Ricerca parametrica GEB01

GEB 015


Self Lubricating Multilayer Composite Bearing

Informazioni aggiuntive

__PTFE + other polymer

__ Sintered porous bronze alloy layer

__ Steel base layer

__ Plating layer

GEB015 (see the above profile picture) is backed with copperplated steel with porous bronze sintered on the steel and polymers imbedded into the bores of the bronze. The steel back provides the products made by GEB015 with stronger mechanic strength and load capability. By combining the metals and the polymers together, its products are endowed with the lower friction coefficient and good capacity of anti-abrasion and self- lubrication. Moreover, it is a lead-free and environment protection product. Products of GEB015 series are widely applied in printing, weaving and tobacco producing machines, gymnastic equipments, shock absorbers, etc.

phisic performnce 015

Normally, the surface polymer of GEB015 is of chemical-erosion resistant quality. However it can be eroded by fused alkali metal and high temperature fluorine compounds. Therefore its erosion-prevention quality is primarily decided by the quality of the steel back and its plating layer. Air-erosion could be effectively prevented if the steel back is bronze or tin-plated. If the bush is to be used in erosive environment, the steel back needs to be plated with zinc, nickel or nickelchrome alloy, etc.

GEB015 is of much lower friction coefficient. Friction coefficient may relatively become smaller under heavier load. When the load pressure is more than 7Mpa, its friction coefficient may reduce to 0.05 or smaller. In addition, friction coefficient will also become smaller with lower linear velocity and higher temperature.

GEB015 is of excellent anti-abrasion performance, mainly due to the particular molecule structure of PTFE. The abrasion process can be generally divided into three phases, so there are three kinds of friction coefficient.
See the fright side graph:

anti abrasion 015

1. “Running-in” phase: PTFE compound on the bush is transferred to its mating surface and forms a lubricating film. At this phase, the friction coefficient is bigger, thus the abrasion pace is very quick. See the curve showed in area I of the graph.

2. “Stabilization” abrasion phase: after the “Running-in phase”, the friction happens between PTFE and PTFE, thus the friction coefficient is smaller and keeps steady. As a result, the wear rate is low and steady. See the curve showed in area II of the graph.

3. “Sharp” abrasion phase: as PTFE in the porous layer is slowly consumed up, not enough lubricant can be supplied
to the gliding media. Friction coefficient and material wear rate will rapidly rise. When 70% of the bronze surface is exposed, service life of GEB015 closes to its end. See the curve showed in area III of the graph.

Main factors that influece the service life of the bearing:

1) PV Value
PV value is an effective criterion to calculate the service life of GEB015. If there is need to prolong the service life, the load must be reduced.

2) Ambient Temperature
The higher the working temperature is, the shorter the life of the products would be.

3) Quality of the Mating Surface
Service life of GEB015 can be obviously prolonged if its mating axis is made by alloy steel or is plated by
hard chrome and with surface Roughness Ra=O,4~0.63

Altro in questa categoria: « GEB 010 GEB 016 »

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