PTFE sliding bearings are designed to accommodate specific load and movement requirements in structural applications. Clients typically specify parameters like vertical loads, lateral/longitudinal movements, uplift forces, and rotational needs, which determine the bearing's configuration, material selection, and installation method. The design must account for operational temperatures, surface finishes, compressive strength, and environmental factors while ensuring maintenance-free performance through PTFE's low friction and high pressure resistance.
Key Points Explained:
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Load Requirements
- Vertical Load: Primary design consideration, with PTFE capable of handling up to 200 Kgf/cm² (2900 psi).
- Uplift Loads: Resistance to upward forces must be calculated to prevent separation.
- Lateral/Longitudinal Movement: Dictates the sliding surface area and thickness of ptfe sliding pads.
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Movement and Rotation
- Translation: Linear movement (longitudinal/lateral) influences PTFE thickness and bonding method (e.g., 3mm for ≤130°C, 5mm for ≤200°C).
- Rotation: Curved stainless steel surfaces are used for rotations >5 degrees, while flat plates with reduced contact area prevent creep.
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Material Selection
- PTFE Type: Virgin or reinforced PTFE chosen based on temperature (standard: ≤130°C; high-temp: ≤500°C with graphite).
- Backing Plate: Typically 8mm thick, recessed for higher temperatures or thicker PTFE.
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Environmental and Operational Factors
- Temperature Range: Determines PTFE thickness and material (e.g., graphite for 400–500°C).
- Surface Finish: Polished stainless steel paired with PTFE minimizes friction (coefficient as low as 0.05 under pressure).
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Installation Methods
- Options include bolting, welding (tack/full), or mortar embedment, selected based on structural constraints.
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Maintenance and Durability
- Maintenance-free design, but debris checks are recommended. PTFE’s self-lubricating properties eliminate need for regular lubrication.
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Manufacturing Tolerances
- CNC machining ensures precision for compressive strength, thermal expansion, and surface flatness.
Clients and manufacturers collaborate to balance these parameters, leveraging PTFE’s unique properties for optimal performance in bridges, buildings, and industrial systems.
Summary Table:
| Parameter | Key Considerations |
|---|---|
| Load Requirements | Vertical (up to 200 Kgf/cm²), uplift, lateral/longitudinal movement |
| Movement & Rotation | Linear translation, rotation (>5° requires curved surfaces) |
| Material Selection | PTFE type (virgin/reinforced), backing plate thickness (8mm standard) |
| Environmental Factors | Temperature range (≤500°C with graphite), surface finish (polished stainless steel) |
| Installation | Bolting, welding, or mortar embedment |
| Durability | Maintenance-free, self-lubricating, debris checks recommended |
| Tolerances | CNC machining for precision in strength, expansion, and flatness |
Need custom PTFE sliding bearings for your project? At KINTEK, we specialize in precision-engineered PTFE components tailored to your exact requirements—whether for bridges, buildings, or industrial systems. Our expertise in material selection, load optimization, and CNC machining ensures durability and performance. Contact us today to discuss your design needs and get a solution that fits!