In order to prevent the occurrence of tool breakage in CNC milling machines, the following measures can be taken:

1. Select the right tool: CNC milling machines select tools according to the processing materials and processing requirements to ensure that the tools have sufficient rigidity and strength to adapt to high-speed and high-cutting force conditions.

2. Reasonably set cutting parameters: CNC milling machines set cutting speed, feed speed and cutting depth reasonably according to the characteristics of processing materials and tools to avoid exceeding the tool's carrying capacity.

3. Correct tool clamping: Ensure that the CNC milling machine tool is correctly clamped, there is enough contact surface between the tool and the tool holder, and use the correct clamping tool and tightening force to prevent the tool from loosening or offset.

4. Regularly check tool wear: Regularly check the tool wear of CNC milling machines, including tool tip wear, cutting edge wear, etc., and replace severely worn tools in time to avoid excessive tool wear and tool breakage.

5. Maintain the stability of the machine tool: Maintain the rigidity and stability of the CNC milling machine, including the maintenance and adjustment of the machine tool structure, guide rails, slide blocks, etc., to reduce the occurrence of vibration and resonance.

6. Timely cleaning and lubrication: CNC milling machines regularly clean the cutting area of ​​the milling machine, remove chips and cutting fluid residues, and maintain a good cutting environment for the tool and workpiece. At the same time, regularly lubricate the guide rails, slides, screws and other working parts of the machine tool to reduce friction and wear.

7. Use suitable cutting fluid: CNC milling machines select suitable cutting fluids, and fill and maintain them according to processing requirements to maintain the quality of the cutting fluid and fully lubricate the contact surface between the tool and the workpiece.

8. Regular machine tool maintenance: Regularly perform maintenance and inspection of CNC milling machines, including lubrication, tightening, inspection of safety devices, etc., to ensure the stability and reliability of machine tool operation.

The comprehensive application of the above measures can effectively prevent the occurrence of broken cutters in CNC milling machines, improve processing quality and production efficiency, and reduce equipment failures and maintenance costs.