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Investment casting

What is investment casting?


Investment casting is one of the oldest manufacturing processes, dating back thousands of years, in which molten metal is poured into an expendable ceramic mold. The mold is formed by using a wax pattern - a disposable piece in the shape of the desired part. The pattern is surrounded, or "invested", into ceramic slurry that hardens into the mold. Investment casting is often referred to as "lost-wax casting" because the wax pattern is melted out of the mold after it has been formed. Lox-wax processes are one-to-one (one pattern creates one part), which increases production time and costs relative to other casting processes. However, since the mold is destroyed during the process, parts with complex geometries and intricate details can be created. 
 

Investment casting processing steps as follow :


1,Make the pattern  - The wax patterns is injected into a metal mold then formed as one piece. Several of these patterns are attached to a central wax gating system, Called wax pattern tree , Then dipped

2,Pouring - molten metal is poured from gating system of the mold, filling the mold cavity.

3,Cooling - The casting cooling time depends on the the structure of the parts and the different material .

4,Remove casting shell – the shell should be broken and the casting removed..

5,Finishing - grinding or sandblasting 


 

Investment casting materials


Most commonly using for investment casting is bronze ,magnesium ,stainless steel, steel. 

 
Investment casting vs die casting
 

Investment casting Advantages:

It can casting complicate structure parts
High strength performance parts
Better surface finish and precision

Investment casting Disadvantages:

Time-consuming
High labor cost
Long lead time

Die casting advantages:

Good surface  
Precision
High production
Low labor cost
 

Die casting Disadvantages:

Clean and trimming is necessary
High die cost

 
The casting, machining and finishing specialists
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