[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

EP1094908A1 - Procede pour produire un arbre a cames en acier, et arbre a cames ainsi produit - Google Patents

Procede pour produire un arbre a cames en acier, et arbre a cames ainsi produit

Info

Publication number
EP1094908A1
EP1094908A1 EP99947245A EP99947245A EP1094908A1 EP 1094908 A1 EP1094908 A1 EP 1094908A1 EP 99947245 A EP99947245 A EP 99947245A EP 99947245 A EP99947245 A EP 99947245A EP 1094908 A1 EP1094908 A1 EP 1094908A1
Authority
EP
European Patent Office
Prior art keywords
camshaft
steel
casting
pouring
molds
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
EP99947245A
Other languages
German (de)
English (en)
Other versions
EP1094908B1 (fr
Inventor
Martin Basler
Ulrich Engelhart
Peter Grahle
Volker Korte
Jürgen Schmid
Matthias Vogelsang
Jens WIESENMÜLLER
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.)
Mahle Ventiltrieb GmbH
Original Assignee
Mahle Ventiltrieb 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 Mahle Ventiltrieb GmbH filed Critical Mahle Ventiltrieb GmbH
Publication of EP1094908A1 publication Critical patent/EP1094908A1/fr
Application granted granted Critical
Publication of EP1094908B1 publication Critical patent/EP1094908B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B22C7/023—Patterns made from expanded plastic materials
    • B22C7/026—Patterns made from expanded plastic materials by assembling preformed parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F2200/00—Manufacturing
    • F02F2200/06—Casting
    • F02F2200/08—Casting using a lost model, e.g. foam casting

