| 摘要 |
<p>The invention relates to a method of manufacturing a drawing die, in which a core of, for example, natural of synthetic diamond is clamped in the cavity intended for this purpose by deforming a cylinder which is made of, for example, a copper alloy. …<??>A properly centred core is obtained through the use of a punch by means of which the core is clamped during the deformation of the cylinder; in this way tilting of the core is precluded and it is not covered with material of the annulus in places where this is undesirable.</p> |
