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Common problems and causes of machining defects of cross roller bearing surface workpieces
 

Cross roller bearing plays a decisive role in the industrial production, while following the development of the scientific and technological progress and production machinery, but in the cross roller bearings bearing grinding will still happen some problems, surface grinding grain is one of common problems. Then the FRB BEARINGS with everyone understand the cause of the bearing surface defects.

I. cross roller bearing ring with a straight waveform on the surface:
The grinding piece of work is truncated and enlarged, and the surrounding area approximates the sine wave. The center along the axis of the axis has no rotational motion, and the path around the sine wave is the waveform cylinder, which is also called polygon. The cause of the waveform is that the movement of the grinding wheel relative to the workpiece or the grinding wheel is the cause of the periodic change in the pressure of the grinding of the workpiece. The vibrations may be forced vibrations or self-induced vibrations, so there is often more than one straight ripple on the artifact.

The specific reason for the trace of the bearing direct waveform is:
1.Large clearance of main shaft of grinding wheel;
2.The grinding wheel is too hard;
3.The grinding wheel is not balanced or the wheel becomes dull.
4.Excessive speed of the workpiece;
5. The horizontal Qi knife is too large;
6.Grinding wheel spindle bearing wear, the clearance is too large to produce radial pulsation.
7.Wheel compacting mechanism or stage "crawl" etc.

II. Surface reappearance of burn marks:
The surface of the workpiece is often burned in the process of grinding, the burn is several types, one is the burn along the grinding direction of the wheel, the black spot is black. The second is the line or the broken line. The surface of the workpiece is burned in the grinding process, and there are several reasons for this:
1.The grinding wheel is too hard or the granularity is too small.
2.The quantity of supply is too large, the cutting fluid supply is insufficient, the cooling condition is poor. 3.The workpiece is too low and the wheel is too fast.
4.The wheel vibrate too much, and it burns because of the constant change in the depth of the grinding. 5.The grinding wheel is not well trimmed or trimmed;
6.The diamond is sharp and the wheel is not well trimmed.
7.The workpiece is very badly burned when it is rough, and the amount of it is too small to be worn off. 8.The workpiece is suspended, the workpiece is suspended, and so on.
So how does the surface of an artifact know if it is burned during grinding? This is checked by periodic pickling.

III. Cross roller bearing surface roughness is not required
The surface roughness of the bearing parts has standard and technological requirements, but in the process of grinding and superfine, for various reasons, the requirements are often not met. The surface roughness of the workpiece can not meet the requirements of the main reason is:
1.The low grinding speed, feed speed too fast, large amount of feed, feed grinding time too short;
2.Excessive speed of the workpiece, or excessive vibration of the workpiece shaft and the shaft of the shaft;
3.The grinding wheel is too coarse or too soft;
4. The grinding wheel is too fast or too much clearance.
5.The diamond of the grinding wheel is not sharp or quality;
6.It is not good to use the oil stone and the installation position is incorrect.
7.The superfine does not meet the requirements for the quality of kerosene.
8.Super time is too short.


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