EP1804985A1 - Procede et dispositif pour produire en serie des pistons de moteurs a combustion interne sous l'effet d'une pression de gaz - Google Patents

Procede et dispositif pour produire en serie des pistons de moteurs a combustion interne sous l'effet d'une pression de gaz

Info

Publication number
EP1804985A1
EP1804985A1 EP05801991A EP05801991A EP1804985A1 EP 1804985 A1 EP1804985 A1 EP 1804985A1 EP 05801991 A EP05801991 A EP 05801991A EP 05801991 A EP05801991 A EP 05801991A EP 1804985 A1 EP1804985 A1 EP 1804985A1
Authority
EP
European Patent Office
Prior art keywords
casting
melt
feeder
gas pressure
piston
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
EP05801991A
Other languages
German (de)
English (en)
Other versions
EP1804985B1 (fr
Inventor
Siegfried Mielke
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.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt GmbH
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 KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP1804985A1 publication Critical patent/EP1804985A1/fr
Application granted granted Critical
Publication of EP1804985B1 publication Critical patent/EP1804985B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/088—Feeder heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/14—Casting in, on, or around objects which form part of the product the objects being filamentary or particulate in form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
    • B22D23/02—Top casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure

Definitions

  • the invention relates to a method and a device for series production of a piston for internal combustion engines according to the features of the preamble of patent claim 1.
  • casting tools which represent a negative mold for the piston blank to be produced and which are filled via a feed system with casting melt.
  • These are usually multi-part tools, consisting of two outer mold halves, a one- or multi-part core, which determines the small connecting rod eye facing inner contour of the piston and a casting bottom with a central feeder, the lings facing the combustion chamber surface of Kolbenroh ⁇ defined in the raw state. While the core and the outer mold halves remain close to one another even after the casting tool has been opened, the pouring tray is moved far away, sometimes up to two meters away from the casting tool, in order to improve access during the removal of the piston blank.
  • the inner surface of the feeder is usually lined with thermally highly insulating material.
  • the feeder which is likewise filled with molten casting, is to be kept liquid until complete solidification of the casting in order to provide sufficient melt for the make-up to compensate for the volume contraction during solidification.
  • the volume decreases by several percent. Since metal-free spaces (blowholes) must be avoided in the product in any case, the feeder is so angeord ⁇ net that z. B. due to gravity melt can flow out of it in the direction of the piston blank.
  • the invention is therefore based on the object of specifying a method for series production of a piston for internal combustion engines, with which the quality of the piston can be increased significantly er ⁇ .
  • the opening of the feeder in particular of the end of the feeder sleeve which is open at the top, is acted on by a gas pressure acting on the casting melt.
  • Casting floor with collar feeder is used. Exploited here is the large sealing surface between the mouth of the feeder and the piston, represented by the collar and the fact that the mouthpiece of the feeder sleeve conforms under internal pressure to the inner wall of the feeder collar and thereby safely separates the pressure chamber from the atmosphere.
  • a gas pressure is passed, which is supplied for example by a pressure line for a gas, such as nitrogen.
  • the casting melt filled into the chill casting tool is subjected to the gas pressure via the feeder sleeve before it solidifies and / or after the partial solidification of the casting melt.
  • the pressure line during the filling of the Kolbeng mantechnikmaschines with the molten casting is open to the environment.
  • the time at which the gas pressure is applied may vary and vary according to specifiable criteria.
  • the gas pressure is generated already after filling but before solidification of the casting melt. At this very early selected pressure load of the casting melt affects the Gas pressure almost on all areas of the filled G hasslescrimelze in the Kolbeng mantechnik ⁇ convincing, so that the hub structure of the piston blank can also have an effect.
  • the areas of the piston blank which are further away from the feeder sleeve can be influenced in a targeted manner in their structure, whereby, however, care must be taken to ensure that the piston mold closes very well and tightly and the gate must solidify very early, so that the gas pressure can actually rise the pourable melt present in the piston casting tool can have an effect and it is prevented that molten casting can pass outwardly from the piston casting tool as a result of the pressurization.
  • the solidification under gas pressure is known to lead to a very dense, ie almost completely void-free structure, since the volume deficit during solidification is made more secure by the acting gas pressure. While in normal chill casting only the hydrostatic pressure generated by the feeder acts, the gas pressure is added here.
  • a preferred embodiment of the invention can be seen in the fact that after filling the piston casting tool, the formation of an edge shell a solidified casting melt is waited for.
  • This edge shell made of solidified foundry melt has the advantage that thereby the gas pressure acting on the not yet solidified foundry melt is separated from the environment and thus prevents casting melt from escaping from the piston casting tool.
  • the cast melt will be added during the filling into the piston casting tool and / or after the partial solidification.
  • the addition of fiber material has the advantage that all or only certain Regions of the piston blank are reinforced by the addition of the fiber material, which is particularly advantageous that the fiber material is supplied only from a time after a peripheral shell has formed from solidified casting melt. If, for example, the bowl rim and / or the ring field of the later piston is to be reinforced with the fibers, the solidification of the filled casting melt in the hub area should also be awaited.
  • Reference numeral 1 designates a casting tool that, depending on the geometric design of the piston to be produced, consists of a plurality of molds (partial molds). These parts; of the casting tool 1 are shown here only schematically, so that it is, for example, a core 2 for the interior and a core 3 for the bolt hole.
  • the üb ⁇ rige, outer mold (or casting halves) are present, but not further described here be ⁇ .
  • casting melt is introduced into the casting mold 1 via a feed device, so that the free areas around the cores and casting molds are filled with molten casting.
  • a wall or collar 4 is formed around the feeder which holds the feeder contents in position when the casting tool is opened to realize short cycle times according to the method at a time at which the contents of the "collar feeder” 5
  • a peripheral edge 4 is formed on which a collar feeder 5 can be placed.
  • the casting melt 6 can rise to a desired level, so that above the filled casting melt 6 after the completion of the feed of casting melt within the collar feeder 5, a free space is created via which the casting melt is subjected to a gas pressure ,
  • the gas for this purpose is supplied via a pressure line 7, which is open during the filling process of the casting melt relative to the environment, so that a pressure equalization can take place.
  • a gas pressure is generated by suitable means, the then can act on the melt surface in the collar feeder 5 via the pressure line 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP05801991A 2004-10-27 2005-10-25 Procede et dispositif pour produire en serie des pistons de moteurs a combustion interne sous l'effet d'une pression de gaz Not-in-force EP1804985B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004052231A DE102004052231A1 (de) 2004-10-27 2004-10-27 Verfahren zur Serienherstellung von Kolben für Brennkraftmaschinen unter Gasdruckeinwirkung
PCT/EP2005/011438 WO2006045589A1 (fr) 2004-10-27 2005-10-25 Procede et dispositif pour produire en serie des pistons de moteurs a combustion interne sous l'effet d'une pression de gaz

