MANUFACTURE OF EXTREMELY THIN GRINDING WHEEL HAVING HUB

摘要

PURPOSE:To improve the productivity of an extremely thin grindstone by forming an annular abrasive grain layer from an abrasive grain layer sheet and facilitating the control of the thickness of an individual annular abrasive grain layer and the content of the superabrasive grains. CONSTITUTION:A number of annular abrasive grain layers 11 are obtained through the punching work for an abrasive grain layer sheet which is obtained by dispersing the superabrasive grains into a metal plated phase, by using a die. The obtained annular abrasive grain layer 11 is attached and fixed onto one surface (flange part 10A) side of an annular hub 10 having the diameter smaller than that of the abrasive grain layer 11. Then, the original mold of the grindstone is set into a fine punching mold, and the hub 10 is fitted into a guide post 34, and the outer peripheral part of the abrasive grain layer 11 is nipped by a die 30 and a plate pressing device 33, and further, the inner peripheral part of the abrasive grain layer 11 is nipped by a reverse pressing part 31 and a punch 32. Then, the punch 32 is lowered, and the outer peripheral part of the abrasive grain layer 11 is correctly cut, keeping the center hole of the hub 10 as standard. Then, the outer peripheral part of the abrasive grain layer 11 is applied with the electrolytic etching, and the superabrasive grains on the surface of the abrasive grain layer are exposed, and an extremely thin grinding wheel can be obtained.