EP0747154B1 - Verfahren und Vorrichtung zur Herstellung von Sinterteilen - Google Patents

Verfahren und Vorrichtung zur Herstellung von Sinterteilen Download PDF

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Publication number
EP0747154B1
EP0747154B1 EP96250118A EP96250118A EP0747154B1 EP 0747154 B1 EP0747154 B1 EP 0747154B1 EP 96250118 A EP96250118 A EP 96250118A EP 96250118 A EP96250118 A EP 96250118A EP 0747154 B1 EP0747154 B1 EP 0747154B1
Authority
EP
European Patent Office
Prior art keywords
zone
temperature
sintering
sintered parts
cooling
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
EP96250118A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0747154A1 (de
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
QMP Metal Powders 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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Application filed by BT Magnet Technologie GmbH, QMP Metal Powders GmbH filed Critical BT Magnet Technologie GmbH
Publication of EP0747154A1 publication Critical patent/EP0747154A1/de
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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 pressed moldings according to the preamble of claim 1 and a Device for performing this method.
  • EP-A-0 354 389 discloses a method in which a Sintered steel powder is pressed and sintered.
  • the sintered parts are austenitized by heating in a salt bath, rapidly cooled to a temperature of 280 to 450 ° C and in kept within this temperature range a bainitic microstructure of the structure to reach.
  • the object of the invention is to provide a method of the generic type modify that while ensuring good dynamic strength properties and good wear properties and significantly improved dimensional accuracy (tighter manufacturing tolerances) is achieved, with the procedural and the plant engineering effort should remain as low as possible.
  • a Apparatus for performing this method can be specified.
  • the invention is based on the fact that for the production of the sintered parts a known tempered steel powder is used, which is made of a pre-alloyed steel is produced, that is (with the exception of the C content) an even distribution of Has alloy components. The latter does not have to be done accordingly long-term diffusion processes during the sintering are aimed for.
  • the Previously required separate heat treatment of the sintered parts after sintering Setting the good dynamic strength properties with high at the same time Wear resistance is eliminated.
  • the setting of these properties is rather in Carried out directly during the sintering treatment.
  • the steel powder used consists of an air-hardening material. This can help the use of an oil bath which is undesirable anyway for environmental reasons To achieve a deterrent effect.
  • the carbon content of the sintered parts is usually separated in the form of Graphite added to allow the steel powder to ensure adequate Pressability remains soft enough. The diffuses during the sintering process Graphite into the powder particles that bind together.
  • Fig. 1 shows schematically, immediately after 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.
  • the device according to the invention which is electronically controlled Continuous sintering furnace is designed schematically in its simplest form shown.
  • An arrow on the left indicates that the sintered parts in a first zone will be introduced, which acts as a heating zone and in which the in the Lubricants contained in green compacts (e.g. waxes) can be evaporated.
  • This the first zone is therefore also referred to as dewaxing zone 1.
  • the actual sintering zone 2 is arranged in the direction of transport, in which the sintered parts kept at sintering temperature (at least 1000 ° C) for a sufficiently long time become. Because the sintered parts at a constant speed through the sintering zone 2 has a corresponding length on.
  • a Maintain an oxygen-free atmosphere (protective gas atmosphere).
  • the sintering zone 2 is followed by an austenitizing zone 3 in which the sintered parts first cooled and kept at austenitizing temperature.
  • a rugged cooling zone 4 which is equipped with a corresponding (not shown) Gas shower is equipped to provide sufficiently intense convective gas cooling cause.
  • the sintered parts have reached the second holding temperature, they kick into the bainitis zone 7 and become sufficient over a second holding time held at this temperature for a long time, so that it is at least 50% Can form bainite in the structure.
  • the bainitis zone 7 has a corresponding length. After sufficient bainitis, if possible before If a 95% share is reached, the sintered parts enter a final one Normal cooling zone 5, where they from the bainitization temperature to the vicinity of Be cooled to 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 choose between two different paths.
  • the arrangement of the Dewaxing zone 1 to the rugged cooling zone 4 coincides with that shown in FIG completely match. Behind the rugged cooling zone 4, the material flow direction can be set optionally. Either the sintered parts produced come on immediately a separate normal cooling zone 5a and the system can be sintered as "normal", so leave as parts not manufactured in accordance with the invention; or you are for the sequence of procedures according to the invention after leaving the Rugged cooling zone 4 via an optionally connectable transverse transport device 6, such as this is indicated by the arrows, in a parallel to the first part bainitization zone 7 arranged throughout the device.
  • the direction of transport is expediently opposite to the first part 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. So one offers such a system has a particular flexibility with regard to what is to be processed Product range.
  • it would be possible without further ado Arrangement of the normal cooling zone 5a and that of the bainitization zone 7 and The normal cooling zone 5b of the plant line formed is to be interchanged.
  • the illustrated embodiment however, has the advantage that it is a 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 fully alloyed steel powder of the composition Fe-4 Ni-0.5 Mo, to which 1% Cu and 0.6% graphite and conventional 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 took place as well as the bainitization according to the invention and a subsequent normal cooling down 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.
  • the method according to the invention allows components in the sintered state at the same time combine high toughness with high strength, which otherwise also with a separate heat treatment cannot be achieved, one clearly improved dimensional tolerance can be guaranteed.

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  • 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 Verfahren und Vorrichtung zur Herstellung von Sinterteilen Expired - Lifetime EP0747154B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=7764535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96250118A Expired - Lifetime EP0747154B1 (de) 1995-06-07 1996-06-04 Verfahren und Vorrichtung zur Herstellung von Sinterteilen

Country Status (6)

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

Families Citing this family (13)

* 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
FI115389B (fi) * 2003-03-28 2005-04-29 Metso Paper Inc Menetelmä kiekkohakkurin kulutuslevyn valmistamiseksi ja kiekkohakkurin kulutuslevy
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
DE102007061084A1 (de) 2007-12-19 2009-07-02 Federal-Mogul Sealing Systems Gmbh Metallische Flachdichtung und Herstellverfahren
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

Family Cites Families (14)

* 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
JPS5179606A (en) * 1974-11-09 1976-07-12 Toyo Kogyo Co Kotansotetsukeishudobuzaino shoketsuhoho
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
US4655853A (en) * 1982-08-09 1987-04-07 Federal-Mogul Corporation Method for making powder metal forging preforms of high-strength ferrous-base alloys
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
JPS60121253A (ja) * 1983-12-05 1985-06-28 Nissan Motor Co Ltd 球状黒鉛鋳鉄
JPS60197841A (ja) * 1984-03-19 1985-10-07 Nissan Motor Co Ltd 球状黒鉛鋳鉄
GB2197663B (en) * 1986-11-21 1990-07-11 Manganese Bronze Ltd High density sintered ferrous alloys
DE3825463A1 (de) * 1988-07-27 1990-02-01 Schwaebische Huettenwerke Gmbh Verfahren zum herstellen eines formteiles aus sintermetall und daraus hergestelltes formteil
DE4001899C1 (es) * 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

Also Published As

Publication number Publication date
DE19521941C1 (de) 1996-10-02
JPH093587A (ja) 1997-01-07
EP0747154A1 (de) 1996-12-11
ATE199130T1 (de) 2001-02-15
ES2153935T3 (es) 2001-03-16
DE59606428D1 (de) 2001-03-22
JP3679508B2 (ja) 2005-08-03
US5628045A (en) 1997-05-06

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