| 摘要 |
938,025. Polishing. BELL INTERCONTINENTAL CORPORATION. Dec. 22, 1961 [May 1, 1961], No. 46001/61. Class 60. A method of polishing surfaces by projecting particles of resilient material on to said surfaces with a motion having a linear component and a rotational component comprises feeding the particles between opposed surfaces moving in opposite directions with one surface having a higher rate of surface speed than the other surface, and positioning the surface to be polished in the path of the particles thrown from between the surfaces. Rollers 20, 22, Fig. 1, have their peripheries spaced apart by a distance equal to the crosssection of the resilient pallets 30 and are rotated in the same angular direction. The roller 20 is rotated faster than the roller 22. In a modification the roller 22 is of smaller diameter than the roller 20, the rollers being driven at the same angular rate. In a modification, Fig. 3, the pellets pass between belts 40, 42, the opposed runs moving in opposite directions, and the run which moves towards the work 32 travelling faster than the opposed run. One of the belts may be replaced by one or more rollers. In a modification, Fig. 5, the pairs of pulleys round which the belts pass have their axes non-parallel, e.g. at right angles. The rollers and belts may be roughened and grooved. A further modification, Fig. 6, has a cone 80 and a conical shell 84. One of the conical surfaces, preferably that of the shell, has a higher linear speed than, and rotates oppositely to, the other conical surface. Directional control of the pellets thrown from between the members may be effected by a rigid member having a slight spiral shape and located adjacent the outlet. Paraboloids or hyperboloids may be used instead of cones. Specification 884,942 is referred to. |
