A vertical die set for manufacturing hard alloy rod by die pressing is composed of upper and lower punch heads, die sleeve with demoulding conicity and split die core which demoulding conicity. Its manufacture includes such steps as making the demoulding conicity of die sleeve and die core, grinding the inner surface of die sleeve, longitudinally cutting die core to divide it into several blocks, splicing them, dot welding on end face, grinding the external and internal surfaces of die core, and removing the weld scar. |