EP0416418A2 - Verfahren zum Herstellen von Kipphebeln - Google Patents

Verfahren zum Herstellen von Kipphebeln Download PDF

Info

Publication number
EP0416418A2
EP0416418A2 EP90116371A EP90116371A EP0416418A2 EP 0416418 A2 EP0416418 A2 EP 0416418A2 EP 90116371 A EP90116371 A EP 90116371A EP 90116371 A EP90116371 A EP 90116371A EP 0416418 A2 EP0416418 A2 EP 0416418A2
Authority
EP
European Patent Office
Prior art keywords
weight
amount
rocker arm
cast iron
added
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
EP90116371A
Other languages
English (en)
French (fr)
Other versions
EP0416418A3 (en
EP0416418B1 (de
Inventor
Makoto C/O Nissan Motor Company Limited Kano
Ichiro C/O Nissan Motor Company Limited Tanimoto
Osamu C/O Nippon Piston Ring Co. Ltd. Kawamura
Teruo C/O Nippon Piston Ring Co. Ltd. Takahashi
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.)
Nissan Motor Co Ltd
Nippon Piston Ring Co Ltd
Original Assignee
Nissan Motor Co Ltd
Nippon Piston Ring Co Ltd
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 Nissan Motor Co Ltd, Nippon Piston Ring Co Ltd filed Critical Nissan Motor Co Ltd
Publication of EP0416418A2 publication Critical patent/EP0416418A2/de
Publication of EP0416418A3 publication Critical patent/EP0416418A3/en
Application granted granted Critical
Publication of EP0416418B1 publication Critical patent/EP0416418B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • C22C33/08—Making cast-iron alloys

Definitions

  • the present invention relates to a method of making a rocker arm utilizable as an element of a valve mechanism in an automotive internal combustion engine.
  • Anti-wear rocker arms as described in JP A Sho 63-303030, are producible as one piece from high chrome cast iron by casting.
  • the anti-wear property is resulted from high-hardness carbides such as (Fe, Cr)7C3 in the matrix.
  • High-hardness Fe-Cr-composite carbides tend to form a directional solidification in which acicular precipitates direct to the casting surface.
  • the acicular carbides abrase the sliding surface of the associated cam member.
  • acicular carbides can be rounded or globulized when tungsten is added in an amount of more than 10% by weight to the high chrome cast iron.
  • it can not be a solution of the problem, because the addition of more than 10% of tungsten is costly, what is worse, produces tungsten carbides that are highly hard and abrasive to the cam member.
  • the invention as claimed is intended to solve the problem as described above and has an object to provide a method of manufacturing a rocker arm that is less abrasive to the cam member associated.
  • the invention is achieved as a result of extensive research made from a finding that an addition agent for treating molten high chrome cast iron is effective to globulize Fe-Cr-composite carbides.
  • a Ca-Si base addition agent is added in an amount of 0.3 to 0.6% by weight to a molten metal in a process of casting a rocker arm as one piece from high chrome cast iron.
  • the Ca-Si base addition agent contains about 30% of Ca, about 60% of Si, and about 10% of impurities.
  • One or more of Ba, Sr, Mg, Zr, Ce, Mn, and Al may be added in an amount of 05 to 5% by weight to the agent.
  • the high chrome cast iron contains more than 10% of Cr and preferably has the composition consisting, by weight, of C: 2.5-3.7%, Si: 1.0-2.0%, Mn: 0.5-1.0%, Cr: 15-20%, Ni: 0.3-0.7%, P: no more than 0.3%, S: no more than 1.0%, and Fe and unavoidable impurities: the balance.
  • the cast iron may additionally contain one or more of W, Mo, V, Nb, Ta, Ti, and B in an amount of 3 to 10%, by weight, if necessary.
  • the Ca-Si base addition agent When the Ca-Si base addition agent is added to the molten metal not as a deoxidizer but as a globulizer, it should be added in an amount of no less than 0.3% by weight.
  • the amount of less than 0.3% of the agent is insufficient to round carbide precipitates or achieve the object of the present invention.
  • the amount of more than 0.6% increase cost without more improvement of the roundness. Therefore, the addition agent should be added to the molten metal in an amount of 0.3 to 0.6% by weight.
  • the Ca-Si base addition agent is moderate in reaction, operable with ease, and contributable to a high yield.
  • the inventive method of casting a rocker arm as one piece from high chrome cast iron is characterized in that a Ca-Si base addition agent is added to the molten metal in an amount of 0.3 to 0.6% by weight.
  • the Ca-Si base addition agent is effective not only to deoxidize the molten metal but also to globulize precipitates of Fe-Cr carbide.
  • the method of the invention can produce a rocker arm of the type having globular precipitates of Fe-Cr carbide. This results to advantages that the rocker arm is the same in abrasion resistance as the conventional but less aggressive against the other member and that the cam member is less worn when coupled with the inventive rocker arm than when coupled with the conventional one.
  • the molten metal of each sample was treated with the individual agent of which the content, amount and elements added are given in Table 1. Every sample was hardened and tempered in the same way after casting. The samples were classified to 11 Examples and 2 Comparisons on the basis of the composition of the addition agent. Examples and Comparisons except Examples 3, 7, 9, 11 were etched and photomicrographed as illustrated in FIGS. 1 to 9. The photomicrographs show white carbide grains distributed in the black pearlitic matrix. Each photomicrograph was analyzed by an image analyzer by which both the real and circumcircular areas of each carbide grain were measured for calculation of the ratio of the former to the latter. The average value of the ratios indicates the roundness or globularity of each of Examples and Comparisons. The values of globularity are also given in Table 1.
  • FIGS. 1 to 7 Examples have carbides in the shape of globular grains.
  • FIGS. 8 and 9 show that Comparisons have carbides in the shape of sharp or acicular grains. This difference in shape of carbides is also understood from the values of globularity in Table 1. Examples have the globularities of more than 42% while Comparisons have the globularities of 28% and 32%. It is known that, when the rocker arm has the globularity of more than 40%, it is unaggressive against the associated cam member with the result that the cam member is improved in weariness.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
EP19900116371 1989-09-08 1990-08-27 Verfahren zum Herstellen von Kipphebeln Expired - Lifetime EP0416418B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1231732A JP2914634B2 (ja) 1989-09-08 1989-09-08 ロッカーアームの製造方法
JP231732/89 1989-09-08

