EP0747154A1 - Procédé et appareil pour la fabrication des pièces frittées - Google Patents

Procédé et appareil pour la fabrication des pièces frittées Download PDF

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Publication number
EP0747154A1
EP0747154A1 EP96250118A EP96250118A EP0747154A1 EP 0747154 A1 EP0747154 A1 EP 0747154A1 EP 96250118 A EP96250118 A EP 96250118A EP 96250118 A EP96250118 A EP 96250118A EP 0747154 A1 EP0747154 A1 EP 0747154A1
Authority
EP
European Patent Office
Prior art keywords
zone
temperature
sintering
cooling
sintered parts
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
EP96250118A
Other languages
German (de)
English (en)
Other versions
EP0747154B1 (fr
Inventor
Karl-Heinz Lindner
Rudolf Schneider
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.)
Sinterwerke Herne GmbH
QMP Metal Powders GmbH
Original Assignee
BT Magnet Technologie GmbH
Mannesmann AG
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
Family has litigation
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Application filed by BT Magnet Technologie GmbH, Mannesmann AG filed Critical BT Magnet Technologie GmbH
Publication of EP0747154A1 publication Critical patent/EP0747154A1/fr
Application granted granted Critical
Publication of EP0747154B1 publication Critical patent/EP0747154B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy

