WO1997009469A1 - Fabrication de dresseurs au diamant - Google Patents

Fabrication de dresseurs au diamant Download PDF

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Publication number
WO1997009469A1
WO1997009469A1 PCT/GB1996/002132 GB9602132W WO9709469A1 WO 1997009469 A1 WO1997009469 A1 WO 1997009469A1 GB 9602132 W GB9602132 W GB 9602132W WO 9709469 A1 WO9709469 A1 WO 9709469A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrolyte
current
mould
procesε
nickel
Prior art date
Application number
PCT/GB1996/002132
Other languages
English (en)
Inventor
Peter David Morris
Stephen Leslie Noakes
Original Assignee
Consort Precision Diamond Company Limited
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 Consort Precision Diamond Company Limited filed Critical Consort Precision Diamond Company Limited
Priority to AU68335/96A priority Critical patent/AU6833596A/en
Priority to EP96928616A priority patent/EP0847455B1/fr
Priority to DE69602373T priority patent/DE69602373T2/de
Publication of WO1997009469A1 publication Critical patent/WO1997009469A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/0018—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for by electrolytic deposition
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires

Definitions

  • Thi ⁇ invention concerns the production of diamond dressers.
  • Diamond dressers sometimes known as diamond profile rolls, are mainly used in the aero engine and motor engine manufacturing industries.
  • a diamond dresser is generally circular in shape with its .periphery coated with diamonds to a predetermined configuration of high tolerance.
  • a diamond dresser is mounted on a grinding machine and rotated by means of an independent drive unit to dress the configuration of the dresser onto a rotating abrasive (grinding) wheel. The grinding wheel is then ready for use in forming and finishing component ⁇ especially of aero- and motor engines.
  • Diamond dressers are generally made by first forming a graphite mould to high accuracy, the internal profile of the mould matching the desired external profile of the finished diamond dresser. Diamonds are then adhered onto the internal surface of the mould and the mould is placed in a bath of electrolyte. The mould forms the cathode and a basket of nickel pellets form the anode, so that nickel is deposited on the diamond layer by an electro-plating process. The electro ⁇ plating process is continued until a layer of nickel of sufficient depth has been deposited on the diamonds. A solid steel shaft is then fitted in the centre of the mould using a low melting alloy. When the mould has cooled, the end faces of the mould are machined in a lathe and the graphite mould broken away to leave the diamond dresser.
  • each electro-plating process reguires a large area of operation as each mould has to be in its own electrolyte bath and each bath reguires a heating jacket to bring the electrolyte up to a suitable operating temperature.
  • An object of this invention is to provide an improved process and apparatus for producing diamond dressers.
  • a process for producing diamond dressers including the steps of forming a mould for the dresser having a desired internal profile, adhering diamonds to said profile, and electro-plating a metal, typically nickel, onto the diamonds, characterised in that the electro-plating process is carried out with agitation of the electrolyte.
  • apparatu ⁇ for producing diamond dressers comprising a electrolyte bath for receiving a mould of graphite having a desired internal profile coated with diamonds as cathode, a metal source, typically nickel, as anode and means for passing current between the anode and cathode, whereby metal is deposited on the diamonds, characteri ⁇ ed by mean ⁇ for agitating the electrolyte.
  • the electrolyte may be agitated in any ⁇ uitable way.
  • electrolyte i ⁇ pumped through the mould.
  • the electrolyte i ⁇ preferably pumped through a plate having angled pa ⁇ age ⁇ for the electrolyte.
  • the ⁇ e pa ⁇ ages preferably have an entrance on one radius and an exit on another radius spaced axially from the one radius in order to impart the desired swirling motion to the electrolyte.
  • agitation of the electrolyte in the mould eliminate ⁇ air entrapment in the metal coating and hence reduces poro ⁇ ity.
  • nodule formation ⁇ on the metal coating may be reduced or even eliminated because of the agitation.
  • the invention can produce required nickel depths on the diamonds within a much ⁇ horter time period than hitherto. Typically a desirable depth of nickel may be achieved in under 7 days and even in about 3 1 / 2 days.
  • the electrolyte bath i ⁇ preferably maintained at a temperature above 35°C. Lower temperatures tend to result in uneven nickel growth on the diamonds.
  • the electrolyte temperature is preferably in the range of 39 to 41°C.
  • the electrolyte for nickel plating is preferably nickel ⁇ ulfamate ideally at a concentration in the range of 550 to 650 g/litre.
  • the electrolyte may contain hardener and other additive ⁇ , typically boric acid, nickel chloride and wetting agent.
  • the electrolyte preferably has an acidic pH of above 3.5.
  • the diamonds may be adhered to the graphite mould in any suitable way.
  • a conductive adhesive is preferably used for this purpose, such as a silver ba ⁇ ed adhe ⁇ ive, especially a silver loaded epoxy adhesive.
  • the nickel used for the electro-plating process is preferably in the form of pellets. These are ideally contained in a ba ⁇ ket in the electrolyte within the graphite mould.
  • the basket is preferably made of a conductive material that is not reactive with nickel.
  • the preferred basket for use in the invention is made of titanium.
  • the electro-plating proces ⁇ i ⁇ preferably commenced at low current, which may be dependent on the area to be plated. The larger the area to be plated, the higher is the current used. Typically the start current u ⁇ ed will be in the region of 2 amps and will be raised incremently up to 12-14 amps. The ⁇ tart current may be maintained for 16-24 hours and the final current may be maintained for up to 48 hours.
