Valve Investment Castings

Product Introduction

Investment Casting Production Process
Valve investment castings are valves made by casting. Generally, the pressure levels of cast valves are relatively low (such as PN16, PN25, PN40, but there are also high-pressure ones, which can reach 1500Lb, 2500Lb), and most of the diameters are above DN50.
1. Casting is a process in which metal is smelted into a liquid that meets certain requirements and poured into a mold. After cooling, solidification, and cleaning, a casting (part or blank) with predetermined shape, size, and performance is obtained. It is a modern mechanical process. Basic processes in the manufacturing industry.
2. The cost of blanks produced by casting is low, and it is more economical for parts with complex shapes, especially those with complex inner cavities; at the same time, it has wide adaptability and good comprehensive mechanical properties.
3. However, materials (such as metal, wood, fuel, modeling materials, etc.) and equipment (such as metallurgical furnaces, sand mixers, molding machines, core making machines, shakeout machines, shot blasting machines, cast iron flat plates, etc.) required for casting production ), and will produce dust, harmful gases and noise to pollute the environment.
4. There are many types of casting, which are customarily divided into: according to the modeling method:
① Ordinary sand casting, including green sand mold, dry sand mold and chemical hardened sand mold.
② Special casting, according to the molding materials, can be divided into two categories: special casting with natural mineral sand and gravel as the main molding material and special casting with metal as the main mold material.
5. The casting process usually includes:
① Preparation of casting molds (containers that turn liquid metal into solid castings). Casting molds can be divided into sand molds, metal molds, ceramic molds, clay molds, graphite molds, etc. according to the materials used. Casting molds can be divided into disposable types and semi-permanent types according to the number of uses. And permanent mold, the quality of mold preparation is the main factor affecting the quality of castings;
② Melting and pouring of cast metals. Cast metals (cast alloys) mainly include cast iron, cast steel and cast non-ferrous alloys;
③ Casting processing and inspection. Casting processing includes removing foreign matter on the surface of the core and castings, removing sprues and risers, shoveling burrs and seams and other protrusions, as well as heat treatment, shaping, anti-rust treatment and rough machining.
 

Detection Systems

Copper Silica Sol Investment Casting