Rolling bearing residual magnetic skill conditions (1)
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Rolling bearing residual magnetic skill conditions (1)
Source: China Bearing Network Time: 2018-03-06
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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 misaligned position and the yaw data at both ends; the yaw value of the maximum yaw portion 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 burns; forming waste products.
(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 large sparks and partial burns; together, after two reciprocating grindings, the burned parts 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, it shall be straightened. If it cannot be eliminated after straightening, 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.
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