Under normal operation, the CNC machining center transmits power through gear shifting, motor direct connection and motor direct drive to maintain the steady operation of the equipment. Friction, deformation, shock and vibration are unavoidable, resulting in a certain amount of mechanical noise.

Under normal circumstances, these mechanical noises will not have a negative impact, but when the main components in the spindle system are abnormal, such as the resonance of the headstock, the unsatisfactory dynamic balance of the spindle, etc., it will cause the excitation response force of the components. Above the normal value, the resulting vibration and noise are getting bigger and bigger. So how to solve this problem, let's take a look.

Top trimming to reduce gear noise

If it is due to the elastic deformation of the gear tooth load, the instantaneous collision and impact when the gear meshes, resulting in increased noise, it is necessary to reduce the meshing impact formed by the concavity and convexity of the tooth tip, so as to achieve the purpose of reducing noise, and the best way is To trim the tooth tip, correct the bending deformation of the tooth, and compensate for the fault of the gear at the same time.

Effective control of tooth profile errors

The tooth profile fault generally occurs in the process of processing, caused by poor operating conditions for a long time, the greater the fault, the louder the noise, the more concave the tooth profile, the louder the noise. Therefore, it is necessary to effectively control the fault of the tooth shape, carry out the training of the gear teeth in time, maintain the convex shape of the parts, and reduce the generation of harmful noise.

Pay attention to the change of the center distance of the meshing gear

The change of the center distance of the meshing gear will cause the pressure angle to change correspondingly, which will cause a chain reaction, and the noise will increase periodically with the pressure angle. From the practical test, when the center distance is too large, it has little effect on the noise change, and when the center distance is too small, the noise will be significantly enhanced. Therefore, special attention should be paid to the change of the center distance of the meshing gear, and try to eliminate the noise caused by this change. necessary noise.

Pay attention to the suppressing effect of lubricating oil on noise

In addition to the function of lubricating and cooling, lubricating oil can also maintain a certain oil film on the tooth surface, and prevent the direct contact of the meshing tooth surface through the oil film, thereby reducing vibration and noise. According to daily operating experience, the best way to lubricate the gear is to supply oil on the meshing side, which can not only achieve cooling, but also form an oil film on the tooth surface before entering the meshing area, so as to achieve the best noise reduction effect.

Last few words

In short, the spindle noise fault of CNC machining center is a relatively common system problem, and its causes are relatively complicated, but as long as you master the mechanical structure and workflow of the spindle, and carefully analyze the specific performance of the fault, you will be able to find the cause of the fault, and then prescribe the right medicine as soon as possible. Resume normal processing operations to reduce corporate cost losses.

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