Fully Automatic Gold Bar Casting Machine

What is a Vacuum Gold/Silver Bar Casting Machine?

A vacuum casting machine melts gold/silver and pours it into molds inside a vacuum or inert gas chamber.

👉 Purpose:

• Remove oxygen → no oxidation
• Avoid air bubbles → no porosity
• Get mirror-finish bars
• Reduce metal loss

Machines often use vacuum + argon/nitrogen protection to ensure high-purity casting.

⚙️ How It Works (Simple Process)

1. Metal (gold/silver scrap or granules) loaded
2. Induction furnace melts metal (up to ~1200–1500°C)
3. Chamber creates vacuum (~ -98 kPa)
4. Molten metal poured into graphite mold
5. Cooling under controlled environment
6. Finished bar comes out smooth and dense

🏭 Key Features You Should Check 1. Capacity

• Small: 1kg – 2kg
• Medium: 4kg – 12.5kg
• Large: 15kg – 30kg per cycle

👉 Example:

• 4 × 1kg bars in one cycle
• 1 × 30kg bullion bar

2. Temperature Range

• Typically 1200°C – 1500°C
• Suitable for gold & silver melting

3. Vacuum & Gas System

• Vacuum pump (important quality factor)
• Argon/nitrogen protection
• Eliminates:
  • oxidation
  • shrinkage
  • surface defects

4. Automation

• PLC + touch screen control
• One-click casting process
• Temperature precision ±1°C

5. Production Speed

• 1 batch in 6–12 minutes
• High-output models can run continuously

6. Cooling System

• Water cooling / chiller required
• Keeps system stable

🟢 Advantages (Why Vacuum Machines Are Used)

• ✔ High purity bullion (investment grade)
• ✔ Mirror finish (less polishing needed)
• ✔ No metal loss (important in gold)
• ✔ Consistent bar weight
• ✔ Safer (closed chamber, no flame)