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WO1990014185A1 - Tige de connexion - Google Patents

Tige de connexion Download PDF

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Publication number
WO1990014185A1
WO1990014185A1 PCT/GB1990/000797 GB9000797W WO9014185A1 WO 1990014185 A1 WO1990014185 A1 WO 1990014185A1 GB 9000797 W GB9000797 W GB 9000797W WO 9014185 A1 WO9014185 A1 WO 9014185A1
Authority
WO
WIPO (PCT)
Prior art keywords
powder
connecting rod
cavity
big end
sintered
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.)
Ceased
Application number
PCT/GB1990/000797
Other languages
English (en)
Inventor
Roger Lionel Lawcock
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.)
GKN Technology Ltd
Original Assignee
GKN Technology 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 GKN Technology Ltd filed Critical GKN Technology Ltd
Publication of WO1990014185A1 publication Critical patent/WO1990014185A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/02—Constructions of connecting-rods with constant length
    • F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like

Definitions

  • This invention is concerned with a connecting rod and a process for making such a connecting rod.
  • the process of making components from sintered metal powder is well-known and is used for parts which would require considerable machining if made by conventional means.
  • the process involves introducing metal powder into a die having the shape of the required part, applying pressure to consolidate the powder and cause it to flow into all parts of the die, removing the consolidated powder from the die (the pressure has caused it to adhere together sufficiently to allow this), and introducing the consolidated powder into a furnace in which the powder is caused to sinter together as a result of the heat applied thereto.
  • Various powders can be used depending on the properties required of the component which can if necessary be machined to give it its final shape, e.g. by cutting threaded holes.
  • the part may also be pressed again and heat treated prior to machining.
  • One component which has been considered as a candidate for manufacture by the above-mentioned process is the well-known connecting rod used in the automotive industry which has a big end and a small end.
  • the connecting rod used in the automotive industry which has a big end and a small end.
  • the sintered connecting rod weighed no more than one made by conventional means, caused the connecting rod to be out of balance in that the weight of the small end was out of proportion. This rendered the connecting rod unacceptable.
  • This problem could be solved by using a powder giving higher strength which would allow the small end to be designed in the correct proportion but the use of such powder increases the cost unacceptably.
  • Another problem with the use of higher strength material is that it is more difficult to machine, e.g. for cutting bolt holes in the big end.
  • the invention provides a process of making a connecting rod which defines a small end and at least part of a big end comprising introducing metal powder into a die cavity having the shape of the required connecting rod, applying pressure to the powder in the die cavity thereby consolidating the powder in the shape of the cavity, removing the consolidated powder from the cavity, and heating the consolidated powder in a furnace thereby causing the powder to become sintered, characterised in that a first powder is introduced into the portion of the cavity having the shape of the small end and a second powder is introduced into the portion of the cavity having the shape of at least part of the big end, the first powder having greater strength than the second powder.
  • a connecting rod is produced which has additional strength in the material at the small end so that the rod can be designed to have the correct balance point but the more expensive stronger material is used at the small end only reducing the additional expense. Furthermore, more readily machinable material is located at the big end where machining of bolt holes may be required.
  • the first and the second powders are introduced into the cavity simultaneously, e.g. from a shoe which is divided into two portions each with its own powder supply. Simultaneous introduction of powders militates against a powder spreading beyond its intended portion of the cavity.
  • the first powder may suitably be an at least partially pre-alloyed powder containing Nickel, Molybdenum, Copper or Carbon or a combination of these elements.
  • the process may also comprise making a cap to complete the big end.
  • the cap is suitably made from the second powder.
  • the invention also provides a connecting rod which is formed from powder which has been sintered, characterised in that the connecting rod comprises a small end portion sintered from a first powder, and a big end portion sintered from a second powder, the first powder having greater strength than the second powder.
  • the first powder contains Nickel or Molybdenum in greater proportion than the second powder.
  • Figure 1 is a plan view of a first connecting rod
  • Figure 2 is a plan view of a second connecting rod
  • Figure 3 is a diagrammatic view of apparatus for carrying out a process for making the connecting rods of Figures 1 or 2.
  • the first connecting rod 10 shown in Figure 1 comprises a small end portion 12 including a hole 13 to receive a shaft and a shank portion 15 having an elongated central hole 17 therein.
  • the small end portion 12 is adapted to be pushed on to a shaft (not shown).
