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Die casting
| Problems and solutions during die casting |
| News category： Die casting Pageviews：610 |
Die casting, which is the most widely used of various casting processes, is characterized by the use of a mold cavity to apply high pressure to the molten metal. Compared to other metal casting techniques, die-cast surfaces are flatter, more uniform in size, and less expensive. In the die casting process, there are some common problems that affect the normal use of the machine and the accuracy of the casting. 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 die casting production process and their solutions:
The first question: the hammer is stuck
Solution: 1 In production, the temperature is often measured to avoid excessive temperature of the hammer head and the cylinder; 2 use high-quality alloy materials without impurities to prevent impurities from sticking to the hammer.
The second question: the injection head is stuck in the gooseneck
Solution: Wait for the equipment to be at room temperature, try to turn the hammer. If it cannot be turned, change the cylinder and take out the hammer. If you want to quickly solve the problem of stuck, the best is to change the pot.
The third problem: you can't hit dozens of mold materials when you are hitting. You have to wait a few minutes before you can continue to feed.
Solution: Look at the top of the material to see if there is a bright spot. If it is all gray, it means that the nozzle is blocked. The temperature of the nozzle can be adjusted moderately. The time from the nozzle is lowered by 0.1 to 0.2 seconds. The cooling water of the fixed mold is slightly. Close the small point.
Fourth problem: easy to crack when die-casting thin-walled products
Solution: This problem may occur if there is a problem with the material or the mold is not set up properly or the process parameters are not properly selected. The proportion of waste should not be controlled as much as 30%. The mold retention time should not be too long. The thickness of each mm is about 3s. It can't be long, usually 0.5-2s.
The fifth problem: the material is hard and the tool is easy to wear.
Solution: With the original material ratio, without recycled materials, the gemstone blade is specially made for cemented carbide.
Sixth problem: aluminum die castings have dark spots when polished
Solution: Reduce the spray concentration, use another spray, or lengthen the spray time after spraying.
Seventh question: metal splashing during die casting
Solution: Re-install the mold; increase the clamping force, adjust the die-casting machine, keep the moving and fixed-mode mounting plates parallel to each other; add the supporting plates on the moving mold to increase the rigidity of the clamping plate.
The eighth question: the pattern is produced after the anodizing of the die casting
Solution: spraying, uneven injection of oil, high-speed switching position or excessive copper ion content in the oxidation tank will cause pattern problems, so the spray and injection oil can be evenly distributed, not gathered in the local, or set high-speed switching. Position to reduce under-casting.
The ninth question: die casting mold adhesive
Solution: Check whether the mold temperature is normal, moderately reduce the casting temperature of the alloy liquid and the mold temperature; check whether the ratio of the release agent is abnormal, try to replace the release agent, and debug the surface of the spray position for polishing. For the nitrided mold, be careful. Polishing to prevent damage to the nitride layer on the surface, forming a more viscous situation; 4. Improving the design of the casting system to avoid continuous scouring of the cavity wall or core; 5. Modifying the mold cooling system; 6. Adjusting the die casting Process parameters, appropriate reduction of injection speed, shorten the second speed stroke. |
