Silica sol project is the molding process which uses silica sol ( silica solution ) as the binder materials to build the cast cast. The alloy castings produced by silica sol casting have finely surfaces and high accuracy and the general dimensional tolerance grade is up to CT4 – CT6. And this work is the main investment casting march of RMC for stainless steel steel castings and debase steel castings. We have been developing new technology of adhesive material substantial to achieve much more economical and effective adhesive material material for investment cast industry .

Casting Capabilities for at RMC Foundry
Casting Process

annual Capacity / Tons independent Materials Casting Weight dimensional Tolerance Grade ( ISO 8062 ) Heat Treatment
green Sand cast 6000 Gray Cast Iron, Ductile Cast Iron, Cast Al, Brass, Cast Steel, Stainless Steel 0.3 kilogram to 200 kg CT11~CT14 standardization, Quenching, Tempering, Annealing, Carburization
Resin Coated Sand Casting ( Shell Casting ) 0.66 pound to 440 lbs CT8~CT12
Lost Wax Investment hurl Water Glass Casting 3000 Stainless Steel, Carbon Steel, Alloy Steel, Brass, Aluminium, Duplex Stainless Steel, Cast Iron 0.1 kilogram to 50 kg CT5~CT9
0.22 pound to 110 lbs
Silica Sol Casting 1000 0.05 kilogram to 50 kg CT4~CT6
0.11 pound to 110 lbs
Lost Foam Casting 4000

Gray Iron, Ductile Iron, Alloy, Carbon Steel, Stainless Steel, Brass, Al 10 kilogram to 300 kg CT8~CT12
22 pound to 660 lbs
Vacuum Casting 3000 Gray Iron, Ductile Iron, Alloy Steel, Carbon Steel, Stainless Steel 10 kilogram to 300 kg CT8~CT12
22 pound to 660 lbs
high pressure Die Casting 500 Aluminium Alloys, Zinc Alloys 0.1 kilogram to 50 kg CT4~CT7
0.22 pound to 110 lbs

It is a overwhelm swerve that silica sol casting serve replaces the rough inferior water methamphetamine serve in hale preciseness casting industry, particularly for stainless steel draw and admixture steel casting. Besides the introduce determine material, the silica sol casting action has besides being innovated to a lot steadier and less heat expanding .
investment ( lost wax ) molding is a method of preciseness casting which produces complex near-net-shape details using rejoinder of wax patterns. investment cast or lost wax is a alloy shape process that typically uses a wax form surrounded by a ceramic shell to make a ceramic mildew. When the husk dries, the wax is melted away, leaving merely the cast. then the casting component is formed by pouring melt metallic element into the ceramic shape .
According to the different binders for shell construction, the investment shed could be divided into silica sol binder investment casting, water glass binder investment cast and the investment casting with their mixtures as binder materials. Silica sol is a typical water-based binder with a silicic acerb colloid structure. It is a polymer colloidal solution in which highly dispersed silica particles are soluble in body of water. The colloidal particles are ball-shaped and have a diameter of 6-100nm. The process of investing roll to make the plate is the process of gelling. There are many factors influencing gelation, chiefly electrolyte, ph, sol concentration and temperature. There are many types of commercial silica sols, and the most use is alkaline silica sol with a silica content of 30 %. In club to overcome the shortcomings of the long shell-making cycle of the silica sol shell, a quick-drying silica sol has been developed in late years. The process of making silica sol plate is relatively simple. Each process has three processes : coating, sandpaper, and drying. Each work is repeated many times to obtain a multilayer shell of the command thickness .
In the silica sol beat making process, dry is the most critical action. Through dry, the water is volatilized, the silica sol gels, and the refractory particles are securely bonded together, thereby obtaining a high-strength blast. This is a good formulation for the subsequent cast .
The cast obtained by the silica sol carapace making action has moo surface crudeness, high dimensional accuracy and long blast making cycle. This process is widely used in casting high-temperature heat-resistant alloys, heat-resistant steels, stainless steels, carbon steels, abject alloys, aluminum alloys and copper alloys .
The silica sol preciseness lost wax investment frame process is suitable for repeatable production of net condition casting components from a variety show of different metals and high performance alloys. Although by and large used for modest castings, this process has been used to produce complete aircraft doorway frames, with steel castings of up to 500 kgs and aluminum castings of up to 50 kilogram. Compared to other casting processes such as die frame or backbone cast, it can be an expensive process. however, the components that can be produced using investment cast can incorporate intricate contours, and in most cases the components are cast near net income shape, thus ask little or no rework once cast .
▶ Ferrous and Non-ferrous Materials for Investment Casting:
Gray Iron : HT150, HT200, HT250, HT300, HT350 ; GJL-100, GJL-150, GJL-200, GJL-250, GJL-300, GJL-350 ; GG10~GG40.
Ductile Iron or Nodular Iron : GGG40, GGG50, GGG60, GGG70, GGG80 ; GJS-400-18, GJS-40-15, GJS-450-10, GJS-500-7, GJS-600-3, GJS-700-2, GJS-800-2 ; QT400-18, QT450-10, QT500-7, QT600-3, QT700-2, QT800-2 ;
Carbon Steel : AISI 1020 – AISI 1060, C30, C40, C45.
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, 1.4401, 1.4301, 1.4305, 1.4307, 1.4404, 1.4571 and early stainless steel grade.
Brass, Red Copper, Bronze or other Copper-based alloy metals : ZCuZn39Pb3, ZCuZn39Pb2, ZCuZn38Mn2Pb2, ZCuZn40Pb2, ZCuZn16Si4
• 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 millimeter × 800 millimeter × 500 millimeter
• Weight Range : 0.5 kg – 100 kilogram
• 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
▶ Inspecting Lost Wax Castings
• Spectrographic and manual quantitative analysis
• Metallographic analysis
• Brinell, Rockwell and Vickers hardness inspection
• Mechanical property analysis
• Low and normal temperature shock testing
• Cleanliness inspection
• UT, MT and RT inspection

▶ Post-Casting Process
• Deburring & Cleaning
• Shot Blasting / Sand Peening
• Heat Treatment : standardization, Quench, Tempering, Carburization, Nitriding
• Surface Treatment : Passivation, Anodizing, Electroplating, Hot Zinc Plating, Zinc Plating, Nickel Plating, Polishing, Electro-Polishing, Painting, GeoMet, Zintec.
• machine : turn, Milling, Lathing, Drilling, Honing, Grinding .
▶ Advantages of Investment Casting Components:
• Excellent and smooth surface finish
• Tight dimensional tolerances.
• Complex and intricate shapes with design flexibility
• Capability to cast flimsy walls therefore a light casting part
• Wide choice of draw metals and alloys ( ferric and non-ferrous )
• Draft is not required in the molds design.
• Reduce the indigence for secondary machine.
• Low material lay waste to .
▶ Why You Choose RMC for Custom Lost Wax Casting Parts?
• Full solution from one single supplier ranging customize convention design to finished castings and junior-grade process including CNC machine, heat treatment and surface treatment.
• Costdown proposals from our professional engineers based on your singular prerequisite.
• Short leadtime for prototype, test frame and any possible technical improvement.
• Bonded Materials : Silica Col, Water Glass and their mixtures.
• Manufacturing flexibility for small orders to mass orders.
• Strong outsourcing manufacture capabilities .

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