| 摘要 |
The invention relates to an extrusion tool for the production of a drill blank with at least one inner, helically extending flushing bore and consisting of a plastic raw material comprising hard metal or ceramic, having a die delimiting a forming space and having a mandrel which is arranged in the inlet region of the latter and, outside the longitudinal axis of the die, carries at least one elastically deformable wire projecting into the die. The inner wall of the die has a helical arrangement, due to which the raw material passing through the die undergoes twisting. …<??>In order, in particular, to be able to change the helix angle of the helix of the tubular blank without replacing the die, it is proposed that the die (10) consist of a plurality of abutting annular discs (10a) which are designed to be locked in different positions relative to one another, in particular different positions around the longitudinal axis (25) of the die. …<IMAGE>… |
