Servo Valves for Die Casting Presses
High-pressure die casting presses require fast, precise hydraulic control during every shot. Any delay or instability in the shot can mean scrap, downtime, or tooling damage. Domin servo valves are designed for die casting presses to give fast, reliable shot control so that the process is predictable and consistent, even in harsh environments.
The Control Challenges of Die Casting Presses
Die casting presses push molten metal into complex dies at high speeds and high pressures, so the shot must be closely monitored and controlled so that there is no flash, cold shuts, overloading, or other issues in production. To achieve this and to prevent any casting defects, die casting presses require their control mechanisms to have ultra-fast response times, closed-loop feedback for very precise movement, and low hysteresis. Velocity-to–pressure control plays a large part in ensuring
What Impacts Servo Valve Control in Die Casting Equipment
One die casting OEM incorporated Domin hydraulic servo valves into their equipment, calling out their ability to have closed-loop shot control systems for very complex castings. Visi-Trak needed a high-performance, affordable servo valve for its pilot valve on their die casting machines. Domin’s valves were used and improved the systems’ speed, weight, size, and accuracy.
|
Port Pattern |
NG06 |
NG10 |
|
Flow Rate |
2.6 to 16.6 gpm (5 to 63 lpm) |
13 to 66 gpm (50 to 250 lpm) |
|
Flow Maximum |
36.9 gpm (140 lpm) |
125 gpm (475 lpm) |
|
Leakage at 100 bar |
<0.3 gpm (<1.1 lpm) |
<0.8 gpm (<3 lpm) |
|
Response Time at 100% Step Input |
<3.5 ms |
<7 ms |
|
Frequency Response |
>250 Hz |
>140 Hz |
|
Hysteresis |
<0.2% |
<0.2% |
|
Closed-Loop Feedback |
Yes |
Yes |
When integrated into a die casting machine, those technical specs mean faster acceleration at the start of the shot, controlled deceleration at the end, and reduced flash. This level of control also helps with scrap reduction and shot-to-shot repeatability.
Our recommended valves
The Domin S6 Pro is the primary recommendation for die casting presses using NG06 systems, while the S10 Pro is recommended for those using NG10 systems with higher flow requirements (up to 66gpm / 250 lpm).