hammasrataste hammaste kuju ja pinnakvaliteedi tõstmine plastseid deformatsioone kasutades; pindsilumine toimub töödeldava hammasratta ja suure kõvadusega tööriisthammasratta hambumises, mille tulemusena toimub hammasratta hammaste tööpindade silumine ja kalestumine (vrd hammasratta plankimine), a plastic deformation process in which one or more hardened gear-shaped dies are rolled in contact with the gear, and pressure is applied by the dies to effect cold working of gear teeth; the gear teeth are strengthened through strain hardening, and surface finish is improved (compare: gear lapping)