| 摘要 |
PURPOSE:To make grinding sand of diamond to adhere strongly on a metal disk, by applying pressure to a pile of solder, grinding sand layer of diamond, solder and another metal disk on the main surface of a metal disk so as to sandwich said pile between carbon components in a vacuum, and heating said pile with electric current. CONSTITUTION:After soldering flux 6a and solder 7a are spread or piled in order on the main surface of a Ni metal disk 5a a ring-shaped grinding sand layer 8 of diamond with a certain width is formed on the rim of the disk 5a. And on this, solder 7b, soldering flux 6b and a Ni alloy disk are piled up in order. This pile is put into a carbon 2 and pressure over its top with carbon cover 3. At the same time, electric voltage is applied between the carbon pan 2 and the carbon cover 3, and Joule's heat is generated to soften the Ni alloy disks 5a, 5b in a vacuum and to thrust the grinding sand of diamond into the Ni alloy disks 5a, 5b, which are completely with the solders 7a, 7b and the two Ni alloy disks 5a, 5b are soldered up with the solders 7a, 7b in one piece.
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