| 摘要 |
1296771 Severing by grinding NORTON CO 20 Jan 1970 [21 Jan 1969] 2763/70 Heading B3D [Also in Division B5] A method of cutting plates P of complex shape from a block of material B Fig. 2 comprises moving the block past a blade 60 which is curved and is oscillated along an arc in the direction of its length. In apparatus described for performing the method the blade 60 is supported at its ends by arms 56a 56b of a frame 56. The frame 56 is pivotally mounted on a shaft 52, Fig. 1, and is oscillated by means of a cam 66 which engages in a slot in arm 56c. The cam is driven from a motor M. The frame 56 is supported above a machine base 10 provided with a guideway 16, Fig. 1. for a sliding table 18. The table 18 has a work support 26, Fig. 2 pivotally mounted thereon by a pin 28, and the support 26 carries a filler block 30 which supports the block B and on which the block B, which may be graphite, is clamped by a clamp screw 34. In operation of the apparatus the block B is clamped on the work support 26, and the table 18 is advanced along the guideway 16 so that the blade forms a part-cylindrical cut in the block. When the pin 28 reaches a position in which it lies in the plane of the frame 56, the support 26 may be pivoted about pin 28 to cause the blade to form a cut which is curved in two mutually perpendicular directions. The blade may have portions having different radii of curvature. It may be a metal blank with abrasive material e.g. diamonds, tungsten carbide, ceramic, or metal oxide, embedded therein. It may have rectangular, square, or circular cross-section. |
