MOLD MATERIAL AND METHOD FOR FORMING GLASS MATERIAL USING THE MOLD MATERIAL

PROBLEM TO BE SOLVED: To reduce production cost by acquiring a formed body at a high yield when a cylindrical glass product is formed. SOLUTION: Regarding a mold material wherein a glass material is heated and melted so as to form the outline of a cylindrical glass product, the mold material comprises: a bottom plate; a cylindrical part arranged on the bottom plate in such a manner that either opening part is in contact with the bottom plate; a guide member having an outer diameter almost same as the inside diameter of the cylindrical part and freely slidably movable on the inner circumferential face of the cylindrical part to the upper and lower directions; a pressing fixture with an almost columnar shape arranged at the lower face of the guide member and in which the corner parts of a pressing face pressing the upper face of the glass material placed on the bottom plate in the cylindrical part are subjected to chamfering; and a load plate applying a load on the pressing fixture. COPYRIGHT: (C)2010,JPO&INPIT