FAG bearings grinding heat

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(1) the surface oxide layer
Instantaneous under high temperature steel surface and the role of oxygen in the air or into a thin (20 ~ 30nm) thin layer of iron oxide. It is noteworthy that the oxide thickness and surface grinding of the metamorphic layer total thickness of the test results showed a corresponding relationship. This shows that the oxide layer thickness and grinding process is directly related to an important symbol of the grinding quality.ball bearing companies

(2) amorphous tissue layer

FAG bearings grinding instantaneous heat the surface of the molten state, the molten metal molecular flow is evenly coated on the surface of the work, and the base metal to be cooled extremely rapidly, forming a very thin layer of non- crystalline tissue layers. It has high hardness and toughness, but it is only about 10nm, it is easy to be removed in precision grinding.machine bearing

(3) layer of high temperature tempering

Instantaneous high temperature of the grinding zone can make the surface a certai n depth (10 to 100nm) is heated to a temperature higher than that of the workpiece tempering heating. With the improvement of the heating temperature in the case did not reach the austenitizing temperature, the surface layer will result in organizational changes that corresponds with the heating temperature to return fire or high temperature tempering, the hardness decreases. The higher the heating temperature, the decrease in hardness is also more powerful.thrust bearing

(4) the second floor of hardened layer

FAG bearings grinding the instantaneous high temperature of the surface layer is heated to above the austenitizing temperature (Ac1), the austenitizing organization of the layer in the subsequent cooling process, but also be re-quenched martensite organization. Where there are secondary quenching the workpiece burn, the secondary hardening layer under high temperature tempering layer must be very low hardness.

(5) grinding cracks

Secondary quenching burn will make the surface layer of stress changes. Secondary quenching zone in compression, the following high-temperature tempering zone material existence of the maximum tensile stress, here is the most likely to crack the core. Crack is most likely to spread along the original austenite grain boundaries. Serious burns can cause the entire grinding surface cracks (mostly cracks) caused by the workpiece scrapped.