Measures to solve the problem of milling cutter turning black during use

1. Optimize cutting parameters

Reduce speed and feed: Appropriately reduce cutting speed (Vc) and feed per tooth (fz), for example, reduce speed by 20%, and reduce feed to below 0.1mm/z to reduce friction heat.

Avoid thin chips: Increase feed to above 0.15mm/z to avoid accelerated edge wear due to thin chips.

2. Strengthen cooling and lubrication

Upgrade cooling method: Use internal cooling tool holder or increase the number of nozzles to ensure that coolant reaches the cutting point directly; it is recommended to use cutting fluid containing extreme pressure additives (such as sulfurized oil).

Adjust concentration: The emulsion concentration needs to be maintained at 8%~12%, and the pH value should be tested regularly (recommended ≥9.0).

3. Inhibit built-up edge formation

Improve edge sharpness: Use blades with rake angles ≥15°, or use PVD coated blades (such as TiAlN coating) to reduce material adhesion.

Chip breaking design: Add chip breaker grooves or use corrugated edge structure to promote timely discharge of chips.

4. Tool maintenance and cleaning

Regularly remove carbon black: soak the blade with a special carbon remover (such as ethylene glycol-based cleaning agent) for 10 minutes, clean it with a soft brush and dry it to avoid mechanical scratches.

Stop inspection: stop the machine every 2 hours of continuous processing, and use compressed air to clean the residual chips in the tool groove. 5. Improve process stability

Reduce tool overhang: the clamping length of the tool handle is ≥30mm (the standard length is 30mm, and the clamping must be stable) to avoid local overheating caused by vibration.

Workpiece reinforcement: add hydraulic clamp support when processing thin-walled parts to reduce cutting vibration