Reasons and Countermeasures for Vibration Problems in CNC Machining

In CNC milling, vibration may occur due to the limitations of cutting tools, tool holders, machine tools, workpieces, or fixtures, which can have a certain negative impact on machining accuracy, surface quality, and efficiency. To reduce cutting vibration, relevant factors need to be considered. The following is a comprehensive summary for your reference.

1. Fixture with poor rigidity:

1) Evaluate the direction of cutting force, provide sufficient support or improve fixtures

2) Reduce cutting force by reducing cutting depth ap

3) Choose sparse teeth and unequal pitch milling cutters with sharper cutting edges

4) Select a groove with a small tip arc radius and a small parallel blade band

5) Choose fine-grained uncoated blades or thin coated blades

6) Avoid machining when the workpiece is not supported enough to resist cutting forces

2. Workpieces with poor axial rigidity:

1) Consider using a square shoulder milling cutter with a positive rake groove (90 ° main deviation angle)

2) Choose blades with L-groove shape

3) Reduce axial cutting force - smaller cutting depth, smaller tip arc radius, and parallel edge band

4) Selecting Unequal Pitch Sparse Tooth Milling Cutters

5) Check tool wear

6) Check the runout of the tool handle

7) Improving tool clamping

3. Excessive tool overhang:

1) Minimize overhang

2) Using Unequal Pitch Sparse Tooth Milling Cutters

3) Balancing radial and axial cutting forces -45 ° main deviation angle, large tip arc radius, or circular blade milling cutter

4) Increase feed per tooth

5) Using a light and fast cutting blade groove

6) Reduce axial cutting depth af

7) Using reverse milling in precision machining

8) Using oversized milling cutters and using Coromant Capto ® Connecting rod of the interface

9) For solid carbide end mills and interchangeable end mills, try using milling cutters with fewer teeth and/or larger helix angles

4. Use a spindle with poor rigidity to mill the square shoulder:

1) Choose milling cutters with the smallest possible diameter

2) Choose a light and fast cutting milling cutter and blade with sharp cutting edges

3) Attempting reverse milling

4) Check the deformation of the spindle to see if it is within the acceptable range of the machine tool

5. Unstable workbench feed:

1) Attempting reverse milling

2) Tighten the machine tool feed mechanism: for CNC machine tools, adjust the feed screw

3) For traditional machine tools, adjust the locking screw or replace the ball screw

6. Cutting parameters:

1) Reduce cutting speed (VC)

2) Increase feed (fz)

3) Change the cutting depth ap

7. Poor stability:

1) Shorten overhang

2) Improve stability

8. Generate vibration in corners:

1) Adopting large programming rounded corners at lower feed rates