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How to effectively deal with the surface residue of metal working fluid

One of the main functions of metalworking fluids is to provide inter-process rust resistance to the part, which is accomplished through the rust-proof film left on the metal surface. Therefore, the discussion here is not whether the metalworking fluid leaves a residue, but whether the residue is purposefully left behind.

The residue of metalworking fluid on the part affects the amount of metalworking fluid taken away, the function of use, the filtration, the cleanliness of the machine and the part, and the replacement of grinding wheels on the grinder.

Metalworking fluid machine tool surface residues have the possibility of sticking to the iron chips and grinding wheel ash, when they are stuck to the residue, iron chips, grinding wheel ash will produce similar scrapers and abrasives, resulting in wear and tear on the machine seals, guides and slides, cams and tappets. So the machine tool maintenance to remove the residue.

Residues can be observed simply and effectively by filling a glass dish with 5 ml of cutting fluid concentrate and allowing it to be exposed to atmospheric conditions at room temperature for a month or more. In general, the longer the exposure time in the atmosphere the better to see the results of the cutting fluid being oxidized. A properly formulated cutting fluid is oxidized. This experiment can also be performed with the addition of different machine tool oil spill contaminants and minerals in the water at the same time.

Residues can be minimized bySelecting the right process fluid so that its residues are acceptable for your application and are otherwise more functional for your requirements.

Run the process fluid at the proper concentration. If you use twice the concentration of processing fluid that can meet the minimum concentration required for the job, you will also get twice the residue.

Use high quality water to mix the processing fluid whenever possible. “Hard water” is one of the main sources of cations, which can react with the components in the processing fluid to produce water-insoluble residues.

Remove residues and metal chips from the liquid tank in a timely manner. They may also be a source of cations.

Periodically “rinse” the machine with machining fluid. The residue formed by water evaporation is redissolved. This also reduces the amount of replenished machining fluid. In short, regular cleaning makes it easy to keep the machine clean.

(6) If a more difficult residue appears on the machine, it is helpful to gently spray or brush a compatible surfactant on the machine surface so that it penetrates into the residue before cleaning.

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