What is Precision Casting?

What is Precision Casting? 

Precision casting is a lost wax casting process.It is also called investment casting which is widely used for producing ferrous and nonferrous metal casting.The lost wax method of Precision casting is suitable for producing castings with complex shapes and high dimensional accuracy.Precision casting has excellent surface finish and dimensional accuracy.Its product has net shape or near net shape.And it can be suitable for low quantity request order.Additionally,in both design and material choice of castings,Precision castings has a huge freedom.It allows many types of steel or alloy steel for investment.So on casting market, Precision casting is the highest quality castings .

We are a China precision casting foundry located in Ningbo. With precision casting process, we can cast nearly 300 alloys. Our metals include stainless steel, tool steel, carbon steel and ductile iron,aluminum, copper, brass,and other alloy steels. Precision casting is suitable for complex and detailed part designs,such as impeller. Because it use lost wax ceramic shells.Its patterns was injection molded in advance. After pouring,it can be finished.If more perfect request, it can be made by machining and post treatment.

Precision casting also faces a cost of molding and time.For each casting producing, it requires a mold and one wax pattern. It will take more time and separated cost.So it is not good economic for low quantity products.

Precision casting has many process steps, so it will take more time for each casting. Next, it is the Precision casting process introduction.

Precision Casting Process:

Step 1. MOLD DESING

As per the drawing, our engineer will finish mold design.The mold is purchased from mold factory.

Step 2. WAX INJECTION

The wax is be injected by machine. Wax design of the desired castings are produced by injection molding. These process is called patterns.

Step 3 . ASSEMBLY TREE

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

Step 4. SHELL MAKING

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

Step 5. DEWAXING

Once the ceramic is dry,then heating. The wax will be melted out. The melted wax will be flow out from the shell.

Step 6. 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 solid casting.

Step 7. KNOCKOUT

When the metal has cooled and solidified, the ceramic shell will be broken off by vibration or knock-out machine.

Step 8. CUT OFF

The parts are cut away from the central spruce using a high speed friction saw.

Step 9. GRINDING

After the casting was cut off.The casting pouring part will be grind ed carefully.

Step 10.Inspection and Post Treatment.

The casting will be inspected by inspector as per drawing and quality request.If there is unqualified parts. It will be repaired and inspected again.

Step 11. FINISHED CASTINGS

After surface finishing operations, the metal castings becomes identical to the original wax patterns and are ready for shipment to the customer.