Solve any abnormal phenomenon encountered during the use of metal cutting fluid! It's so capricious!
June 02, 2022
How to ensure the best use of cutting fluid or effectively extend its service life? Usually the method adopted by enterprises is to find high-quality cutting fluids. But the actual application proves that the answer is: after the correct selection, do a good job in daily maintenance and maintenance. Today, I recommend a cutting fluid collection, which can solve almost all abnormal phenomena you encounter in the process of using metalworking fluids.
1. Rational use of cutting fluid Rational use of metal cutting fluid can improve the use effect of metal cutting fluid, ensure workpiece processing quality, prolong tool life, and reduce processing costs; rational use of cutting fluid can effectively reduce cutting force, cutting temperature, and machining. Thermal deformation of the system, extending tool life and improving machined surface quality. The main functions of metal cutting fluids in mechanical removal processing are cooling, lubrication, cleaning and rust prevention. The effect of the cutting fluid depends not only on the various properties of the cutting fluid itself, but also on the processing requirements, workpiece materials, tool materials and processing methods. 1) It should be selected according to the processing requirements During rough machining, the cutting amount is large and a large amount of cutting heat is generated. In order to reduce the cutting temperature, a water-based cutting fluid with good cooling performance should be used at this time. When finishing, the workpiece is required to obtain the best surface quality and small surface roughness value, so cutting oil should be used. 2) Corresponding to different processing methods In contemporary machining, cutting methods are varied. For example, turning, milling and drilling usually require high-efficiency processing, so water-based cutting fluids should be used; while broaching and gear cutting, more expensive and complex tools must be used to ensure processing quality and long-term use of the tool. Therefore, it is best to use oil-based cutting fluid. 3) It should be selected according to the different materials of the workpiece and the tool Different materials of tools and workpieces have different high temperature resistance, machinability, hardness, etc., and different cutting fluids should be selected at this time. For example, when machining workpieces with low hardness such as gears, a cutting fluid with a higher viscosity should be used to prevent scratches on the surface of the gears; and when cutting hard-to-machine materials such as stainless steel, extreme pressure cutting oil or extreme pressure emulsion should be used. . 4) To choose according to the characteristics of the machine tool itself For some high-efficiency and valuable equipment, from the perspective of maintenance, oil-based cutting fluids with stable physical and chemical properties should be used to prevent metal parts from corroding, rusting, and obstacles in the moving parts of moving parts. However, it is generally not suitable to use oil-based cutting fluid for some open machine tools, so as to avoid a large amount of volatilization and dissipation of the cutting oil. 2. Daily maintenance and maintenance of Metal Working Fluid As daily maintenance, the first thing to think about is the control of product concentration. Any brand or type of cutting fluid is recommended by the manufacturer. This is not only related to the cutting fluid itself, but also directly related to the processing technology of the customer. Our suggestion is to strictly control the concentration within the recommended range during routine maintenance. For processes with high requirements on finishing or processing quality, increase the concentration by 1%-2% on the basis of the manufacturer's recommended range. Reduce the influence of machining quality and tool life caused by concentration fluctuations, and also effectively prolong the life of cutting fluid. However, the actual maintenance cost is not as much as imagined. The reason is that most of the evaporated water during processing is water, so the rehydration concentration will be much lower than the recommended concentration under normal circumstances. How to reduce the fluctuation of cutting fluid concentration? There are the following measures: First, it is the control of liquid level and concentration. 1) Maintain a reasonable liquid level. Generally speaking, the liquid level of the centralized liquid supply system is controlled between 60%-80% of the liquid tank capacity; the liquid level of a single machine should not be lower than 80% of the liquid tank capacity. 2) Set the target value, that is, the middle value of the concentration range; if it is lower than this value, fluid should be added; 3) When adding liquid, it is recommended to use a mixer. If there is no mixer, it should be added at the maximum flow rate when adding liquid, so that the original solution can be dispersed as soon as possible; Secondly, it is to monitor the pH value of the cutting fluid, which is like the body temperature, too low or too high is unfavorable. Generally speaking, the optimal range of cutting fluid is between 8.8-9.5. However, the problem of cutting fluid is more "low fever", especially in summer when the operating rate is not high, the probability of pH reduction will be more. What if the pH value drops? 1) Still within the controllable range, the concentration can be appropriately increased by 1-2%, and the management of oil slicks and regular circulation can be strengthened; 2) When the pH value is between 8.5 and 8.8, an appropriate amount of the pH enhancer specified by the manufacturer can be added, and the microbial content can be detected; 3) When the pH is less than 8.5, the cutting fluid will be accompanied by peculiar smell. At this time, sterilization treatment is required immediately. At the same time, it is necessary to contact the cutting fluid supplier to find out the cause and formulate a reasonable solution.
