WO1989007721A1 - Procede de production d'un element de friction metallique - Google Patents

Procede de production d'un element de friction metallique Download PDF

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Publication number
WO1989007721A1
WO1989007721A1 PCT/GB1989/000122 GB8900122W WO8907721A1 WO 1989007721 A1 WO1989007721 A1 WO 1989007721A1 GB 8900122 W GB8900122 W GB 8900122W WO 8907721 A1 WO8907721 A1 WO 8907721A1
Authority
WO
WIPO (PCT)
Prior art keywords
sintered
friction
support member
friction element
generally cylindrical
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/GB1989/000122
Other languages
English (en)
Inventor
Harold James Hillier
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 Sinter Metals Ltd
Original Assignee
GKN Sheepbridge 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 Sheepbridge Ltd filed Critical GKN Sheepbridge Ltd
Publication of WO1989007721A1 publication Critical patent/WO1989007721A1/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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/18—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass brake shoes
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/02—Composition of linings ; Methods of manufacturing
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/04—Attachment of linings
    • F16D69/0416—Attachment of linings specially adapted for curved linings
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/04—Attachment of linings
    • F16D2069/0425—Attachment methods or devices
    • F16D2069/045—Bonding
    • F16D2069/0458—Bonding metallurgic, e.g. welding, brazing, sintering
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/04—Attachment of linings
    • F16D2069/0425—Attachment methods or devices
    • F16D2069/0491—Tools, machines, processes

Definitions

  • This invention relates to a brake band of the type which may be used in an automotive transmission of a vehicle.
  • Known brake bands comprise a generally cylindrical shape of friction material secured, as by an adhesive, around the radially inner circumferential surface of a radially split, generally cylindrical steel band which is radially contractable to effect a braking action on a journal rotating within the brake band.
  • the friction material used in such known brake bands has been moulded to its generally cylindrical shape from a known resin-bonded composition, often asbestos or non-asbestos based, but such material can have unacceptably high wear rates especially when used in heavy duty applications such as, for example, in the automatic transmissions of all terrain tracked vehicles.
  • Metallic friction materials are known to provide lower wear rates than resin-bonded friction materials and have been used as planar friction elements for example in transmission clutches and in disc brakes.
  • planar metallic friction elements are known to be producible by pouring powder friction material into a die, compacting the powder in the die and then sintering the "green" compact onto a backing plate in a controlled atmosphere sintering furnace.
  • a final step may include a planishing operation to form, for example, lubricant conducting grooves in the friction surface.
  • the finished planar elements are subsequently securable to a clutch or brake member by adhesion between the backing plate and the said member or by riveting.
  • planar metallic friction elements may be produced by pouring powder friction material into a mould and sintering the material without pre-compaction; the sintered material then being removed from the mould, reheated and pressed in a further furnace to lightly compact the friction material and to secure it to a backing plate by means of an adhesive.
  • a method of forming a low density generally cylindrical metallic friction element having a circumferentially extending friction surface comprising the steps of pouring powder friction material onto a support member, sintering the powder material in a sintering furnace on said support member and removing the sintered material from the support member, the sintered material being formed to its generally cylindrical shape either before or after the sintering operation.
  • the powder friction material may be poured onto a planar support member and sintered thereon in the sintering furnace, the resulting planar sintered friction material subsequently being cut to size and formed to its cylindrical shape.
  • the powder friction material may be poured onto a support member comprising a cylindrical mould and sintered therein in the sintering furnace, the resulting cylindrical sintered friction material subsequently being removed from the mould.
  • a method of producing a complete brake band and friction element assembly comprising the method as described in any of the preceding three paragraphs and including the further step of securing the generally cylindrical friction element by adhesion to a brake band.
  • a generally cylindrical surface of the brake band may be coated with a curable adhesive, the friction element may be clamped to the coated surface and the adhesive cured under conditions of heat and pressure to secure the friction element to said surface.
  • the friction element may be machined after it has been secured to the brake band.
  • the friction material is provided initially in powder form essentially as a metallic mixture but comprising both metallic and non-metallic ingredients mixed together in predetermined proportions.
  • the metallic powders may be elemental particles or pre-alloyed particles. Generally iron or copper is the major constituent element and all of the particles are mixed together for a specific time to produce a homogeneous material.
  • the powder friction material is then poured onto a planar support member and levelled thereon to a predetermined thickness.
  • the powder friction material on its support is then passed through a sintering furnace which may conveniently comprise a continuous belt conveyor furnace having a controlled atmosphere therein whereby the powder friction material is sintered.
  • the sintered material is removed from the support member as a planar sheet which is subsequently cut to size and formed, as by rolling, to its desired generally cylindrical shape.
  • An alternative embodiment of producing the sintered material to its desired generally cylindrical shape comprises pouring the powder friction material initially into a generally cylindrical mould which is itself then passed through the controlled atmosphere sintering furnace. The resulting generally cylindrical sintered friction material is then removed from the mould.
  • the resulting sintered friction material is of low density, not having been compacted, and is of the generally cylindrical shape required for securing to a brake band.
  • the brake band proper is of known configuration comprising a steel radially split, generally cylindrical band having a radially inner circumferential surface to which is to be secured the generally cylindrical friction element.
  • the friction element is preferably secured to the radially inner surface of the brake band proper by adhesion.
  • the radially inner surface of the brake band proper may be coated with a curable adhesive, the generally cylindrical friction element clamped to the coating surface in a clamping fixture and the assembly then placed in an oven to cure the adhesive under predetermined conditions of heat and pressure to secure the friction element to the said surface of the brake band.
  • the friction element may be rolled, planished or otherwised machined to final tolerances and to incorporate lubricant conducting channels in the friction surface.
  • the invention thus provides the benefit of a sintered low density metallic friction material produced in generally cylindrical form without being subjected to pre-compaction and without being sintered onto a backing plate prior to its assembly with the brake band proper.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Braking Arrangements (AREA)

