| 摘要 |
The invention relates to a process of making small diameter non-skid metallic studs, for tires, composed of a hard material small rod and of a metallic sheath having an elongated longitudinal axis. The sheath includes a fitting or mounting socket for the small rod, at least one small anchoring collar, and a narrowed intermediate section of smaller diameter than the lower and upper adjacent sections. The process comprises forming a sintered rough shaped sheath of at least 85% of theoretical or maximum density which sheath includes the rod's fitting; introducing the small rod in its fitting, leaving an empty space less than 0.6 mm between the rod and the fitting's base; and bringing the sheath to its final shape through trimming or rolling, in particular, in the narrowed section, while holding tightly the sheath's section surrounding the small rod. |