  • This gradual raising of the current may be achieved manually ie with regular attendance at the apparatus to adjust manually the current up to the maximum current to be used. It is preferred, however, that such raising of the current be independently controlled, ⁇ o that attendance at the apparatus can be kept to a minimum.
  • the raising of the current is pulsed, in other words, a con ⁇ tant current i ⁇ preferably ⁇ witched from one level to another in a pre ⁇ determined, e ⁇ pecially regular, manner.
  • Rai ⁇ ing of the current i ⁇ preferably controlled by a microproce ⁇ or or computer. It is believed that pulsed electro-plating may have several advantages. These advantages include that the metal (nickel) depo ⁇ ited will be finer, purer and ⁇ oother.
  • the rate of metal (nickel) depo ⁇ ition may be increa ⁇ ed.
  • a better plating di ⁇ tribution may be achieved.
  • the electro ⁇ plating process may be commenced at any time during the working day and left to reach it ⁇ maximum operating current at any de ⁇ ired time day or night.
  • the mould can be removed from the electrolyte bath and fini ⁇ hed in the usual way.
  • metal such as nickel
  • the mould can be removed from the electrolyte bath and fini ⁇ hed in the usual way.
  • Traditionally only a single diamond dresser mould is electro-processed at a time in an electrolyte bath. It has now been found that a multiple diamond dresser mould can be proces ⁇ ed in a ⁇ ingle bath using the present invention. After electro-proce ⁇ ing the mould i ⁇ ⁇ plit and each part fini ⁇ hed conventionally.
  • Figure 1 hows ⁇ chematically a prior art apparatus for producing a diamond dresser
  • Figure 2 show ⁇ schematically an apparatus according to the invention for producing a diamond dresser
  • Figure 3 is a section through apparatus of the invention for producing multiple diamond dressers in a single operation.
  • a diamond dres ⁇ er i ⁇ produced conventionally, in the following manner.
  • a graphite mould 10 is prepared having an internal profile 12 matching the de ⁇ ired outer profile of the diamond dresser to be made.
  • a coating 14 of diamonds is adhered to the profile 12 using a conductive adhesive.
  • the diamond coated mould 10 is placed in a bath of electrolyte 16 comprising an aqueous solution of nickel sulfamate.
  • a porous ceramic tube 18 within which is placed a titanium basket 20 containing nickel pellets 22.
  • the nickel pellets form the anode and the mould 10 the cathode of an electrolytic cell.
  • a constant current is applied acros ⁇ the anode and cathode for a sufficient period of time to deposit by electro-plating a layer of nickel 25 on the diamonds of a desired thickness.
  • the deposition period will be around 30-35 days.
  • the titanium ba ⁇ ket of nickel pellet ⁇ is replaced by a bianode, so that the basket can be flushed with water to remove debris.
  • the pH of the electrolyte i ⁇ checked daily. Attempts to reduce the electro-plating time by increasing current density have proved unsuccessful.
  • the resultant nickel coating was uneven, modular and pitted. In mould recesses nickel plating was found to be thinner than elsewhere.
  • the mould After completion of the nickel plating, the mould is removed from the electrolyte bath, a steel shaft fixed in the centre of the mould using a low melting alloy and the graphite mould broken away. Finishing of end faces of the dresser on a lathe completes the production proces ⁇ .
  • Electrolyte Nickel sulfamate with additions of boric acid, nickel chloride and wetting agent. Electrolyte temperature: 40 + 1°C. Electrolyte pH: acidic above 3.5. Current Den ⁇ ity: dependent on surface area to be plated and to be increased gradually during plating period up to, for example 14 amps.
  • Electro-plating time 3.5 days.
  • FIG. 3 of the accompanying drawing ⁇ shows how the principles of the apparatu ⁇ of Figure 2 can be extended to enable more than one diamond dre ⁇ ser to be made at one time.
  • a bath 50 of nickel sulfamate electrolyte (as in Figure 2) contains a cylindrical plastics chamber 52 having a base 54 and a top 56.
  • the base 54 includes an inlet pipe 58 connected to a filter pump (not ⁇ hown) leading to an entry flange 60 which enclo ⁇ e ⁇ a multi-entry manifold 62.
  • a turbulence plate 64 having angled pa ⁇ sage ⁇ 66 therethrough for delivering electrolyte pumped from the electrolyte bath.
  • the passage ⁇ 66 are angled outward and upward ⁇ a ⁇ well a ⁇ into and out of the paper re ⁇ pectively in order to impart a ⁇ wirling or turbulent motion to the electrolyte as it emerges into the chamber 52.
  • Al ⁇ o from the base of the chamber are return pipes 68 for the electrolyte.
  • a graphite mould 70 Seated on the turbulence plate 64 i ⁇ a graphite mould 70 which ha ⁇ three dre ⁇ er form ⁇ 70A, B and C leaving a gap between each.
  • the internal profile of the mould is coated with diamonds 71 in the area of each dresser form. The diamonds being adhered using a silver loaded epoxy adhesive.
  • a porous ceramic tube 72 enclosing a titanium basket 74 containing nickel pellets 76 is fitted in the chamber 52 through its top 56 centrally of the mould 70.
  • the titanium ba ⁇ ket and the graphite mould are connected to a d.c. current ⁇ upply a ⁇ anode and cathode re ⁇ pectively.
  • the operating condition ⁇ for the apparatu ⁇ of Figure 3 were ⁇ ub ⁇ tantially the ⁇ ame as for the apparatu ⁇ of Figure 2, i.e. with the electrolyte being continuously pumped through the chamber 52. After completion of the electro-plating, the mould 70 is removed and the three dresser forms separated and finished off conventionally.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Disintegrating Or Milling (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Abstract

