[go: up one dir, main page]

WO1993014925A1 - Fabrication de paliers lisses - Google Patents

Fabrication de paliers lisses Download PDF

Info

Publication number
WO1993014925A1
WO1993014925A1 PCT/GB1993/000152 GB9300152W WO9314925A1 WO 1993014925 A1 WO1993014925 A1 WO 1993014925A1 GB 9300152 W GB9300152 W GB 9300152W WO 9314925 A1 WO9314925 A1 WO 9314925A1
Authority
WO
WIPO (PCT)
Prior art keywords
polytetrafluoroethylene
particles
fibrillation
layer
pressure
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/GB1993/000152
Other languages
English (en)
Inventor
Glyndwr John Davies
Philip Moisey
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.)
Federal Mogul Shoreham Ltd
Original Assignee
Glacier Vandervell 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 Glacier Vandervell Ltd filed Critical Glacier Vandervell Ltd
Publication of WO1993014925A1 publication Critical patent/WO1993014925A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/006—Pressing and sintering powders, granules or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/201—Composition of the plastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0088—Blends of polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/251—Particles, powder or granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/04—Bearings
    • B29L2031/045—Bushes therefor

Definitions

  • This invention is concerned with a method for manufacturing a plain bearing.
  • bearings comprise a layer of sintered metallic material, e.g. bronze, formed on a backing material such as steel.
  • the layer of sintered metallic material has an overlay of polytetrafluoroethylene which is forced into the intersticies of at least a surface portion of the layer of sintered metallic material and forms a low friction surface of the bearing.
  • Such bearings may be formed by applying particles of polytetrafluoroethylene to the surface of the layer of sintered metallic material and applying heat and pressure to the particles so that the polytetrafluoroethylene is forced into the intersticies as described above.
  • a dispersion of polytetrafluorethylene is coagulated in the presence of a filler, e.g. lead powder, and a high proportion of toluene.
  • a filler e.g. lead powder
  • toluene a filler
  • This mush is applied to the surface of the sintered metallic layer, the toluene acting as a lubricant to assist the flow of the polytetrafluoroethylene/lead into the intersticies of the sintered material.
  • the mush is extremely shear-sensitive, in that there is a tendency for the particles of polytetrafluoroethylene to fibrillate when they are subjected to relative movement.
  • Even mild working of the mush causes thin fibrilles of polytetrafluoroethylene to be drawn out across the shearing surfaces resulting in the mush quickly becoming very stiff and unusable since it does not possess the good flow characteristics required to enable it to impregnate the intersticies of the sinter.
  • the mush is applied very carefully by hand to the sintered layer and attempts to avoid the necessity for such a hand operation by introducing automatic handling of the mush have so far, so far as is known, been unsuccessful.
  • the invention provides a method of manufacturing a plain bearing comprising applying particles of polytetrafluoroethylene to the surface of a layer of sintered metallic material and applying heat and pressure to the particles so that the polytetrafluoroethylene is forced into the intersticies of at least a surface portion of the layer of sintered metallic material and forms a low friction surface thereon, characterised in that the particles of polytetrafluoroethylene applied are encapsulated in a coating of a material which prevents fibrillation of the polytetrafluoroethylene during application of the particles but which breaks down during said application of heat and pressure to allow such fibrillation.
  • the polytetrafluoroethylene particles are prevented from fibrillating until after they have been applied to the sintered metallic material so that handling of the particles by automatic application means does not cause such fibrillation. Furthermore, as the particles are protected from fibrillation, the particles can be applied as a dry powder which is not possible in the conventional process since the mush of the conventional process when dried is unworkable.
  • toluene as a lubricant to be dispensed with since toluene has been selected as a material which can form a stable emulsion with the polytetrafluoroethylene and as having coagulation characteristics which allow it to coagulate with the polytetraflurorethylene mush leaving toluene within the mush.
  • the lubricant can be added after the dry powder has been applied, for example, in the form of kerosine.
  • the polytetrafluoroethylene can be stored in powder form and used when required with the addition of liquid lubricant.
  • the coating is formed from an acrylic co- polymer, for example an acidic cross-linked acrylic emulsion co-polymer.
  • the polytetrafluoroethylene particles may also contain a filler, for example, lead, molybdenum disulphide, graphite, bronze, or zinc.
  • a filler for example, lead, molybdenum disulphide, graphite, bronze, or zinc.
  • the polytetrafluoroethylene particles may contain an anti-discolouring agent particularly where a filler of lead is used.
  • the anti-discolouring agent may be designed to prevent the formation of lead oxide.
  • a dispersion of 75% polytetrafluoroethylene solids in water was poured in to a Hobart mixer fitted with a K-paddle. The mixer was operated at its slowest speed. To this dispersion in the mixer, a 28% solid aqueous solution of acidic cross-linked acrylic emulsion co-polymer was added. Mixing continued for 4 minutes. Then, sufficient lead powder to produce a 20% by volume lead metal content in the final lead and polytetrafluoroethylene mixture was dispersed in a minimum quantity of water with the minimum quantity of a non-ionic surfactant to give a free flowing liquid. The liquid was added to the mixture in the mixer as rapidly as possible to prevent the heavy lead from separating out.
  • a discolouring agent was added to the mixture to prevent the lead metal from forming oxides during drying.
  • the discolouring agent in question was sodium nitrite stirred into an ammonia solution.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sliding-Contact Bearings (AREA)
  • Lubricants (AREA)

