Cutting vibration is a major machining problem for the daily operation of a machining center. For thin-walled parts, once the vibration is large, there will be violent vibration with an amplitude exceeding tens of μm, usually accompanied by a lot of noise. Although this situation can also be processed, obvious vibration scratches are often left on the processed surface, which is not allowed for the finishing surface requirements of thin-walled parts.

The harm of cutting vibration is far more than these. We know that if the vibration occurs during processing, there will be relative displacement between the tool and the workpiece, which will cause vibration marks on the machined surface, which will inevitably seriously affect the surface quality and performance of the part; when cutting vibration occurs At times, the processing system will continue to bear the action of dynamic alternating loads, the tools are extremely easy to wear, and the connection characteristics of the machining center are damaged. In addition, high-decibel harsh noise will be generated in the vibration, which will damage the health of the operator.

We know that a machining center is a CNC milling machine with a tool magazine, and cutting can be said to be the most common machining process in a machining center. We share with you several methods to reduce the cutting vibration of machining centers, and hope to be helpful to you. Let's take a look.

How to reduce cutting vibration in the machining center

• For key turning of sharp knives with slender shanks, or external turning of slender shafts, use 90. The cutter with the entering angle is good for vibration damping. Whether it is turning a slender shaft with an external turning tool, or the key hole of the slender tool holder, it is always 90. , the radial cutting force generated by the tool with the entering angle is the smallest. At the same time, the axial force generated by the blade edge is the largest.

• For milling cutters with slender rods, round insert milling cutters are the most beneficial for vibration reduction. The milling cutter is the opposite of the stirring cutter, the closer the entering angle is to 90. , the greater the radial cutting force, the greater the vibration of the tool bar. Therefore, the CNC milling machine usually chooses 45 in the face milling of the deep hole cavity of the mold. Entering angle milling cutters, if the depth of cut is less than 1 mm, round insert milling cutters or ball cutters are often used.

• When CNC milling machines use slender rod end mills to mill deep cavities. Twelve methods of reducing the cutting vibration of CNC milling machines are often used to reduce the cutting vibration of CNC milling machines. Plunge milling means that the tool feeds axially like a drill. When milling deep cavities, the overhang of the long rod is usually greater than 3 times the diameter of the shank. We recommend the plunge milling method 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.

• In the milling of thin-walled workpieces, the cause of the vibration is entirely from the workpiece, which is called a box-type or bowl-type part. Since the vibration comes from the workpiece itself, when dealing with the milling of such parts, it is mainly to improve the clamping of the workpiece.

• When boring in inner holes, the smaller the blade edge angle, the better. In this way, the secondary main declination angle is large, the chattering contact area between the secondary cutting edge and the machined surface is small, and the chattering is difficult to turn into vibration. The secondary cutting edge squeezes The chance of crumbs is also small.

Conclusion

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