| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a jacket insert die which can reduce the influence of thermal deformation due to the heat of molten metal more than before. <P>SOLUTION: In the jacket insert die 20, four cylindrical parts 28 having a nearly cylindrical shape are formed continuously. The number of cylindrical parts 28 is a number corresponding to the number of bores of a cylinder block cast with a mold 2. Each cylindrical part 28 has a forming part 22 and a base. A constriction part 29 is provided in a connection part of adjoining cylindrical parts 28. At a plurality of points in the jacket insert die 20, spaces 40 is formed that extend along the axial direction of the cylindrical parts 28. The spaces 40 are formed in each of the constriction parts 29 and in an outermost peripheral part 28a of each cylindrical part 28 in the direction (width direction) orthogonal to the connecting direction of two or more cylindrical parts 28. <P>COPYRIGHT: (C)2012,JPO&INPIT |
