| 摘要 |
<p>The surfaces of a plurality of workpieces are simultaneously ground by two abrading heads, each having a fast moving power driven endless abrasive belt and a backup member engaging the back of the belt. The workpieces are presented to the abrading heads by an indexable turntable that supports a plurality of turrets on which the workpieces are mounted. The abrading heads are located at diametrically opposite sides of the turntable axis so that indexing rotation of the turntable successively brings the turrets and the workpieces thereon under the abrading heads. Forceful engagement between the abrasive belts and the top surface of the workpieces is effected by imparting hydraulically produced pressure on the backup members. The nature of the grinding action performed by the two abrading heads is determined by the shape of the backup members. The depth to which the workpiece surfaces are ground and the rate at which it is done, are accurately adjusted and maintained.</p> |
