ELASTOMERIC SEALING PREPRESS
AS568 O-Ring Gland Sizing & CNC Groove Turning DXF Guide
Elastomeric O-rings (AS568, ISO 3601, DIN 3771) are the most widely used fluid power seals in hydraulic cylinders, pneumatic manifolds, vacuum chambers, and high-pressure valves. Reliable sealing requires precise groove depth and volume fill calibration.
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1. Squeeze Mechanics & Thermal Gland Fill
Elastomer compression creates initial contact stress against the metal gland walls. Percent squeeze $\%S = \frac{W - G_d}{W} \times 100\%$ must balance sealing contact against assembly shear damage. Gland fill must remain $< 85\%$ to accommodate thermal fluid volumetric expansion.
2. Engineering Specifications & Tolerances
| Application Type | Rec. Squeeze (%) | Max Gland Fill (%) | Surface Finish (Ra) |
|---|---|---|---|
| Static Radial Gland | 15% – 25% | 80% – 85% | 0.8 µm (32 µin) |
| Static Axial Face Seal | 18% – 28% | 75% – 85% | 0.8 µm (32 µin) |
| Dynamic Reciprocating | 8% – 16% | 70% – 80% | 0.4 µm (16 µin) |
| Dovetail Vacuum Gland | 20% – 28% | 80% – 90% | 0.4 µm (16 µin) |
3. CNC Lathe Groove Turning & Vector Prepress Rules
- Internal Radii Fillets: Bottom corner radius should be R = 0.2 - 0.4mm to eliminate sharp notch stress risers without pinching seal corners.
- Lead-In Assembly Chamfer: Bore and rod entry chamfers must feature a 15° - 20° taper with polished radius corners to prevent seal shearing during assembly.
- Dovetail Angle: Vacuum retention dovetail grooves require a 24° per side undercut angle machined with dedicated dovetail ground carbide form cutters.
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