PTFE sliding bearings are a very crucial component of any load-bearing structure that may suffer heat or mechanical movement. Despite all this, its design and construction remain a mystery, with many consultants and civil engineers preferring to keep the bearing’s specific composition and dimensions in the hands of the bearing manufacturer.
A PTFE sliding bearing appears to be a straightforward construction. It primarily consists of two layers: a PTFE plate and a polished stainless-steel plate. These two materials have the lowest coefficient of friction of any two solids and glide over each other smoothly, especially when exposed to high pressures.
Advantages of Side Bearings:
- The unit is cost-effective because of the simplicity of the bearing design and ease of production and installation.
- Construction costs can be lowered by planning for growth rather than constraint.
- Even in the worst-case scenario, the coefficient of friction over the bearing surface remains the same.
- The bearings require no maintenance — PTFE and graphite are both naturally self-lubricating, and PTFE will absorb all dirt or gritty particles. Simple protection against considerable dirt infiltration is all that is necessary.
Advantages of PTFE Slide Bearings:
The texture of Materials:
Because of the recessing condition, the optimal thickness has been determined to be 5mm. This is thick enough to accommodate some construction misalignment as well as mud and grit embedment.
Bolting, tack-welding, complete welding, or mortar embedment can be used to secure the bearing components to the installation, and the right type of bearing should be selected based on the installation method. During installation, the PTFE should be fully covered against welding spatter, paints spray, metal excess material, and other pollutants.
To ensure a consistent contact area, the top bearing should be bigger than the bottom pad by an amount proportional to the projected movement.
The temperature at the PTFE surface should normally be less than 120 C and not more than 200 C. In typical conditions, the temperature drops by 200 ° C for every 100mm away from the hot. Temperature is not generally a concern. If the bearing temperature is expected to go above 200 ° C, a thermal insulator should be installed between the structure and the bearing back surface.
When acoustic or vibration reduction is required, slide bearing units can be produced with a range of elastomer composite interlayers or backings to meet the design criteria of the client. Elastomers can be employed for basic angular or rotational motions.
When a succession of slide bearings is used to make a slideway, such as for oil rig movement, the slideway supports must be sufficiently rigid to prevent individual bearing bending or unbalanced loading. A few degrees of deflection can greatly increase the perceived friction coefficient and induce bearing failure if all of the load is handled by one end of the bearing surface.
Reduces constructive costs:
It is more cost-effective to execute and design such as bridges, markets, and car parks with expansion in hope rather than focusing on strain putting on rigid elements. Its maintenance-free.
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