EP0847455B1 - Production of diamond dressers - Google Patents

Production of diamond dressers Download PDF

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Publication number
EP0847455B1
EP0847455B1 EP96928616A EP96928616A EP0847455B1 EP 0847455 B1 EP0847455 B1 EP 0847455B1 EP 96928616 A EP96928616 A EP 96928616A EP 96928616 A EP96928616 A EP 96928616A EP 0847455 B1 EP0847455 B1 EP 0847455B1
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EP
European Patent Office
Prior art keywords
electrolyte
mould
current
nickel
diamonds
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Expired - Lifetime
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EP96928616A
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German (de)
French (fr)
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EP0847455A1 (en
Inventor
Peter David Morris
Stephen Leslie Noakes
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.)
Consort Precision Diamond Co Ltd
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Consort Precision Diamond Co Ltd
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Publication date
Application filed by Consort Precision Diamond Co Ltd filed Critical Consort Precision Diamond Co Ltd
Publication of EP0847455A1 publication Critical patent/EP0847455A1/en
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    • 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

  • This 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 components 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.
  • US Patent Specification No. 4737162 discloses a method of producing precision abrasive articles by electroforming for use in metal removal operations.
  • diamond particles are packed firm between the inner circumferential surface of a mould and a centrally located metallic grid.
  • Electrolyte for metal deposition selected from Ni, Cu, Fe, Sn and Ag, is then pumped from a reservoir into the space containing the abrasive diamond particles.
  • An electrical cathode connection is made to the mould and an anodic connection made to the anode.
  • Metallic deposition around the diamond particles occurs on the inner annular surface of the mould and continues until a matrix supporting the diamond particles is formed.
  • the mould with the matrix is then removed to receive the core material and the core is then machined to finished dimensions.
  • the method is carried out at temperatures up to 93.3°C and without any movement of the mould.
  • the electro-plating process is carried out slowly at a low current density.
  • the electro-plating process can take as long as 32 days. That length of time increases costs and causes considerable delays between receipt of and completion of an order for a diamond dresser.
  • each electro-plating process requires a large area of operation as each mould has to be in its own electrolyte bath and each bath requires 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 while a swirling motion is imparted to the electrolyte.
  • apparatus for producing diamond dressers comprising an 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, characterised by means for imparting a swirling motion to the electrolyte.
  • a swirling motion may be imparted to the electrolyte in any suitable way and preferably comprises pumping means.
  • the electrolyte is preferably pumped through a plate having angled passages for the electrolyte. These passages preferably have an entrance on one radius and an exit on another radius spaced axially from the one radius in order to impart the swirling motion to the electrolyte.
  • agitation of the electrolyte by imparting a swirling motion thereto in the mould eliminates air entrapment in the metal coating and hence reduces porosity. Furthermore, nodule formations on the metal coating may be reduced or ever eliminated because of the agitation. Further, it has been found that the invention can produce required nickel depths on the diamonds within a much shorter 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 is 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 sulfamate ideally at a concentration in the range of 550 to 650 g/litre.
  • the electrolyte may contain hardener and other additives, 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 based adhesive, 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 basket 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 process is 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.
  • the start current used will be in the region of 2 amps and will be raised incremently up to 12-14 amps. The start 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, so that attendance at the apparatus can be kept to a minimum.
  • the raising of the current is pulsed, in other words, a constant current is preferably switched from one level to another in a predetermined, especially regular, manner. Raising of the current is preferably controlled by a microprocessor or computer.
  • pulsed electro-plating may have several advantages. These advantages include that the metal (nickel) deposited will be finer, purer and smoother. Secondly by raising the limiting current density, the rate of metal (nickel) deposition may be increased. Thirdly, there may be improved metal adhesion to the substrate. Fourthly, a better plating distribution may be achieved. Finally, with a programmable means for raising the current, the electro-plating process may be commenced at any time during the working day and left to reach its maximum operating current at any desired time day or night.
  • the mould can be removed from the electrolyte bath and finished in the usual way.
  • a diamond dresser is produced conventionally, in the following manner.
  • a graphite mould 10 is prepared having an internal profile 12 matching the desired 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 across 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 basket of nickel pellets is replaced by a bianode, so that the basket can be flushed with water to remove debris.
  • the pH of the electrolyte is 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 process.
  • FIG. 3 of the accompanying drawings shows how the principles of the apparatus of Figure 2 can be extended to enable more than one diamond dresser 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 shown) leading to an entry flange 60 which encloses a multi-entry manifold 62.
  • a turbulence plate 64 Above the manifold. 62 is a turbulence plate 64 having angled passages 66 therethrough for delivering electrolyte pumped from the electrolyte bath.
  • the passages 66 are angled outward and upwards as well as into and out of the paper respectively in order to impart a swirling or turbulent motion to the electrolyte as it emerges into the chamber 52.
  • return pipes 68 for the electrolyte.
  • a graphite mould 70 Seated on the turbulence plate 64 is a graphite mould 70 which has three dresser forms 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 basket and the graphite mould are connected to a d.c. current supply as anode and cathode respectively.

