Stainless Steel Precision Investment Casting Manufacturer from China Foundry
Investment (lost wax) casting is a method of precision casting complex near-net-shape details using replication of wax patterns. Investment casting or lost wax is a metal forming process that typically uses a wax pattern surrounded by a ceramic shell to make a ceramic mold. When the shell dries, the wax is melted away, leaving only the mold. Then the casting component is formed by pouring molten metal into the ceramic mold.
The process is suitable for repeatable production of net shape components from a variety of different metals and high performance alloys. Although generally used for small castings, this process has been used to produce complete aircraft door frames, with steel castings of up to 500 kgs and aluminium castings of up to 50 kgs. Compared to other casting processes such as die casting or sand casting, it can be an expensive process. However, the components that can be produced using investment casting can incorporate intricate contours, and in most cases the components are cast near net shape, so require little or no rework once cast.
Silica sol casting process is the main steel investment casting process of RMC investment casting foundry. We have been developing new technology of adhesive material to achieve much more economical and effective adhesive material to build the slurry shell. It is a overwhelming trend that Silica sol casting process replaces the rough inferior water glass process, especially for stainless steel casting and alloy steel casting. Besides the innovated molding material, the silica sol casting process has also being innovated to much steadier and less heat expanding.
▶ Casting Tolerance Could Reached by Investment Casting:
According to the different binder materials used for making the shell, the investment casting could be divided into silica sol casting and water glass casting. The silica sol investment casting process have better Dimensional Casting Tolerances (DCT) and Geometrical Casting Tolerances (GCT) than water glass process. However, even by same casting process, the Tolerance Grade will be different from each cast alloy due to their various castability. Our foundry would like to talk with you if you have special request on the required tolerances. Here in the following are the general tolerances grade we could reach both by silica sol casting and water glass casting processes separately: ✔ DCT Grade by Silica Sol Lost Wax Casting: DCTG4 ~ DCTG6 ✔ DCT Grade by Water Glass Lost Wax Casting: DCTG5 ~ DCTG9 ✔ GCT Grade by Silica Sol Lost Wax Casting: GCTG3 ~ GCTG5 ✔ GCT Grade by Water Glass Lost Wax Casting: GCTG3 ~ GCTG5
▶ Ferrous and Non-ferrous Materials for Investment Casting, Lost Wax Casting Process:
• Carbon Steel: AISI 1020 - AISI 1060, • Steel Alloys: ZG20SiMn, ZG30SiMn, ZG30CrMo, ZG35CrMo, ZG35SiMn, ZG35CrMnSi, ZG40Mn, ZG40Cr, ZG42Cr, ZG42CrMo...etc on request. • Stainless Steel: AISI 304, AISI 304L, AISI 316, AISI 316L, 1.4404, 1.4301 and other stainless steel grade. • Brass, Red Copper, Bronze or other Copper-based metals • Other Materials as per your unique requirements or according to ASTM, SAE, AISI, ACI, DIN, EN, ISO, and GB standards
▶ Capabilities of Investment Casting Foundry
• Max Size: 1,000 mm × 800 mm × 500 mm • Weight Range: 0.5 kg - 100 kg • Annual Capacity: 2,000 tons • Bond Materials for Shell Building: Silica Sol, Water Glass and their mixtures. • Tolerances: On Request.
▶ Main Production Procedure
• Patterns & Tooling Design → Metal Die Making → Wax Injection → Slurry Assembly → Shell Building → De-Waxing → Chemical Composition Analysis → Melting & Pouring → Cleaning, Grinding & Shot Blasting → Post Processing or Packing for Shipment
• Excellent and smooth surface finish • Tight dimensional tolerances. • Complex and intricate shapes with design flexibility • Capability to cast thin walls therefore a lighter casting component • Wide selection of cast metals and alloys (ferrous and non-ferrous) • Draft is not required in the molds design. • Reduce the need for secondary machining. • Low material waste.