Foaming coolant during metalworking and machining creates a big problem. Although a small bit of foam is completely normal, excessive foaming of coolants is a problem that should be addressed right away as it doesn’t cool a part or effectively lubricate a tool, along with a list of other issues.
Excessive foaming of coolants for metalworking can primarily be classified under two main categories: chemical and mechanical. Chemical issues typically stem from tramp oil in your coolant or too highly concentrated coolant. Mechanical problems that result in foaming are operating at the wrong pump pressure and cracks in hoses. Although these are common problems, see our more complete list and solutions to your foaming coolant issues below for additional causes.
What causes machine coolant foaming?
- Concentration too high / low
- Machine cleaner in sump
- Mechanical – lines on suction side leaking, cracks in hose, loose fittings, impeller cavitation
- Soft water
- Pump pressure too high
- High tramp oil content
- Fluid level too high / too low
How to solve machine coolant foaming problems
- Adjust concentration to specification
- Check pH – drain re-charge if necessary
- Repair or replace hose, check pump for hair-line cracks and fix or replace if necessary
- Sample water, treat if necessary
- Regulate as needed
- Skim off oil; check for leaking lines
- Adjust fluid levels
The Right Coolant for Your Machining Needs
Make sure your system is operating at its peak performance, reducing problems that may cause foaming and a variety of other unnecessary issues that can slow up production and frustrate operators, by selecting the best coolant for your machining needs. AFT, Inc.™ offers a full line of premium coolants, which includes synthetic, semi-synthetic, soluble oil, and high oil semi-synthetic that are proven to improve performance and longevity.
If you are unsure of which would be best for you, contact us today to learn more about our fluid management services.