With the popularity of the linear optical axis around us, there will be more and more problems, such as the phenomenon of excessive temperature during its use. Due to the overheating of the quenched structure of the linear optical axis, the crystals of the steel are coarse, which results in the decrease of the toughness of the parts, the impact resistance and the life of the linear optical axis.
We need to judge whether the linear optical axis is overheated. You can observe from the roughness of the bearing parts whether the microstructure of the linear optical axis after quenching is overheated, but to make an exact judgment, you must still observe the microstructure. If thick acicular martensite appears in the quenched structure of GCr15 steel, it is a quenched superheated structure.
The overheating phenomenon of the linear optical axis may be caused by the quenching heating temperature is too high or the heating and holding time is too long; it may also be that the original structure band-shaped carbides are serious, causing the low-carbon zone between the two bands to form local martensite needle-like coarse Local overheating caused by.
In order to ensure the tightness, the usual method is to attach a sealing device to the supporting position of the linear optical axis. This can indeed effectively prevent the intrusion of foreign objects, but this additional sealing device also occupies a part of the space and increases the axial direction of the linear optical axis. The size brings inconvenience to use, installation and maintenance.
Not only that, there is another shortcoming of the method of adding a sealing device to the support of the linear optical axis, that is, the sealing performance is also affected by the machining accuracy and positioning tolerance of the shaft diameter and the matching part of the housing. Therefore, the traditional sealing method of the linear optical axis should be improved as soon as possible.
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