Abstract

Une bande de frein sensiblement cylindrique comprend un élément en acier fendu radialement, à la surface de circonférence radialement intérieure duquel est fixé un élément de friction sensiblement cylindrique. Ledit élément de friction a une faible densité et est produit au moyen d'un procédé consistant à verser un matériau de friction en poudre sur un élément de support, à fritter le matériau en poudre dans un four de frittage, sur l'élément de support, et à retirer le matériau fritté dudit élément de support, le matériau fritté étant formé dans sa forme sensiblement cylindrique soit avant soit après l'opération de frittage. On peut verser le matériau de friction en poudre sur un élément de support plan sur lequel on peut le fritter, dans ledit four de frittage, ledit matériau de friction fritté plan ainsi obtenu étant ensuite taillé sur mesure et en lui donnant sa forme cylindrique. Dans un autre mode de réalisation, on peut verser le matériau de friction en poudre dans un moule cylindrique dans lequel il est ensuite fritté, dans le four de frittage, le matériau de friction fritté cylindrique ainsi obtenu étant ensuite retiré dudit moule.
PCT/GB1989/000122 1988-02-11 1989-02-09 Procede de production d'un element de friction metallique Ceased WO1989007721A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8803180 1988-02-11
GB8803180A GB2214932A (en) 1988-02-11 1988-02-11 Producing cylindrical metallic friction elements by sintering powder

Publications (1)

Publication Number Publication Date
WO1989007721A1 true WO1989007721A1 (fr) 1989-08-24

Family

ID=10631535

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/000122 Ceased WO1989007721A1 (fr) 1988-02-11 1989-02-09 Procede de production d'un element de friction metallique

Country Status (2)

Country Link
GB (1) GB2214932A (fr)
WO (1) WO1989007721A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1157030A (fr) * 1956-07-27 1958-05-23 Borg Warner Perfectionnements aux rubans de freins
US2900254A (en) * 1954-10-13 1959-08-18 Sylvania Electric Prod Process of producing sintered metal sheets
US3581380A (en) * 1968-09-30 1971-06-01 Detroit Aluminum & Brass Corp Method for making transmission bands
US4406394A (en) * 1980-11-28 1983-09-27 General Motors Corporation Method of friction band manufacture

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB572801A (en) * 1942-01-24 1945-10-24 Edward Alexander Seeley Improvements in or relating to the production of shaped articles of sintered metals
GB560387A (en) * 1942-09-30 1944-04-03 Francis Arthur Catt Improvements in or relating to the production and mounting of cylindrical liners such as brake drum liners
GB619210A (en) * 1946-11-27 1949-03-04 Sk Wellman Co Improvements in a t-shaped brake shoe and method of making the same
GB688721A (en) * 1950-10-31 1953-03-11 Francis Arthur Catt Improvements in the production of cylindrical liners
GB807909A (en) * 1956-07-06 1959-01-21 Gen Motors Corp Improved porous sintered metal friction element
GB823675A (en) * 1956-07-30 1959-11-18 Bendix Aviat Corp Friction article and method of producing same
US3440312A (en) * 1965-07-30 1969-04-22 Norton Co Method of preparing plates of boron carbide powder
US3719479A (en) * 1971-02-12 1973-03-06 Du Pont Method of fabricating ring shapes by hot pressing
US3807913A (en) * 1972-05-19 1974-04-30 Motor Wheel Corp Apparatus for making a brake drum ring compact
ZA86448B (en) * 1985-02-01 1986-11-26 Pall Corp Seamless porous metal article and method of making

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2900254A (en) * 1954-10-13 1959-08-18 Sylvania Electric Prod Process of producing sintered metal sheets
FR1157030A (fr) * 1956-07-27 1958-05-23 Borg Warner Perfectionnements aux rubans de freins
US3581380A (en) * 1968-09-30 1971-06-01 Detroit Aluminum & Brass Corp Method for making transmission bands
US4406394A (en) * 1980-11-28 1983-09-27 General Motors Corporation Method of friction band manufacture

Also Published As

Publication number Publication date
GB2214932A (en) 1989-09-13
GB8803180D0 (en) 1988-03-09

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