| 摘要 |
The invention relates to a thread former or tap comprising a shaft, which has a clamping section on one end and a forming or cutting profiled section on the other end. The forming or cutting profiled section is configured as a separate profiled element and can be fixed centrally on the shaft so that it does not rotate, by means of a fixing device. The former or tap is characterised in that the profiled element has a short axial length and a feed cone or chamfer cone on its exterior, that projections and/or recesses, which intermesh in a positive fit, are formed on the end of the shaft and on the side of the profiled element facing towards the shaft and that the profiled element is automatically centred on the shaft, when said element is placed on the shaft. |
