|Place of Origin:||China|
|Brand Name:||TOB POM Boundary Lubricating Bearings|
|Minimum Order Quantity:||negotiated|
|Packaging Details:||Cartons and Pallets|
|Material:||Low-Carbon Steel + Porous Bronze + Yellow POM||Types:||Wrapped Bushes, Thrust Washer|
|Application:||Automotive Chassis, Forging Machines, Mine Quarrying Machines, Metal Melting And Casing Machines And In Water Irrigating And Steel Rolling Industries, Etc.||Hardness:||>270 HB|
|Working Temperature:||-40~+120℃||Max. PV Value:||Grease 2.8 N/mm²·m/s, Oil 50 N/mm²·m/s|
boundary lubrication bearing,
Steel backing + Porous bronze sintered + POM
1. POM with lead 0.3~0.5mm
2. Porous bronze 0.2~0.3mm
3. Steel backing 0.4~2.2mm
4. Copper plating 0.008mm
Note: Various materials are suitable for DX series products according to different working conditions, such as bronze-backing, stainless steel backing. DX material is an environmental friendly lead-free product and is color is orange.
DX is triple-layer self-lubricating material that can fill modified POM plastic as surface layer, it is benignant boundary lubrication material, therefore, it is particularly applicable high-load low-speed rotating and wing movement, as well as in the condition that frequent loaded start-stop is the requirement while hydrodynamic lubrication membrane is difficult to form, in the parts such as bearing, thrust washer, sliding block, ball socket and so on, DX can take full advantage of less grease to work long time without lubrication maintenance under boundary lubrication condition, But under oil-free condition, DX the frictional behavior and permissible PV value is relatively low, so generally storage pit can be formed on the plastic surface, where lithium based lubricant grease or silicone grease and so on should be applied when being installed.
DX material follows special wearing rule, which is infinitesimal abrasion can occur in R phase when being applied with grease and then being installed, But after the R phase, the boundary lubrication condition will disappear and wearing will be exaggerated. If you do refill with oil, the product can be drastically held by non-remarkable wearing and its life will also be greatly extended. Therefore the advantage of DX material is that oil shall be added with an interval of R, which is remarkably longer than that of R other metal materials. It is approximately five times long.
When DX bush is installed with application of grease such as lithium-based or silicone grease, its service life varies from the PV value under-working condition, for instance, when PV value is about 2.5MPam/s, its service life will be about 200hr; When PV value is 0.1Mpa-m/s, its service life can be above 10, 000hr (see the table for details) The cycle R of lubrication maintenance of DX bush is about the half of its service life. For instance, when PV=25Mpam/s, it is required to be oil-lubricated every 100hr
1. Good load capacity and anti-wear.
2. It is used in high load capacities and low speed with rotational, oscillating or frequent stop-start motion.
3. It can work long time without oil in the condition of boundary lubrication, under oil or grease lubrication interval, the work is longer.
4. It is machinable for the thicker of POM.
5. The bushes can be applied in auto chassis, forging machine, metallurgical, civil engineering, power station, strip rolling industries etc.
6. Widely used in the machine that Lead is unacceptable.
|PV limit||Dry||2.8N/mm2. m/s|
|Temp. limit||-40 ~ +130° C|
|Friction Coeff.||0.05 ~ 0.25Î¼|
|Thermal conductivity||2.03Kcal/M. br. c|
|Coeff. Of linear expansion||51— 10-6per° C|
|Initial pre-lubrication at assembly required|