Patent ID: 8821217

Claim:
A method for the production in a mold of an annular abrasive grinding wheel having a depressed center with various shapes or a flat shape, for grinders, which comprises the steps of: providing at least one core for forming a through hole for coupling of the grinding wheel centered in a forming cavity of a female part of a mold; depositing, in said mold, at least one of a first layer of at least one abrasive mix and of at least one second layer of at least one abrasive mix; depositing, in said mold, a further one of said second layer of abrasive mix and of said first layer of abrasive mix; closing the mold, by means of a punch, and press and compact said at least one first and second layers of abrasive mix; wherein the step of depositing said second layer of abrasive mix is performed by arranging said second layer of abrasive mix in said mold that has at least one separation surface associated with at least one of the punch and a bottom of the mold in an annular zone intermediate between a region for accommodating said forming core and a perimetric edge of a jacket of the mold, in a zone interposed between said separation surface and the perimetric edge of the jacket of the mold, said separation surface being a step that is defined in at least one of the punch and the bottom of said mold, said mold being provided to comprise a raised portion of said bottom or a protrusion on said punch which form said step separation surface, and wherein, said step for pressing and compacting said at least one first and second layers of abrasive mix, comprises sliding said raised portion or protrusion on said core.