12 methods to reduce cutting vibration of CNC milling machine


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Categories : Basic knowledge

12 methods to reduce cutting vibration of CNC milling machine

method 1:
Use sharp blades to reduce the cutting force of the CNC milling machine. Machine clamp blades are divided into coated and non-coated blades. Non-coated blades are usually sharper than coated blades, because if the blade is to be coated, the cutting edge must be passivated (ER treatment). Because the sharp edge will affect the bonding strength of the coating at the edge.

Method 2:
When the cutting depth is constant, the use of a small tool tip arc radius can undoubtedly reduce the cutting force, especially the radial cutting force, and the radial cutting force is the main cause of vibration for slender rod tools or workpieces. Whether it is ramming or milling. At the same cutting depth, the greater the radius of the tool tip arc, the greater the tendency for the slender tool shaft to vibrate.

Method 3:
When the cutting depth can be selected, avoid the cutting depth equal to the radius of the tool tip arc.

Method 4:
For key cutting with a sharp knife with a slender shank, or external turning of a slender shaft, the use of a tool with a 90° entering angle is beneficial to damping vibration. Whether it is turning a slender shaft with an external turning tool, paying more attention to the WeChat public account (CNC programming teaching) for more CNC programming knowledge, or the key tool hole of the slender tool bar, it is always 90°, the diameter produced by the tool with the entering angle The cutting force is the smallest. At the same time, the axial force generated by the blade edge is the largest.

Method 5:
For milling cutters with slender rods, round blade milling cutters are most conducive to vibration reduction. The milling cutter is opposite to the stirring cutter. The closer the entering angle is to 90°, the greater the radial cutting force, and the greater the vibration of the cutter bar. Therefore, in the face milling of the deep hole cavity of the mold, the CNC milling machine usually chooses a 45° entering angle milling cutter, if the cutting depth is less than 1mm. Often use round blade milling cutter or ball cutter.

Method 6:
When a CNC milling machine uses a slim rod end mill to mill a deep cavity. Plunge milling is often used. Plunge milling is when the tool feeds axially like a drill bit when milling deep cavities. Usually the overhang of the long rod is greater than 3 times the diameter of the shank. We recommend plunge milling with axial feed. However, the edge of the end mill insert has a radial cutting edge with a certain width. The tool supplier has technical data to prove the maximum cutting width of the tool during plunge milling.

Method 7:
In the milling of thin-walled workpieces. The cause of the vibration is entirely from the workpiece, which is called a box or bowl part. Because the vibration comes from the workpiece itself. So when dealing with the milling of such parts, it is mainly to improve the clamping of the workpiece.

Method 8:
When boring internal holes, the smaller the blade edge angle, the better. In this way, the secondary main deflection angle is large, and the vibration contact area between the secondary cutting edge and the processed surface is small, and the vibration is difficult to turn into vibration. The chance of chip squeezing by the secondary cutting edge is also small.

Method 9:
When boring internal holes, the smaller the blade edge angle, the better. In this way, the secondary main deflection angle is large, and the vibration contact area between the secondary cutting edge and the processed surface is small, and the vibration is difficult to turn into vibration. The chance of chip squeezing by the secondary cutting edge is also small.
Method 10:
Use a blade with a positive rake angle and a large relief angle. And with a brisk chip breaker. Such blades have the smallest cutting wedge angle in filing or milling, and the cutting is of course brisk.

Method 11:
Adjust cutting parameters. Adjusting the cutting parameters may only be effective when the cutting vibration is not serious. The general adjustment methods are as follows: reduce the rotation speed of the tool or workpiece, pay more attention to the WeChat public account (NC programming teaching) for more CNC programming knowledge, reduce the depth of cut and increase the amount of cutting per revolution or milling cutter. If vibration occurs during the turning of internal threads, the feed steps for thread turning can be reduced by one to two.

Method 12:
Reasonably arrange the process path of the knife. Arranging the process path of the tool reasonably is very important for milling processing. Milling is divided into down milling and up milling. In the traditional milling theory, it is described that the use of up-milling is beneficial to reduce milling vibration. In fact, it is beneficial to suppress the vibration generated by the gap of the screw. Today’s milling equipment is mostly equipped with ball or roller screws. Therefore, up-milling is of little significance. Whether it is down milling or up milling. As long as the direction of the milling force is consistent with the clamping direction of the workpiece, it will help eliminate the vibration of the bent plate parts.

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