As we all know, aluminum alloy die steel die-casting die will have cracks after a period of production.
The main reasons for this phenomenon are as follows:
- The mold temperature is too high and the stress is too large
- Mould core material uses 8407, skd61
- The mold heat treatment hardness is too high
- Regular maintenance, 5k times1 tempering, 15k times1 tempering 30k times……
To prevent die-casting mold cracking and increase the service life of imported mold steel
The following points must be done:
- 1. The heat treatment requirements of the forming part of the die-casting mold (moving, fixed mold core, core): the hardness must be guaranteed to be HRC43~48 (the material can be SKD61 or 8407)
- 2. The mold should be fully preheated before die-casting production. Its functions are as follows:
- 2.1 Make the mold reach a better thermal balance, make the casting solidification rate uniform and facilitate pressure transmission.
- 2.2 Maintain the fluidity of the die-casting alloy when filled, have good formability and improve the surface quality of the casting.
- 2.3 Reduce early production defects and improve die-casting productivity.
- 2.4 Reduce the thermal alternating stress of the mold and increase the service life of the mold. The specific specifications are as follows:Alloy type Aluminum alloy / Zinc alloy Mold preheating temperature (℃) 180~300 150~200
After the new mold is produced for a period of time
The accumulation of thermal stress is the direct cause of mold core cracking. In order to reduce thermal stress, the mold core and slider should be tempered to eliminate thermal stress after being put into production for a certain period of time. specific
The production modes that need to eliminate thermal stress are as follows:
| Mold Type | First Tempering | Second Tempering | Third Tempering |
| Aluminum alloy | <2000 mold times | <10000 mold times | <30000 mold times |
| Zinc alloy | <10000 mold times | <20000 mold times | <50000 mold times |
22 tips to make the mould reach a long life
- 1. High-quality mold materials
- 2. Reasonably design mold wall thickness and other mold dimensions
- 3. Try to use inserts
- 4. Choose the largest possible corner R under possible conditions
- 5. The distance between the cooling water channel and the profile and corner must be large enough
- 6. Stress tempering should be removed after rough machining
- 7. Heat treatment is correct, and quenching and cooling must be fast enough
- 8. Thoroughly polish and remove the EDM scum layer
- 9. The profile should not be highly polished
- 10. The mold surface should be oxidized
- 11. If selective nitriding, the infiltration layer should not be too deep
- 12. Preheat the mold to the recommended temperature in the correct way
- 13. Slow hammer speed should be used to start die-casting 5-10 pieces
- 14. On the premise of obtaining qualified products, try to reduce the temperature of the molten aluminum as much as possible
- 15. Do not use too high injection speed of aluminum liquid
- 16. Ensure that the mold is properly cooled, and the temperature of the cooling water should be kept at 40~50℃
- 17. For temporary shutdown, try to close the mold and reduce the amount of cooling water to avoid thermal shock to the mold when restarting
- 18. The coolant should be turned off when the model surface is at the highest temperature
- 19. Not too much spray release agent
- 20. After a certain amount of die-casting, stress relief and tempering
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