Definitions

  • the invention relates to a method for producing sintered parts with high wear resistance and at the same time good dynamic strength properties from pressed molded articles according to the preamble of claim 1 and a device for performing this method.
  • Such a manufacturing process provides components with good static (tensile strength, hardness, wear resistance) and at the same time also good dynamic strength properties.
  • the dimensional accuracy and its uniformity occasionally leave something to be desired: the achievable tolerance class is approximately IT10.
  • the object of the invention is to modify a method of the generic type in such a way that, while ensuring good dynamic strength properties and at the same time good wear properties, a significantly improved dimensional accuracy (tighter manufacturing tolerances) is achieved, the procedural and the system engineering outlay being kept as low as possible.
  • a device for performing this method is to be specified.
  • a device for carrying out the method according to the invention has the features of patent claim 9 and is advantageously characterized by those in subclaims 10 to 12 specified features can be further configured.
  • the invention is based on the fact that for the production of the sintered parts a hardened and tempered steel powder is used which is made from a fully alloyed steel, that is (with the exception of the C content) has a uniform distribution of the alloy components. The latter therefore does not have to be striven for by means of diffusion processes correspondingly extended over time during the sintering.
  • the previously required separate heat treatment of the sintered parts after sintering to set the good dynamic strength properties with high wear resistance is eliminated. Rather, these properties are set directly in the course of the sintering treatment.
  • the steel powder used consists of an air-hardening material.
  • an oil bath which is undesirable for environmental protection reasons, in order to achieve a deterrent effect can be dispensed with.
  • the carbon content of the sintered parts is added in the usual way separately in the form of graphite, so that the steel powder remains soft enough to ensure sufficient compressibility. During the sintering process, the graphite diffuses into the interconnected powder particles.
  • Fig. 1 shows schematically, in the immediate connection to the sintering (section a) to cool the sintered parts from the sintering temperature to a first holding temperature which is in a temperature range from Ar 3 to a maximum of 150 ° C. above Ar 3 .
  • the cooling (section b) from the sintering temperature to the first holding temperature is expediently carried out at a cooling rate of 0.5-1.5 ° C./s.
  • the sintered parts are held at the first holding temperature for about 5 to 25 minutes (first holding time, section c). This results in a smaller austenite grain size.
  • the first holding temperature in a range of at most 50-100 ° C. above Ar 3 .
  • a useful duration of the first stopping time is 10-20 minutes.
  • section d convective gas cooling leads to accelerated cooling (section d) to a second holding temperature.
  • a cooling rate in the range of 3 - 6 ° C / s is recommended for this.
  • This second holding temperature is selected on the basis of the ZTU diagram associated with the respective material in such a way that the area of ferrite formation is avoided and a bainitic structure begins to form.
  • the holding time at this second holding temperature (section e) is extended at least until a structure component of the bainite of at least 50% has set in. However, a complete transformation of the structure into bainite is generally not desirable. With a maximum of 95% bainite, the holding at the second holding temperature should expediently be ended at the latest. A proportion of bainite in the order of 60-80% has proven to be particularly advantageous.
  • the sintered parts are then cooled in the usual way to room temperature (normal cooling, section f).
  • the procedure according to the invention ensures particularly good part quality. This not only results in a comparatively high dimensional accuracy, but the tolerances that occur are significantly narrower than in the conventional method of production.
  • the quality class IT8 can now be achieved. This is all the more surprising since it is even possible to completely do without a separate calibration process. This makes a complete more complex Work step saved. Furthermore, there is no need for energy and handling for a separate heat treatment process.
  • the device according to the invention which is designed as an electronically controlled continuous sintering furnace, is shown schematically in its simplest form.
  • An arrow on the left-hand side indicates that the sintered parts are introduced into a first zone, which functions as a heating zone and in which the lubricants (e.g. waxes) contained in the green compacts are evaporated.
  • This first zone is therefore also referred to as dewaxing zone 1.
  • the actual sintering zone 2 in which the sintered parts are kept at the sintering temperature (at least 1000 ° C.) for a sufficiently long time. Since the sintered parts are moved through the entire system at a constant speed, the sintering zone 2 has a corresponding length.
  • an oxygen-free atmosphere (protective gas atmosphere) is maintained in the entire system.
  • an austenitizing zone 3 in which the sintered parts are first cooled and kept at the austenitizing temperature.
  • a rugged cooling zone 4 which is equipped with a corresponding gas shower (not shown) in order to bring about a sufficiently intensive convective gas cooling.
  • the sintered parts have reached the second holding temperature, they enter the bainitization zone 7 and are kept at this temperature for a sufficiently long time so that a bainite fraction of at least 50% can form in the structure.
  • the bainitis riveting zone 7 has a corresponding length. After a sufficient bainitization time, if possible before reaching a 95% share, the sintered parts enter a final normal cooling zone 5, where they are cooled from the bainitization temperature to near room temperature.
  • FIG. 3 shows the diagram of a system modified compared to FIG. 2, which differs in that the green compacts used in the device can optionally pass through two different paths.
  • the arrangement from the dewaxing zone 1 to the rugged cooling zone 4 is completely the same as that shown in FIG.
  • the material flow direction can be optionally set behind the rugged cooling zone 4.
  • the direction of transport is expediently opposite to the first part of the device.
  • This is followed by a normal cooling zone 5b, in which the parts treated according to the invention are cooled to room temperature.
  • This modified device thus has two normal cooling zones.
  • Such a system thus offers particular flexibility with regard to the range of products to be processed.
  • the illustrated embodiment has the advantage that it has a comparatively short overall length.
  • the dimensional accuracy corresponded to the tolerance class IT9.
  • Compressed bodies of the same type as in the previous example were produced from a completely alloyed steel powder of the composition Fe-4 Ni-0.5 Mo, to which 1% Cu and 0.6% graphite and customary lubricants were added.
  • the sintering was carried out at a temperature of 1120 ° C. over a period of 30 min in an endogas atmosphere with controlled C potential.
  • a rugged cooling with a cooling rate of 3 ° C / s and the bainitization according to the invention followed by a normal cooling to room temperature.
  • a bainitic structure emerged in the components with the following properties: tensile strenght 750 - 800 N / mm 2 Hardness level 350 - 450 HV1 Elongation at break A3 until 6 %
  • the dimensional accuracy of the parts produced according to the invention was also significantly better. It corresponded to the tolerance class IT8.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
EP96250118A 1995-06-07 1996-06-04 Procédé et appareil pour la fabrication des pièces frittées Expired - Lifetime EP0747154B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19521941A DE19521941C1 (de) 1995-06-07 1995-06-07 Verfahren und Vorrichtung zur Herstellung von Sinterteilen
DE19521941 1995-06-07

