Common problems in die casting mold production

The industrialization process of modern society is developing faster and faster. In our country, motorcycles, automobiles, home appliances and other industries are developing very rapidly, and the appearance of products in these industries is also increasing. In addition to appearances that must keep up with product performance, aesthetics gradually occupy a large market.
The appearance of these industrial products is inseparable from molds. With the development of industry, the competitive factors in the industrial market have become more and more fierce. Mold manufacturers must produce molds with the fastest speed, the lowest cost, and the highest quality. In the die casting process of mold production, there are always some production technical problems. To sum up, it mainly appears in the following two aspects:
1. Why do aluminum die castings have black spots when they are polished?
There are several reasons for this situation. It may be silica or the formation of alumina. The solution is simple: use fresh aluminum ingots. But the biggest possibility is from the release agent. It may be that we sprayed too much release agent. It is also possible that the organic content of the release agent is too high. Some of these organic substances are reduced to carbon at the temperature of hot-melting aluminum, and some become organic macromolecular polymers. The mixture of these carbon molecules and polymers is contained in the surface layer when the aluminum casting is formed, and becomes the black spot we see. We can reduce the concentration of spraying agent, switch to another spraying agent, or increase the blowing time after spraying. To reduce the formation of carbon elements and prevent the accumulation of macromolecular polymers.
2. Why can’t the machining allowance in the aluminum die-casting hole exceed 0.25mm?
In order to make die casting more perfect, humans have added a lot of silicon (SI) to the aluminum alloy used for die casting. When the aluminum alloy condenses in the mold, the silicon will float on the surface, forming a thin silicon film. This silicon film is very hard and very wear-resistant. Some OEM designers use this feature. The inner surface of the die-casting hole is directly counted as the bearing surface. This silicon surface layer is generally only 0.2 to 0.9mm. Too much processing will shorten the life of this bearing surface.
In the die-casting process of mold production, we must be careful, so that every detail does not go wrong in order to create a beautiful mold. Only with the use of advanced management methods and integrated manufacturing technology, mold manufacturers can remain invincible in the fierce market competition.