| 摘要 |
1348730 Chucks GLEASON WORKS 6 Dec 1971 [16 Dec 1970] 56431/71 Heading B3B A chuck for the internal gripping of an annular workpiece such as a ring gear comprises a cylindrical body portion 10 with an axial bore 24, the end face 20 of the body constituting a seating against which a workpiece is clamped, a draw bar assembly 30, 50 axially displaceable in the bore 24 and having a head portion 26 which engages the inner peripheral region of a dished spring assembly 32, 34, the axial movement of the draw bar causing axial flexing of the spring assembly which causes radial expansion or contraction of the spring assembly to grip or release the internal surfaces of the workpiece G. In the internal space between the spring members is provided a plastics filler material 38 which constitutes a seal and which is formed with an inner annular cavity 46 which interconnects with an annular groove 44 on the external edge of the spring assembly by radial passages 48. The passages and groove are connected with conduits within the chuck body to facilitate the passage of compressed air to ensure cleaning of the chuck after each operation to remove dirt and material resulting from a machining operation on the workpiece. A valve member 60 which is spring-biased and displaceable by the draw bar head 26 controls the air inlet and outlet passages 68, 66 in the chuck body and whereby excessive movement of the draw bar indicating an oversize bore in a workpiece is detected by a loss of air pressure due to connection between passages 68, 66 by the region 64 of the valve member 60, the change in pressure being sensed by a pressure sensitive switch to give warning of an unproperly chucked workpiece. |
