Foaming in cutting oil typically occurs when air bubbles remain stable on the surface of the liquid. This adversely affects both lubrication performance and pump/system efficiency.
Main causes of foaming:
1. Incorrect mixing ratio
- An incorrect water-to-oil ratio, especially in emulsion-type cutting fluids, increases foaming.
2. High-pressure cooling systems
- High-speed spraying from nozzles introduces excess air into the fluid.
3. Insufficient antifoam additives
- Low amount or depletion of defoamer additives in the formulation over time.
4. Contamination and foreign matter
- Chips, detergent residues, or cleaning chemicals can trigger foam formation.
5. Low system level / turbulence
- Low fluid level in the tank or improper return flow increases air ingress.
6. Water quality
- Soft or excessively hard water can disrupt emulsion stability, leading to foaming.
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