초록 ▼

A method of and apparatus for injection molding solid steel-banded industrial rubber tires wherein a steel band is inserted in the bottom mold member cavity when the top mold member is in open position. Bite ring and knockout member components are contained in mold member cavity recesses. Closing mo

A method of and apparatus for injection molding solid steel-banded industrial rubber tires wherein a steel band is inserted in the bottom mold member cavity when the top mold member is in open position. Bite ring and knockout member components are contained in mold member cavity recesses. Closing movement of the mold members to mated position seals the bite ring and knockout member components against the steel bank and mold member recess surfaces to prevent leakage of injected rubber compound from the cavity during injection and curing. The mold has an internal wedge member which expands a split ring against the steel band when the mold is closed to prevent band distortion from pressure existing when the mold is injected and the rubber is cured therein to form the tire tread portion which is bonded to the steel band during curing. Mold components knock the cured tire out of the top mold member upon opening the mold. The rubber compound is injected into the mold cavity under pressure at the curing temperature of the compound and this temperature is maintained during curing.

대표청구항 ▼

In a method of injection molding and curing rubber compound with a steel band in a cavity formed in a mold to bond rubber injected into the cavity to the band during curing to form a solid steel-banded industrial rubber tire; the steps of providing separated top and bottom mold plate members having

In a method of injection molding and curing rubber compound with a steel band in a cavity formed in a mold to bond rubber injected into the cavity to the band during curing to form a solid steel-banded industrial rubber tire; the steps of providing separated top and bottom mold plate members having cavity portions therein; locating in recesses formed in respective plate members top and bottom hardened steel bite rings having conical circumferential surfaces which are complementary to conical surfaces formed in said recesses; providing annular V-shaped projections on said bite rings; biasing said top bite ring away from said top plate member conical recess portion; inserting a steel band in the bottom mold plate member cavity portion; piloting said steel band on the bottom bite ring during insertion to a position concentric with the bottom mold plate cavity portion; relatively moving said top and bottom mold plate members toward each other to mate said plate members and form a closed mold cavity; during said relative movement piloting said biased top bite ring into concentric engagement with the upper end of said steel band; meanwhile engaging said top and bottom bite ring annular V-formations with the ends of said steel band and wedge seating by band metal deformation said V-shaped formations into the metal band ends to seal the bite rings against the band ends; meanwhile seal-pressure-seating said conical bite ring surfaces in said plate member conical recess portions, and also pressure-mating parting faces of said top and bottom mold plates; holding the steel band under pressure against interior distortion; pressure injecting rubber compound at compound curing temperature into the cavity formed by the plate member cavity portions and the steel band; curing the injected rubber and maintaining molding pressure on the mated mold plate members and the seated and sealed bite rings and steel band during curing; maintaining the temperature of the injected rubber compound at its curing temperature during curing; then after curing, separating the mold plate members, and during initial separation knocking the cured steel-banded tire out of the top mold plate member cavity; then releasing distortion preventing pressure from the steel band; and then removing said tire from the bottom mold plate member cavity.