| 摘要 |
<p>Apparatus (8) for forming grooves in the surface of an article includes a cage (10) which has a circular cage wall with an annular pattern of holes (16). A plurality of spherical balls (14) having a diameter greater than the cage wall thickness are each rotatably disposed in a respective hole of the cage wall. A pin (12) located within the cage has a circumferential groove (18) in a plane coincident with the plurality of spherical balls and holes in the cage wall so that the pin holds the balls in the groove, the balls protruding through the cage wall and engaging the surface of a workpiece to be grooved so that the balls roll in the groove in the pin and, with movement of the workpiece and apparatus, cause grooves to be formed in the interior surface of the workpiece. The apparatus includes an object (24, 26) at either end of the pin for holding the pin against translational movement relative to the cage so that only rotational movement is imparted to the pin by rotation of the workpiece. To carry out the process of grooving the article (41), a spindle (46) rotates (arrow 52) the workpiece while the apparatus (8) is translated through the bore.</p> |
