| 摘要 |
A shell-type internal broach assembly including a number of annular insert mounting shells interleaved with a number of annular spacers, and mounted on an arbor. The annular insert mounting shells are sufficiently short so as to permit the use of travelling-wire EDM manufacturing methods. As a result, inserts can be precisely and accurately located and secured to the annular insert mounting shells, thereby presenting a highly repeatable broaching configuration to a workpiece. The precision by which the annular insert mounting shells are formed also promotes concentricity of the annular insert mounting shells, which further promotes the accurate and precise placement of the inserts relative to the longitudinal axis of the arbor. The use of the annular spacers also effectively reduces the cost of the internal broach assembly, in that the simple cylindrical outer surface of the annular spacers are less expensive to manufacture than the complex surface features necessary to accurately receive the inserts on the periphery of the annular insert mounting shells. The number and length of the annular spacers used can be varied in according with the strength required by the inserts to resist deformation by the cutting forces. |
