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Rolling bearing residual magnetic skill condition
Source: China Bearing Network Time: 2014-09-02
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1. Careful measurement of the amount of grinding at each point of the workpiece should be based on the workpiece zigzag, yaw, misalignment and depth of the tool mark to determine whether it can be ground.
(1) For the part where the grinding amount does not exceed 0. 50mm, the operator can carefully measure the values ​​of yaw, distortion, misalignment, knife marks, etc. For workpieces with a grinding amount below 0. 20mm, please refer to the relevant personnel for approval. Grinding again.
(2) If the yaw or the amount of tortuousness exceeds one third of the grinding amount, it should be straightened and then ground.
(3) Measure the diameter data at both ends of the wrong position and the yaw data at both ends; the yaw value of the maximum yaw position can be subtracted from the grinding value at the minimum diameter; the difference is the actual grinding amount. For example, the minimum diameter at the misalignment The grinding amount is 0. 40mm; the yaw value of the maximum yaw portion is 0. 30mm; the practical grinding amount is equal to 0. 40-0. 30 = 0.110mm; the grinding amount is now very small; it is likely to be in grinding Presenting a burn condition; forming a waste product.
(4) The deep part of the knife mark; before grinding, it is best to use a file to pull out some symmetrical points (the most severe and most extreme part) out of two symmetrical small planes; measure according to the smashed part. Suppose the measured diameter After subtracting the diameter of the knife mark, it is less than 0. 20mm; it should also be ground after grinding.
2. Properly handle burns during grinding (1) Before grinding, according to the above requirements, it can be seen after grinding; if it is rough, it has extra large sparks and partial burns; together, after the two reciprocating grindings, the burns can not be eliminated; The measurement of the workpiece yaw value shall be carried out. If the yaw value and the grinding amount are lower than the above-mentioned respective limit values, the alignment shall be performed. If the alignment is still not eliminated, it is necessary to invalidate.
(2) When grinding, pay attention to the change of spark; once the burn is present; the workpiece becomes waste. Unique and delicate burn; if the measured yaw value is less than one-third of the grinding amount; it can continue grinding, beyond three-thirds It should be void at a time.
The cause of burns is also related to the type of grinding wheel and the data of the workpiece. The prevention method is: repairing the grinding wheel in time, adjusting the amount of cutting (when coarse grinding or fine grinding; if the feeding amount is too small, fine burns will occur), adding sufficient coolant Adjust the workpiece and grinding wheel speed.
3. Carefully observe that the spark is too large when the spark is being grounded; the knife should be retracted immediately. The spark should not have a continuous appearance when it is fully roughed; if the yaw value of the broken part exceeds one quarter of the grinding amount; When the secondary grinding wheel is near the workpiece, the spark is gradually increased; it should be checked whether the temperature of the tip is too high; if the tip temperature and the workpiece are in common, the tip of the tail should be tight. If the spark becomes larger when passing through the bracket, the top of the bracket is marked. The location is unreasonable; the temperature is raised at this point. There should be no continuous view of the spark during the fine grinding; if the decision is severe, the yaw and the amount of grinding should be measured; when the yaw exceeds one quarter of the grinding amount, the grinding is not stand up.
4. Strictly control the processing quality and accuracy when the diameter values ​​of the points are not common; the bracket and tailstock should be adjusted in time.
(1) After coarse grinding and semi-finishing; the cylindricity of the workpiece should not exceed the difference. If there is a broken fire in the elliptical degree, the yaw value should be measured; if the value exceeds 30μm, it must be straightened. Grinding from the beginning, grinding through several rounds; when the total feed exceeds 50μm; the spark will no longer be broken; the ellipticity should be zero, if the ellipticity is still beyond the tolerance; the wheel should be trimmed Try again; if the ellipticity is still not eliminated; you should check whether the top hole can be damaged or wounded (at the moment the workpiece looks polygonal).
(2) The reason for the appearance of multi-edge after grinding is as follows: if the grinding wheel has been blunt; it should be trimmed if the grinding wheel has significant oscillation; the balance should be adjusted, the head frame and motor frame vibration isolation equipment are damaged; Correction, if the workpiece itself oscillates too much; should be properly slowed down, when the tip is too tight or too loose; must be adjusted.
(3) If the rough grinding presents a large spiral appearance; the reason is that the grinding wheel is not well-tuned; the grinding wheel must be uniform when finishing the grinding wheel; there must be no significant single-angle spark appearance; the workpiece surface is easy to appear after the grinding wheel is blunt Large spiral.
(4) During fine grinding; the workpiece tends to appear rough, scratched and the surface of the coolant is not clean. To avoid this appearance; the newly refined grinding wheel should be brushed with a wire brush (pay attention to safety).
(5) When the workpiece exhibits the appearance of taper, drum shape, saddle shape, and the diameter of both ends is larger or smaller when finishing grinding; the bracket, tailstock, grinding wheel overrun and the number of workpieces and the stop of the grinding wheel at both ends of the workpiece should be adjusted. time.
5. Strict control of the temperature of the two tip parts can determine whether the tip tightness is reasonable according to the change of the temperature of the two tips. Usually, the temperature of the tip is slightly higher than the temperature of the workpiece.
(1) The reason why the temperature of both tips is too high: one is too tight; the other is that the tip is not concentric with the middle hole of the workpiece. If the top is too tight; first loosen the tip; Adjust the tightness of the top.
(2) If the temperature of a certain tip is too high, it is clarified that the tip is not concentric with the middle hole of the workpiece.
(3) When the temperature of the two tips is common with the temperature of the workpiece; the two ends of the workpiece will not exhibit multi-angle appearance; and the spark is more uniform; at this moment, the grinding can be continued. If the two ends of the workpiece are polygonal, the tip should be tightened first; If the workpiece is not burned, it can be ground in full. When the spark at both ends of the workpiece is uneven, it is necessary to tighten the tip of the tail.
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