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(11) | EP 0 463 846 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Grinding method and apparatus |
(57) A grinding method is provided which is capable of uniformly and precisely grinding
objects in a short time, softening shocks produced when the rotation of a grinding
barrel is changed between the forward direction and the backward direction to thereby
eliminate bruises of the surface of grounded objects, coping with grinding for a large
number of objects to be ground in a small quantity or a heavy-weight or a large-size
object to be ground, and preventing contacts and collisions between objects to be
ground. The grinding method comprises the steps of rotatably mounting not less than
one grinding barrel (8) at locations away from the central axis (3) of a rotary drum
(2), enclosing a grinding material and objects to be ground in the grinding barrels
(8), rotating the grinding barrels (8) in the directions identical to and opposite
to the direction in which the rotary drum (2) is rotated, and grinding the objects
to be ground. A grinding apparatus for implementing the above-mentioned method is
also provided. |