| 摘要 |
A method of making nonskid studs for tires and shoes characterized by making a vertical hole in an upper mold punch so that the lower hole part of said vertical hole may conform to a shank barrel, providing inclined ribs to project inward in the upper part of the lower hole part, making a circular hole in the upper part of the shank barrel of a columnar shank, inserting a superhard tip into said circular hole, fitting the shank in the lower mold and fixing the upper mold and lower mold to respective presses so that when the punch is lowered, the shank barrel may be compressed and fastened to be in the form of petals by the inclined ribs from above and, when the upper mold punch meets the base of the lower mold, the excess material of the shank barrel displaced by the inclined ribs may escape into respective clearances.
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