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  • 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)
  • Carbon And Carbon Compounds (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Disintegrating Or Milling (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Abstract

A process for producing diamond dressers by electro-plating nickel (76) onto diamonds (71) adhered to a graphite mould (70) includes the step of agitating the electrolyte and apparatus for producing such diamond dressers includes means for agitating the electrolyte.

Description

This 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 components 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.
US Patent Specification No. 4737162 discloses a method of producing precision abrasive articles by electroforming for use in metal removal operations. In this method diamond particles are packed firm between the inner circumferential surface of a mould and a centrally located metallic grid. Electrolyte for metal deposition, selected from Ni, Cu, Fe, Sn and Ag, is then pumped from a reservoir into the space containing the abrasive diamond particles. An electrical cathode connection is made to the mould and an anodic connection made to the anode. Metallic deposition around the diamond particles occurs on the inner annular surface of the mould and continues until a matrix supporting the diamond particles is formed. The mould with the matrix is then removed to receive the core material and the core is then machined to finished dimensions. The method is carried out at temperatures up to 93.3°C and without any movement of the mould.
To avoid a build up of stress or porosity in the nickel and to avoid excessive over plating, the electro-plating process is carried out slowly at a low current density. Typically the electro-plating process can take as long as 32 days. That length of time increases costs and causes considerable delays between receipt of and completion of an order for a diamond dresser. Furthermore, each electro-plating process requires a large area of operation as each mould has to be in its own electrolyte bath and each bath requires 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.
According to a first aspect of this invention, there is provided 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 while a swirling motion is imparted to the electrolyte.
According to a second aspect of this invention there is provided apparatus for producing diamond dressers comprising an 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, characterised by means for imparting a swirling motion to the electrolyte.
A swirling motion may be imparted to the electrolyte in any suitable way and preferably comprises pumping means. The electrolyte is preferably pumped through a plate having angled passages for the electrolyte. These passages preferably have an entrance on one radius and an exit on another radius spaced axially from the one radius in order to impart the swirling motion to the electrolyte.
It is believed that agitation of the electrolyte by imparting a swirling motion thereto in the mould eliminates air entrapment in the metal coating and hence reduces porosity. Furthermore, nodule formations on the metal coating may be reduced or ever eliminated because of the agitation. Further, it has been found that the invention can produce required nickel depths on the diamonds within a much shorter time period than hitherto. Typically a desirable depth of nickel may be achieved in under 7 days and even in about 31/2 days.
The electrolyte bath is 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 sulfamate ideally at a concentration in the range of 550 to 650 g/litre. The electrolyte may contain hardener and other additives, 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 based adhesive, 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 basket 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 process is 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 used will be in the region of 2 amps and will be raised incremently up to 12-14 amps. The start 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, so that attendance at the apparatus can be kept to a minimum. Preferably the raising of the current is pulsed, in other words, a constant current is preferably switched from one level to another in a predetermined, especially regular, manner. Raising of the current is preferably controlled by a microprocessor or computer.
It is believed that pulsed electro-plating may have several advantages. These advantages include that the metal (nickel) deposited will be finer, purer and smoother. Secondly by raising the limiting current density, the rate of metal (nickel) deposition may be increased. Thirdly, there may be improved metal adhesion to the substrate. Fourthly, a better plating distribution may be achieved. Finally, with a programmable means for raising the current, the electro-plating process may be commenced at any time during the working day and left to reach its maximum operating current at any desired time day or night.
Once a desired depth of metal, such as nickel, has been deposited in the mould, the mould can be removed from the electrolyte bath and finished 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 processed in a single bath using the present invention. After electro-processing the mould is split and each part finished conventionally.
This invention will now be further described, by way of example only, with reference to the accompanying drawings, in which:-
  • Figure 1 shows schematically a prior art apparatus for producing a diamond dresser;
  • Figure 2 shows schematically an apparatus according to the invention for producing a diamond dresser; and
  • Figure 3 is a section through apparatus of the invention for producing multiple diamond dressers in a single operation.
    • Referring to Figure 1 of the accompanying drawings, a diamond dresser is produced conventionally, in the following manner. A graphite mould 10 is prepared having an internal profile 12 matching the desired 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. Within the mould 10 is placed 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 across 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. Usually the deposition period will be around 30-35 days. Periodically, the titanium basket of nickel pellets is replaced by a bianode, so that the basket can be flushed with water to remove debris. Also, the pH of the electrolyte is 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.
    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 process.
    Referring now to Figure 2 of the accompanying drawings it has been found that agitation of the electrolyte allows the current density to be increased and hence the electro-plating time to be reduced. A main difference according to the invention over the prior art process, as illustrated in Figure 2 of the drawings, is that the electrolyte 18 is pumped through a baffle plate 24 having angled passages 26 therethrough which are arranged to promote a swirling motion or turbulent flow pattern for the electrolyte through the mould. Thus, the passages 26 have a lower entry on one radius and an upper exit on a different radius, the respective radu being axially spaced from each other.
    The electro-plating conditions used in the apparatus of Figure 2 were as follows:
  • 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 Density: 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.
    • It was found that using a combination of electrolyte turbulence, higher electrolyte temperature than hitherto and higher current density than hitherto, a relatively uniform nickel coating could be achieved which was generally free of pitting.
    Figure 3 of the accompanying drawings shows how the principles of the apparatus of Figure 2 can be extended to enable more than one diamond dresser 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 shown) leading to an entry flange 60 which encloses a multi-entry manifold 62. Above the manifold. 62 is a turbulence plate 64 having angled passages 66 therethrough for delivering electrolyte pumped from the electrolyte bath. The passages 66 are angled outward and upwards as well as into and out of the paper respectively in order to impart a swirling or turbulent motion to the electrolyte as it emerges into the chamber 52. Also from the base of the chamber are return pipes 68 for the electrolyte.
    Seated on the turbulence plate 64 is a graphite mould 70 which has three dresser forms 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 basket and the graphite mould are connected to a d.c. current supply as anode and cathode respectively.
    The operating conditions for the apparatus of Figure 3 were substantially the same as for the apparatus 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.

