Key points of aluminum bronze semi – continuous casting process

Aluminum bronze has the casting properties of strong suction, easy oxidation slag, large solidification shrinkage, poor thermal conductivity, and poor casting performance. Before casting, tin bronze manufacturers used a mixture of some alkali earth metal compounds, such as Na₃AlF₆ and NaF, as a slagging agent to purify liquid copper. It was effective to improve the crystalline structure of pure liquid metal and ingot.

The casting temperature of aluminum bronze is generally 1120~1180℃, and the casting temperature of large size ingot is generally slightly lower. When aluminum bronze round ingot is cast, the metal liquid level in the mold can be cast in an open flow mode without any protection.

The melt enters the mold through a hole at the bottom of the funnel. The design of funnel aperture should meet two conditions at the same time: one is to ensure the flow rate matching the casting speed; Second, ensure that the funnel always maintains a certain level of liquid, so that the liquid surface scum can not flow into the mold from the funnel hole. Aluminum-bronze ingot is prone to porosity and concentrated shrinkage. It is necessary to carefully fill at the end of pouring to avoid concentrated shrinkage of ingot.

Aluminum-bronze wire with bending may have some tension instability and fluctuation. If there are some reflective highlights on the surface, the surface of copper wire has been damaged, which may be caused in the process of wire drawing, indicating that the quality of copper wire is not good. If the copper wire produced has this situation, we should pay attention to check whether our mold has been worn, and whether the guide wheel is not flexible for a long time, which may lead to flash problems.

If there are some missing marks on the surface of aluminum bronze wire, the visual finish is very poor. This phenomenon is called hair, which is also caused by wear and tear, and there are some scrapes and other problems, which indicate that the quality of copper wire is not very good. From the appearance can be roughly observed the quality of copper wire, so we must open our eyes when buying copper wire, not to be confused by inferior products.


Post time: Nov-10-2022
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