Metalworking Fluid Anti‑Foaming Tester Supplier

Preventing Foam-Related Issues with the Metalworking Fluid Anti‑Foaming Tester

Introduction
Metalworking fluids (MWF) are prone to foam generation during high‑speed machining, which impairs lubrication and heat removal. The Metalworking Fluid Anti‑Foaming Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. measures foam tendency and stability under representative conditions to guide defoamer selection and process optimization.

Testing Principle
Based on modified ASTM D892, MWF samples are placed in temperature‑controlled cylinders (25 °C and 80 °C). Air is sparged at 10 mL/min for 5 minutes through sintered diffusers. Foam height is recorded immediately and after a 5‑minute collapse. An additional high‑shear foam test simulates rotor‑stator mixing at 3,000 rpm for 2 minutes, with subsequent foam volume measurement.

Technical Design Features

• Multi‑Temperature Bath: Two independent zones for simultaneous low‑ and high‑temperature foam testing.

• Variable Air Injection: Programmable flow-rate control for different MWF formulations (5–20 mL/min).

• High‑Shear Rotor‑Stator Module: Applies controlled shear to assess shear‑induced foaming.

• Digital Foam Height Sensors: Non‑contact ultrasonic transducers measure foam columns to ±1 mm accuracy.

• Automated Reporting: Calculates foaming indices and generates comparative charts for formulation studies.

Industry Applications

• Automotive Machining: Optimize MWFs for high‑speed turning and milling operations.

• Aerospace Component Manufacturing: Ensure coolant compatibility with titanium and nickel alloys.

• General Metalworking: Screen defoamer additives for stamping, grinding, and broaching fluids.

• MWF Suppliers: Validate new formulations and maintain QC consistency.

Best Practices

1. Sample Filtration: Remove tramp oils and swarf before foam testing to isolate fluid behavior.

2. Rotor‑Stator Maintenance: Clean and inspect shear heads to prevent play that can skew results.

3. Air Quality: Use oil‑free, dried air to avoid introducing additional contaminants.

4. Replicate Runs: Perform at least three tests per sample and average foam heights for statistical reliability.