| 摘要 |
A workpiece holder for a vertical broaching machine for broading annular workpieces is particularly useful for simultaneous broaching of two ball-bearing races in the rings of homokinetic joints. A workpiece support, rotatable relative to a baseplate about a common axis and accepting the workpiece coaxially by means of a tightening device, is nonrotatably connected to a double-ended piston which can be subjected to the action of pressure-oil, the piston being guided rotatably and axially displaceably between two end positions in a cylinder. Complementary set of teeth are provided at one end of the piston and on a facing surface, nonrotatably connected to the baseplate, these teeth being in mesh when the piston is in the first end position, thus centering the piston and holding it in a nonrotational manner. A first pressure-oil connection terminates in the chamber delimited by the teeth, the piston being displaced axially to the other end position when the chamber is pressurized with pressure-oil, with the teeth being out of mesh when the piston is in the latter position. An additional chamber, connected to a second pressure-oil connection, is formed between the piston and the cylinder, the piston being displaced back to the first end position when this additional chamber is charged with pressure oil. |