Publications (2)

Publication Number Publication Date
EP0747154A1 true EP0747154A1 (fr) 1996-12-11
EP0747154B1 EP0747154B1 (fr) 2001-02-14

Family

ID=7764535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96250118A Expired - Lifetime EP0747154B1 (fr) 1995-06-07 1996-06-04 Procédé et appareil pour la fabrication des pièces frittées

Country Status (6)

Country Link
US (1) US5628045A (fr)
EP (1) EP0747154B1 (fr)
JP (1) JP3679508B2 (fr)
AT (1) ATE199130T1 (fr)
DE (2) DE19521941C1 (fr)
ES (1) ES2153935T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007061084A1 (de) 2007-12-19 2009-07-02 Federal-Mogul Sealing Systems Gmbh Metallische Flachdichtung und Herstellverfahren

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19738919C1 (de) 1997-09-05 1999-04-29 Maxon Motor Gmbh Verfahren zur Herstellung eines Gleitlagers und Gleitlager
DE19744226A1 (de) * 1997-10-07 1999-07-29 Bt Magnet Tech Gmbh Verfahren zur Herstellung eines Ritzels mit Bund und Verzahnung
US6358298B1 (en) 1999-07-30 2002-03-19 Quebec Metal Powders Limited Iron-graphite composite powders and sintered articles produced therefrom
DE19963973C1 (de) * 1999-12-31 2001-05-31 Bosch Gmbh Robert Verfahren zum Bainitisieren von Stahlteilen
DE10045290A1 (de) * 2000-09-13 2002-03-21 Mahle Ventiltrieb Gmbh Verfahren zur Herstellung eines Metallsinterteiles
JP3698409B2 (ja) * 2000-10-25 2005-09-21 本田技研工業株式会社 焼結スプロケット
US6630101B2 (en) 2001-08-16 2003-10-07 Keystone Investment Corporation Method for producing powder metal gears
US6658260B2 (en) 2001-09-05 2003-12-02 Telecommunication Systems, Inc. Inter-carrier short messaging service providing phone number only experience
SE0201824D0 (sv) * 2002-06-14 2002-06-14 Hoeganaes Ab Pre-alloyed iron based powder
US20050095164A1 (en) * 2003-03-28 2005-05-05 Metso Paper, Inc. Method for manufacturing a wear plate of a disc chipper and wear plate of a disc chipper
FI115389B (fi) * 2003-03-28 2005-04-29 Metso Paper Inc Menetelmä kiekkohakkurin kulutuslevyn valmistamiseksi ja kiekkohakkurin kulutuslevy
JP6273519B2 (ja) * 2014-03-26 2018-02-07 住友電工焼結合金株式会社 粉末成形体の焼結方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2550428A1 (de) * 1974-11-09 1976-05-20 Toyo Kogyo Co Gleitteil sowie sinterverfahren zu dessen herstellung
GB1590113A (en) * 1978-03-21 1981-05-28 Ransome Hoffmann Pollard Rolling element bearings
DE3142359A1 (de) * 1981-10-26 1983-05-05 Horst Dipl.-Phys. Dr. 6000 Frankfurt Mühlberger Verfahren und vorrichtung zur waermebehandlung von werkstuecken
JPS58217601A (ja) * 1982-06-14 1983-12-17 Kawasaki Steel Corp 高強度焼結材料の製造方法
JPS59177325A (ja) * 1983-03-28 1984-10-08 Nippon Steel Corp 高強度熱延ベイナイト鋼板の製造方法
EP0144907A2 (fr) * 1983-12-05 1985-06-19 Nissan Motor Co., Ltd. Procédé pour la fabrication de pièces de fonte à graphite sphéroidal par trempe bainitique
DE3509709A1 (de) * 1984-03-19 1985-09-26 Nissan Motor Co., Ltd., Yokohama, Kanagawa Verfahren zur herstellung eines zwischenstufenvergueteten gusseisenkoerpers mit kugelgraphit und der dabei erhaltene koerper
EP0354389A1 (fr) * 1988-07-27 1990-02-14 Schwäbische Hüttenwerke Gesellschaft mit beschränkter Haftung Procédé pour la fabrication de pièces d'acier fritté et pièces ainsi obtenues

