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Common disadvantages of steel ball lapping and superfinishing in NSK bearings
Source: Bearing network time: 2018-01-13
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When looking at the diameter error and several precision of the steel ball; it is necessary to measure on the special instrument of the rule. The surface roughness and appearance quality of the workpiece after lapping are usually checked. Under the astigmatism, it is usually used for visual inspection. If there is any dispute; Double-view under the magnifying glass; and compare with the corresponding standard photo. Check the appearance quality and appearance roughness of the workpiece after super-finishing; it is necessary to extract the number of certain workpieces under the magnifying glass of 90 times and the standard photo comparison view. When visually in doubt, it can be tested on the surface roughness meter.
The method of burn inspection for fine grinding and super-finishing is to select random sampling and sampling; the quantity and quality specifications of sampling should meet the rules of burn specifications.
The reasons for the poor roughness of the steel ball in NSK bearings are:
1. The processing volume is too small; the processing time is too short.
2. The groove of the grinding disc is too shallow; the groove and the touch surface of the workpiece are too small.
3. The hardness of the grinding disc is too high or uneven hardness; and there are trachoma and pores.
4. The amount of abrasive paste is too much; or the particle size of the abrasive is too coarse.
5. The groove in the grinding disc is too dirty; there are iron filings or other debris.
Some of the reasons for the poor roughness of the surface are: the groove of the transformation grinding disc is too shallow; the touch area of ​​the workpiece is over. The lie is sturdy and obsessed with the inlaid skirt. Begging and begging.
The appearance of the wound is also a disadvantage; it often appears in the cycle processing; under severe astigmatism, it can be seen that there is a pit with a certain depth. Under the subtle astigmatism, only one black or yellow is seen. But at 90 Under the magnifying glass, the pits can be seen; the lower part is rough; the scratches are interlaced. The causes are: the depth of the grinding disc is different; the workpiece is in the deep groove due to the pressure. 惺蓖A粲惺Being restored to the heart, sorrowful, sorrowful, sorrowful, sorrowful
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