EP0279300A2 - Fonte pour la fabrication de tambours de frein - Google Patents

Fonte pour la fabrication de tambours de frein Download PDF

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Publication number
EP0279300A2
EP0279300A2 EP88101722A EP88101722A EP0279300A2 EP 0279300 A2 EP0279300 A2 EP 0279300A2 EP 88101722 A EP88101722 A EP 88101722A EP 88101722 A EP88101722 A EP 88101722A EP 0279300 A2 EP0279300 A2 EP 0279300A2
Authority
EP
European Patent Office
Prior art keywords
cast iron
less
brake
molybdenum
manganese
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
EP88101722A
Other languages
German (de)
English (en)
Other versions
EP0279300B1 (fr
EP0279300A3 (en
Inventor
Horst Metzler
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.)
Schwaebische Huettenwerke Automotive GmbH
Original Assignee
Schwaebische Huettenwerke Automotive 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6320990&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0279300(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Schwaebische Huettenwerke Automotive GmbH filed Critical Schwaebische Huettenwerke Automotive GmbH
Publication of EP0279300A2 publication Critical patent/EP0279300A2/fr
Publication of EP0279300A3 publication Critical patent/EP0279300A3/de
Application granted granted Critical
Publication of EP0279300B1 publication Critical patent/EP0279300B1/fr
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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B5/00Making pig-iron in the blast furnace
    • C21B5/02Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/06Cast-iron alloys containing chromium

Definitions

  • the invention relates to a cast iron for the production of brake drums, massive and ventilated brake discs and other brake bodies with an alloy of over 3.6% carbon 0.6-0.9% manganese 1.8 - 2.5% silicon less than 0.1% phosphorus less than 0.12% sulfur and with minor components of chrome, molybdenum and copper, the cast iron has a pearlitic structure.
  • a cast iron with this chemical composition is described in DE-OS 33 05 184. Due to the development of new asbestos-free brake pads, it became necessary to use cast iron alloys for brake drums, brake disks and the like that can withstand higher temperatures. To this end, the general tendency among users has hitherto been to use highly heat-resistant types of iron with a higher carbon content, which, however, have disadvantages, particularly with regard to a coarse structure and strength.
  • the present invention is therefore based on the object of providing a cast iron of the type mentioned at the outset, which has the lowest possible ferrite content with high tensile strength.
  • this object is achieved by the combination of the following features, namely a pearlitic basic structure with a maximum of 5% ferrite content and a tensile strength of at least 200 N / mm2 with the following chemical composition: Carbon 3.62 - 3.68% Silicon max. 2.10% Manganese 0.70 - 0.85% Phosphorus less than 0.080% Sulfur less than 0.095% Chromium 0.18 - 0.25% Molybdenum 0.30 - 0.45% Copper 0.30 - 0.45%.
  • the specified alloy components such as chromium, molybdenum, manganese and copper, determined in long tests, achieve a tensile strength of at least 200 N / mm2.
  • molybdenum In combination with chrome, molybdenum also ensures a high core strength of the structure and, as an alloy component, gives good heat resistance with changing thermal loads on the brake discs.
  • the carbon content up to max. 3.68% is achieved by melting in the cupola furnace at the C level of 3.4 - 3.45%.
  • the remaining 0.25 - 0.30% are introduced into the ladle using electrode graphite when tapping the liquid iron using a special vaccination process.
  • the resulting optimal inoculation effect gives rise to A-graphite of size 3-4. It was surprisingly found that carbide deposits in the pearlitic structure despite their alloying elements such as chromium and molybdenum do not occur.
  • the high carbon content causes a lot of graphite excretion with its excellent thermal conductivity and high thermal resistance properties for brakes. This means that the heat build-up on the brake friction rings can be spread over the entire disc in a very short time, which significantly reduces thermal stresses and fire cracks.
  • Sulfur is used up to a maximum of 0.095% to achieve the manganese Sulfur ratio used, but should not exceed the specified value.
  • the cast iron according to the invention has a fine structure and the graphite lamellae become somewhat shorter, as a result of which the higher strength according to the invention can be achieved.
  • a high proportion of carbon counteracts this, i.e. causes a reduction in strength and a coarser structure.
  • a high carbon content is a cost factor.
  • a low carbon content can be used, in the range of 3.62 - 3.68%, if this is done with the other alloy components combined. In this case, the desired high strength values and heat resistance are achieved.
  • the parts to be treated are brought to a temperature of 650-720 degrees C. in a heating-up time of 180 minutes and then kept at this temperature for 30 minutes, after which slow cooling in the annealing furnace to 250 degrees C.
  • the parts Before annealing, the parts should be pre-processed, namely roughed.
  • the cast skin of the friction surface and the inside of the pot should be removed approx. 1.5 mm.
  • the subsequent post-treatment method according to the invention eliminates both internal stresses generated during the cooling process and stresses caused by the machining. It is also essential that, due to the increased strength achieved by the alloy components in a certain area, higher residual stresses can arise, which can be eliminated by the heat treatment process according to the invention.
  • the longer heating time specified for the heating of the parts to be treated prevents their warping.
  • the cooling down after the specified holding time should in any case be carried out slowly so that no new tensions arise. This can e.g. can be achieved in a simple manner by switching off the annealing furnace, the parts remaining in the slowly cooling annealing furnace for a relatively long time.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Braking Arrangements (AREA)
  • Heat Treatment Of Articles (AREA)
EP88101722A 1987-02-14 1988-02-06 Fonte pour la fabrication de tambours de frein Expired - Lifetime EP0279300B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3704679 1987-02-14
DE19873704679 DE3704679A1 (de) 1987-02-14 1987-02-14 Gusseisen zur fertigung von bremstrommeln

Publications (3)

