2002-03-04 2003-09-12 Allper Ag Piston conçu pour une machine a coulee sous pression a chambre froide
DE20309181U1 (de) 2003-06-13 2004-10-28 Allper Ag Mehrteiliger Kolben für eine Kaltkammer-Druckgießmaschine
EP1837102A1 (fr) 2006-03-21 2007-09-26 Schmelzmetall Deutschland GmbH Piston pour une machine à couler sous pression

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB849373A (en) * 1957-01-23 1960-09-28 Nat Lead Co Improvements in or relating to die casting
DE4441735C2 (de) * 1994-11-23 2003-08-21 Hugo Kunz Druckgießkolben, insbesondere für Kaltkammer-Druckgießmaschinen
DE10040578C1 (de) 2000-08-18 2001-10-25 Kunz Susanne Druckgießkolben, insbesondere für Vakuum-Druckgießmaschinen
US20040020625A1 (en) 2002-07-29 2004-02-05 Jyoti Mazumder Fabrication of customized die inserts using closed-loop direct metal deposition (DMD)
DE102005048717A1 (de) 2005-10-12 2007-04-19 Allper Ag Mehrteiliger Kolben für eine Kaltkammer-Giessmaschine
WO2009146568A1 (fr) * 2008-06-05 2009-12-10 Mueller Andre Piston de coulée à insérer dans une chambre de coulée
IT1395085B1 (it) * 2009-01-21 2012-09-05 Brondolin S P A Anello di tenuta per pistoni da pressofusione

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4886107A (en) 1986-02-28 1989-12-12 Zecman Kenneth P Piston for cold chamber
EP0423413A2 (fr) 1989-10-18 1991-04-24 Allper Ag Piston, notamment pour un appareil de coulée sous pression
EP0525229A1 (fr) 1991-07-29 1993-02-03 Allper Ag Piston, notamment pour pousser du métal liquide hors d'un cylindre de coulée
WO1996038246A1 (fr) 1995-06-01 1996-12-05 W. Fischer Representações Ltda. Piston a mouvement alternatif pour machine d'injection de metal liquide
WO2003074211A2 (fr) 2002-03-04 2003-09-12 Allper Ag Piston conçu pour une machine a coulee sous pression a chambre froide
EP1483074B1 (fr) 2002-03-04 2007-06-13 Allper Ag Bague d'etancheite et piston pour un cylindre de coulee sous pression
DE20309181U1 (de) 2003-06-13 2004-10-28 Allper Ag Mehrteiliger Kolben für eine Kaltkammer-Druckgießmaschine
EP1837102A1 (fr) 2006-03-21 2007-09-26 Schmelzmetall Deutschland GmbH Piston pour une machine à couler sous pression

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018119517A1 (fr) * 2016-12-30 2018-07-05 Exco Technologies Limited Piston de coulée sous pression, et appareil de coulée sous pression incorporant ce dernier

Also Published As

Publication number Publication date
EP2554296B1 (fr) 2019-05-22
EP2554296A3 (fr) 2014-07-23
DE102011052446A1 (de) 2013-02-07

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