Ricerca parametrica GEB01

GEB 010

General Purpose steel plate

Informazioni aggiuntive

Schermata 03-2456012 alle 19.58.38__PTFE + Pb

__ Sinteref porous bronze alloy layer

__ Steel base layer

__ Plating layer

GEB 010 (see the above profile picture) is backed with copper-plated steel with porous bronze sintered on the steel and polymers imbedded into the bores of the bronze. The steel back provides the bush made by GEB 010 with stronger mechanic strenght 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, the steel back is plated with a erosion-prevention layer. Products of GEB 010 series are widely applied in printing, weaving and tobacco producing machines, gymnastic equipments, shock absorbers, etc.

Schermata 03-2456012 alle 19.58.16

Normally, the surface polymer of GEB 010 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 tinplated. If the bush is to be used in corrosive environment, the steel back needs to be plated with lead, zinc, nickel or nickel-chrome alloy, etc.

GEB 010 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.

Schermata 03-2456012 alle 20.10.21 GEB 010 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.

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 1 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 phrase: as PTFE in the porous layer is slowly consumed up, not enough lubricant can be supplied to the gliding media. Friction coefficient and wear rate will rapidly rise. When 70% of the bronze surface is exposed, service life of GEB 010 closes to its end. See the curve showed in area III of the graph.

Main factors that influence the service life of the bearing

1) PV Value
PV value is an effective criterion to calculate the service life of GEB 010. 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 GEB 010 can be obviously prolonged if its mating axis is made by alloy steel or is plated by hard chrome and with surface Roughness Ra=0,4~0.63

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