In the production of stainless steel castings, some problems will be encountered more or less, resulting in casting defects. How much do you know about these defects and solutions? Then let me explain to you in detail.
1. The hammer is stuck
Solution: In production, often measure the temperature to avoid excessive temperature of the hammer head and barrel; use alloy materials that do not contain impurities to prevent impurities from sticking to the hammer head.
Second, the injection head is stuck in the gooseneck
Solution: When the equipment is at normal temperature, try to turn the hammer head. If it cannot be turned, change the cylinder and take out the hammer head. If you want to quickly solve the stuck problem, the best is the refueling pot.
3. Do not play dozens of mold materials during the beating process, and wait a few minutes before you can continue beating
Solution: See if there is a bright spot on the top of the material head. If it is all gray, it shows that the nozzle is blocked. The temperature of the nozzle can be adjusted up moderately. The time to leave the nozzle can be adjusted down by 0.1 to 0.2 seconds. The cooling water of the fixed mold is slightly Turn off.
4. It is easy to crack when casting thin-walled products
Solution: If this problem occurs, it may be that there is a problem with the material or the mold is not set well or the process parameters are not properly selected. Try to control the proportion of scrap not to exceed 30%. The mold retention time should not be too long. The wall thickness is about 3s per mm. The time can not be long, generally 0.5-2s.
5. The material is too hard, and the tool is easy to wear
Solution: Use the original material ratio, no recycled materials, and use the gemstone blade specially produced for cemented carbide.
Sixth, aluminum die castings have black spots when polished
Solution: Reduce the concentration of the spraying agent and use another spraying agent; or increase the blowing time after spraying.
7. Metal splashing 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 support plates to the moving mold to increase the rigidity of the cover plate.
8. Patterns are produced after die-casting of anodized parts
Solution: uneven spraying and injection oil walking, improper high-speed switching position or excessive copper ion content in the oxidation tank will cause pattern problems, so the spraying and injection oil can be evenly distributed, not gathered locally, or set up for high-speed switching Position, reduce the phenomenon of under casting.
Nine, die sticky material of stainless steel castings
Solution: Check whether the mold temperature is normal, moderately lower the casting temperature of the alloy liquid and the mold temperature; check whether the ratio of the mold release agent is abnormal, try to replace the mold release agent, debug the surface of the spraying position to polish, and carefully mold the nitrided mold Polishing to prevent the destruction of the surface nitride layer and the formation of more and more sticky conditions; improve the design structure of the casting system to avoid the alloy liquid continuously washing the cavity wall or core; modify the mold cooling system; adjust the die-casting process parameters and appropriately reduce the pressure Shooting speed, shorten the two-speed travel.