  • the connecting rod 10 also comprises a big end portion 14 having a hole 19 surrounded by a metal band 21 which is adapted to be cut or split and provided with threaded bolt holes so that it can be clamped around a shaft received in the hole 19.
  • the small end portion 12 is sintered from a first powder which is a partially pre-alloyed powder containing Iron and proportions of Nickel, Molybdenum, Copper and Carbon as required for the desired strength.
  • the big end portion 14 is sintered from a second powder which is similar to the first powder but contains lower proportions of Nickel, Molybdenum, Copper and Carbon giving lower strength, easier machining and lower cost.
  • the line 16 in Figure 1 indicates the approximate location of the boundary between the first and the second powders although in this region there is some intermingling of the powders.
  • the composition of the first and second powders may be selected from a wide range of possibilities. Not only partially pre-alloyed and fully pre-alloyed powders may be used but also elemental mixtures in appropriate circumstances. The proportions of Nickel, Molybdenum, Copper and Carbon may also vary and indeed, in appropriate circumstances, one or more of these elements may be absent or may be replaced by other constituents.
  • the first powder should, however, be selected so as to give, after compacting, sintering, possible repressing and heat treatment, a density of at least 6.9 gms per cu.cm.
  • the second powder should give, after the same treatment, a density of at least 6.8 gms per cu.cm. and a tensile strength of at least 400 Newtons per sq.cm.
  • the second connecting rod 10a shown in Figure 2 has a small end portion 12a which is similar to the small end portion 12 of the rod 10 but its big end portion 14a differs in that only a part of the big end is defined. Instead of a hole 19, the portion 14a has a recess 19a which is adapted to be closed by a cap (not shown) when a shaft is received in the slot 19a.
  • the rod 10a is sintered from the first powder (the portion 12a up to the line 16a) and the second powder (the portion 14a).
  • the cap may be sintered from the second powder or may be made by other methods.
  • FIG. 3 shows diagrammatically apparatus used in the process of making the first connecting rod 10 or the second connecting rod 10a.
  • the apparatus comprises a lower punch 20 which incorporates ejecting means (not shown), a die 22 having a die cavity 24 having the shape of the connecting rod 10 or 10a, a vertically movable upper punch 26 which can be raised into the position shown in which it is clear of the die 22 and lowered into a position on top of the die 22 so that it applies pressure to powder in the cavity 24.
  • the apparatus also comprises a shoe 28 which is movable horizontally between the position shown in which it is on top of the die 22 and beneath the upper punch 26 and an out-of-the-way position (not shown) clear of the die 22 and the upper punch 26.
  • the shoe 28 is effectively a box closed at the top and open at the bottom and divided into two chambers 32 and 34 by vertical walls 33.
  • Two flexible pipes 35 and 36 lead into the chambers 32 and 34 and are connected to sources of powder (not shown) operaole to dispense powder into the cavity 24 via the chambers 32 and 34.
  • the shoe 28 In the process, while the upper platen 26 is in its raised position, the shoe 28 is moved from its out-of-the-way position to the position over the die 22 (shown in Figure 2). This movement (which is in a direction towards the viewer of Figure 3) causes the shoe 28 to push a previously ejected connecting rod, which was on top of the die 22 after ejection from the cavity 24 by the ejection means, to be pushed clear of the cavity 24.
  • the connecting rod can then be carried to a furnace for sintering.
  • the first powder is supplied via the pipe 36 to the chamber 32 and the second powder is simultaneously supplied via the pipe 35 to the chamber 33.
  • the metal powder is introduced into the cavity 24 by falling through the open bottoms of the chambers 32 and 34.
  • a central vertical wall 34 is located above the line 16 or 16a.
  • the shoe 28 is moved to its out-of-the-way position and the punch 26 is lowered to apply pressure to the powder to cause it to consolidate in the shape of the cavity 24.
  • the punch 26 is then raised and the consolidated powder is ejected from the cavity 24 by operation of the ejection means.
  • the consolidated powder is pushed away from the cavity 24 in the next operation of the apparatus and transported to the furnace where it is heated and thereby the powder is caused to become sintered.
  • the connecting rod may be re-pressed and heat treated.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Powder Metallurgy (AREA)

Abstract

Une tige de connexion est fabriquée en introduisant de la poudre de métal dans une empreinte (24) en exerçant une pression sur la poudre pour la comprimer, en retirant cette poudre comprimée de la cavité, et en la chauffant dans un four pour qu'elle fritte. La petite partie terminale (12, 12a) de la tige est faite avec une poudre de plus grande résistance alors que la grosse partie terminale (14, 14a) est faite avec une poudre de moindre résistance mais plus économique.
PCT/GB1990/000797 1989-05-25 1990-05-22 Tige de connexion Ceased WO1990014185A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8912008A GB2233000A (en) 1989-05-25 1989-05-25 Connecting rod
GB8912008.3 1989-05-25

Publications (1)

Publication Number Publication Date
WO1990014185A1 true WO1990014185A1 (fr) 1990-11-29

