EP0616040A1 - Verfahren zur Behandlung einer Gusseisenschmelze mit Lamellengraphit zur Herstellung von Nockenwellen - Google Patents

Verfahren zur Behandlung einer Gusseisenschmelze mit Lamellengraphit zur Herstellung von Nockenwellen Download PDF

Info

Publication number
EP0616040A1
EP0616040A1 EP94400552A EP94400552A EP0616040A1 EP 0616040 A1 EP0616040 A1 EP 0616040A1 EP 94400552 A EP94400552 A EP 94400552A EP 94400552 A EP94400552 A EP 94400552A EP 0616040 A1 EP0616040 A1 EP 0616040A1
Authority
EP
European Patent Office
Prior art keywords
cast iron
lamellar graphite
iron
deoxidizing element
weight
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
EP94400552A
Other languages
English (en)
French (fr)
Other versions
EP0616040B1 (de
Inventor
Yves Desalos
Dominique Dabouineau
Joel Legal
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.)
Renault SAS
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0616040A1 publication Critical patent/EP0616040A1/de
Application granted granted Critical
Publication of EP0616040B1 publication Critical patent/EP0616040B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/08—Manufacture of cast-iron

Definitions

  • the invention relates to a process for treating a lamellar graphite cast iron intended for the manufacture of camshafts according to which the said cast iron is brought to the melting temperature before extracting the oxides from the cast iron after settling.
  • the invention relates more particularly to the process for treating such a lamellar graphite cast iron in order to prepare the camshafts for a surface reflow treatment.
  • the publication FR-A-2 292 043 describes a process for adding 15 to 50% by weight of magnesium particles to the molten metal preceding the casting operation.
  • the addition of such an amount of magnesium in a cast iron with lamellar graphite makes it possible to deoxidize the cast iron but transforms the lamellar graphite into nodular or spheroidal graphite.
  • the subject of the invention is the production of camshafts of cast iron with lamellar graphite, the machining of which is easier than the machining carried out on camshafts of cast iron with nodular or spheroidal graphite.
  • the subject of the invention is also the production of camshafts of cast iron with lamellar graphite capable of undergoing a surface reflow treatment giving said camshafts a much greater hardness, without causing the creation of defects in particular in the structure of the parts. finished.
  • the object of the invention is therefore to deoxidize the lamellar graphite cast iron before it is cast, without modifying the lamellar structure of the graphite, with the aim of eliminating the defects generated during the surface reflow treatment.
  • the deoxidizing element when the cast iron has a high sulfur content, the deoxidizing element, introduced in small quantities, reacts only with the sulfur.
  • the object of the invention is therefore to provide an addition of a deoxidizing element in a very low sulfur cast iron.
  • the process is characterized by the fact that 0.001% to 0.02% by weight of a deoxidizing element is introduced before casting into the iron bath in order to obtain a low-lamellar graphite cast iron. oxygen and nitrogen content.
  • the process consists of a first step of melting the lamellar graphite cast iron which is brought to a melting temperature of around 1500 ° C.
  • the metal bath obtained after melting undergoes desulfurization.
  • This desulphurization can be carried out, for example, by adding a desulphurizing agent introduced inside a fusible conduit with bubbling of an inert gas, the temperature being maintained around 1420 ° C, so as to obtain at the end of this treatment a sulfur content of less than 0.035% by weight.
  • the process continues with decantation lasting twenty minutes, which allows the oxides present in the cast iron to be extracted in the form of precipitates, such as MgO, MgS, etc.
  • This deoxidation does not reach dissolved gases, such as oxygen or nitrogen dioxide.
  • the decantation carried out is followed by a temperature rise which allows the addition of a deoxidizing element consisting of magnesium in the form of an alloy containing from 5 to 30% by weight of magnesium.
  • the deoxidizing element consists of cerium.
  • the deoxidizing element consists of barium.
  • the deoxidizing element consists of calcium.
  • the addition of magnesium is carried out for example by using a fusible conduit.
  • the magnesium thus introduced forms complexes with the oxides remaining in the cast iron, which are inert during a surface reflow treatment.
  • Camshafts whose area occupied by faults is less than 1% of the area of the camshaft are considered to be "acceptable” defects. without adding Mg addition of Mg + desulfurization addition of Mg (S ⁇ 0.035%) % of parts without defects 10 69 75 % of "acceptable" parts 40 28 25 % of discarded parts 50 3 0

