What should be paid attention to during the use of aluminum alloy die castings? It is understood that there are five key points in the use of aluminum alloy die-casting molds: cleaning of mold parting surfaces, "mold inspection table", use of mold cooling system, preheating of molds before production, signal control, etc.
1. Use of mold cooling system
When the mold cooling water is used correctly, it not only prolongs the service life of the mold, but also improves the production efficiency. In actual production, we often neglect its importance. The operators also try to save trouble. If it is too troublesome to connect and connect, they will not connect the cooling water pipe. Some companies even customize the mold in order to save costs. Not even cooling the water, which caused very serious consequences.
The material of the mold is generally special mold steel, which is produced through various treatments. No matter how good the mold steel is, there are limits to their use, such as temperature. When the mold is in use, if the mold temperature is too high, it is easy to cause tortoise cracks on the surface of the mold core early. In some molds, tortoise cracks will appear on a large scale even if the mold has not exceeded 2000 times. Even when the mold is in production, because the mold temperature is too high, the mold core has changed its color. After measurement, it even reaches more than 400 degrees. When such a temperature is quenched by the mold release agent, it is easy to appear tortoise cracks. The products are also prone to deformation, strain, and mold sticking.
2. Cleaning the parting surface of the mold
This point is very troublesome and easy to overlook. If the boss has a high starting point and buys a good mold, then the work will be much easier; if the quality of the mold is not good, there will inevitably be a problem on the parting surface of the mold during production. If edges or dirt are generated, the operator should often clean these parts and be equipped with a small spatula at any time. If the flash is not removed in time, the parting surface of the mold is easy to collapse, causing aluminum to run out during the production process. Once this result is caused, no matter how good a mold repair expert you are, the possibility of a complete repair is very small. Yes, it's not that they don't have the skills.
The consequences of running aluminum will not only increase the cost of die casting, waste aluminum, and product quality is also unstable, especially the internal quality, but also increase the difficulty of determining process parameters, and the pass rate will drop a lot. From safety considerations, Increased the chance of a work injury.
During the handover, the operator should thoroughly clean the parting surface of the mold with kerosene, which can not only prevent the mold from being crushed, but also after cleaning, it can drain the mold from the mold release agent residue or other dirt. The opening of the gas groove is conducive to the discharge of gas in the cavity during the injection process, and the product quality is improved. When a team comes down, it is advisable to clean the parting surface twice. Let employees develop a good habit.
3. When each team takes over, check carefully according to the "Mold Check List" of our company, and solve the problems in time to avoid unnecessary troubles to themselves.
4. The mold must be preheated in the process of starting production to prevent the occurrence of turtle cracks when the cold mold suddenly encounters hot molten metal. The more complex mold can use blowtorch and liquefied gas, and the conditions are good. With a mold temperature machine, relatively simple molds can be preheated by slow injection.
5. If the mold is equipped with neutron control, please note that it is absolutely forbidden to connect the signal line between the die-casting machine and the mold. The reason is very clear. In daily production, it is difficult to avoid water on the signal line or bandage of the connector. It is easy to break the place, which will cause short connection with the machine tool. If the signal is wrong, it will alarm and automatically stop, which will delay the time; if the signal is disordered, the mold will be damaged and unnecessary losses will be caused. Pay attention to waterproof of the travel switch.
In the case of using mold cooling water, the use of mold release agent can be greatly reduced, so that operators will not use mold release agent to lower the temperature of the mold. The advantage is that it can effectively extend the life of the mold, save the die casting cycle, and improve the product. Quality, reduce the occurrence of mold sticking, strain and aluminum sticking; reduce the use of mold release agents, and also reduce the loss of ejector rods and cores caused by overheating of the mold.
