The pressure die casting process is a manufacturing technique that involves injecting molten metal into a specially designed mold under high pressure. This results in the creation of intricate, high-quality metal components with excellent surface finishes and dimensional accuracy.

Refining treatment of die-cast aluminum alloy metal liquid

The casting of aluminum alloy needs to be refined before pouring to purify the alloy liquid, but it has not received enough attention. The main reason for causing the neglect of die casting aluminum alloy refining treatment is the particularity of die casting production mode. Because the die casting alloy liquid is formed under high pressure and cold conditions, the stomatal defects caused by the wrapping air is the main. Therefore, the die-cast aluminum alloy is less sensitive to refining treatment than other casting methods. Because the air of the wrapping person accounts for the vast majority, for die casting, it is necessary to exclude the air in the mold cavity, such as opening the overflow groove on the mold.

Other factors also tend to ignore the necessity of die-casting aluminum alloy refining treatment, such as: The quality requirements of the die castings are not high; The factory is located in the regional climate is dry, aluminum ingot oxide is less; Large batch normal production, waste furnace proportion is small, the recovery rate is low, the quality of the new ingot is good; The melting capacity of the melting equipment does not match the production capacity of the die casting machine (that is, the melting supply);

Based on the production cost of die casting, the influence of traditional habit forces. With the higher and higher requirements for the internal and external quality of die castings, many castings have the requirements of air tightness and workability, therefore, the refining treatment of die casting aluminum alloy to improve the quality of die casting can not be ignored. In the alloy brand, product ingot quality, allowed impurity type and content, smelting (remelting) equipment and other processes except refining, the key to achieve high quality alloy liquid is to use the ideal, efficient "refining agent" refining, to maximize the removal in the gas and all kinds of inclusions, in order to achieve the purpose of purifying alloy liquid. The amount of hydrogen and inclusions applied in the aluminum alloy liquid depends on the refining agent and the refining method used in the refining treatment. If the refining agent used is chlorine gas and chloride, the "refining" mechanism is the planktonic method, and the chemical reaction formula is as follows:

There are also other refining methods, such as blowing an inert gas. To sum up, the purpose of refining treatment of die-cast aluminum alloy is mainly to sum the hydrogen in the alloy liquid, and reduce their content through chemical reaction, adsorption, filtration and other ways, so as to improve the quality of die-casting. However, because the sensitivity of die casting aluminum alloy to refining treatment is weaker than other casting aluminum alloy, and the process specifications are not observed, sometimes the effect of refining treatment is not very obvious.