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What is permanent mold casting?
Permanent mold casting is a process of forming metal parts with reusable steel molds using gravity to fill them. Some people call it gravity casting. Technically it is one of the gravity-casting processes because sand casting is also gravity-casting. Because the molds are usually steel, the surface quality is better than sand casting. The molds usually are CNC machined and then coated with a refractory material to prevent the parts from sticking to the mold. Molten metal is poured into the mold through the pouring gate. Open the mold to take the part out after material solidification.
What are the advantages of permanent mold casting?
1. Low Mold Cost
Compare to sand casting, the permanent mold cost is higher, but it is much lower than die casting. It is a very good process for medium volume, for example, several thousands of parts.
2. High Accuracy
The molds are cut from steel, the accuracy is higher than sand mold.
A chart to compare all these processes above
Processes | Dimensional Accuracy | Surface Quality | Production Efficiency | Geometry Adaptability | Mold Cost | Part Cost |
Sand Casting | Good | Good | Good | Best | Best | Good |
Permanent Mold Casting | Better | Better | Better | Good | Better | Better |
Investment Casting | Better | Better | Good | Better | Better | Good |
Die Casting | Best | Best | Best | Good | Good | Best |
What is permanent mold casting?
Permanent mold casting is a process of forming metal parts with reusable steel molds using gravity to fill them. Some people call it gravity casting. Technically it is one of the gravity-casting processes because sand casting is also gravity-casting. Because the molds are usually steel, the surface quality is better than sand casting. The molds usually are CNC machined and then coated with a refractory material to prevent the parts from sticking to the mold. Molten metal is poured into the mold through the pouring gate. Open the mold to take the part out after material solidification.
What are the advantages of permanent mold casting?
1. Low Mold Cost
Compare to sand casting, the permanent mold cost is higher, but it is much lower than die casting. It is a very good process for medium volume, for example, several thousands of parts.
2. High Accuracy
The molds are cut from steel, the accuracy is higher than sand mold.
A chart to compare all these processes above
Processes | Dimensional Accuracy | Surface Quality | Production Efficiency | Geometry Adaptability | Mold Cost | Part Cost |
Sand Casting | Good | Good | Good | Best | Best | Good |
Permanent Mold Casting | Better | Better | Better | Good | Better | Better |
Investment Casting | Better | Better | Good | Better | Better | Good |
Die Casting | Best | Best | Best | Good | Good | Best |
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