MANUFACTURE OF POLYGONAL METALLIC TUBE HAVING OUTER FACE BULGED PART

摘要

PURPOSE:To obtain polygonal metallic tube having excellent characteristic in manufacturing equal working ratio polygonal tube which has fixed inner face and has a bulged part on outer face, by flat grinding a specified face of a polygonal tube of equal thickness and grinding successively by making the ground face as a reference face. CONSTITUTION:The hexagonal nuclear fuel covering tube of a fast breeder has fixed shape of inner face and has a bulged part in the center of outer face, and the whole is formed at equal working ratio. The bulged part is formed by grinding outer face of a hexagonal tube of equal thickness formed at equal working ratio excepting the bulged part, and grinding successively by the use of a jig by making the ground face as a reference face. Thus, the material of the tube is worked in an equal working ratio as a whole and a titled polygonal metallic tube that conforms to desired specification can be formed.