How to increase the service life of the slag pot

In the casting slag pot, in order to prevent the shrinkage hole in the hot joint part of the slag pot, the wall thickness is often artificially increased in the lower part of the riser, so as to achieve sequential solidification, and finally the shrinkage hole is transferred to the riser, which is called subsidy technology in technology. the method of setting metal subsidy is simple and direct, and can effectively eliminate the shrinkage cavity and slag inclusion defects that may be produced in the hot spot.

But the metal subsidy will also encounter problems, the patch is an artificial increase in size, in the slag pot cleaning, the patch is to be removed, on the one hand, the workload of removing the subsidy is large, and the second is that there will be a serious oxygen cut scar in the subsidized area. for the slag pot, the surface is not machined, which will affect the appearance. Therefore, for some non-important castings, casting defects are often allowed without subsidy, but for important structural castings, casting defects are not allowed, so for the structural parts in this situation, how to solve the inherent casting defects of the slag pot without affecting the appearance quality is a dilemma. In actual production, we can also set up cold iron in the hot joint parts, this method is very cumbersome. The quality is also unstable, the cold iron area is too small, to achieve the purpose of eliminating hot spot round shrinkage, the cold iron surface area is too large, it will hinder the feeding channel, resulting in the formation of shrinkage holes in the lower part of the hot joint circle, can not form sequential shrinkage. In recent years, a kind of heat subsidy technology has solved this problem well.

As we all know, the slag pot is consumable. Take the 20-ton slag pot, for example, after the adiabatic patching process, the average use times is about 300 times, and before the adiabatic patching is carried out, the average service life will not exceed 120 times, which shows that the hot patching process greatly improves the internal quality of the slag pot. Adiabatic patch instead of metal patch can not only improve the surface quality of castings, but also reduce the cleaning work of slag pot. Replacing the cold iron design with adiabatic patches can simplify the process design, improve the process reliability, and avoid casting defects such as pores and cracks in the cold iron process.