Abstract

Procédé de fabrication de paliers lisses dans lequel on applique des particules de polytétrafluoroéthylène sur un matériau métallique fritté, puis on applique de la chaleur et de la pression pour pousser le polytétrafluoroéthylène dans les interstices situées à la surface du matériau. Les particules sont encapsulées dans un revêtement du matériau qui empêche la fibrillation du polytétrafluoroéthylène pendant l'application desdites particules. Le matériau de revêtement est sélectionné de manière à ce qu'il se décompose lorsqu'on applique la chaleur et la pression permettant la fibrillation.
PCT/GB1993/000152 1992-02-04 1993-01-25 Fabrication de paliers lisses Ceased WO1993014925A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9202304.3 1992-02-04
GB9202304A GB2264150B (en) 1992-02-04 1992-02-04 Manufacture of plain bearings

Publications (1)

Publication Number Publication Date
WO1993014925A1 true WO1993014925A1 (fr) 1993-08-05

Family

ID=10709771

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/000152 Ceased WO1993014925A1 (fr) 1992-02-04 1993-01-25 Fabrication de paliers lisses

Country Status (2)

Country Link
GB (1) GB2264150B (fr)
WO (1) WO1993014925A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996021522A1 (fr) * 1995-01-12 1996-07-18 Sintermetallwerk Krebsöge Gmbh Composant fabrique selon la technique de la metallurgie des poudres
US6180574B1 (en) 1998-12-16 2001-01-30 Rexnord Corporation Self-lubricating bearing and coating
US6471149B1 (en) 1996-06-29 2002-10-29 Buhler Ag Gap mill

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3996143A (en) * 1972-04-04 1976-12-07 Kamatics Corporation Cured acrylate bearing member
PL131464B1 (en) * 1981-09-23 1984-11-30 Wojskowy Inst Tech Pancerne Method of obtaining antifriction material

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63111312A (ja) * 1986-10-29 1988-05-16 N D C Kk 複層軸受ならびのその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3996143A (en) * 1972-04-04 1976-12-07 Kamatics Corporation Cured acrylate bearing member
PL131464B1 (en) * 1981-09-23 1984-11-30 Wojskowy Inst Tech Pancerne Method of obtaining antifriction material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
STN International, File CA, Chemical Abstracts, volume 109, no. 16, 17 October 1988, (Columbus, Ohio, US), Janecki Janusz et al: "Manufacture of antifriction material for slide bearings", abstract 130220b, & PL 131464 B1 20 Mar 1987 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996021522A1 (fr) * 1995-01-12 1996-07-18 Sintermetallwerk Krebsöge Gmbh Composant fabrique selon la technique de la metallurgie des poudres
US6471149B1 (en) 1996-06-29 2002-10-29 Buhler Ag Gap mill
US6180574B1 (en) 1998-12-16 2001-01-30 Rexnord Corporation Self-lubricating bearing and coating

Also Published As

Publication number Publication date
GB2264150B (en) 1995-05-17
GB2264150A (en) 1993-08-18
GB9202304D0 (en) 1992-03-18

Similar Documents

Publication Publication Date Title
US6461679B1 (en) Bearing material
JP3600240B2 (ja) 滑り軸受
US2813041A (en) Method of impregnating porous metal strip with polytetrafluoroethylene
CA1293352C (fr) Procede pour la realisation d'articles plats en materiaux particulaires
JP4065558B2 (ja) 合成樹脂滑り層を持つ軸受のための複合材料の製造方法並びにこれに適するペースト
JP2002506176A (ja) 平軸受
CN1044914C (zh) 普通轴承材料
JPH0150765B2 (fr)
EP0932772B2 (fr) Formation d'un palier
PL147533B1 (en) Bearing material
US3432511A (en) Processing of plastic materials
US3247116A (en) Lubricants containing degraded polytetrafluoroethylene
WO1993014925A1 (fr) Fabrication de paliers lisses
JPH03115494A (ja) 滑り目的のための複合材料及びその製造方法
US20010038726A1 (en) Plain bearing structure
EP0546070B1 (fr) Matiere a base de plastique pour coussinets, et coussinet presentant un revetement de cette matiere
KR100229408B1 (ko) 금속흑연질 브러시 및 그의 제조방법
KR910003899B1 (ko) Fe계 소결합금 마찰재
JP2649673B2 (ja) 燃料電池用マトリツクスの製造方法
DE2121477A1 (en) Bearing material - contg graphite powder, phenol-aniline -formaldehyde resin, opt non-ferrous metal and abrasive
RU2000125566A (ru) Подшипник скольжения

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP RU US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
122 Ep: pct application non-entry in european phase