Definitions

  • the invention relates to a method for producing a one-piece, profiled hollow camshaft made of steel.
  • Profiled means that the camshaft is tubular with a profiled inner surface that corresponds to the contours of the cams and the bearing areas on the camshaft in a certain sense.
  • Steel camshafts are known, for example, from JP 02 102 302 A.
  • camshafts are suitable and intended for valve drives of internal combustion engines in which the valve is actuated in particular via a roller contact to the camshaft.
  • camshafts are required that can withstand Hertzian surface pressures of up to 2,500 MPa throughout the engine life without damaging the tread.
  • the design as a hollow camshaft has the advantage, on the one hand, of saving weight and, on the other hand, of being able to lubricate through the camshaft. From JP 61 115 660 A and JP 62 296 935 A it is known to manufacture metal cam shafts in a lost foam casting process.
  • the invention is concerned with the problem of being able to produce a generic camshaft as efficiently as possible.
  • a gate system according to claim 2 is of particular importance for casting production.
  • the casting molds are based on the principle of the lost foam casting system. This means that the camshaft is created and used as a lost form from, for example, a polymer blank with an external small amount of material for the finishing. This blank, which dissolves when pouring the cast steel, is placed in a sand form inserted, the hollow interior also being filled with sand.
  • the polymer used is one that has a special chemical composition that prevents harmful carburizing processes when pouring the molten steel. As a result, the high geometric requirements for the casting mold required when carrying out the teaching according to the invention are met.
  • a special sprue system according to the subclaims is used according to the invention, by means of which it is possible to cast a large number of camshafts, for example more than 50, at the same time.
  • the plug-in system shown in the subclaims is used.
  • the use of adhesive can be dispensed with, which has an advantageous effect on the casting quality.
  • Fig. 1 shows a sand mold box without sand with a mold consisting of a large number of individual, interconnected molds.
  • the mold device shown consists of a central, vertically aligned filling channel 1 for liquid casting material to be filled into the device, which is connected at its lower end via horizontally star-shaped connecting channels 2 with pouring channels 3 for the camshaft molds 4.
  • All of the above-mentioned parts consist of material that melts under the casting material, such as, for example, a polymer known from lost foam casting processes. However, it can be expedient to design the filler channel 1 from a non-melting material.
  • the camshaft molds 4 are arranged axially parallel to the respective pouring channel 3, around which they are distributed, and are connected to the latter via its height via a plurality of gate connections 5.
  • the individual pouring channels 3, of which a large number may be present, are each closed at their upper ends with a ceramic stopper 6 as a throttle valve.
  • the parts 1, 2, 3, 4 and possibly also 5 of the casting device which melt during the execution of the casting process are each coated on their surfaces with a size-acting size.
  • the material of this size also ensures sufficient permeability of the gases formed when the lost molded parts, ie the polymer parts, are dissolved. This simple ensures, in particular, a high surface quality of the camshafts produced according to the invention.
  • a molding box 7 is filled with sand in such a way that all meltable molded parts are completely enclosed by sand.
  • Fully enclosed in the case of the camshaft casting molds means that they are also completely filled with sand in their inner, profiled cavity.
  • the sand surrounding the molded parts is merely poured into the molding box 7 as loose sand and is not pressed there in any particular way.
  • the molding box 7 vibrates to achieve a good molding sand distribution.
  • the individual parts of the pouring device are simply non-positively inserted into one another.
  • the filling channel 1 is plugged into a composite part formed from the connecting channels 2 and the pouring channels 3 into the connecting channels 2.
  • the camshaft casting molds 4 are also only plugged into the respective pouring channel 3, specifically via the gate connections 5. Even the camshaft casting shapes 4 can be built up from individual parts in the axial direction and put together.
  • the sequence of filling a pouring device molded in sand inside a molding box 7 is as follows.
  • Liquid casting material is introduced into the filler channel 1 and passes through the connecting channels 2 from below into the pouring channels 3. From there, the casting material penetrates through the gate connections 5 into the individual camshaft casting molds 4, the casting material being uniform in the respective pouring channel 3 and with it connected camshaft molds 4 rises.
  • the ceramic plug 6 creates a certain casting pressure above atmospheric pressure when the casting material penetrates into the pouring channels 3. Under the heat of the casting material, the individual molded parts of the casting device dissolve in a manner which is customary in the lost foam casting process known per se. In order to achieve good casting quality and to ensure sufficient dimensional stability of the casting device during the casting process, the size coating on the individual molded parts is of particular importance.
  • the casting material in the form of the casting device can simply be pulled out of the sand bed of the molding box 7 and completely removed from the casting sand by shaking.
  • This provides an extremely efficient manufacturing process.
  • more than 50 camshafts can be produced in a single system arrangement in a single casting process.
  • the individual camshafts must of course still be mechanically freed from the respective sprues or sprue channels after their manufacture in the casting process described.
  • this is possible in a simple, customary manner.
  • a particularly favorable material for a camshaft that can be produced according to the invention has the following composition in% by weight:
  • camshafts are mechanically pre-processed at the bearing points and the cam running points, solidified at the edge layer by, for example, inductive hardening, case hardening, carbonitriding or other comparable processes and then finished. Finishing is expediently carried out by grinding.
  • camshafts according to the invention have a typical surface relief which is known from styrofoam parts at locations which are not machined. The cavity of the camshaft is not machined. In places of the camshaft that are not specially hardened at the surface, the surface hardness is 150 to 400 HB.
  • the size of the casting defects is limited to 0.1 mm by the method according to the invention in a range of 1 mm below the cam surfaces.
  • the hardness of the cam surface is between 35 and 70 HRC, depending on the surface pressure required.
  • the cam surface typically has residual stresses between 50 and 600 MPa.
  • the structure of the camshaft according to the invention is ferritic-pearlitic or ledeburitic. In the area of surface hardening, there are typically martensitic or bainitic structures.
  • C, N or B contents increased by 0.1 to 3% can also be present in this area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Gears, Cams (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

Selon l'invention, un arbre à cames en acier moulé présentant une cavité interne de forme cylindrique, notamment profilée, peut être produit de manière rationnelle selon un procédé de coulée en mousse perdue, connu en soi. Un arbre à cames en acier, produit selon ce procédé, peut supporter sans dommage, sur une longue période d'utilisation, des pressions superficielles hertziennes extrêmement élevées au niveau de ses surfaces de roulement.
EP99947245A 1998-07-25 1999-07-21 Procede pour produire un arbre a cames en acier, et arbre a cames ainsi produit Expired - Lifetime EP1094908B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19833594A DE19833594A1 (de) 1998-07-25 1998-07-25 Nockenwelle aus Stahlguß
DE19833594 1998-07-25
PCT/DE1999/002244 WO2000006320A1 (fr) 1998-07-25 1999-07-21 Procede pour produire un arbre a cames en acier, et arbre a cames ainsi produit

Publications (2)

Publication Number Publication Date
EP1094908A1 true EP1094908A1 (fr) 2001-05-02
EP1094908B1 EP1094908B1 (fr) 2005-09-21

Family

ID=7875338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99947245A Expired - Lifetime EP1094908B1 (fr) 1998-07-25 1999-07-21 Procede pour produire un arbre a cames en acier, et arbre a cames ainsi produit

Country Status (5)

