How to prevent die casting die cracking

A lot of die-casting mold manufacturing enterprises in the process of casting die die often encounter die-casting mold cracking situation, how should we avoid this situation?

In order to prevent the die-casting mold cracking problem and improve the service life of the mold, a die-casting mold, such as moving, setting the mold, core heat treatment requirements: hardness to ensure that HRC43 ~ 48, material selection SKD61 or 8407.
Mold in the die-casting production should be fully warm-up before the action, its role is as follows:
1, die-casting mold should be able to achieve better heat balance, so that the die-casting mold solidification more uniform, is conducive to the transmission of pressure;
2, to maintain effective mobility, fill the die casting die in the die when the good formability and improve the surface quality of die casting;
3, to reduce the poor pre-production and the corresponding increase in the productivity of die casting;
4, to reduce the die-casting mold heat exchange stress, lost wax casting, improve the life of the mold.
Die-casting molds die-casting molds under great pressure, alternating use must be noted in order to obtain molds from the mold material, design, processing, heat treatment and operating life, if the need to improve the service life, the mold can be achieved:
1, the choice of higher quality die-casting mold materials;
2, the need for a reasonable design of the mold wall thickness and the size of the mold;
3, pay attention to roughing after roughing;
4, the use of the correct heat treatment, quenching to be fast enough;
5, thoroughly polished to remove EDM harassment quality layer;
6, the surface is not highly polished
7, to minimize the use of aluminum, to speed up the injection rate;
8 to ensure proper cooling of the mold, the temperature of the cooling water must be maintained at 40 to 50 ° C;
9, in the temporary downtime, you can try to shape and reduce the amount of cooling water to avoid the boot when the die-casting mold to withstand thermal shock;
10, the coolant should be turned off at the maximum temperature of the mold surface