Valve body manufactured by stainless steel precision casting using lost wax process. Heat number tracing system is applied.

Quick Detail:

1. Stainless steel precision casting part of a valve component in chemical industry;
2. Material: stainless steel AISI 316L, UNS S31603, BSEN 1.4404, DIN X2CrNiMo17-2-2;
3. Weight: 0.79kg; Cast weight various from: 10g~80KG;
4. Size:110x30x40mm;
5. X ray inspection can be operated;
6. Heat number system applied for tracing back;

Description:

Stainless steel precision casting using ceramic shell process for parts in various industries such as Valves&pumps,Pipe fittings, Marine, oil &gas, medical, military, electronics, machinery. 

Winnington is capable of performing a wide range of materials such as duplex stainless steel, carbon steel, alloy steel, with different levels of complexity:

OVERVIEW OF LOST WAX CASTING PROCESS

Lost wax casting is regarded as a casting process to build near-net-shaped parts from almost any alloy. The most common use of lost wax casting has been the production preference of components requiring complex, especially thin-wall castings. Investment casting has for some time been perceived as a comparatively expensive process. But when compared to alternative processes which require extra welding or machining, an investment cast component can often dramatically reduce overall part production costs since it is made close to net shape.

The investment casting process begins with modeling of a sacrificial pattern with the basic geometrical shape as the finished cast part. Patterns are normally made of recyclable green wax that is injected into a metal wax injection die. Once a wax pattern is formed, it is assembled with other wax components to form a metal delivery system , called the gate and runner system. The entire wax assembly is then dipped in a ceramic slurry, covered with a sand stucco, and allowed to dry. The dipping and stuccoing process is repeated until a shell of ~6-8 mm is applied.

Once the ceramic has dried, the entire assembly is placed in a steam autoclave to remove most of the wax. After autoclaving, the remaining amount of wax that soaked into the ceramic shell is burned out in a furnace. At this point, all of the residual pattern and gating material is removed, and the ceramic mold remains. The mold is then preheated to a specific temperature and filled with molten metal, creating the metal casting. Once the casting has cooled sufficiently, the mold shell is chipped away from the casting. Next, the gates and runners are cut from the casting, and final postprocessing (shot blasting, machining, polishing) is done to finish the casting.

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