Lost wax casting description:
Lost wax casting divides Cryogenic lost wax casting and mesothermal lost wax casting.Cryogenic lost wax process as water glass casting , Dimension tolerance we could reach is ISO 8062 CT7-8.The main material is Carbon steel, Alloy steel; Dutile Iron, Hight Cr Cast Iron, Gray Iron, Resistance cast iron, The weight controled is about 0.3-100kg.
Mesothermal lost wax process as silica sol casting. The surface texture is better, dimension tolerance we could reach is ISO 8062 CT 5-6. The main material is Stainless steel, High Mn steel,Carbon steel, Alloy steel. The weight controled is 0.2-80kg.
1.Mould designing
Strictly making 3D model based on customer’s drawing dimensions, and mastered the contractibility rate for all types of material. Mould dimension will be zoomed with same proportion as per different 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
Once the ceramic is dry, the wax is melted out, creating a negative impression of the assembly within the shell.
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. Spectrograph testing
9.CONVENTIONAL CASTING
In the conventional process, the shell is filled with molten metal by gravity pouring. As the metal cools, the parts and gates, sprue and pouring cup become one solid casting. KNOCKOUT
When the metal has cooled and solidified, the ceramic shell is broken off by vibration or knock-out machine.
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. Stainless steel generally need solution treatment.
12.Polishing:
Polishing is to modify the out of flatness on casting head after casting cuttig and to modify the burring and splashings in the process of casting cycle.
13.Shot blasting treatment:
This process can make the products surface color to be the same and remove the polishing trace. In use of different dimensional steel ball could have different vision on the product surface.
14.Inspection:
Inspection of the mechanical properties, surface, internal quality, and to check if the rough dimension meet the drawing requirement for the prodcuts.
15. Machining
After approval of the semifinished products, we need to do machining as per the products requirement and choose different machining lathe based on the drawing requirement. Now we have CNC, Lathe, milling machine, drilling machine, boring lathe and grinding machine.
16. Inspection:
Quality inspection on the machining dimension. Mainly tools we use is like specialized gauge and callipers, mircocalliper, inner dimensional scale, height gauge, three-dimensional and visual inspection and so on.
17. Storage and Delivery

Emphasis on quality control:
1.The make of technology research recording card:
We can assure there will be no any holes, blister, crack, shrinkage cavity and so on based on technology. We will do some records about the easy-making mistake during the products development and note the correct operation methods.
2.Wax Mould sampling and Dimension inspection:
This process is to avoid changing of wax pattern contractibility rate results from the temperature change in the wax-pattern workshop, and finally result in products dimension disqualification. The rectification measure includes: Adjusts the temperature at the wax injection workshop and the water temperature used in Wax pattern cooling; testing tools; Callipers; Microcalliper；inner diameter gauge and Hight gauge.
3.Molten steel temperature control:
Investment casting differs from sand casting, Casting temperature need to be controlled perfectly, low temperature will result in incomplete products casting and have lack of body on the products；Excessive High-temperature will results in crack on the products.  We install temperature inductor by the furnace and ask workers do temperature recording when casting, for the aim of better control the temperature.
4.Molten steel chemical composition control:
our company owns advanced Spectrograph imported from Germany to assure that the products chemical composition conformed with specified standards. We will also test the molten steel composition before products casting, simultaneously, molten steel after casting will be sampled for Spectrograph testing, guide sample after casting will be kept for 2 years and also can keep as per customer’s requirement.
5. Products heat treatment control:
Correct heat treatment process is the only way to assure the products mechanical properties. We will design the heat treatment technology as per the products chemical composition and mechanical properties standards and provide the heat treatment process reports and temperature recording reports according to customer’s requirements. Also we can provide customer products testing bar in the same heat treatment furnace for customer inspection.
6.Products surface quality and dimensional inspection:
We have passed ISO:9000 certificate, and own special quality inspection department. With different products, quality inspection department will design different fixture and gauge. We will do 100% inspection upon the products for quarantee unqualified products scrapped in our company.