How do grinding fluid manufacturers correctly prepare the concentration ratio?

In the field of metalworking, the concentration ratio of grinding fluid is directly related to machining quality, equipment lifespan, and production costs, making it a critical link in the manufacturing process that cannot be ignored. Properly preparing the concentration ratio not only maximizes the cooling, lubricating, rust-preventing, and cleaning functions of the grinding fluid but also prevents machining defects and equipment failures caused by improper concentrations. Therefore, mastering scientific concentration preparation methods is of great significance for grinding fluid manufacturers to enhance product competitiveness and ensure production stability.

1. Pre-preparation
Before preparing the grinding fluid, adequate preparation must be carried out to ensure the accuracy and safety of the process. First, carefully read the product technical data sheet (TDS) to understand the manufacturer's recommended concentration range, preparation methods, and precautions. Different models of grinding fluids have varying chemical compositions and application characteristics, so they should not be treated as identical. Second, prepare appropriate measuring tools and ensure they are clean and calibrated to avoid preparation errors caused by tool inaccuracies. Meanwhile, check the quality of both the grinding fluid concentrate and the dilution water. Hard water or water containing impurities can affect the stability and performance of the grinding fluid; therefore, deionized or softened water is recommended. Operators must wear protective equipment, such as gloves and safety goggles, to ensure safety.
 

2. Preparation Steps
The correct preparation steps are the core of ensuring concentration accuracy. First, follow the principle of "water first, then fluid." That is, add the calculated amount of water into a clean container first, and then slowly pour in the required amount of grinding fluid concentrate while stirring slowly to promote uniform mixing. Never add water directly into the concentrate, as this can easily cause clumping and uneven emulsification. Second, stirring should be thorough but not excessive to avoid generating too much foam. After stirring, it is recommended to let the solution rest for a moment to mature before conducting a concentration test. If automatic mixing equipment is used, its proportioning control system must be calibrated regularly to ensure accuracy. Throughout the entire process, contamination must be avoided, and all containers and tools must be kept clean.

3. Concentration Testing and Verification
Concentration testing and verification must be conducted after preparation. Common testing methods include the refractometer method, titration, and chemical analysis. The refractometer method is widely used due to its simple, fast, and intuitive operation, but attention must be paid to temperature compensation and regular calibration. Test results should be recorded and compared with the target concentration to ensure that the preparation accuracy meets the requirements.

4. Adjustment and Correction Methods
When testing reveals that the concentration deviates from the target range, timely adjustments and corrections are necessary. If the concentration is too high, add an appropriate amount of water to dilute it; if it is too low, add the concentrate to increase the concentration. During adjustment, the same operating procedures as the initial preparation should be followed. After adding, stir thoroughly and retest until the concentration reaches the standard range. Avoid drastic one-time adjustments; it is recommended to use a step-by-step approach with small, incremental additions to gradually approach the target value.

5. Regular Monitoring and Maintenance
The concentration of grinding fluid changes during use, so a regular monitoring system must be established. Due to water evaporation and fluid carry-out, the concentration of the working fluid will gradually increase; conversely, it may decrease due to the addition of dilution water. It is recommended to set a reasonable testing cycle based on usage frequency and machining intensity to promptly detect concentration changes and make adjustments, ensuring the working fluid is always in optimal condition.
Conclusion