Casting process of valve casing

Abstract

The invention discloses a casting process of a valve casing. During smelting, stainless steel 1Cr13 foundry returns and low-carbon steel scraps are used as raw materials and smelted into casting molten steel in an intermediate frequency furnace; during casting, a resin sand two-bin modeling is adopted for a valve casing casting mould (1) to manufacture a core, during core manufacturing, an intermediate connection part of a mud core No.1 is connected by a ceramic pipe (4), chromite sand (5) with the thickness of 15mm is placed on a part that is easy to leak by pressure, two heat insulation dead heads (2) in specification of 80*120*120 are designed to be arranged on the valve casing casting mould (1), a shaped chiller (3) with the thickness of 20mm is designed to be arranged on a tail flange part and used for an upper bin and a lower bin by half respectively, vent holes of phi15 are pierced on the top of a flange, and a slag trap (6) with the height of 150mm is arranged on a connecting part between a transverse casting runner and an internal casting runner. The invention overcomes the casting defects of sanded vent holes, burning sand on surface, and the like, prevents the situation of leakage by pressure of the valve casing in a 69Bar pressure test due to more and complex mud cores, and meets the requirements of the valve casing on chemical composition and mechanical property.

Description

technical field [0001] The invention relates to a casting process, in particular to a casting process of a valve housing. Background technique [0002] As we all know, the valve casing is cast from molten steel, and the chemical composition and mechanical properties that the valve casing must meet are shown in Table 1 and Table 2: [0003] Table 1 Chemical composition (%) [0004] [0005] Table 2 Mechanical properties [0006] [0007] At present, the structure of the valve casing casted by the existing casting process is relatively complex, and there are many mud cores, and the valve casing has pressure leakage in the 69Bar pressure test. Contents of the invention [0008] The purpose of the present invention is to provide a casting process for valve casings, which overcomes casting defects such as sand pores and surface sticking sand, and avoids pressure leakage of valve casings in the 69Bar pressure test due to many and complicated mud cores , so that the valv...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a casting process for valve casings, which overcomes casting defects such as sand pores and surface sticking sand, and avoids pressure leakage of valve casings in the 69Bar pressure test due to many and complicated mud cores , so that the valve housing meets the requirements of chemical composition and mechanical properties

Images