| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a die-casting mold which hardly occurs heat cracks or large cracks even when a cavity surface includes large irregular parts, and to provide a heat treatment method for obtaing the die-casting mold. <P>SOLUTION: The heat treatment method of the die-casting mold including a cavity surface 2, a cavity back surface 3 substantially opposite to the cavity surface 2, and cooling water holes 4, 6 with a base end thereof opened in the cavity back surface 3 and tips 4a, 6a thereof located close to the cavity surface 2 comprises: a step of hardening and tempering the entire die-casting die; a step of re-tempering a portion close to the cavity back surface 3 subsequently; and a step of locally re-tempering portions in a vicinity of inner surfaces of the tips 4a, 6a of the cooling water holes 4, 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