Publication Number Publication Date
EP0279300A2 true EP0279300A2 (fr) 1988-08-24
EP0279300A3 EP0279300A3 (en) 1988-09-14
EP0279300B1 EP0279300B1 (fr) 1991-05-15

Family

ID=6320990

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88101722A Expired - Lifetime EP0279300B1 (fr) 1987-02-14 1988-02-06 Fonte pour la fabrication de tambours de frein

Country Status (5)

Country Link
US (2) US4948437A (fr)
EP (1) EP0279300B1 (fr)
KR (1) KR960005599B1 (fr)
DE (2) DE3704679A1 (fr)
ES (1) ES2022479B3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0746635A4 (fr) * 1992-09-25 1995-07-19 Detroit Diesel Corp Fonte grise en alliage presentant une resistance elevee a la fatigue thermique et une bonne aptitude a l'usinage
EP0778355A1 (fr) * 1995-12-07 1997-06-11 Mercedes-Benz Ag Composition optimalisée de moulages en fonte grise lamellaire pour disques de freinage de véhicules utilitaires
WO2007115772A1 (fr) * 2006-04-04 2007-10-18 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Disque de frein d'un frein a disque
DE102004028902B4 (de) * 2004-06-15 2017-11-09 Robert Bosch Gmbh Bremsscheibe

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2079060A1 (fr) * 1991-10-16 1993-04-17 K-H Corporation Tambour de frein ou rotor precontraint
US5352305A (en) * 1991-10-16 1994-10-04 Dayton Walther Corporation Prestressed brake drum or rotor
SE504536C2 (sv) * 1994-09-09 1997-03-03 Volvo Ab Perlitiskt gråjärn samt bromskomponenter tillverkade av gråjärnet
DE19525863A1 (de) * 1995-07-15 1997-01-16 Ae Goetze Gmbh Gleitringdichtung für die Laufwerke von Gleiskettenfahrzeugen
DE19747111A1 (de) 1997-10-24 1999-05-12 Knorr Bremse Systeme Bremsscheibe für Scheibenbremsen
DE19929390B4 (de) 1999-06-28 2004-05-06 Otto Sauer Achsenfabrik Keilberg Bremsscheibenanordnung
DE29924178U1 (de) 1999-06-28 2002-04-04 Otto Sauer Achsenfabrik Keilberg, 63856 Bessenbach Bremsscheibe
US7163594B1 (en) * 2003-10-10 2007-01-16 Gunite Corporation High tensile strength gray iron alloy
US7083685B1 (en) 2005-07-15 2006-08-01 Hino Motors, Ltd. Gray cast iron member
ITBS20100196A1 (it) * 2010-12-02 2012-06-03 Freni Brembo Spa Ghisa, in particolare per componenti di freni a disco

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2214652A (en) * 1940-06-28 1940-09-10 Perfect Circle Co Iron alloy
DE716104C (de) * 1939-03-14 1942-01-13 Goetzewerke Auf Verschleiss beanspruchter Dichtungsring, vorzugsweise Kolbenring
SU329237A1 (fr) * 1970-07-28 1972-02-09
DE3305184A1 (de) * 1983-02-15 1984-08-23 Buderus Ag, 6330 Wetzlar Gusseisen zum erstellen von bremsenkoerpern

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53137814A (en) * 1977-05-09 1978-12-01 Hitachi Metals Ltd Method of producing pearlite spheroidal graphite cast iron
JPS6024703A (ja) * 1983-07-20 1985-02-07 Mitsubishi Electric Corp モノパルスアンテナ
JPS60247036A (ja) * 1984-05-22 1985-12-06 Mitsui Eng & Shipbuild Co Ltd Cv鋳鉄製シリンダライナ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE716104C (de) * 1939-03-14 1942-01-13 Goetzewerke Auf Verschleiss beanspruchter Dichtungsring, vorzugsweise Kolbenring
US2214652A (en) * 1940-06-28 1940-09-10 Perfect Circle Co Iron alloy
SU329237A1 (fr) * 1970-07-28 1972-02-09
DE3305184A1 (de) * 1983-02-15 1984-08-23 Buderus Ag, 6330 Wetzlar Gusseisen zum erstellen von bremsenkoerpern

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0746635A4 (fr) * 1992-09-25 1995-07-19 Detroit Diesel Corp Fonte grise en alliage presentant une resistance elevee a la fatigue thermique et une bonne aptitude a l'usinage
EP0746635A1 (fr) * 1992-09-25 1996-12-11 Detroit Diesel Corporation Fonte grise en alliage presentant une resistance elevee a la fatigue thermique et une bonne aptitude a l'usinage
EP0778355A1 (fr) * 1995-12-07 1997-06-11 Mercedes-Benz Ag Composition optimalisée de moulages en fonte grise lamellaire pour disques de freinage de véhicules utilitaires
US5894010A (en) * 1995-12-07 1999-04-13 Mercedes-Benz Ag Optimized gray cast iron plate alloy for utility vehicle brake disks
DE102004028902B4 (de) * 2004-06-15 2017-11-09 Robert Bosch Gmbh Bremsscheibe
WO2007115772A1 (fr) * 2006-04-04 2007-10-18 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Disque de frein d'un frein a disque

Also Published As

Publication number Publication date
ES2022479B3 (es) 1991-12-01
EP0279300B1 (fr) 1991-05-15
DE3862767D1 (de) 1991-06-20
KR880010138A (ko) 1988-10-07
KR960005599B1 (ko) 1996-04-26
EP0279300A3 (en) 1988-09-14
US5032194A (en) 1991-07-16
DE3704679C2 (fr) 1989-11-23
DE3704679A1 (de) 1988-08-25
US4948437A (en) 1990-08-14

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