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5132080A (en) * 1944-11-28 1992-07-21 Inco Limited Production of articles from powdered metals
US4655853A (en) * 1982-08-09 1987-04-07 Federal-Mogul Corporation Method for making powder metal forging preforms of high-strength ferrous-base alloys
GB2197663B (en) * 1986-11-21 1990-07-11 Manganese Bronze Ltd High density sintered ferrous alloys
DE4001899C1 (fr) * 1990-01-19 1991-07-25 Mannesmann Ag, 4000 Duesseldorf, De
US5074533A (en) * 1990-04-06 1991-12-24 Monroe Auto Equipment Company Endothermic furnace
JP2601069B2 (ja) * 1991-08-08 1997-04-16 株式会社村田製作所 セラミック成形体の焼成方法及び焼成装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2550428A1 (de) * 1974-11-09 1976-05-20 Toyo Kogyo Co Gleitteil sowie sinterverfahren zu dessen herstellung
GB1590113A (en) * 1978-03-21 1981-05-28 Ransome Hoffmann Pollard Rolling element bearings
DE3142359A1 (de) * 1981-10-26 1983-05-05 Horst Dipl.-Phys. Dr. 6000 Frankfurt Mühlberger Verfahren und vorrichtung zur waermebehandlung von werkstuecken
JPS58217601A (ja) * 1982-06-14 1983-12-17 Kawasaki Steel Corp 高強度焼結材料の製造方法
JPS59177325A (ja) * 1983-03-28 1984-10-08 Nippon Steel Corp 高強度熱延ベイナイト鋼板の製造方法
EP0144907A2 (fr) * 1983-12-05 1985-06-19 Nissan Motor Co., Ltd. Procédé pour la fabrication de pièces de fonte à graphite sphéroidal par trempe bainitique
DE3509709A1 (de) * 1984-03-19 1985-09-26 Nissan Motor Co., Ltd., Yokohama, Kanagawa Verfahren zur herstellung eines zwischenstufenvergueteten gusseisenkoerpers mit kugelgraphit und der dabei erhaltene koerper
EP0354389A1 (fr) * 1988-07-27 1990-02-14 Schwäbische Hüttenwerke Gesellschaft mit beschränkter Haftung Procédé pour la fabrication de pièces d'acier fritté et pièces ainsi obtenues

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
FARGUES J: "TRAITEMENT DE TREMPE ETAGEE BAINITIQUE DES FONTES", FONDERIE, FONDEUR D'AUJOURD'HUI, no. 106, 1 June 1991 (1991-06-01), pages 31 - 39, XP000228780 *
PATENT ABSTRACTS OF JAPAN vol. 008, no. 069 (M - 286) 31 March 1984 (1984-03-31) *
PATENT ABSTRACTS OF JAPAN vol. 009, no. 032 (C - 265) 9 February 1985 (1985-02-09) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007061084A1 (de) 2007-12-19 2009-07-02 Federal-Mogul Sealing Systems Gmbh Metallische Flachdichtung und Herstellverfahren

Also Published As

Publication number Publication date
EP0747154B1 (fr) 2001-02-14
JPH093587A (ja) 1997-01-07
JP3679508B2 (ja) 2005-08-03
US5628045A (en) 1997-05-06
ES2153935T3 (es) 2001-03-16
DE59606428D1 (de) 2001-03-22
ATE199130T1 (de) 2001-02-15
DE19521941C1 (de) 1996-10-02

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