| 摘要 |
In production of a lock nut used for fastening in cooperation with a bolt, a tubular material of a polygonal transverse cross section is machined into a crude block integrally made up of an angled main body and a truncated cone having a common, circular cente hole which is then tapped, a series of crude blocks are periodically and intermittently supplied to and registered at a shaping center provided on a holder assembly, each crude block is compressed with a compression mould to deform its tapped hole into a polygonal transverse cross section in the region of its truncated cone, and a lock nut thus produced are delivered out of the shaping center after compression. The process is fully automatized and the deformed transverse cross section of the rapped hole assures halmless, elastic, blanced fastening on a bolt in screw engagement of the lock nut.
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