根据淮安INA轴承工作面磨削变质层的形成机理，影响磨削变质层的主要因素是磨削热和磨削力。
According to the formation mechani*** of grinding metamorphic layer on Huaian INA bearing working face, the main factors affecting grinding metamorphic layer are grinding heat and grinding force.
其次，分析了常州伊犁轴承失效的原因之一。
Secondly, one of the reas*** for the failure of Yili bearing in Changzhou is analyzed.
1。轴承磨削热
1. Bearing grinding heat
在轴承的磨削过程中，砂轮与工件的接触区消耗大量的能*量，产生大量的磨削热，导致磨削区局部瞬时高温。通过推导、计算或利用线性运动热源传热的理论*公式，或用红外和热电偶法测量实验条件下的瞬时温度，可以发现磨削区的瞬时温度为0.1-0.001 ms，***高温度可达100。0.150。0摄氏度。这种瞬时高温足以引起高温氧化、非晶态结构、高温回火、二次淬火，甚至在淮安INA轴承工作表面一定程度的表面上燃烧。
In the grinding process of bearings, the contact area between grinding wheel and workpiece c***umes a lot of energy and generates a lot of grinding heat, which leads to local instantaneous high temperature in the grinding area. By deducing, calculating or utilizing the theoretical formula of heat transfer of linear moving heat source, or measuring the instantaneous temperature under experimental conditi*** by infrared and thermocouple method, it can be found that the instantaneous temperature of grinding zone is 0.1-0.001 ms, and the *** temperature can reach 100. 0.150. 0 degrees Celsius. This instantaneous high temperature is enough to cause high temperature oxidation, amorphous structure, high temperature tempering, secondary quenching, and even combustion on the working surface of Huaian INA bearing to a certain extent.
（1）表面氧化层
(1) Surface oxide layer
在瞬间高温的作用下，钢的表面与空气中的氧气反应，形成一层薄薄的氧化铁（20-30nm）。值得注意的是，氧化层的厚度对应于表面磨料变质层的总厚度。结果表明，氧化层厚度与磨削过程直接相关，是衡量磨削质量的重要指标。
Under the action of instantaneous high temperature, the surface of steel reacts with oxygen in the air to form a thin layer of iron oxide (20-30 nm). It is noteworthy that the thickness of the oxide layer corresponds to the total thickness of the surface abrasive metamorphic layer. The results show that the oxide layer thickness is directly related to the grinding process and is an important index to measure the grinding quality.
（2）非晶态结构层
(2) Amorphous structure layer
当工件表面在磨削区高温瞬时熔化时，熔化的金属分子流均匀地覆盖工作表面，迅速冷que母材，形成非常薄的非晶结构。它具有较高的硬度和韧性，但只有10纳*米左右，在精*密磨削中容易去除。
When the workpiece surface melts instantaneously at high temperature in the grinding zone, the molten metal molecule flow uniformly covers the working surface, rapidly cooling the que base metal, forming a very thin amorphous structure. It has high hardness and toughness, but only about 10 nanometers. It is easy to remove in precision grinding.
（3）回火层
(3) Tempering layer
淮安INA轴承磨削区的瞬时高温可以使工件表面在一定程度（10-100nm）内加热到高于工件回火温度的温度。当未达到奥氏体化温度时，随着加热温度的升高，表层逐层产生与加热温度对应的再回火或高温回火***转变，硬度相应降低。加热温度越高，硬度下降越严重。
The instantaneous high temperature in the grinding zone of Huaian INA bearing can heat the workpiece surface to a temperature higher than the tempering temperature of the workpiece to a certain extent (10-100nm). When the austenitizing temperature is not reached, with the increase of heating temperature, the surface layer by layer produces re-tempering or high temperature tempering structure transformation corresponding to heating temperature, and the hardness decreases accordingly. The higher the heating temperature, the more serious the hardness decrease.
（4）双淬火层
(4) Double quenched layer
当磨削区的瞬时高温将工件表面加热到高于奥氏体化温度（AC1）时，该层的奥氏体化***在随后的冷que过程中被重新淬火为马氏体。二次淬火烧*伤的工件在二次淬火层下bi须有一个硬度很低的高温回火层。
When the instantaneous high temperature in the grinding zone heats the workpiece surface above the austenitizing temperature (AC1), the austenitized structure of the layer is re-quenched to martensite during the subsequent cold queuing process. The Bi of the workpiece burned by secondary quenching must h***e a high temperature tempering layer with very low hardness under the secondary quenching layer.
（5）磨削裂纹
(5) Grinding Cracks
二次淬火烧*伤可以改变工件表面层的应力。淮安INA轴承二次淬火区处于压缩状态。二次淬火区以下高温回火区的材料具有***大的拉应力，是***易发生裂纹的部位。裂纹***容易沿原始奥氏体晶界扩展。严重烧*伤会导致整个磨削表面出现裂纹（主要是裂纹），导致工件报废。
Secondary quenching burns can change the stress of the workpiece surface layer. The secondary quenching zone of Huaian INA bearing is in compression state. The material in the high temperature tempering zone below the secondary quenching zone has *** large tensile stress, which is the crack-prone part of ***. The crack *** is easy to propagate along the original austenite grain boundary. Severe burns will lead to cracks (mainly cracks) on the whole grinding surface, leading to the scrap of the workpiece.
文章来自：淮安SKF轴承 www.wh-
Article from: Huaian SKF Bearing www.wh-
文章来自：淮安INA轴承 a-
Article from: Huaian INA Bearing a-
文章来自：淮安NSK轴承
Article from: Huaian NSK Bearing
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