EP0279300B1 - Gusseisen zur Fertigung von Bremstrommeln - Google Patents

Gusseisen zur Fertigung von Bremstrommeln Download PDF

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Publication number
EP0279300B1
EP0279300B1 EP88101722A EP88101722A EP0279300B1 EP 0279300 B1 EP0279300 B1 EP 0279300B1 EP 88101722 A EP88101722 A EP 88101722A EP 88101722 A EP88101722 A EP 88101722A EP 0279300 B1 EP0279300 B1 EP 0279300B1
Authority
EP
European Patent Office
Prior art keywords
cast iron
brake
manufacture
brake drums
strength
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
Application number
EP88101722A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0279300A3 (en
EP0279300A2 (de
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(B1) "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/de
Publication of EP0279300A3 publication Critical patent/EP0279300A3/de
Application granted granted Critical
Publication of EP0279300B1 publication Critical patent/EP0279300B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium

Definitions

  • From DE-OS 3305 184 is a cast iron for the production of brake drums of solid and ventilated brake discs and other brake bodies with an alloy of 3.7-3.9% carbon 0.6-0.9% manganese 1.8 - 2.5% silicon less than 0.1% phosphorus less than 0.12% sulfur, known, the cast iron has a pearlitic structure.
  • 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:
  • 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 chromium, 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 by 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 to achieve a maximum of 0.095% 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 determined 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 process according to the invention eliminates both internal stresses generated during the cooling process and stresses caused by the processing. 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 post-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 Gusseisen zur Fertigung von Bremstrommeln Expired - Lifetime EP0279300B1 (de)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=6320990

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88101722A Expired - Lifetime EP0279300B1 (de) 1987-02-14 1988-02-06 Gusseisen zur Fertigung von Bremstrommeln

Country Status (5)

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

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5352305A (en) * 1991-10-16 1994-10-04 Dayton Walther Corporation Prestressed brake drum or rotor
CA2079060A1 (en) * 1991-10-16 1993-04-17 K-H Corporation Prestressed brake drum or rotor
US5242510A (en) * 1992-09-25 1993-09-07 Detroit Diesel Corporation Alloyed grey iron having high thermal fatigue resistance and good machinability
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
DE19545611C1 (de) * 1995-12-07 1997-03-13 Daimler Benz Ag Optimierte Lamellen-Graugußlegierung für Bremsscheiben von Nutzfahrzeug
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
US7163594B1 (en) * 2003-10-10 2007-01-16 Gunite Corporation High tensile strength gray iron alloy
DE102004028902B4 (de) * 2004-06-15 2017-11-09 Robert Bosch Gmbh Bremsscheibe
US7083685B1 (en) 2005-07-15 2006-08-01 Hino Motors, Ltd. Gray cast iron member
DE202006005437U1 (de) * 2006-04-04 2006-06-08 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Bremsscheibe einer Scheibenbremse
ITBS20100196A1 (it) * 2010-12-02 2012-06-03 Freni Brembo Spa Ghisa, in particolare per componenti di freni a disco

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3305184A1 (de) * 1983-02-15 1984-08-23 Buderus Ag, 6330 Wetzlar Gusseisen zum erstellen von bremsenkoerpern

Family Cites Families (6)

* 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 (ko) * 1970-07-28 1972-02-09
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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3305184A1 (de) * 1983-02-15 1984-08-23 Buderus Ag, 6330 Wetzlar Gusseisen zum erstellen von bremsenkoerpern

Also Published As

Publication number Publication date
KR960005599B1 (ko) 1996-04-26
DE3862767D1 (de) 1991-06-20
ES2022479B3 (es) 1991-12-01
KR880010138A (ko) 1988-10-07
DE3704679C2 (ko) 1989-11-23
EP0279300A3 (en) 1988-09-14
US5032194A (en) 1991-07-16
DE3704679A1 (de) 1988-08-25
US4948437A (en) 1990-08-14
EP0279300A2 (de) 1988-08-24

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