EP0279300A2 - Fonte pour la fabrication de tambours de frein - Google Patents
Fonte pour la fabrication de tambours de frein Download PDFInfo
- 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
Links
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 9
- 239000011733 molybdenum Substances 0.000 claims abstract description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 239000010949 copper Substances 0.000 claims abstract description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 239000011572 manganese Substances 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 239000011574 phosphorus Substances 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 239000010703 silicon Substances 0.000 claims abstract description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 239000011651 chromium Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims abstract description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 239000005864 Sulphur Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 230000035882 stress Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910001060 Gray iron Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000029142 excretion Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 238000002255 vaccination Methods 0.000 description 1
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
- 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)
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)
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)
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)
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)
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 |
-
1987
- 1987-02-14 DE DE19873704679 patent/DE3704679A1/de active Granted
-
1988
- 1988-02-06 DE DE8888101722T patent/DE3862767D1/de not_active Expired - Lifetime
- 1988-02-06 EP EP88101722A patent/EP0279300B1/fr not_active Expired - Lifetime
- 1988-02-06 ES ES88101722T patent/ES2022479B3/es not_active Expired - Lifetime
- 1988-02-11 US US07/155,040 patent/US4948437A/en not_active Expired - Lifetime
- 1988-02-13 KR KR1019880001423A patent/KR960005599B1/ko not_active IP Right Cessation
-
1990
- 1990-05-25 US US07/529,141 patent/US5032194A/en not_active Expired - Lifetime
Patent Citations (4)
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)
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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