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Investment Casting


Investment Casting is an ancient and widely used metal casting process that revolves around the complex yet highly repeatable preparation of molds and models.


Investment Casting process:
Mold preparation:


Mold material selection: Choose suitable mold material based on the requirements of the casting. Commonly used materials include plaster, wax, and silicone.

Mold shell preparation: Pour the selected mold material into the mold shell and let it harden or solidify, forming a mold with a certain cavity structure.


Model production:

Model design: Precisely design the model based on the shape and size requirements of the casting.

Model production: Common methods include wax injection and mechanical machining to create models that meet the mold requirements.


Mold assembly:

Injection of mold release agent: Apply mold release agent to the mold surface to facilitate separation during demolding.

Mold assembly: Assemble the two halves of the mold together and ensure a good seal.



Heating: Heat the assembled mold to melt or burn out the model, resulting in a mold with a hollow cavity.

Demolding: After the mold cools, remove the mold shell, obtaining the metal hollow cavity mold.


Melting and pouring:

Metal melting: Melt the desired metal material to a liquid state and perform necessary treatments such as removing impurities.

Pouring: Pour the molten metal into the hollow cavity mold obtained after demolding, filling the entire cavity.


Cooling and demolding:

Cooling: Allow the metal to solidify, and properly cool the casting to ensure the formation of a solid structure.

Demolding: Remove the mold to obtain the final casting.


Trimming and surface treatment:

Trimming: Trim the casting by removing excess materials, cutting, and scraping to achieve the specified dimensions and shape.

Surface treatment: Perform processes such as sandblasting, polishing, and coating to enhance the surface quality and appearance of the casting.


Advantages of Investment Casting:

High precision: Investment Casting can produce complex castings with high dimensional accuracy and surface quality, suitable for products with high precision requirements.

Design freedom: Investment Casting allows for the production of various shapes and complex internal cavities, meeting different design needs.

Cost control: Compared to other high-precision casting processes, Investment Casting has relatively simple production processes and lower costs, giving it a competitive advantage in small-batch or small-to-medium-scale production.

Material versatility: Investment Casting can be performed using various types of metal materials, including aluminum alloys, nickel alloys, titanium alloys, etc., exhibiting versatility in material selection.


Disadvantages of Investment Casting:

Long production cycle: Investment Casting involves multiple processes such as mold preparation, model production, demolding, melting, etc., resulting in a relatively long production cycle.

High investment costs: Investment Casting requires significant investment in equipment and specialized technical support due to its demanding equipment and process technology.


Not suitable for mass production: Due to the long production cycle, Investment Casting is less efficient compared to other processes in mass production scenarios.

In summary, Investment Casting is a precision casting process with advantages such as high precision, design freedom, cost control, and material versatility. While it is suitable for small-batch or small-to-medium-scale production, its long production cycle and high investment costs limit its application in mass production. The selection of the appropriate casting process should consider the specific product requirements and production scale.


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