| 摘要 |
A grindstone exhibiting good abrasive properties while being inexpensive and including stacked layers. The stacked layers include at least one layer of abrasive grain, which in turn includes juxtapose zones of different abrasive grains, one of these zones being proximate to the center of the at least one layer and another of the zones extending along the outer periphery of the at least one layer. A method for forming the at least one layer makes a blank of a first type of abrasive grains and a ring of a second type of abrasive grains. Respective inner and outer contours of the blank are geometrically similar. The ring and the blank are positioned in an inserting position, and then in a subsequent step for making the grindstone, the stack of layer is pressed. Such a grindstone and method can be useful for making cutting-off and surface-treating wheel, as an example. |