Publications (2)

Publication Number Publication Date
EP1804985A1 true EP1804985A1 (fr) 2007-07-11
EP1804985B1 EP1804985B1 (fr) 2009-06-24

Family

ID=35445943

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05801991A Not-in-force EP1804985B1 (fr) 2004-10-27 2005-10-25 Procede et dispositif pour produire en serie des pistons de moteurs a combustion interne sous l'effet d'une pression de gaz

Country Status (4)

Country Link
EP (1) EP1804985B1 (fr)
AT (1) ATE434498T1 (fr)
DE (2) DE102004052231A1 (fr)
WO (1) WO2006045589A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017528324A (ja) * 2014-08-20 2017-09-28 マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ 鋳造工具および内燃エンジン用ピストンの製造方法
DE202022104611U1 (de) 2022-08-15 2022-08-22 Demin Srm Gmbh Feeder für Eisen- und Stahlguss

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005027540A1 (de) * 2005-06-15 2006-12-28 Ks Kolbenschmidt Gmbh Verkürzung der Taktzeit bei der Serienherstellung von Kolben für Brennkraftmaschinen
JP2009541063A (ja) * 2006-07-05 2009-11-26 カーエス コルベンシュミット ゲゼルシャフト ミット ベシュレンクテル ハフツング 鋳造品を製造する方法
US11772156B2 (en) 2021-01-20 2023-10-03 GM Global Technology Operations LLC In-line pressurization chamber for casting

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE664540C (de) * 1936-03-29 1938-08-29 Paul Matzow Verfahren und Vorrichtung zum Herstellen dichter Formgussstuecke unter Anwendung eines gasfoermigen Druckmittels
JPS5732869A (en) * 1980-08-08 1982-02-22 Toyota Motor Corp Pressure casting method
DE3760303D1 (en) * 1986-04-11 1989-08-17 Alusuisse Process and plant for pressure casting
US5335711A (en) * 1987-05-30 1994-08-09 Ae Plc Process and apparatus for metal casting
JPH03230860A (ja) * 1990-02-06 1991-10-14 Mazda Motor Corp 加圧鋳造方法
US5301739A (en) * 1992-06-30 1994-04-12 Cook Arnold J Method for casting and densification
WO1995018689A1 (fr) * 1994-01-03 1995-07-13 Georg Fischer Disa A/S Procede et materiel permettant d'alimenter des cavites de retrait dans les moulages en metal
JP3212245B2 (ja) * 1995-08-30 2001-09-25 マツダ株式会社 鋳造方法及び鋳造装置並びに鋳造品
US6283196B1 (en) * 1997-03-18 2001-09-04 Georg Fischer Disa A/S Method, Pressure-supply member and pressure-supply system for active after-feeding of castings
DE29924140U1 (de) * 1999-07-09 2002-03-07 Al Sibai Faruk Vorrichtung zum Schwerkraftgießen von Gußteilen
JPWO2004105980A1 (ja) * 2003-05-29 2006-07-20 コルベンシュミット株式会社 繊維強化アルミニウム合金ピストンの製造装置及びその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006045589A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017528324A (ja) * 2014-08-20 2017-09-28 マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ 鋳造工具および内燃エンジン用ピストンの製造方法
DE202022104611U1 (de) 2022-08-15 2022-08-22 Demin Srm Gmbh Feeder für Eisen- und Stahlguss

Also Published As

Publication number Publication date
EP1804985B1 (fr) 2009-06-24
DE502005007586D1 (de) 2009-08-06
ATE434498T1 (de) 2009-07-15
WO2006045589A1 (fr) 2006-05-04
DE102004052231A1 (de) 2006-05-11

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