| 摘要 |
PURPOSE:To easily and accurately prepare two types of tire molds according to a master model without requiring the cutting of burr or the discarding treatment thereof, by forming a tread pattern having no vent hole to an inner peripheral surface and forming an annular cast from a thin refractory plate. CONSTITUTION:Casting surfaces 4 due to thin refractory plates 3 extending in a radius direction are mounted on both sides. A large number split tread molding parts 5 having tread patterns 2 having no vent hole formed to the inner peripheral surfaces thereof are arranged in a mold main body in such a state that slits each having the interval almost equal to the thickness of each thin refractory plate are formed between the mutual casting surfaces. Thin refractory plates 3 having a thickness of 0.01-0.5 mm are held between a large number of split model 1 having tread patterns formed to the outer peripheral surfaces thereof so as to protrude in the direction to constitute an annular cast. A metal is cast in the outer periphery thereof and the parts corresponding to the thin refractory plates are cut from the outside to remove the thin refractory plates and respective cast pieces are separated. The split tread molding parts 5 thus obtained are mounted in the mold main body at the intervals almost equal to those of the thin refractory plates. |