    Claims (30)

    1. 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, placing the mould in electrolyte, and electro-plating a metal onto the diamonds, characterized in that the electro-plating process is carried out while a swirling motion is imparted to the electrolyte.
    2. A process as claimed in claim 1, characterized in that the electrolyte is pumped through the mould.
    3. A process as claimed in claim 1 or 2, characterized in that the electrolyte is pumped through a plate having angled passages for the electrolyte.
    4. A process as claimed in claim 3, characterized in that the passages have an entrance on one radius and an exit on another radius spaced axially from the one radius.
    5. A process as claimed in any one of claims 1 to 4, characterized in that the electrolyte is maintained at a temperature above 35°C.
    6. A process as claimed in claim 5, characterized in that the electrolyte temperature is maintained in the range of 39 to 41°C.
    7. A process as claimed in any one of claims 1 to 6, characterized in that the metal is nickel.
    8. A process as claimed in claim 7, characterized in that the electrolyte is aqueous nickel sulfamate.
    9. A process as claimed in claim 8, characterized in that the electrolyte concentration is in the range of 550 to 650 g/litre.
    10. A process as claimed in claim 8 or 9, characterized in that the electrolyte has an acidic pH of above 3.5.
    11. A process as claimed in any one of claims 1 to 10, characterized in that the diamonds are adhered to the profile by means of a conductive adhesive.
    12. A process as claimed in claim 11, characterized in that the adhesive is a silver based adhesive.
    13. A process as claimed in claim 12, characterized in that the adhesive is a silver loaded epoxy adhesive.
    14. A process as claimed in any one of claims 7 to 13, characterized in that the nickel is in the form of pellets.
    15. A process as claimed in any one of claims 1 to 14, characterized in that the electro-plating is commenced at low current and raised gradually.
    16. A process as claimed in claim 15, characterized in that the electro-plating is commenced at a current in the region of 2 amps.
    17. A process as claimed in claim 15 or 16, characterized in that the current is raised to 12 to 14 amps.
    18. A process as claimed in claim 15, 16 or 17, characterized in that the start current is maintained for 16 to 24 hours.
    19. A process as claimed in any one of claims 1 to 18, characterized in that the final current is maintained for up to 48 hours.
    20. A process as claimed in any one of claims 15 to 19, characterized in that raising of the current is pulsed.
    21. Apparatus for producing diamond dressers comprising an electrolyte bath for receiving a mould of graphite having a desired internal profile coated with diamonds as cathode, a metal source as anode and means for passing electric current between the anode and cathode whereby metal is deposited on the diamonds, characterized by means for imparting a swirling motion to the electrolyte.
    22. Apparatus as claimed in claim 21, characterized in that the means arranged to impart a swirling motion to the electrolyte comprises pump means.
    23. Apparatus as claimed in claim 22, characterized by a plate through which the electrolyte is pumped, the plate having angled passages therethrough.
