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Permanent mold gravity casting
The tried-and-true method for quality casting
Modern permanent mold gravity casting in commercial environment uses reusable molds that are CNC machined for higher casting precision. This means gravity castings can have more detailed and complex designs, are usually more precise in their dimensional attributes and have very good as-cast surface finish. Gravity casting is also a highly repeatable process and can be easily automated, so it is well-suited for high volume production runs.
Permanent mold gravity casting may seem like a straightforward process, but a high level of skill is required to maintain casting quality. We follow a series of strict procedures to ensure our products can always meet your expectations.
Pre-casting preparations
To ensure smooth metal flow and minimal casting defects, we must first pre-heat the casting mold to between 150°C (300°F) and 260°C (500°F). We then apply a ceramic coating to the mold cavities to extend the mold’s working life and make it easier to remove the casting parts.
Impeccable craftsmanship
It is worth noting that unskilled pouring may leave visible flow marks on the finished parts. That is why we have our own casting specialists supervising the entire process, ensuring the molten metal is poured into the mold at the right speed. After the casting is done, all sprues and runners are accurately trimmed, then cleaned and painted (if required) by an experienced crew of workers.
Guaranteed quality for our gravity casting products
Our gravity casting process can produce porosity-free parts ranging from 50 grams to 70 kilograms with good dimensional repeatability and a smooth finish. All material specifications, dimensions and tolerances closely monitored and maintained by our QC specialists.
Pros and Cons of permanent mold gravity casting:
- Reusable molds
- High precision
- More detailed and complex designs
- Good as-cast surface finish
- Good mechanical properties
- Highly repeatable process
- Easily automated
- Materials with lower melting temperatures are preferred
- Geometry and size limited by the mold
- Higher tooling cost
- Expensive for small volume production
Tolerence table
| Normal dimension (mm) | Linear dimensional tolerances (ISO8062) | Linear dimensional tolerances (ISO8062) | Linear dimensional tolerances (ISO8062) | Normal dimension (mm) |
| ＞ | ≤ | CT7 | CT8 | CT9 |
| – | 10 | 0.74 | 1 | 1.5 |
| 10 | 16 | 0.78 | 1.1 | 1.6 |
| 16 | 25 | 0.82 | 1.2 | 1.7 |
| 25 | 40 | 0.9 | 1.3 | 1.8 |
| 40 | 63 | 1 | 1.4 | 2 |
| 63 | 100 | 1.1 | 1.6 | 2.2 |
| 100 | 160 | 1.2 | 1.8 | 2.5 |
| 160 | 250 | 1.4 | 2 | 2.8 |
| 250 | 400 | 1.6 | 2.2 | 3.2 |
| 400 | 630 | 1.8 | 2.6 | 3.6 |
| 630 | 1000 | 2 | 2.8 | 4 |
| 1000 | 1600 | 2.2 | 3.2 | 4.6 |
Materials
- Aluminium alloys
- Magnesium alloys
- Tin
- Zinc
- Copper alloys
- Brass
- Lead alloys
- High conductivity copper
- Other engineering alloys
We are always ready to help with your latest project.
Contact our Customer Service and let us know how we can help to catapult your next project to success.
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Phone nos.:
Asia Pacific, South America, Africa and rest of the world: +86 20 8388 7080
UK: +44 (0)808 123 0080
USA/Canada: + 1 (800) 967 2110
Asia Pacific, South America, Africa and rest of the world: +86 20 8388 7080
UK: +44 (0)808 123 0080
USA/Canada: + 1 (800) 967 2110
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