| 摘要 |
PURPOSE:To prevent occurrence of any blemish on the inner wall face of an introduction hole for grinding liquid and enhance the strength as a grindstone integrated body by forming smooth introduction grooves for grinding liquid on the meeting faces between partial grindstones to be superposed on each other by means of the forming face of a press die. CONSTITUTION:Grindstone material including uniformly mixed grinding particles and binder is filled in a press die. Thereafter, it is compressed and formed by the press to obtain disc type partial grindstones 12, 14 and at the same time, grooves 30, 40 for introducing grinding liquid are formed smoothly on one face of each of the partial grindstones in such a manner that its circumferential grinding face 16 communicates with its central hole 18. The partial grindstones 12, 14 thus formed are superposed with each other at one face and combined integrally so that an introduction hole 20 for grinding liquid can be formed by introduction grooves 30, 40 for grinding liquid, whereby the wet type combined grindstone for grinding is obtained.
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