China Railway preparing steel base casting, China Railway anchorage casting.

Silica Sol Casting

Silica sol casting is also called Mesothermal lost wax process. The surface texture of Silica sol casting is better.And the dimension tolerance of Silica sol casting we could reach is ISO 8062 CT 5-6. The main material of Silica sol casting is Stainless steel, High Mn steel,Carbon steel, Alloy steel. The weight of Silica sol casting controled is 0.2-80kg.

Silica Sol Casting Process

1. Mould Designing
Strictly making 3D model based on customer’s drawing dimensions, and mastered the contractibility rate for all types of material.

2. Wax Injection
Wax design of the desired castings are produced by injection molding. These designs are called patterns.

3. Assembly
The patterns are attached to a central wax stick, called a sprue, to form a casting cluster or assembly.

4. Shell Building

The shell is built by immersing the assembly in a liquid ceramic slurry and then into a bed of extremely fine sand. Up to eight layers may be applied in this manner.

5. Dewax
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

6. Mould Shell Roast

This process is to put the lost-wax shell into the roast furnace and make them harder. Heating the Mould shell before casting is also to ensure the better products surface texture.

7. Smelting the Liquid Steel:

Allocate the chemical composition and sampling before steel casting.

8.Spectrochemistry Analysis
Inspection on materials by spectrometer testing.

9. Conventional Casting
In the conventional process, the shell is filled with molten metal by gravity pouring.

10. Cut Off
The parts are cut away from the central sprue using a high speed friction saw.

11.Heat Treating

Carbon steel and low-alloy steel need normalizing and temper, oil-quenching, water-quenching and so on. We can set out different heat treatment method as per different requirement from customers.

12. Polishing

Polishing is to modify the out of flatness on casting head after casting cuttig and to modify the burring and splashing in the process of casting cycle.

13. Inspection

Inspection of the mechanical properties, surface, internal quality, and to check if the rough dimension meet the drawing requirement for the prodcuts.

14. Machining

Cut the piece of raw material into a desired final shape and size. Now we have CNC, Lathe, milling machine, drilling machine, boring lathe and grinding machine.

15.Quality Inspection

Quality inspection on the machining dimension. Mainly tools we use is like specialized gauge and callipers, mircocalliper,three-dimensional and so on.

16. Storage and Delivery

Efficiency of package goods delivery on time per your shipping requests.

Advantage of silica sol casting

Wide Application Scope
Our silica sol casting process is virtually unrestricted by the size ,thickness and shape complexity.
Wide Choice of Alloys
Our silica sol casting process able to utilize a wide variety of alloys for common carbon steel, alloy steel, manganese steel,stainless steel ,and high-Cr & wear-resist Iron and so on.
Dimensional accuracy
The silica sol casting process is capable of producing foundry with higher accuracy than ordinary forgings and weld assembly in general condition.
Reduction of Production Costs
silica sol castings are able to reduce costs in many cases such as reduced machining, less materiel waste and so on.

In addition, we own CNC machining center and CNC Lathe, so machine parts (machining parts or machinery parts),metalwork (metal products) are ok for us!