Country Link
US (1) US6478074B1 (fr)
EP (1) EP1094908B1 (fr)
BR (1) BR9912441A (fr)
DE (3) DE19833594A1 (fr)
WO (1) WO2000006320A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10340994A1 (de) * 2003-09-05 2005-03-31 Mahle Ventiltrieb Gmbh Verfahren zur Herstellung eines hochlegierten Stahlgusswerkstoffes mit feiner Kornstruktur.
JP4137122B2 (ja) * 2003-10-31 2008-08-20 日本ピストンリング株式会社 カムシャフトの製造方法、カムシャフト及びこれに用いるカムロブ材
DE102006015735A1 (de) * 2006-04-04 2007-10-11 Stahlschmidt & Maiworm Technics Gmbh Verfahren zur Herstellung eines Lagerrahmens zur Lagerung einer Kurbelwelle und ein solcher Lagerrahmen
US8136571B2 (en) * 2009-05-19 2012-03-20 Debruin Mark Carbidic outer edge ductile iron product, and as cast surface alloying process
DE102009025023A1 (de) 2009-06-10 2010-12-16 Neumayer Tekfor Holding Gmbh Verfahren zur Herstellung einer Nockenwelle und entsprechende Nockenwelle
DE102013223179A1 (de) 2013-11-14 2015-05-21 Bayerische Motoren Werke Aktiengesellschaft Komplexes Gussbauteil sowie Gießverfahren hierfür
DE102014008978A1 (de) 2014-06-17 2016-01-21 Daimler Ag Verfahren zum Herstellen eines Stahlkolbens und Stahlkolben für einen Verbrennungsmotor
MX2016010930A (es) * 2016-08-23 2017-04-03 Arbomex S A De C V Proceso de fabricacion de arbol de levas con componente funcional como inserto de ensamble y el arbol de levas obtenido con el mismo.

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE120104C (fr)
DE2041777A1 (de) * 1970-08-22 1972-02-24 Ferdinand Just Verfahren zur Herstellung von Freiformguessen
DE2424590A1 (de) * 1974-05-21 1975-12-04 Buderus Eisenwerk Verfahren zur herstellung einer gegossenen kurbel- bzw. nockenwelle
DD120104A3 (fr) * 1974-05-28 1976-06-05
FR2456785A1 (fr) * 1979-05-17 1980-12-12 Daido Steel Co Ltd Acier de decolletage contenant des inclusions determinees et un procede de sa preparation
DE3416132C2 (de) * 1984-05-02 1986-11-06 Bernd 7530 Pforzheim Schüssler Vorrichtung zum Guß von insbesondere geschmolzenem Metall
JPS61115660A (ja) 1984-11-13 1986-06-03 Nissan Motor Co Ltd カムシャフトの製造方法
US4673023A (en) * 1984-12-14 1987-06-16 Outboard Marine Corporation Multipart lost foam pattern and method of making same
JPS61241444A (ja) * 1985-04-19 1986-10-27 Toyota Motor Corp 一体型ベアリングキヤツプの製造方法
DE3532196A1 (de) * 1985-09-10 1987-04-16 Wizemann Gmbh U Co J Nockenwelle und vorrichtung zu ihrer herstellung
JPH062303B2 (ja) 1986-06-16 1994-01-12 本田技研工業株式会社 金型による鋳物の製造方法
JPS63264248A (ja) * 1987-04-22 1988-11-01 Mazda Motor Corp 中空カムシヤフトの製造方法
US4791977A (en) * 1987-05-07 1988-12-20 Metal Casting Technology, Inc. Countergravity metal casting apparatus and process
JPS6462444A (en) * 1987-09-02 1989-03-08 Kawasaki Steel Co Press die steel
JPH01238765A (ja) * 1988-03-18 1989-09-22 Jidosha Imono Kk カム軸の製造方法
JPH02102302A (ja) 1988-10-11 1990-04-13 Honda Motor Co Ltd カムシャフト及びその製造方法
JPH02137641A (ja) * 1988-11-16 1990-05-25 Tokico Ltd 鋳造用消失模型
GB2228012B (en) * 1989-01-19 1993-04-07 Nippon Piston Ring Co Ltd Camshaft and method for producing the same
JPH04167946A (ja) * 1990-10-30 1992-06-16 Kubota Corp フルモールド鋳造用鋳型
DE4100779A1 (de) * 1991-01-12 1991-07-18 Daimler Benz Ag Verfahren zum giessen von nockenwellenrohlingen aus unterschiedlichen eisenwerkstoffen
JPH071076A (ja) * 1993-06-15 1995-01-06 Kubota Corp 消失模型鋳造の造型方法
JPH0711377A (ja) 1993-06-24 1995-01-13 Daido Steel Co Ltd 焼結工具鋼の製造方法
CH686711A5 (de) * 1993-07-20 1996-06-14 Von Roll Ag Verfahren zur Herstellung eines Bauteils aus Eisenwerkstoff.
DE4411795A1 (de) * 1994-04-06 1995-12-14 Kugelfischer G Schaefer & Co Nichtrostender Stahl für das Einsatzhärten mit Stickstoff
DE4431713C2 (de) * 1994-09-06 2001-03-15 Audi Ag Vorrichtung zum Herstellen von Gußstücken
US5560420A (en) * 1994-11-25 1996-10-01 The United States Of America As Represented By The Secretary Of The Interior Process for casting hard-faced, lightweight camshafts and other cylindrical products

