EP0616040B1 - Procédé de traitement d'une fonte à graphite lamellaire destinée à la fabrication des arbres à cames - Google Patents
Procédé de traitement d'une fonte à graphite lamellaire destinée à la fabrication des arbres à cames Download PDFInfo
- Publication number
- EP0616040B1 EP0616040B1 EP19940400552 EP94400552A EP0616040B1 EP 0616040 B1 EP0616040 B1 EP 0616040B1 EP 19940400552 EP19940400552 EP 19940400552 EP 94400552 A EP94400552 A EP 94400552A EP 0616040 B1 EP0616040 B1 EP 0616040B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- iron
- cast
- process according
- cast iron
- deoxidising
- 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.)
- Expired - Lifetime
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 method for treating a graphite cast iron. lamellar intended for the manufacture of camshafts according to which brings the said melting temperature to the melting temperature before extracting after settling the oxides of the cast iron.
- the invention relates more particularly to the method of treatment of a such as lamellar graphite cast iron for the purpose of preparing the camshafts to 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 lamellar graphite cast iron makes it possible to deoxidize the cast iron but transforms the lamellar graphite into nodular or spheroidal graphite.
- Publication DE-A-2 244 220 relates to a method for treating a lamellar graphite cast iron for the manufacture of a body intended to undergo a surface reflow treatment into which an element is introduced deoxidizer in the iron bath so as to limit the appearance of surface defects, however this process does not guarantee that camshafts with a small percentage of discarded parts.
- the subject of the invention is the production of cast iron camshafts at lamellar graphite whose machining is easier than the machining carried out on nodular or spheroidal cast iron camshafts.
- the invention also relates to the production of cast iron camshafts with lamellar graphite likely to undergo reflow treatment superficial giving said camshafts a much higher hardness important, without causing the creation of faults especially in the structure of finished parts.
- the object of the invention is thus to deoxidize lamellar graphite cast iron before casting, without modifying the lamellar structure of graphite, in the purpose of removing the faults generated during the reflow treatment superficial.
- the object of the invention is therefore to add an element deoxidizer in very low sulfur cast iron.
- the process consists of a first step of melting graphite cast iron lamellar which is brought to a melting temperature of approximately 1500 ° C.
- the bath metal obtained after fusion undergoes desulfurization.
- This desulfurization can be carried out, by way of example, by adding a desulfurizing agent introduced inside a fusible conduit with bubbling an inert gas, the temperature being maintained around 1420 ° C., so as to obtain at the end of this treatment a lower sulfur content at 0.035% by weight.
- the process continues with decantation lasting around twenty minutes which extracts the oxides present in the melt in the form of precipitates, such as MgO, MgS, etc.
- This deoxidation does not reach dissolved gases, such as dioxide oxygen or nitrogen.
- the decantation carried out is followed by a rise in temperature 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 is consisting of cerium.
- the deoxidizing element consists of barium.
- the element deoxidizer consists of calcium.
- the process for which the deoxidizing element will be described by way of example consists of magnesium.
- the addition of magnesium is carried out for example by using a fuse leads.
- the magnesium thus introduced forms complexes with the oxides remaining in the cast iron, which are inert during reflow treatment superficial.
- 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)
Description
L'addition d'une telle quantité de magnésium dans une fonte à graphite lamellaire permet de désoxyder la fonte mais transforme le graphite lamellaire en graphite nodulaire ou sphéroïdal.
C % | Si % | P % | Mn % | Cr % | Cu % | Sn % | V % | Mo % | Autres % |
2,6-3,5 | 1,6-2,8 | 0-0,15 | 0-1 | 0-0,6 | 0-1 | 0-0,2 | 0-0,2 | 0-0,6 | 0-0,3 |
sans ajout de Mg | ajout de Mg + désulfuration | ajout de Mg (S<0.035%) | |
% de pièces sans défauts | 10 | 69 | 75 |
% de pièces "acceptables" | 40 | 28 | 25 |
% de pièces rebutées | 50 | 3 | 0 |
Claims (8)
- Procédé de fabrication d'arbres à cames en fonte à graphite lamellaire durcie par refusion superficielle selon lequel on porte la fonte à la température de fusion, on effectue une décantation du bain de fonte et l'on introduit avant la coulée un élément désoxydant dans ledit bain dans le but d'obtenir une fonte à graphite lamellaire à basse teneur d'oxygène et d'azote, caractérisé par le fait qu'on utilise une fonte dont la teneur en soufre est inférieure à 0.035% en poids, ledit désoxydant étant introduit dans une proportion de 0.001% à 0.02% en poids.
- Procédé selon la revendication 1, caractérisé en ce que la fonte à traiter possède la composition :
C % Si % P % Mn % Cr % Cu % Sn % V % Mo % Autres % 2,6-3,5 1,6-2,8 0-0,15 0-1 0-0,6 0-1 0-0,2 0-0,2 0-0,6 0-0,3 - Procédé selon l'une quelconque des revendications 1 ou 2, caractérisé par le fait que l'élément désoxydant est additionné sous forme d'un alliage dont la teneur en cedit élément est comprise entre 5 et 30% en poids.
- Procédé selon l'une quelconque des revendications 1 à 3, caractérisé par le fait que l'addition d'un élément désoxydant dans le bain de fonte est précédée d'une opération de désulfuration du bain de fonte lorsque la fonte à graphite lamellaire initiale a une teneur en soufre supérieure à 0.035% en poids.
- Procédé selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que l'élément désoxydant est constitué par du magnésium.
- Procédé selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que l'élément désoxydant est constitué par du calcium.
- Procédé selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que l'élément désoxydant est constitué par du baryum.
- Procédé selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que l'élément désoxydant est constitué par du cérium.
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 EP0616040A1 (fr) | 1994-09-21 |
EP0616040B1 true EP0616040B1 (fr) | 1999-05-19 |
Family
ID=9445147
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19940400552 Expired - Lifetime EP0616040B1 (fr) | 1993-03-19 | 1994-03-15 | Procédé de traitement d'une fonte à graphite lamellaire destinée à la fabrication des arbres à cames |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0616040B1 (fr) |
DE (1) | DE69418516T2 (fr) |
FR (1) | FR2702687B1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
DE10064248A1 (de) | 2000-12-22 | 2002-07-04 | Zf Sachs Ag | Graugusslegierung für ein Reibelement einer Reibungskupplung und Reibelement für eine Reibungskupplung |
DE102009004189B4 (de) | 2009-01-09 | 2013-07-25 | Man Truck & Bus Ag | Bauteil aus einer Gusseisenlegierung, insbesondere für Zylinderköpfe |
BRPI0922740B1 (pt) * | 2009-02-12 | 2017-12-05 | Teksid Do Brasil Ltda | Method for obtaining a high performance cast iron connection for combustion engines and filled in general. |
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 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5149573B2 (fr) * | 1971-09-09 | 1976-12-27 | ||
GB1515201A (en) * | 1976-02-10 | 1978-06-21 | British Cast Iron Res Ass | Cast iron |
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 |
-
1993
- 1993-03-19 FR FR9303182A patent/FR2702687B1/fr not_active Expired - Lifetime
-
1994
- 1994-03-15 EP EP19940400552 patent/EP0616040B1/fr not_active Expired - Lifetime
- 1994-03-15 DE DE1994618516 patent/DE69418516T2/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69418516T2 (de) | 1999-12-23 |
DE69418516D1 (de) | 1999-06-24 |
FR2702687B1 (fr) | 1995-04-28 |
FR2702687A1 (fr) | 1994-09-23 |
EP0616040A1 (fr) | 1994-09-21 |
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