ã€China Aluminum Industry Network】 As we all know, aluminum alloy die steel die casting mold will produce cracks after a period of production. Analysis of Huaxia Mould Network believes that the main reasons for this phenomenon are the following: (1) mold temperature is too high stress is too large (2) mold mold material use 8407, skd61 (3) mold heat treatment hardness is too high (4) Regular maintenance, 5k times1 tempering, 15k times1 tempering 30k times........ Second, to prevent cracking die casting problems? Improve the life of imported die steel? To do the following points? 1. Heat treatment requirements for die-casting molds (dynamic molds and cores) Hardness must be guaranteed at HRC43~48 (materials can be SKD61 or 8407) 2. The mold should be fully preheated before the production of die-casting. Its function is as follows: 2.1 to achieve a good thermal balance of the mold? Make the casting solidification speed and conducive to pressure transfer. 2.2 Maintain the fluidity of the die-casting alloy filled with good moldability and improve the surface quality of the casting. 2.3 Reduce early production failures and increase die casting productivity. 2.4 Reduce the thermal stress of the mold and improve the service life of the mold. The specific specifications are as follows: Alloy Type Aluminum Alloy Zinc Alloy Mold preheating temperature (°C) 180~300 150~200 3. After the new mold is produced for a period of time, the accumulation of thermal stress is the direct cause of cracks in the mold core. To reduce the thermal stress, the mold core and the slider after a certain period of production should be tempered to eliminate thermal stress. specific Need to eliminate the thermal stress production model as follows? The mold type is tempered by the previous tempering. The second tempering is the third tempering. Aluminum alloy <2000 molds <10000 molds <30000 molds Zinc alloy <10000 molds <20000 molds <50000 molds Third, to make the mold can reach a long life of 22 points: 1, high quality molding materials 2, reasonable design mold wall thickness and other mold size 3, try to use inserts Valve 4 Way,4 Way Reversing Valve,Four Way Reversing Valve,4 Way Valve Assembly Suzhou Green New Material Technology Co., Ltd. , https://www.szgreenvip.com