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Heat Treatment Of Articles (AREA)
EP19940400552 1993-03-19 1994-03-15 Verfahren zur Behandlung einer Gusseisenschmelze mit Lamellengraphit zur Herstellung von Nockenwellen Expired - Lifetime EP0616040B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9303182A FR2702687B1 (fr) 1993-03-19 1993-03-19 Procédé de traitement d'une fonte à graphite lamellaire destinée à la fabrication des arbres à cames.
FR9303182 1993-03-19

Publications (2)

Publication Number Publication Date
EP0616040A1 true EP0616040A1 (de) 1994-09-21
EP0616040B1 EP0616040B1 (de) 1999-05-19

Family

ID=9445147

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940400552 Expired - Lifetime EP0616040B1 (de) 1993-03-19 1994-03-15 Verfahren zur Behandlung einer Gusseisenschmelze mit Lamellengraphit zur Herstellung von Nockenwellen

Country Status (3)

Country Link
EP (1) EP0616040B1 (de)
DE (1) DE69418516T2 (de)
FR (1) FR2702687B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001055458A1 (en) * 2000-01-28 2001-08-02 Subramanian Sundaresa V Process for producing gray cast iron for use in high speed machining with cubic boron nitride and silicon nitride tools and the gray cast iron so produced
FR2818663A1 (fr) * 2000-12-22 2002-06-28 Mannesmann Sachs Ag Alliage de fonte grise pour un element de friction d'un embrayage a friction et element ainsi realise
DE102009004189A1 (de) * 2009-01-09 2010-07-22 Man Nutzfahrzeuge Ag Gusseisenlegierung für Zylinderköpfe
WO2010091486A1 (en) * 2009-02-12 2010-08-19 Teksid Do Brasil Ltda Method to obtain a high resistance gray iron alloy for combustion engines and general casts
CN110894582A (zh) * 2019-12-10 2020-03-20 西安工业大学 一种高强度和高导热蠕墨铸铁及其制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2244220A1 (de) * 1971-09-09 1973-03-22 Toyo Kogyo Co Formkoerper aus gusseisen mit gehaerteten oberflaechen sowie verfahren zu ihrer herstellung
FR2340986A1 (fr) * 1976-02-10 1977-09-09 British Cast Iron Res Ass Fonte et son procede de production
DE3912916A1 (de) * 1988-08-03 1990-02-08 Winter Fritz Eisengiesserei Verfahren zur herstellung eines gusskoerpers aus gusseisen mit lamellengraphit und danach hergestellte nockenwelle
JPH02258952A (ja) * 1989-03-30 1990-10-19 Kubota Ltd 高弾性率を有する耐摩耗性鋳鉄材

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2244220A1 (de) * 1971-09-09 1973-03-22 Toyo Kogyo Co Formkoerper aus gusseisen mit gehaerteten oberflaechen sowie verfahren zu ihrer herstellung
FR2340986A1 (fr) * 1976-02-10 1977-09-09 British Cast Iron Res Ass Fonte et son procede de production
DE3912916A1 (de) * 1988-08-03 1990-02-08 Winter Fritz Eisengiesserei Verfahren zur herstellung eines gusskoerpers aus gusseisen mit lamellengraphit und danach hergestellte nockenwelle
JPH02258952A (ja) * 1989-03-30 1990-10-19 Kubota Ltd 高弾性率を有する耐摩耗性鋳鉄材

