servo upside down special machine. What should I do if the gear is noisy? The gear noise of CNC milling machine is caused by many factors, some of which are determined by gear design parameters. According to the characteristics of gear noise of spindle movement system in fault milling machine, the noise can be reduced by trimming the original gear without changing the original design.

1. Top of tooth trimming

Due to the influence of tooth profile error and tooth pitch, the elastic deformation of tooth load will cause instantaneous collision and impact of gear meshing. Therefore, in order to reduce the meshing impact caused by the concave and convex tooth tip, the tooth tip can be trimmed. The purpose of tooth tip trimming is to correct tooth bending deformation, compensate gear error, and reduce gear noise. The amount of trimming depends on the pitch error, the bending deformation of the loaded gear and the bending direction. Trimming is mainly for the gear pairs with the highest meshing frequency of the machine tool, and the different trimming amounts of these gears when the modulus is 3 to 5 mm.

When cutting the edge, we must pay attention to the control of the cutting amount, and adopt the method of repeated trials to avoid excessive cutting amount and damage to the effective working tooth profile, or too little cutting amount and can not play the role of cutting the edge. In the tooth profile modification, according to the specific situation of these pairs of gears, only the crown or root can be modified. Only when the crown or root cannot be trimmed to a good effect and effect, can the radial and axial values of the crown and root pruning amount be assigned to one or two gears according to the situation.

2. Control tooth profile error

Tooth profile error is caused by many factors. By observing the gears in the transmission system of the faulty milling machine, it is found that the profile error mainly occurs in the machining process, followed by the poor long-term operating conditions. The noise of tooth profile error in gear meshing is common. In general, the greater the tooth profile error, the greater the noise. For concave tooth profile, the gear teeth are impacted twice in one engagement, and the noise is very large, the more concave the tooth profile, the greater the noise. As a result, the gear teeth were modified to be moderately raised to reduce noise.

3. Control the change of center distance of meshing gear

The change of actual center distance of meshing gear will cause the change of pressure Angle. If the center distance of meshing gear changes periodically, the pressure Angle will change periodically, and the noise will increase periodically. The meshing center distance analysis shows that when the center distance is too large, the noise effect is not obvious, but when the center distance is too small, the noise is obviously increased. When controlling the center distance of the meshing gear, it is necessary to control the outside diameter of the gear, the deformation of the drive shaft, the coordination of the drive shaft with the gear and the bearing in an ideal state. In this way, the noise caused by the change of meshing center distance can be eliminated as much as possible.

4. Pay attention to the influence of lubricating oil on noise control

Lubricating oil not only plays a role in lubrication and cooling, but also plays a certain damping role, and the noise decreases with the increase of the amount of oil and viscosity. If a certain thickness of the oil film can be maintained on the tooth surface, direct contact between the meshing tooth surfaces can be prevented, and vibration energy can be attenuated, thereby reducing noise. Therefore, the use of high viscosity oil is conducive to reducing noise. The main drive system of the fault milling machine adopts splash lubrication, which will increase the disturbance noise of the oil.

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