Roupeda
2014-11-10, 10:00 PM
In bearing grinding wheel and workpiece processing and energy consumption, a small amount of grinding heat in contact region, form some brake grinding at low temperature. Application of linear static heat source heat transfer formula derivation, analysis, practice and method is applied to internal or red thermocouple is reliable, test temperature can inhibit the invention in 0.1 ~ 0.001 ms when braking, grinding temperature 15 ℃ ~ 1. Brakes in such a low temperature, let tasks outside surface depth, Clearance Of SKF Bearing (http://www.fagbearings-hk.com/) low-temperature oxidation, amorphous appearance organization low temperature tempering, quenching and burns, even the second ginobili variations.
The first major factor is the oxide film appearance
They are appearance and low temperature air brake, the role of oxygen (2) ~ 30 nm ferrous oxide thin layer. Worthy of attention and thickness of oxide layer test, decomposition layer surface grinding power corresponding relation and influence in general. It is because he and grinding process thickness of oxide layer, the indirect stamps coherent important quality marks.
The second factor and organization transparent layer
Braking scream, when in low temperature condition, when the workpiece appearance to molten iron traffic and average molecular layer, is through the metal in a very rapid cooling, pick a thin layer of amorphous layer organization. High hardness and strength, but it wasn't until about 10 nm is easy to remove the grinding processing in general.
The third factor is the low temperature tempering layer
Brakes screamed let appearances in low temperature, depth (10 ~ 100 nm) heated to a higher temperature heating workpiece on holiday. Without the austenitic temperature condition, due to the heating temperature and its progress and heating temperature will leave again looks absolutely should step by step or cryogenic tempering organization change, hardness is also accompanied by land. High heating temperature, hardness and wooden hut landing.
Bearing the judgment:
Bearing whether to enter the court, mainly considering bearing damage degree, mechanical properties, importance, trip next time maintenance decision. If there are defects can't use, need to change the new rolling mill bearing. Inner ring and outer ring, rolling body, crack, or gap, although there is a separator.
1 any gap, ring, rolling body.
2, rolling, rolling body edge coating significantly bruises.
3, separator wear significantly or significantly rivet bleak.
4, racetrack, rolling on the surface of the body surface rust, suspicious.
5, racetrack, roller surface imprinting and severe impact.
6, inner ring or outer ring surface of the surface has obvious stem diameter.
7, the obvious discoloration caused by heat.
8, sealed lubrication bearings, rolling mill in a maze or packing damage.
The first major factor is the oxide film appearance
They are appearance and low temperature air brake, the role of oxygen (2) ~ 30 nm ferrous oxide thin layer. Worthy of attention and thickness of oxide layer test, decomposition layer surface grinding power corresponding relation and influence in general. It is because he and grinding process thickness of oxide layer, the indirect stamps coherent important quality marks.
The second factor and organization transparent layer
Braking scream, when in low temperature condition, when the workpiece appearance to molten iron traffic and average molecular layer, is through the metal in a very rapid cooling, pick a thin layer of amorphous layer organization. High hardness and strength, but it wasn't until about 10 nm is easy to remove the grinding processing in general.
The third factor is the low temperature tempering layer
Brakes screamed let appearances in low temperature, depth (10 ~ 100 nm) heated to a higher temperature heating workpiece on holiday. Without the austenitic temperature condition, due to the heating temperature and its progress and heating temperature will leave again looks absolutely should step by step or cryogenic tempering organization change, hardness is also accompanied by land. High heating temperature, hardness and wooden hut landing.
Bearing the judgment:
Bearing whether to enter the court, mainly considering bearing damage degree, mechanical properties, importance, trip next time maintenance decision. If there are defects can't use, need to change the new rolling mill bearing. Inner ring and outer ring, rolling body, crack, or gap, although there is a separator.
1 any gap, ring, rolling body.
2, rolling, rolling body edge coating significantly bruises.
3, separator wear significantly or significantly rivet bleak.
4, racetrack, rolling on the surface of the body surface rust, suspicious.
5, racetrack, roller surface imprinting and severe impact.
6, inner ring or outer ring surface of the surface has obvious stem diameter.
7, the obvious discoloration caused by heat.
8, sealed lubrication bearings, rolling mill in a maze or packing damage.