Publications (3)

Publication Number Publication Date
EP0416418A2 true EP0416418A2 (de) 1991-03-13
EP0416418A3 EP0416418A3 (en) 1992-06-10
EP0416418B1 EP0416418B1 (de) 1996-11-06

Family

ID=16928167

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900116371 Expired - Lifetime EP0416418B1 (de) 1989-09-08 1990-08-27 Verfahren zum Herstellen von Kipphebeln

Country Status (3)

Country Link
EP (1) EP0416418B1 (de)
JP (1) JP2914634B2 (de)
DE (1) DE69029074T2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104087813A (zh) * 2014-06-19 2014-10-08 宁国市正兴耐磨材料有限公司 一种矿山特种专用研磨球
CN108220760A (zh) * 2017-12-29 2018-06-29 中钢集团邢台机械轧辊有限公司 一种含Nb的高铬铁轧辊
CN109723513A (zh) * 2017-10-30 2019-05-07 丹阳市金长汽车部件有限公司 一种发动机气门摇臂
CN112695242A (zh) * 2020-11-30 2021-04-23 中钢集团邢台机械轧辊有限公司 一种开坯辊及其制备方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2045414C3 (de) * 1970-09-15 1975-06-05 Koerver & Nehring Gmbh, 4150 Krefeld Verwendung eines austenitischen Gußeisens mit Lamellengraphi für Gleitlager etc
JPS531122A (en) * 1976-06-24 1978-01-07 Kawasaki Heavy Ind Ltd Wear resistant hard cast iron
DE2738379A1 (de) * 1977-05-24 1978-11-30 Metal Research Corp Verfahren zum raffinieren von eisen- und stahlschmelzen
DD254217A1 (de) * 1982-08-02 1988-02-17 Juergen Jahn Verfahren zur herstellung von hochverschleissfesten, schlagbeanspruchbaren gussteilen
GB2205108A (en) * 1987-05-30 1988-11-30 Nippon Piston Ring Co Ltd A rocker arm

