Common Problems and Solutions about Stainless Steel Die Castings

Stainless steel die casting is one of the most widely used casting processes and is characterized by the use of a mold cavity to apply high pressure to molten metal.

Compared to other metal casting techniques, die casting has a flatter surface, more consistent dimensions, and lower cost. In the process of die casting, there are some common problems, which will affect the normal use of the machine and the accuracy of castings. So what are the problems and what are the solutions?

Let's take a look at it together: the nine most common problems in the production process of die casting and their solutions:

Problem 1: The hammer head is stuck

✔️Solution:

1. During production, the temperature is often measured to avoid excessive temperature of the hammer head and the barrel;
2. Select high-quality, impurity-free alloy materials to avoid impurities sticking to the hammer.

Problem 2: The injection head is stuck in the gooseneck

✔️Solution: When the equipment is at room temperature, try to turn the hammer head. If it cannot be rotated, replace the cylinder and take out the hammer head. If you want to solve the stuck problem quickly, the best thing is the refill pot.

Problem 3: When the material is punched, it cannot be punched by dozens of molds. It takes a few minutes before the punching can continue.

✔️Solution: Check if there are bright spots at the top of the cutting head. If the section is all gray, it means the nozzle is blocked. You can adjust the temperature of the nozzle moderately, and reduce the time of hitting the nozzle by 0.1 to 0.2 seconds. The cooling water of the fixed mold is slightly Turn it off.

Problem 4: It is easy to crack when die-casting thin-walled products

✔️Solution: When this problem occurs, it may be due to material problems or poor mold opening or improper selection of process parameters. Try to control the proportion of waste not to exceed 30%, and the mold retention time should not be too long. Time can not be long, generally 0.5-2s.

Problem 5: The material is hard and the tool is easy to wear

✔️Solution: Proportion of virgin materials, not recycled materials, using gemstone inserts specially produced for cemented carbide.

Problem 6: Aluminum die castings have black spots when they are polished

✔️Solution: Reduce the concentration of spraying agent and use another spraying agent; or lengthen the blowing time after spraying.

Problem 7: Metal splashes during die casting

✔️Solution: Reinstall the mold; increase the clamping force, adjust the die-casting machine to keep the moving and fixed mold mounting plates parallel to each other; add a support plate on the moving mold to increase the rigidity of the sleeve.

Problem 8: There are patterns after anodizing of die castings

✔️Solution: Uneven distribution of spraying and injection oil, improper high-speed switching position or excessive copper ion content in the oxidation tank will cause pattern problems. Therefore, spraying and injection oil can be spread evenly and not concentrated locally, or high-speed switching can be set. position to reduce under-casting.

Problem 9: Die-casting mold sticky material

✔️Solutions:

1. Check whether the mold temperature is normal, and moderately reduce the alloy liquid pouring temperature and mold temperature;
2. Check whether the ratio of the release agent is abnormal, try to replace the release agent, debug the surface of the spraying position for polishing, and carefully polish the nitrided mold to prevent the nitrided layer on the surface from being damaged, resulting in a situation where the more you throw it, the more sticky it is;
3. Improve the design structure of the gating system to avoid continuous erosion of the cavity wall or core by the alloy liquid;
4. Modify the mold cooling system;
5. Adjust the die-casting process parameters, appropriately reduce the injection speed, and shorten the second-speed stroke.

Conclusion

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