Pressing coins, medallions, or bullion requires precise control over force, design depth, and material thickness. Choosing the correct hydraulic press ensures sharp, consistent designs, prevents material deformation, and maximizes production efficiency. This guide explains how to determine the appropriate press tonnage based on coin specifications and provides tips for selecting a high-quality coin hydraulic press.
1.Understanding Coin Pressing Force
The tonnage of a hydraulic press refers to the maximum force it can apply. Coin pressing involves metal flow into dies, embossing the design onto the coin surface. Key factors affecting the required tonnage include:
- Coin Diameter and Thickness: Larger diameter or thicker coins require more force.
- Design Complexity and Relief Depth: Deep relief or intricate patterns increase resistance.
- Metal Type: Gold, silver, and platinum have different hardnesses; harder metals need higher force.
- Number of Sides Pressed: Double-sided striking may require more tonnage than single-sided stamping.
Example Calculation:
| Coin Size | Metal | Design Depth | Recommended Press Tonnage |
| 20mm x 2mm | Gold | Standard logo (0.3mm) | 5–10 tons |
| 30mm x 3mm | Silver | Moderate relief (0.5mm) | 15–20 tons |
| 50mm x 5mm | Gold | Deep, intricate design (1mm+) | 50–80 tons |
| 60mm x 5mm | Platinum | High-relief collectible | 80–120 tons |
2.Selecting the Right Hydraulic Coin Press
When choosing a press for coin production, consider the following factors:
a. Tonnage Capacity:
- Ensure the press can provide slightly higher force than the maximum required, allowing flexibility for different coin sizes and metals.
b. Die Compatibility:
- Check the size and thickness of dies supported by the press.
- Ensure easy installation and alignment for double-sided dies.
c. Stroke and Speed:
- Adequate stroke length ensures the coin is fully pressed.
- Adjustable pressing speed prevents metal tearing or deformation.
d. Automation and Control:
- Modern hydraulic coin presses come with PLC control, programmable tonnage, and safety interlocks.
- Automation allows for batch production with consistent quality.
e. Material Compatibility:
- Confirm the press can handle gold, silver, platinum, and copper alloys, depending on your product line.
3.Tips for Coin Design and Pressing
1.Simpler Designs Require Less Force:
- Low-relief logos or standard hallmarks can be pressed with smaller tonnage.
2.Deep Relief or Intricate Patterns:
- Designs exceeding 0.5–1mm depth require significantly higher tonnage.
3.Metal Hardness Matters:
- Platinum and hard alloys need stronger presses than soft gold or silver.
4.Multiple Coin Sizes:
- If producing various sizes, choose a press with adjustable tonnage to accommodate all products.
5.Maintenance and Longevity:
- Proper lubrication, die alignment, and routine checks prevent premature wear and maintain pressing quality.
4.Juyi Hydraulic Coin Press Advantages
Shenzhen Juyi Industrial Co., Ltd. offers high-quality hydraulic presses for coin, bullion, and medal production:
- Wide Tonnage Range: From 5 tons for small coins to over 100 tons for large, high-relief coins.
- Precision Force Control: Ensures consistent depth and sharpness across batches.
- Versatility: Suitable for gold, silver, platinum, and alloys.
- Automation: PLC-controlled presses with adjustable speed, stroke, and pressure for high-volume production.
- Durable Construction: Robust frames and hydraulic systems for long-term reliability.
5.Conclusion
Determining how many tons to press a coin depends on the coin size, metal type, relief depth, and design complexity. Selecting the right hydraulic press ensures precision, efficiency, and product consistency. Juyi’s range of hydraulic coin presses provides manufacturers with the flexibility, accuracy, and reliability needed to produce gold and silver bars, coins, and collectible bullion to the highest standards.