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5129493B2 (de) * 1971-12-24 1976-08-26
JP2657402B2 (ja) * 1987-09-08 1997-09-24 本田技研工業株式会社 摺動部材を組合わせた摺動構造

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2045414C3 (de) * 1970-09-15 1975-06-05 Koerver & Nehring Gmbh, 4150 Krefeld Verwendung eines austenitischen Gußeisens mit Lamellengraphi für Gleitlager etc
JPS531122A (en) * 1976-06-24 1978-01-07 Kawasaki Heavy Ind Ltd Wear resistant hard cast iron
DE2738379A1 (de) * 1977-05-24 1978-11-30 Metal Research Corp Verfahren zum raffinieren von eisen- und stahlschmelzen
DD254217A1 (de) * 1982-08-02 1988-02-17 Juergen Jahn Verfahren zur herstellung von hochverschleissfesten, schlagbeanspruchbaren gussteilen
GB2205108A (en) * 1987-05-30 1988-11-30 Nippon Piston Ring Co Ltd A rocker arm

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2, no. 46 (C-77)(5122) 28 March 1978 & JP-A-53 001 122 ( KAWASAKI ) 7 January 1978 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104087813A (zh) * 2014-06-19 2014-10-08 宁国市正兴耐磨材料有限公司 一种矿山特种专用研磨球
CN109723513A (zh) * 2017-10-30 2019-05-07 丹阳市金长汽车部件有限公司 一种发动机气门摇臂
CN108220760A (zh) * 2017-12-29 2018-06-29 中钢集团邢台机械轧辊有限公司 一种含Nb的高铬铁轧辊
CN112695242A (zh) * 2020-11-30 2021-04-23 中钢集团邢台机械轧辊有限公司 一种开坯辊及其制备方法

Also Published As

Publication number Publication date
DE69029074D1 (de) 1996-12-12
JP2914634B2 (ja) 1999-07-05
JPH0397828A (ja) 1991-04-23
EP0416418A3 (en) 1992-06-10
EP0416418B1 (de) 1996-11-06
DE69029074T2 (de) 1997-04-03

Similar Documents

Publication Publication Date Title
EP0371760B1 (de) Hochfestes Gusseisen mit hohem Chromgehalt und daraus hergestellte Ventilkipphebel
US5195473A (en) Rocker arm and method of casting
US4153017A (en) Alloyed chilled iron
EP0416418A2 (de) Verfahren zum Herstellen von Kipphebeln
US5013611A (en) Camshaft composition
CN110066958B (zh) 一种铜铬合金蠕墨铸铁生产工艺
JPH07252583A (ja) クランクシャフト用球状黒鉛鋳鉄
US5064608A (en) Camshaft and method for producing the same
JPH05230596A (ja) ピストンリング材
JP2981899B2 (ja) ピストンリング材
JP2594505B2 (ja) ロッカアーム
JPH03134208A (ja) 高クロム鋳鉄製ロッカーアーム
JP2733773B2 (ja) ロッカアーム
JP2726591B2 (ja) 高耐食性高強度高靱性二相ステンレス鋼
EP0877097A1 (de) Einsatzgehärteter Stahl
JPH07316754A (ja) 鋳包みカムシャフト用カムロブに使用する合金及びそれを使用したカムロブ
JP2683444B2 (ja) 内燃機関の動弁機構用焼結合金
SU1725757A3 (ru) Износостойкий чугун
JPH05163551A (ja) 粉末高速度工具鋼
SU981429A1 (ru) Чугун
JPS60255958A (ja) 耐摩耗性焼結合金
SU1544835A1 (ru) Износостойкий сплав
SU998563A1 (ru) Чугун
SU1661238A1 (ru) Чугун
JPS61157656A (ja) 耐摩耗性白鋳鉄

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE GB

17P Request for examination filed

Effective date: 19920720

17Q First examination report despatched

Effective date: 19931026

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB

REF Corresponds to:

Ref document number: 69029074

Country of ref document: DE

Date of ref document: 19961212

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20060823

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20060824

Year of fee payment: 17

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20070827

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070827