L'invention concerne un procédé de fabrication de dresseurs au diamant par électrodéposition de nickel (76) sur des diamants (71) qui adhèrent à un moule en graphite (70), consistant à agiter l'électrolyte utilisé. On décrit par ailleurs un appareil destiné à la production la fabrication de ces dresseurs au diamant, qui comporte un système d'agitation de l'électrolyte.
PCT/GB1996/002132 1995-09-01 1996-08-30 Fabrication de dresseurs au diamant WO1997009469A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU68335/96A AU6833596A (en) 1995-09-01 1996-08-30 Production of diamond dressers
EP96928616A EP0847455B1 (fr) 1995-09-01 1996-08-30 Fabrication de dresseurs au diamant
DE69602373T DE69602373T2 (de) 1995-09-01 1996-08-30 Herstellung von schleifwerkzeugen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9517854.7A GB9517854D0 (en) 1995-09-01 1995-09-01 Production of diamond dressers
GB9517854.7 1995-09-01

Publications (1)

Publication Number Publication Date
WO1997009469A1 true WO1997009469A1 (fr) 1997-03-13

Family

ID=10780049

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/002132 WO1997009469A1 (fr) 1995-09-01 1996-08-30 Fabrication de dresseurs au diamant

Country Status (6)

Country Link
EP (1) EP0847455B1 (fr)
AT (1) ATE179767T1 (fr)
AU (1) AU6833596A (fr)
DE (1) DE69602373T2 (fr)
GB (1) GB9517854D0 (fr)
WO (1) WO1997009469A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004094111A1 (fr) * 2003-04-24 2004-11-04 Empa Eidgenössische Materialprüfungs- Und Forschungsanstalt Procede pour realiser un outil abrasif
CN104440605A (zh) * 2014-11-11 2015-03-25 河南富耐克超硬材料股份有限公司 一种多角形超硬复合磨料、采用该磨料制备磨具的方法
CN112757178A (zh) * 2021-01-14 2021-05-07 沈阳恒鹏商务服务有限公司 一种金刚石滚轮的上砂方法及金刚石滚轮

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009007992A1 (de) * 2009-02-07 2010-08-19 Ab Skf Beschichtungsanordnung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737162A (en) * 1986-08-12 1988-04-12 Alfred Grazen Method of producing electro-formed abrasive tools

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4737162A (en) * 1986-08-12 1988-04-12 Alfred Grazen Method of producing electro-formed abrasive tools

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004094111A1 (fr) * 2003-04-24 2004-11-04 Empa Eidgenössische Materialprüfungs- Und Forschungsanstalt Procede pour realiser un outil abrasif
CN104440605A (zh) * 2014-11-11 2015-03-25 河南富耐克超硬材料股份有限公司 一种多角形超硬复合磨料、采用该磨料制备磨具的方法
CN104440605B (zh) * 2014-11-11 2017-08-25 富耐克超硬材料股份有限公司 一种多角形超硬复合磨料、采用该磨料制备磨具的方法
CN112757178A (zh) * 2021-01-14 2021-05-07 沈阳恒鹏商务服务有限公司 一种金刚石滚轮的上砂方法及金刚石滚轮

Also Published As

Publication number Publication date
AU6833596A (en) 1997-03-27
EP0847455B1 (fr) 1999-05-06
GB9517854D0 (en) 1995-11-01
ATE179767T1 (de) 1999-05-15
EP0847455A1 (fr) 1998-06-17
DE69602373T2 (de) 2000-01-13
DE69602373D1 (de) 1999-06-10

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