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Oil based cutting fluid has good lubrication performance and poor cooling effect. Compared with oil based cutting fluid, water-based cutting fluid has relatively poor lubrication performance and good cooling effect. Slow cutting requires strong lubrication of cutting fluid. Generally speaking, cutting oil is used when the cutting speed is lower than 30m/min. Cutting oil containing extreme pressure additive is effective for cutting any material when the cutting speed does not exceed 60m/min. During high-speed cutting, due to the large heat generation and poor heat transfer effect of oil-based cutting fluid, the temperature in the cutting area will be too high, which will lead to smoke, fire and other phenomena in the cutting oil. In addition, because the workpiece temperature is too high, thermal deformation will occur, which will affect the machining accuracy of the workpiece, so water-based cutting fluid is used more.
The disadvantage of emulsion is that it is easy for bacteria and molds to multiply, and the effective components in the emulsion will be decomposed chemically to stink and deteriorate. Therefore, organic bactericides with low toxicity should be added generally.
The disadvantage of chemically synthesized cutting fluid is poor lubrication, which will cause adhesion and wear of moving parts of the machine tool. In addition, the viscous residues left by chemical synthesis will affect the movement of machine parts, and will also cause corrosion on the overlapping surfaces of these parts.
From the price point of view, for the cutting of some free machining materials that do not require high surface quality of the workpiece, the use of general water-based cutting fluid can meet the requirements of use and can greatly reduce the cost of cutting fluid.
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