EP0283464B1 - Verfahren zum Herstellen eines Sinterkörpers - Google Patents

Verfahren zum Herstellen eines Sinterkörpers Download PDF

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Publication number
EP0283464B1
EP0283464B1 EP88890044A EP88890044A EP0283464B1 EP 0283464 B1 EP0283464 B1 EP 0283464B1 EP 88890044 A EP88890044 A EP 88890044A EP 88890044 A EP88890044 A EP 88890044A EP 0283464 B1 EP0283464 B1 EP 0283464B1
Authority
EP
European Patent Office
Prior art keywords
wear layer
metal powder
sintered
compact
rough
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
EP88890044A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0283464A2 (de
EP0283464A3 (en
Inventor
Friedrich Filz
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.)
Miba Sintermetall GmbH
Original Assignee
Miba Sintermetall 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
Application filed by Miba Sintermetall GmbH filed Critical Miba Sintermetall GmbH
Publication of EP0283464A2 publication Critical patent/EP0283464A2/de
Publication of EP0283464A3 publication Critical patent/EP0283464A3/de
Application granted granted Critical
Publication of EP0283464B1 publication Critical patent/EP0283464B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools

Definitions

  • the invention relates to a method for producing a sintered body with at least one molybdenum-containing wear layer, wherein a low-alloy iron powder forming the later base body with a metal powder layer resulting in the later wear layer from a carbon-free mixture of unalloyed iron and unalloyed molybdenum in a common form Molded body is pressed, which is then sintered.
  • rocker arms which are used to transmit the cam movement of a camshaft to a valve, for example an internal combustion engine
  • the end face interacting with the cams is exposed to considerable stress, which leads to corresponding wear.
  • the invention is therefore based on the object of specifying a method by means of which sintered bodies can be provided with a molybdenum-containing wear layer, which corresponds to particularly high requirements with regard to wear resistance and compliance with low manufacturing tolerances, as are particularly required for rocker arms for valve actuation of internal combustion engines.
  • the invention solves the problem in that the metal powder for the later wear layer is compressed into a pre-compact with the iron powder for the later base body before the mold is filled in, and that when the metal powder mixture for the later wear layer is compacted into a pre-compact, a profiling is pressed into the surface of the base body (see claim 1).
  • Preferred embodiments of the invention can be found in claims 2 and 3.
  • the outer shape of the pre-compact can no longer be adversely affected, even without a synthetic resin bond, by filling the iron powder for the later base body into the common form already containing the pre-compact and by subsequently pressing the two metal powder layers together at the boundary layer between the pre-compact and the metal powder layer for the base body, there can be no mixing of the metal powder of the two layers impairing the wear resistance of the wear layer.
  • pre-compressing the later wear layer different internal friction conditions of the two metal powder layers can easily be taken into account and uniform densities of both layers can be achieved.
  • the profiling should be pressed into the surface of the preform with a profile thickness of at least 0.1 mm. The design of the profile depends on the respective requirements and can be chosen accordingly.
  • the surface of the pre-compact is profiled in two directions, which are preferably at right angles to one another, there is no preferred direction for the transmission of shear stresses between the wear layer and the sintered body, as would be the case with a uniaxial profiling.
  • the carbon-free metal powder mixture for the later wear layer outside the common shape for the sintered body and the wear layer is compacted into a pre-compact, it may be advantageous for easier handling of the pre-compact to subject this pre-compact to pre-sintering, for example at approx. 700 ° C. to increase the dimensional stability of the pre-compact. This measure will therefore be particularly recommended for comparatively thin wear layers.
  • the metal powder mixture 3 for the later wear layer is initially in its own mold 4 compacted to a preform 5, as indicated in FIGS. 1 to 3.
  • a carbon-free mixture 3 of, for example, 65 to 80% by weight of unalloyed iron and 35 to 20% by weight of unalloyed molybdenum can be used for the wear layer 2.
  • This metal powder mixture 3 is compressed with the help of the punch 6 of the molding press 4 to at least 50% of the theoretical density of the powder mixture and ejected as a pre-compact 5 by moving the counter tool 7 for the punch 6 according to FIG. 3 out of the mold 4.
  • the pre-compact 5 can then be subjected to a pre-sintering at approx. 700 ° C. before it is processed further. However, this presintering can be omitted if the shape of the preform 5 is sufficient for handling.
  • the surface of the preform 5 facing the sintered body 1 is profiled, with a profile depth of at least 0.1 mm.
  • This profile 8, which is embossed into the surface via the press ram 6, can advantageously consist of two sets of profile grooves intersecting at right angles, as is indicated in FIGS. 5 and 7.
  • the preform 5 is then placed in a common mold 9 for the wear layer and the sintered body, as shown in FIG. 8.
  • the mold is filled with a low-alloy iron powder 10 (Fig. 9), after which the preform 5 is pressed with the iron powder 10 by pressing the punch 11 with a pressure of at least 2 t / cm2 to a shaped body .
  • the pressing is shown.
  • the molded body can then be pre-sintered in the mold 9, calibrated at a pressure above 2 t / cm 2 and finish-sintered at a temperature up to 1350 ° C., after which the workpiece can be ejected via the counter tool 12 (FIG. 11).
  • the wear layer 2 can then be carburized on the end face of the sintered body 1 that is at risk or hardened by quenching and tempering.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP88890044A 1987-03-16 1988-03-07 Verfahren zum Herstellen eines Sinterkörpers Expired - Lifetime EP0283464B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0061387A AT388523B (de) 1987-03-16 1987-03-16 Verfahren zum herstellen eines sinterkoerpers mit wenigstens einer molybdaenhaltigen verschleissschicht
AT613/87 1987-03-16

