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 Shandong. 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

What is Precision Casting 1

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

  Step 2. WAX INJECTION

What is Precision Casting 2

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

What is Precision Casting 3

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

  Step 4. SHELL MAKING

What is Precision Casting 4

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. DEWAX

What is Precision Casting 5

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

What is Precision Casting 6

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

What is Precision Casting 7

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

  Step 8. CUT OFF

What is Precision Casting 8

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

  Step 9. GRINDING

What is Precision Casting 9

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

  Step 10.Inspection and Post Treatment.

What is Precision Casting 10

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

What is Precision Casting 11

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

People like Precision casting,what advantages does it have?Why people choose Precision casting?

Perfect Surface Finish
  
The investment casting process provides far superior surface finish as compared to forgings and sand castings. Sometimes this is important and can avoid machining or other finishing operations.
 
Closer to finished part designs
  
 
Investment Castings provide near net shapes for manufactured parts, thus eliminating or reducing machining costs. Holes, undercuts, slots and other difficult detail that cannot be had with other processes can often be provided. An added benefit of near net shape is the savings on material, especially with expensive alloys such as nickel and cobalt alloys.
Tighter Tolerances
  
  
Due to the nature of the process, Investment Castings can be held to much tighter tolerances than sand castings or forgings.
Competitive Tooling Costs
  
Initial charges for the investment casting tooling are often less expensive than those for sand castings.
  
Thin wall castings
 
 
The investment casting process is capable of more reliable castings with much thinner walls than sand castings. Advantages include substantially less scrap rates and castings that weigh less due to the thinner wall capability.
Less casting defects
 
Being a cleaner process than sand molds, investment castings in general, provide a much higher percentage of defect free-castings.

For Precision Investment Casting Process Documents, you can download the precision investment casting process pdf as below:

China Precision Casting Foundry

  With 23 years history, we have make a range of high grade investment castings. Our foundry is your reliable supplier for your precision cast parts. Precision castings from our investment casting foundry will be the highest quality castings.

  Our business core is to provide quality precision castings with high working performance. Our lost wax casting process provides a large freedom in both design and material choice.Importantly, our engineering department will give you a complete casting proposal about product design, material choice, machining details, ect for your reference.