In die casting production, whether you are new to the industry or have been working in the industry for many years, you will always encounter several common problems in die casting. Let's take a look at the common problems in die casting production? See if you have encountered any of these problems. No, you are a senior master in this industry.
1. [Hammer head stuck]
To avoid sticking the hammer head, you can start from two aspects: 1. During production, often measure the temperature to avoid sticking the hammer head due to excessive temperature of the hammer head and the driver cylinder; 2. When using materials, high-quality alloy materials should be selected to avoid the infiltration of impurities. When putting back materials, attention should also be paid to not allowing impurities to mix in, so as to prevent impurities from adhering to the hammer head, causing the hammer head to jam.
2. [The injection head is stuck in the gooseneck]
When encountering the problem of stuck hammer heads, first wait until the equipment is at normal temperature and try to rotate the hammer heads. If it cannot rotate, replace the driver cylinder to solve the problem and take out the hammer head. If you want to quickly solve the stuck problem, the quickest way is to replace the material pot.
3. "When casting materials with a die casting machine, it often occurs that dozens of molds are struck and the material cannot be produced. It is often necessary to wait for a few minutes before casting materials."
Generally, in this case, the nozzle head or body should be blocked. At this time, observe whether there are no bright spots on the top of the blanking head. If the entire section is gray, it indicates that the nozzle is blocked. The solution is as follows: 1. Adjust the nozzle temperature adaptively higher; 2. Turn down the time when the nozzle is off by 0.1 to 0.2 seconds; 3. Turn down the cooling water for the fixed mold slightly.
4. [Thin wall products are prone to cracking during die casting]
Analysis can be made from the following points: 1. There may be problems with materials, and the use of die casting materials should be controlled to ensure that the proportion of waste materials does not exceed 30%; 2. The mold setting is not good, first, the ejection force is not balanced; The second reason is that the unreasonable opening of cooling water leads to uneven mold temperature, and the single reason is that the filling flow is unreasonable. 3. Improper selection of process parameters. The main problems with process parameters are errors in the retention time and ejection delay time. The retention time should not be long, with about 3s per mm of wall thickness; The ejection delay cannot be long, usually 0.5-2s.
5. [Feedback on the hard material and easy wear of tools during the die casting process of ADC14 material]
To solve this problem, it can be seen from the following points: 1. The most important thing is that impurities are not allowed to occur in the newly formed components, that is, hard spots. It is best to use new raw material proportions instead of recycled materials, especially the S1 element, which has a better quality; 2. Gem blades specially produced for these relatively hard alloys should be used, with a general service life of about 7 days.
6. "Why do some aluminum die castings have black spots when polished?"
There are several reasons for this: it may be silicon oxide or aluminum oxide ingots that solve the problem. However, the greatest possibility is that the release agent is sprayed too much or the organic content of the release agent is too high. At the temperature of hot melt aluminum, some of these organic compounds are reduced to carbon elements, and some become organic macromolecular polymers. When carbon molecules and polymers are mixed and formed in aluminum castings, they are included in the surface layer and become the black spots we see. Therefore, reduce the concentration of spraying agent and switch to other spraying agents; Or lengthen the blowing time after spraying.
7. "During the die casting process, sometimes there is metal splashing outside."
Why does metal splash sometimes occur? There may be several reasons: the clamping between the moving and fixed molds is not tight, and the gap between the two is large; Or insufficient mold locking force causes metal splashing; Or due to the non parallel installation of die casting machines and fixed molds; Or the support plate has a large span, and the pressure injection force causes deformation of the cover plate, resulting in spraying. When encountering the above reasons, the external splash can be solved through the following debugging: reinstall the mold; Increase mold locking 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 plate.
8. "Why can't the hole machining of aluminum die casting exceed 0.25 mm?"
In order to be suitable for die casting, a lot of silicon is added to the aluminum alloy used for die casting. When aluminum alloys condense in the mold, these silicon will float to the surface, forming a layer of silicon film that is very hard and wear-resistant. Some OEM designers use this feature to directly design the inner surface of the hole of the die casting as a bearing surface. This silicon surface layer is typically only 0.2 to 0.9 mm thick. "If too much machining is done, the life of this bearing surface will be shortened.".
9. [What are the reasons for the pattern formation of die castings after anodizing?]
1. At present, the main problem is that the spray and pressure jet oils are unevenly dispersed and partially aggregated, resulting in abnormal aluminum alloy composition or cold shut spots on the surface layer, leading to the appearance of oxidized patterns; The grain of the oxidation pattern is basically consistent with the grain on the die casting.
2. Due to improper high-speed switching position, undercasting occurs and there will be patterns after oxidation. 3. Textbooks say that excessive copper ion content in oxidation tanks also produces patterns, but this situation is rare.
10. 【 Die casting mold adhesive 】
What should I do if the die casting mold sticks? Firstly, check whether the mold temperature is normal, and appropriately reduce the pouring temperature of the alloy liquid and the mold temperature; 2. Check whether the mold release agent ratio is abnormal, try to replace the mold release agent, adjust the surface at the spraying position for polishing, and carefully polish the nitrided mold to prevent damage to the surface nitride layer, forming a situation where the more polishing, the more sticky; 4. Improve the design structure of the pouring system to avoid continuous erosion of the cavity wall or core by alloy liquid; 5. Modify the mold cooling system; 6. Adjust the die casting process parameters, appropriately reduce the injection speed, and shorten the two-speed stroke.
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