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How to use the cutting fluid in a surface grinding machine?


How to use the cutting fluid in a surface grinding machine?
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Grinding is the last process of bearing machining, which has a direct impact on the accuracy, performance and service life of bearing products. In the process of machining, coolant plays a very important role in preventing workpiece burn, improving the surface accuracy and roughness of workpiece, improving the antirust ability of workpiece and machine tool, and prolonging the service life of cutter and machine tool. Therefore, the reasonable use and maintenance of grinding fluid is very important in the bearing processing.

Function of cutting fluid

The role of cutting fluid in the bearing processing process using wet machining, can greatly improve the cutting ability and service life of the tool, improve product accuracy, reduce scrap rate. The main advantages of using cutting fluid in wet machining are:

Lubrication: cutting fluid can lubricate the tool and improve the cutting ability of the tool;

Cooling effect: a certain flow of cutting fluid can move the cutting tropics, thus reducing the temperature of the cutting tool;

Chip flushing function: the chip liquid can wash off the chip and drop it into the chip discharge ditch for discharge. At the same time, the chip discharge in the ditch can also be realized by the cutting liquid;

Improve the surface roughness of the workpiece: the cutting fluid will wash away the iron chips on the machining surface, which will not scratch the machining surface, thus improving the roughness;

Reduce corrosion: select appropriate cutting fluid to prevent corrosion of workpiece and machine guide rail;

 

Reasonable use of cutting fluid

Cutting fluid can be roughly divided into oil-based cutting fluid and water-based cutting fluid. Oil based cutting fluid, such as the cutting fluid used in the ultra precision machining of bearing factory, which mainly uses kerosene and adds a small amount of mechanical oil. Generally, oil-based cutting fluid only contains solid impurities such as abrasive particles and chips after processing parts. In practice, only solid impurities need to be separated to obtain clean cutting fluid, so its treatment is relatively simple. The other is water-based cutting fluid, represented by emulsion, in which fine oil droplets are highly dispersed in the water, and the emulsion also contains various surfactants, antirust agents and other additives. After the emulsion passes through the processing part, it contains solid impurities such as abrasive particles and chips, and it is also easy to breed microorganisms.

Maintenance of cutting fluid

The maintenance of cutting fluid is also a very important factor for prolonging the service life of emulsion, besides the selection of appropriate quality and reasonable use of coolant. The maintenance work of cutting fluid mainly includes the following items:

  1. Ensure that the liquid circulation line is unblocked and timely remove the metal scraps, metal powder, mould mucus, decomposition of cutting fluid itself, grinding wheel ash, etc. in order to avoid blocking.
  2. It is very important to inhibit the growth of cutting fluid (especially emulsion). In the process of using cutting fluid, the content of bacteria should be checked regularly and corresponding measures should be taken in time.
  3. In order to purify, the metal powder and floating oil in the cutting fluid should be removed in time to eliminate the environment of bacteria growth.
  4. Check the pH value of cutting fluid regularly and take corresponding measures in time in case of great changes.
  5. Add cutting fluid in time. As the cutting fluid will be consumed continuously in the process of recycling due to splashing, atomization, evaporation and carrying of processing materials and chips, new fluid shall be added in time to meet the constant total circulating fluid of the system.

Purification of cutting fluid

The filtration and purification of cutting fluid is the process of removing a certain proportion of relatively large solid particles from the cutting fluid. After filtration and purification, the cutting fluid can be reused in machining to achieve the purpose of recycling. The advantages of cutting fluid filtration and purification are mainly shown in the following aspects:

  1. Extend the replacement cycle of cutting fluid: according to the practice of our factory, the replacement cycle of the filtered cutting fluid can be greatly extended.
  2. Improve the service life of cutting tools and grinding wheels: in recent years, research shows that if the impurities (such as debris, grinding wheel powder, etc.) in the cutting fluid are reduced from 40 μ m to less than 10 μ m, the service life of cutting tools (or grinding wheels) can be extended by 1-3 times.
  3. Improve the surface roughness of workpiece and reduce the rejection rate.
  4. Extend the service life of the pipeline and pump set. The solid particles in the cutting fluid will accelerate the wear of the pipeline and pump components.

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