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0006320A1 *

Also Published As

Publication number Publication date
DE59912583D1 (de) 2006-02-02
BR9912441A (pt) 2001-04-17
DE19981402D2 (de) 2001-07-12
WO2000006320A1 (fr) 2000-02-10
US6478074B1 (en) 2002-11-12
DE19833594A1 (de) 2000-01-27
EP1094908B1 (fr) 2005-09-21

Similar Documents

Publication Publication Date Title
DE3501433C2 (fr)
DD151126A5 (de) Verfahren und vorrichtung zur herstellung von nockenwellen
DE2540061A1 (de) Rollenstoessel
EP0405156A1 (fr) Poussoir de soupape en forme de godet
EP1094908A1 (fr) Procede pour produire un arbre a cames en acier, et arbre a cames ainsi produit
DE2145168A1 (de) Guß-Kern
EP0271638B1 (fr) Arbre coulé, en particulier arbres à cames
EP1704943A1 (fr) Procédé de fabrication d'un disque de roue et disque de roue pour véhicule
DE102017131280A1 (de) Verfahren zum Herstellen eines Formteils sowie Speisereinsatz zur Verwendung in einem solchen Verfahren
DE112007003626T5 (de) Verfahren zum Erhalten eines geschmiedeten, aufgekohlten Pulvermetallteils
DE102013223301A1 (de) Nockenwellenverstelleinrichtung
EP2083956B1 (fr) Procede de fabrication d'une roue multiple metallique en une seule piece et roue multiple
DE112007003621T5 (de) Pulvermetall-Verbundzahnrad mit variierender Grenze sowie Verfahren
DE102016122080A1 (de) Gegossene Zu- und Ablauföffnungen bei Stahlguss- und Eisengusskolben
EP1912754A1 (fr) Ebauche de fonderie de culasse, culasse coulee pour moteurs diesel et procede de production d'une ebauche de fonderie de culasse
DE10003821C5 (de) Kolben, insbesondere ein Leichtmetallkolben für eine Brennkraftmaschine
WO2013010798A1 (fr) Noyau de coulée d'un moule pour la fabrication d'un cylindre
DE102012101887A1 (de) Vorrichtung zur Herstellung eines Zylinderkurbelgehäuses in V-Bauform
DE4314138C1 (de) Welle mit mindestens zum Teil nichtzylindrischer Außenfläche
DE112016005843T5 (de) Verfahren zum Herstellen eines Stifts für eine Form für einen Druckgussprozess
DE19932810C2 (de) Verfahren zur Herstellung einer Nockenwelle und danach hergestellte Nockenwelle
WO2011144397A1 (fr) Distributeur de carburant et utilisation dudit distributeur de carburant
WO2007054299A1 (fr) Piston en acier d'une seule piece en variante d'une coulee de precision avec un noyau pour la fabrication technique par coulee de pression d'un canal de refroidissement
DE102015004793A1 (de) Verfahren zum Herstellen eines Nockenstücks für eine Nockenwelle
DE102004056870A1 (de) Kolben mit einem Kühlkanal für einen Verbrennungsmotor und Verfahren zur Herstellung des Kolbens

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

17P Request for examination filed

Effective date: 20001221

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

17Q First examination report despatched

Effective date: 20030317

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RBV Designated contracting states (corrected)

Designated state(s): DE FR GB IT

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REF Corresponds to:

Ref document number: 59912583

Country of ref document: DE

Date of ref document: 20051027

Kind code of ref document: P

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 59912583

Country of ref document: DE

Date of ref document: 20060202

Kind code of ref document: P

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20060622

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20150727

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20150730

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: 20150723

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: 20150930

Year of fee payment: 17

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59912583

Country of ref document: DE

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20160721

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: 20160801

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20170331

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: 20160721

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: 20160721