LOST PATTERN, METHOD FOR PRODUCING LOST PATTERN, AND METHOD FOR PRODUCING DIE USING LOST PATTERN

摘要

A light-weight die exhibiting necessary rigidity is obtained. First, an original pattern for a lost pattern is produced by cutting a lump of a quenchable material. The original pattern is provided with: a three-dimensional reticule structure which has a plurality of bar members, and in which the connecting points where the ends of the bar members are connected are dispersed within a three-dimensional space; and a plurality of block members, the relative positional relationship of which being secured by means of the reticule structure. Subsequently, at least a section of some of the bar members forming the original pattern is removed and is replaced with a tube member. Then, a full mold casting process is performed by using the lost pattern in which a section of some of the bar members are replaced with the tube members as mentioned above. The positional relationship between the block members on which the necessary molding surfaces of a die are formed is secured by means of the three-dimensional reticule structure, thereby ensuring necessary rigidity. The weight of the die is reduced because a three-dimensional reticule structure is used. Moreover, the amount of gas produced during the full mold casting process is reduced and the quality of the cast is not impaired because a section of some of the bar members are replaced with tube members.