Family

ID=10657314

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/000797 Ceased WO1990014185A1 (fr) 1989-05-25 1990-05-22 Tige de connexion

Country Status (2)

Country Link
GB (1) GB2233000A (fr)
WO (1) WO1990014185A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2676101A1 (fr) * 1991-05-03 1992-11-06 Daimler Benz Ag Bielle pour moteurs a pistons.
AT409657B (de) * 2000-09-26 2002-10-25 Miba Sintermetall Ag Gesinterte pleuelstange für eine verbrennungskraftmaschine
EP1777422A1 (fr) * 2005-10-20 2007-04-25 Neander Motors AG Bielle pour une machine à piston

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4307560C2 (de) * 1993-03-10 2001-10-25 Bayerische Motoren Werke Ag Verfahren zur pulvermetallurgischen Herstellung eines bereichsweise unterschiedlichen Belastungsarten ausgesetzten Maschinenteils
US7175404B2 (en) * 2001-04-27 2007-02-13 Kabushiki Kaisha Toyota Chuo Kenkyusho Composite powder filling method and composite powder filling device, and composite powder molding method and composite powder molding device
US7299715B2 (en) * 2004-05-27 2007-11-27 International Engine Intellectual Property Company, Llc Non-homogeneous engine component formed by powder metallurgy
US20070261514A1 (en) * 2006-04-13 2007-11-15 Geiman Timothy E Multi-material connecting rod

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3580106A (en) * 1969-09-23 1971-05-25 Singer Co Aluminum pressed metal link for 600 class sewing machines
EP0072175A1 (fr) * 1981-08-07 1983-02-16 Rolf Jan Mowill Procédé de fabrication d'une préforme monolithique composite à partir d'alliages
US4721598A (en) * 1987-02-06 1988-01-26 The Timken Company Powder metal composite and method of its manufacture
JPS63128102A (ja) * 1986-11-18 1988-05-31 Mitsubishi Motors Corp 軸受部付きコネクチングロツドの製造方法
US4777844A (en) * 1986-12-23 1988-10-18 Ford Motor Company Hybrid ceramic/metal compression link for use in higher temperature applications

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58152982A (ja) * 1982-03-09 1983-09-10 Honda Motor Co Ltd 高剛性を有する二層焼結合金製バルブシ−トリング
JPS58215299A (ja) * 1982-06-09 1983-12-14 Nippon Piston Ring Co Ltd 複合バルブシ−トの製造方法
DE3541781C2 (de) * 1984-11-28 1999-09-02 Honda Motor Co Ltd Verfahren zur Herstellung eines Bauteils aus einer hitzebeständigen, hochfesten, gesinterten Aluminiumlegierung sowie eine hitzebeständige, hochfeste Aluminiumlegierung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3580106A (en) * 1969-09-23 1971-05-25 Singer Co Aluminum pressed metal link for 600 class sewing machines
EP0072175A1 (fr) * 1981-08-07 1983-02-16 Rolf Jan Mowill Procédé de fabrication d'une préforme monolithique composite à partir d'alliages
JPS63128102A (ja) * 1986-11-18 1988-05-31 Mitsubishi Motors Corp 軸受部付きコネクチングロツドの製造方法
US4777844A (en) * 1986-12-23 1988-10-18 Ford Motor Company Hybrid ceramic/metal compression link for use in higher temperature applications
US4721598A (en) * 1987-02-06 1988-01-26 The Timken Company Powder metal composite and method of its manufacture

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Volume 12, No. 376 (M-750) (3223), 7 October 1988 & JP, A, 63128102 (Mitsubishi Motors Corp.) 31 May 1988 see the Abstract *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2676101A1 (fr) * 1991-05-03 1992-11-06 Daimler Benz Ag Bielle pour moteurs a pistons.
GB2255613A (en) * 1991-05-03 1992-11-11 Daimler Benz Ag A connecting rod for piston engines
GB2255613B (en) * 1991-05-03 1994-10-26 Daimler Benz Ag A connecting rod for piston engines
AT409657B (de) * 2000-09-26 2002-10-25 Miba Sintermetall Ag Gesinterte pleuelstange für eine verbrennungskraftmaschine
US7096756B2 (en) 2000-09-26 2006-08-29 Miba Sintermetall Aktiengesellschaft Sintered connecting rod for an internal combustion engine
EP1777422A1 (fr) * 2005-10-20 2007-04-25 Neander Motors AG Bielle pour une machine à piston
US7739928B2 (en) 2005-10-20 2010-06-22 Neander Motors Ag Connecting rod for piston engine

Also Published As

Publication number Publication date
GB2233000A (en) 1991-01-02
GB8912008D0 (en) 1989-07-12

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