(19)
(11) EP 0 357 378 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.07.1991 Bulletin 1991/30

(43) Date of publication A2:
07.03.1990 Bulletin 1990/10

(21) Application number: 89308729.6

(22) Date of filing: 30.08.1989
(51) International Patent Classification (IPC)5: B23P 15/28, B22F 3/22, B24D 18/00
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 31.08.1988 ZA 886475

(71) Applicant: DE BEERS INDUSTRIAL DIAMOND DIVISION (PROPRIETARY) LIMITED
Johannesburg, Transvaal (ZA)

(72) Inventors:
  • Burnand, Richard Patrick
    Johannesburg Transvaal (ZA)
  • Chapman, Raymond Albert
    Johannesburg Transvaal (ZA)
  • Martell, Trevor John
    Weltevreden Park Transvaal (ZA)
  • Parsons, Stephen Anthony
    Johannesburg Transvaal (ZA)

(74) Representative: Jones, Alan John et al
CARPMAELS & RANSFORD 43 Bloomsbury Square
London, WC1A 2RA
London, WC1A 2RA (GB)


(56) References cited: : 
   
       


    (54) Manufacture of two-component products


    (57) A method is provided for making a product which comprises two layers of different materials bonded to each other. The product will typically be a composite abrasive compact. The method includes the steps of providing a mould (10) having an internal base surface (16) profiled to a desired shape, making a first slurry of a particulate material in a liquid medium which is capable of setting at least to a green state, introducing the slurry (20) into the mould (10), causing the medium to set to produce at least a green state mass (20), removing the green state mass (20) from the base (16), that green state mass (20) having a surface complementary to the profiled internal base surface (16) of the mould (10), depositing, on the profiled complementary surface of the green state mass, a layer of a second slurry containing a different particulate material in a liquid medium which is capable of setting at least to a second green state, and causing the medium of that second slurry to set to produce at least a second green state mass (26) which is bonded to the first green state mass (20).







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