The problem in the process of producing stainless steel fittings is that castings have shrinkage porosity. In order to deal with this problem, many experts have conducted research. Now Solid Casting has summarized the following points for dealing with the shrinkage porosity of stainless steel fittings:
1. Change the position of the runner in the casting;
2. Reasonable process planning. Inner sprue The inner sprue is located at the opposite wall of the casting, which is numerous and scattered. The molten metal that enters the thick wall first is condensed first, and then condenses at the thin wall, so that even the condensate is basically reached everywhere. For machine tool castings with uniform wall thickness, multiple internal runners and vent holes are selected. There are many inner runners, scattered and evenly distributed, so that the whole heat is balanced. The vent holes are thin and many, that is, the exhaust is smooth and the heat dissipation effect is improved;
3. In the thick and hot spots formed by the stainless steel fitting structure, implement rapid condensation to artificially form the fundamental balance of the temperature field throughout the casting. Use cold iron from the outside and the inside, and partly use zircon sand, chromite sand or special paint with large heat storage.