    24. Apparatus as claimed in claim 23, characterized in that the passages of the plate have an entrance on one radius and an exit on another radius spaced axially from the one radius.
    25. Apparatus as claimed in any one of claims 21 to 24, characterized by means for heating the electrolyte.
    26. Apparatus as claimed in any one of claims 21 to 25, characterized in that the metal is contained in a basket in the electrolyte within the graphite mould.
    27. Apparatus as claimed in claim 26, characterized in that the basket is made of conductive material that is not reactive with nickel.
    28. Apparatus as claimed in claim 26 or 27, characterized in that the basket is made of titanium.
    29. Apparatus as claimed in any one of claims 21 to 28 further characterized by means for altering the applied current.
    30. Apparatus as claimed in claim 29, characterized by means for altering the applied current in a pulsed manner.
    EP96928616A 1995-09-01 1996-08-30 Production of diamond dressers Expired - Lifetime EP0847455B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    GB9517854 1995-09-01
    GBGB9517854.7A GB9517854D0 (en) 1995-09-01 1995-09-01 Production of diamond dressers
    PCT/GB1996/002132 WO1997009469A1 (en) 1995-09-01 1996-08-30 Production of diamond dressers

    Publications (2)

    Publication Number Publication Date
    EP0847455A1 EP0847455A1 (en) 1998-06-17
    EP0847455B1 true EP0847455B1 (en) 1999-05-06

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    Application Number Title Priority Date Filing Date
    EP96928616A Expired - Lifetime EP0847455B1 (en) 1995-09-01 1996-08-30 Production of diamond dressers

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    EP (1) EP0847455B1 (en)
    AT (1) ATE179767T1 (en)
    AU (1) AU6833596A (en)
    DE (1) DE69602373T2 (en)
    GB (1) GB9517854D0 (en)
    WO (1) WO1997009469A1 (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE102009007992A1 (en) * 2009-02-07 2010-08-19 Ab Skf Coating arrangement comprises a coating carrier and a layer arranged on surface of the carrier, where the layer is formed by coating of particles in quasi manner and is fixed with galvanically applied metallic materials on the surface

    Families Citing this family (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    WO2004094111A1 (en) * 2003-04-24 2004-11-04 Empa Eidgenössische Materialprüfungs- Und Forschungsanstalt Method for the production of an abrasive tool
    CN104440605B (en) * 2014-11-11 2017-08-25 富耐克超硬材料股份有限公司 A kind of superhard abrasive compound of polygonal, the method for preparing using the abrasive material grinding tool
    CN112757178A (en) * 2021-01-14 2021-05-07 沈阳恒鹏商务服务有限公司 Sand feeding method of diamond roller and diamond roller

    Family Cites Families (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 (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE102009007992A1 (en) * 2009-02-07 2010-08-19 Ab Skf Coating arrangement comprises a coating carrier and a layer arranged on surface of the carrier, where the layer is formed by coating of particles in quasi manner and is fixed with galvanically applied metallic materials on the surface

    Also Published As

    Publication number Publication date
    GB9517854D0 (en) 1995-11-01
    DE69602373D1 (en) 1999-06-10
    ATE179767T1 (en) 1999-05-15
    DE69602373T2 (en) 2000-01-13
    EP0847455A1 (en) 1998-06-17
    AU6833596A (en) 1997-03-27
    WO1997009469A1 (en) 1997-03-13

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