Pressure-Tight Hydraulic Manifold Die Casting
Pressure tight hydraulic manifold die casting case study: A413 alloy and vacuum HPDC produced blocks passing 350 bar burst and helium leak tests.
Production Capabilities
Project photos for pressure tight hydraulic manifold die casting
Finished Component
The completed die casting or machined component delivered for this project, demonstrating dimensional accuracy and surface quality.
Production & Inspection
In-process die casting operations, leak testing, machining, and quality inspection steps applied during this program.
Customer: Industrial hydraulic system integrator, Germany Program: Directional control manifold block for industrial press Annual volume: 12,000 pieces/year Material: A413 aluminum alloy Weight: 1.8 kg Requirement: 350 bar burst, 85 bar working pressure, helium leak <10^-6 mbar·L/s, no VPI impregnation
The Challenge
Previous source: sand casting, Germany. Sand casting gave adequate pressure tightness but poor dimensional consistency -3 setups required for SAE boss port machining. Customer specification prohibits VPI impregnation (long-term sealant compatibility concerns with hydraulic fluid).
The solution had to be: genuine cast-in pressure tightness at 85 bar working / 350 bar burst, with no impregnation.
Solution
Alloy: A413 (Near-Eutectic)
A413's 12% silicon produces the finest solidification microstructure of any standard die casting alloy. Shrinkage porosity significantly below A380. Accepted 8% strength reduction (290 vs 317 MPa tensile) in exchange for superior internal soundness.
Process: VADC
Cavity vacuum <25 mbar. Fill time: 95 ms at 38 m/s gate velocity. First-article X-ray: ASTM E505 Class 1 across all port face sections. Class 2 at one thick section -corrected with chilling insert on T1 modification.
Gate Placement via Mold Flow Simulation
Simulation confirmed gating at the port-face end minimized weld lines at SAE boss locations -the most pressure-critical sections. This gate position was non-obvious; the conventional choice would have placed the gate centrally.
Testing: 100% Pressure + 2% Helium Sample
- 100% nitrogen decay at 130 bar, 45s hold, <3 cm3/min limit
- 2% helium mass spectrometer sampling, <10^-6 mbar·L/s limit
Zero failures in first 8,000 production pieces. Burst qualification: 8 parts tested to destruction, all above 370 bar (minimum 350 bar).
Results vs Previous Sand Casting
| Metric | Sand casting | KastMfg A413 HPDC |
|---|---|---|
| Unit cost | Baseline | -8% |
| Port face flatness (as-cast) | 0.4-0.8 mm | 0.15-0.25 mm |
| Machining setups for ports | 3 | 1 |
| Production leak test pass rate | 96.2% | 100% (first 8,000 pcs) |
| Burst pressure (min of 8) | 380 bar | 371 bar |
| Production lead time | 8 weeks | 5 weeks |
Contact KastMfg: casting@kastdiecast.com | +86 138 1403 4409 | No.6, Rungu Road, Nanjing, China
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