After nearly half a century of development, lost foam casting technology has gradually entered a mature stage. Its products have developed from simple castings to very complex castings, and there are more and more kinds of materials.
ZHY casting produces stainless steel valve castings, while using lost foam casting process instead of investment casting process has many advantages: first, lost foam casting can meet the requirements of mass production; Secondly, the cost of lost foam casting is lower than that of investment casting, which improves the added value of castings; Thirdly, the stainless steel valve castings produced by lost foam casting can meet the use requirements in terms of appearance quality and internal quality; The valve market is large, the demand is large, and there is a lot of living space.
The casting structure of stainless steel valve body is shown in the figure. Its specifications include DN65, DN80 and DN100. The casting material is 304 and the casting mass is 8, 10 and 12 kg respectively. Surface roughness requirements of castings Ra12 5~ 25 μ m. The dimensional tolerance level is 8 ~ 10, and the casting quality tolerance is 7 ~ 8. Although the structure of the lost foam casting is simple, the wall thickness difference is large and the surface quality requirements are high, and the hydrostatic test and air tightness test must be carried out. At the same time, the lost foam casting is not processed in all places to realize no cutting production.