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Vibration and noise generated by milling machine during machining process

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Update time : 2019-09-04 09:02:48
Vibration and noise generated by milling machine during machining process.

Once the milling machine vibrates, if it is not processed, the spindle will have a large radial runout and abnormal noise will occur, which will affect the machining accuracy of the product. Let us analyze the cause of the noise generated by the vibration of the milling machine.

Check whether the milling machine spindle is loose, remove the revision on the right side of the spindle box, use a screwdriver to slam from the slot of the lock nut, and then stop the power off. Then use the retracting knife to slant the iron, do not hold the spindle, and use a screwdriver to adjust the main bearing on the spindle. Lock the nut to achieve the tightness and cover the cover.

The whole machine shakes phenomenon, check the reason: check whether the milling machine is parallel to the main motor seatpost, the lock nut of the motor flange and the motor branch, whether the screw is loose, the head support, and whether the slide is clamped on the column. Treatment method: flatten the mattress, tighten the screws and nuts, and adjust the locking parts to be firm.

Milling machine lifting platform, the worktable is not moving smoothly, it may be loose iron, and it is suitable to adjust the inclined iron to achieve tightness.

The reasons for the noise generated by the milling machine are as follows:

1. The cutting force is constantly changing. The milling cutter has several teeth at the same time, and the cutting width is constantly changing during the milling process. Since the teeth are difficult to ensure on the same circumference, this further increases the variation of the cutting force. During the cutting process, the cutting thickness of the milling cutter teeth changes, so the cutting force also varies for each tooth.

2. The change of impact milling force and the existence of impact are the main reasons for the noise generated by milling, especially when milling the workpiece of thin-wall structure, the moment when the cutter teeth hit the workpiece, due to the difference of the rigidity of the workpiece and the material Large vibrations will occur, which will increase the noise value of the machine tool and radiate through the workpiece. To reduce the vibration, multi-edge cutting with a damper plate milling cutter on the workpiece will cause the vibration of the milling machine and generate noise. If this vibration frequency is the same as the natural frequency of the machine tool, resonance will occur and the noise will be increased. Due to the sharp change of the cutting force, the spindle and the shank generate torsional vibration, which causes the gear in the spindle drive system to be subjected to repeated impact loads, causing vibration and noise.

The milling machine is a kind of machine with discontinuous cutting. The impact change of the cutting resistance causes the vibration of the milling machine and generates noise. Therefore, in solving the noise problem of the milling machine, besides focusing on finding the noise source in the gearbox, it must be noted. The vibration problem of the milling machine structure itself.