The riser sleeve is made of high silicon melting point 140 and Al Si. It has strong corrosion resistance, high geometric accuracy, smooth surface, long service life, low maintenance cost and no pollution to molten metal. It is the best choice for hot top casting, which can meet the technical requirements for the production of high value-added and high-tech aluminum alloy precision casting products (such as aviation, transportation and electronic products).
Hot top casting is a casting method in which there is a good heat preservation part on the top of the mold, which is used to slow down the initial cooling of the upper part of the mold, rather than slowing down the cooling rate of the first mold. Cooling of the whole mould. Riser sleeve is one of the important parts before molten aluminum enters the mold.
Select the corresponding specifications of hot top casting equipment platform installation accessories
Install the splitter plate, bushing, adapter plate, ceramic launder and graphite ring on the upper side of the platform.
The housing, adapter plate and graphite ring are installed inside the mold to ensure cleanliness, no damage and no gap.
It is best to seal the sides and bottom with ceramic fiber paper or ceramic fiber blanket to help keep warm.
After the complete hot top casting platform is installed, the installed standard equipment platform is uniformly preheated to 260-350 ° C. It can be baked with electricity or air. It is forbidden to contact the product lining with open fire, otherwise cracks will be damaged. Users promise to remove the adsorbed crystal water for safe and effective use.
Technological characteristics of hot top casting
1. Hot top casting is not only beneficial to improve the surface quality of ingot, but also to directional solidification and supplementary Shrinkage from bottom to top. If a filter plate is added to the hot top at the same time, molten slag can be prevented from entering the ingot.
2. During a period of time after the molten aluminum enters the copper mold, the melt in the hot top can still maintain a high temperature, which will cause the floating of precipitation gas during the solidification of the melt and the additional solidification shrinkage. Good conditions.