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 9048, Derwent World Patents Index; Class M27, AN 90-358321 [48] *
PATENT ABSTRACTS OF JAPAN vol. 15, no. 007 (C - 794) 9 January 1991 (1991-01-09) *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001055458A1 (en) * 2000-01-28 2001-08-02 Subramanian Sundaresa V Process for producing gray cast iron for use in high speed machining with cubic boron nitride and silicon nitride tools and the gray cast iron so produced
US6395107B1 (en) 2000-01-28 2002-05-28 Sundaresa V. Subramanian Cast iron for use in high speed machining with cubic boron nitride and silicon nitride tools
US6537395B2 (en) 2000-01-28 2003-03-25 Sundaresa V. Subramanian Process for producing gray cast iron for use in high speed machining with cubic boron nitride and silicon nitride tools
FR2818663A1 (fr) * 2000-12-22 2002-06-28 Mannesmann Sachs Ag Alliage de fonte grise pour un element de friction d'un embrayage a friction et element ainsi realise
US6723180B2 (en) 2000-12-22 2004-04-20 Mannesmann Sachs Ag Friction clutch comprising a friction element formed of flake graphite alloy
DE102009004189A1 (de) * 2009-01-09 2010-07-22 Man Nutzfahrzeuge Ag Gusseisenlegierung für Zylinderköpfe
US9132478B2 (en) 2009-01-09 2015-09-15 Man Truck & Bus Ag Cast iron alloy for cylinder heads
DE102009004189B4 (de) * 2009-01-09 2013-07-25 Man Truck & Bus Ag Bauteil aus einer Gusseisenlegierung, insbesondere für Zylinderköpfe
CN102317480A (zh) * 2009-02-12 2012-01-11 泰克西多巴西有限公司 获得用于内燃机及一般铸件的高电阻灰铁合金的方法
KR20110132563A (ko) * 2009-02-12 2011-12-08 텍시드 도 브라질 엘티디에이. 연소기관 및 일반 주조물용 고저항 회주철 합금을 얻기 위한 방법
CN102317480B (zh) * 2009-02-12 2014-04-02 泰克西多巴西有限公司 获得用于内燃机及一般铸件的高电阻灰铁合金的方法
WO2010091486A1 (en) * 2009-02-12 2010-08-19 Teksid Do Brasil Ltda Method to obtain a high resistance gray iron alloy for combustion engines and general casts
US9284617B2 (en) 2009-02-12 2016-03-15 Teksid Do Brasil Ltda. Method to obtain a high resistance gray iron alloy for combustion engines and general casts
KR101629215B1 (ko) 2009-02-12 2016-06-10 텍시드 도 브라질 엘티디에이. 연소기관 및 일반 주조물용 고저항 회주철 합금을 얻기 위한 방법
CN110894582A (zh) * 2019-12-10 2020-03-20 西安工业大学 一种高强度和高导热蠕墨铸铁及其制备方法
CN110894582B (zh) * 2019-12-10 2021-01-05 西安工业大学 一种高强度和高导热蠕墨铸铁及其制备方法

Also Published As

Publication number Publication date
EP0616040B1 (de) 1999-05-19
DE69418516T2 (de) 1999-12-23
FR2702687A1 (fr) 1994-09-23
DE69418516D1 (de) 1999-06-24
FR2702687B1 (fr) 1995-04-28

Similar Documents

Publication Publication Date Title
FR2706489A1 (fr) Acier inoxydable martensitique à usinabilité améliorée.
EP0616040A1 (de) Verfahren zur Behandlung einer Gusseisenschmelze mit Lamellengraphit zur Herstellung von Nockenwellen
EP0738783A1 (de) Rostfreier austenitischer Stahl geeignet für die Herstellung von Drähte
KR100363417B1 (ko) 저탄소 스테인레스강의 탈탄법
US9023126B2 (en) Additive for treating resulphurized steel
JP2004169147A (ja) 非金属介在物の極めて少ない清浄鋼の精錬方法
JP4111352B2 (ja) ステンレス鋼の高清浄化精錬法
JP2002012912A (ja) 高炭素低窒素鋼の製造方法
BE1006831A5 (fr) Procede d'elaboration d'un acier a outils destine notamment a la fabrication de moules et acier obtenu par ce procede.
JP4648820B2 (ja) 極低硫含クロム溶鋼の製造方法
KR100729123B1 (ko) 저탄소 오스테나이트계 스테인레스강의 제조방법
JPH07188831A (ja) ステンレス鋼の製造方法および装置
CH602948A5 (en) Lamellar graphitic grey cast iron
KR100485095B1 (ko) 용강 정련방법
JPH10287953A (ja) 機械的性質とドリル穴あけ加工性に優れた機械構造用鋼
KR980009473A (ko) 저탄소, 저질소 스테인레스강의 정련방법
US3309194A (en) Purification of alloys
JP7328534B2 (ja) 鋼の溶製方法
SU1500682A1 (ru) Способ выплавки и внепечной обработки подшипниковой стали 2
US4681642A (en) Cast iron making by cerium addition
SU1683938A1 (ru) Состав электродной проволоки
JP2523516B2 (ja) 転動疲労性の優れる肌焼鋼の製造方法
JPH05331523A (ja) 軸受鋼用溶鋼の精錬方法
KR20030046945A (ko) 인바용강의 정련방법
SU1650333A1 (ru) Шлакообразующа смесь

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES GB IT

17P Request for examination filed

Effective date: 19950301

17Q First examination report despatched

Effective date: 19970801

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: RENAULT

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES GB IT

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 FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19990519

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19990519

REF Corresponds to:

Ref document number: 69418516

Country of ref document: DE

Date of ref document: 19990624

GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19990519

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

Ref country code: DE

Payment date: 20000224

Year of fee payment: 7

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
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

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

Effective date: 20020101

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;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050315