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Why can't the slewing ring use elastic washers?

2020-12-30

1] First of all, when the slewing ring is connected with bolts and nuts, the bolts are required to be high-strength bolts (10.9). The connection of high-strength bolts mainly depends on the strong friction between the connected plates to resist external forces, so high-strength bolts do not need spring washers.

2] Secondly, the touch area of ​​the spring pad is not as large as that of the flat pad. In the case of large pre-tightening force, the flat pad is not firm, and the bolts with larger pre-tightening force (such as the pre-tightening of bolts of grade 8.8 and above) are possible The plastic deformation of the adjacent supporting surface of the spring washer is formed. In future use, the pre-tightening may appear "relaxed" as the deformation increases. For reversing machinery, the vibration and overturning moment during operation will be relatively large. If the spring washer is added to open the mouth, it will increase the vibration intensity and cause the deformation of the slewing ring.

3] In addition, a suitable flat pad can increase the supporting area, to a certain extent, avoid the kneading deformation of the workpiece with insufficient hardness when the bolt is pre-tightened, which is beneficial to maintain the firmness of the pre-tightening.


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