Method of producing a drawing die
AssigneeU.S. Philips Corporation
InventorsAdrianus R. C. Engelfriet, Adriaan J. G. Op Het Veld, Theodorus J. P. Van Vucht
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Abstract
The disclosure relates to the manufacture of wire-drawing dies. The disclosure provides a method for securing a core in a metal housing. The method begins with the clamping of an annulus, consisting of a hardenable metal alloy, around a cylindrical core consisting of a material such as polycrystalline diamond or boron nitride. The core is clamped so as to produce a permanent, radially compressive stress therein. The core-annulus combination is secured in a metal housing of a conventional shape.
Claims4
A method of producing a wire-drawing die comprising the steps of:
- providing a metal annulus having a bore;
- and
- clamping a core directly in the bore of the annulus, said core consisting of a hard, wear-resistant material;
- characterized in that:
- the annulus consists of a metal alloy which can be strengthened by a heat treatment;
- and
- the method further comprises the step of increasing the ulitmate strength of the annulus by a heat treatment, while clamping the core therein.
Dependencies are inferred from the claim text.