Publications (3)

Publication Number Publication Date
EP0283464A2 EP0283464A2 (de) 1988-09-21
EP0283464A3 EP0283464A3 (en) 1989-05-10
EP0283464B1 true EP0283464B1 (de) 1993-05-26

Family

ID=3495231

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88890044A Expired - Lifetime EP0283464B1 (de) 1987-03-16 1988-03-07 Verfahren zum Herstellen eines Sinterkörpers

Country Status (7)

Country Link
US (1) US4839138A (enrdf_load_stackoverflow)
EP (1) EP0283464B1 (enrdf_load_stackoverflow)
JP (1) JPS63247304A (enrdf_load_stackoverflow)
AT (1) AT388523B (enrdf_load_stackoverflow)
CA (1) CA1282914C (enrdf_load_stackoverflow)
DE (1) DE3881247D1 (enrdf_load_stackoverflow)
ES (1) ES2041340T3 (enrdf_load_stackoverflow)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03274205A (ja) * 1990-03-26 1991-12-05 Isuzu Motors Ltd 局部硬化焼結体とその製造方法
AT395550B (de) * 1991-07-02 1993-01-25 Miba Sintermetall Ag Verfahren zum herstellen eines sinterkoerpers mit wenigstens einer molybdaenhaltigen verschleissschicht
JPH0894223A (ja) * 1994-09-22 1996-04-12 Mk Seiko Co Ltd 製氷器
DE19634314A1 (de) * 1996-07-27 1998-01-29 Widia Gmbh Verbundkörper und Verfahren zu seiner Herstellung
US6322746B1 (en) * 1999-06-15 2001-11-27 Honeywell International, Inc. Co-sintering of similar materials
US7237730B2 (en) * 2005-03-17 2007-07-03 Pratt & Whitney Canada Corp. Modular fuel nozzle and method of making
US8316541B2 (en) * 2007-06-29 2012-11-27 Pratt & Whitney Canada Corp. Combustor heat shield with integrated louver and method of manufacturing the same
US7543383B2 (en) 2007-07-24 2009-06-09 Pratt & Whitney Canada Corp. Method for manufacturing of fuel nozzle floating collar
US10226818B2 (en) * 2009-03-20 2019-03-12 Pratt & Whitney Canada Corp. Process for joining powder injection molded parts
US9970318B2 (en) 2014-06-25 2018-05-15 Pratt & Whitney Canada Corp. Shroud segment and method of manufacturing

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2399773A (en) * 1943-09-02 1946-05-07 Sidney J Waintrob Method of making electrical rectifiers and the like
US2970905A (en) * 1957-09-18 1961-02-07 Haller Inc Method of making a composite sintered powdered material article
DE1483706B2 (de) * 1965-04-01 1970-04-02 Siemens AG, 1000 Berlin u. 8000 München Mehrschichten-Verbundmetall, insbesondere für hochbelastbare elektrische Kontakte und Verfahren zu seiner Herstellung
NL174715C (nl) * 1971-07-01 1984-08-01 Gen Electric Werkwijze ter vervaardiging van een slijplichaam, alsmede snijgereedschap voorzien van een volgens deze werkwijze vervaardigd inzetstuk.
DE2822902C2 (de) * 1978-05-26 1984-11-22 Miba Sintermetall Ag, Laakirchen Verfahren zum Herstellen von Ventilstößeln für Brennkraftmaschinen o.dgl.
WO1983004382A1 (en) * 1982-06-10 1983-12-22 Ford Motor Company Limited Method of making wear resistant ferrous based parts
DE3305879C2 (de) * 1983-02-19 1985-01-17 Sintermetallwerk Krebsöge GmbH, 5608 Radevormwald Verfahren zur pulvermetallurgischen Herstellung eines Verbundformteils
BR8403253A (pt) * 1983-07-01 1985-06-11 Sumitomo Electric Industries Embuchamento de assento de valvula para motores de combustao interna
DD219131A1 (de) * 1983-11-14 1985-02-27 Thale Eisen Huettenwerk Verfahren zur herstellung von maschinenbauteilen aus metallpulververbunden

Also Published As

Publication number Publication date
DE3881247D1 (de) 1993-07-01
AT388523B (de) 1989-07-25
US4839138A (en) 1989-06-13
ATA61387A (de) 1988-12-15
EP0283464A2 (de) 1988-09-21
JPH0564681B2 (enrdf_load_stackoverflow) 1993-09-16
CA1282914C (en) 1991-04-16
EP0283464A3 (en) 1989-05-10
ES2041340T3 (es) 1993-11-16
JPS63247304A (ja) 1988-10-14

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