How to simply judge the performance and quality differences of different cutting fluids? You only need to spend 5 minutes, and you can save at least 10% How can machinery factories simply judge the performance and quality differences of different cutting fluids? The following is a set of the simplest way to compare the main performance indicators of different cutting fluid products, you only need to spend 5 minutes, you can save at least 10% of the cost. 01 Cutting fluid performance The longer the tool life and the better the finish of the machined surface, the better the lubrication performance of the cutting fluid. In the case of the same equipment, the same tool and the same workpiece, compare the tool life (the number of parts that can be processed by a single tool or the cutting distance) and the machining quality (surface finish). Lubrication performance is a very important index of cutting fluid. Directly affect the processing quality and cost. However, it is not possible to judge intuitively, because you can not know the formula of the cutting fluid and the amount of effective lubrication components. 02 Stability Stratification, impurity and non-uniformity appear in any of the following two items. The cutting fluid stability can be determined to be poor. 1. Take an appropriate amount of the original solution and place it in a transparent container for 24 hours to observe whether the original solution has stratification and impurities, and whether it is uniform; 2. Take an appropriate amount of the original solution, prepare 5% diluent with tap water, and stand in a transparent container for 15 minutes to observe whether the diluent is uniform, whether there are layers and impurities. 03 Foam properties Through the experiment, the foam can disappear within 15 seconds, and the foam performance is qualified, the sooner the better. Prepare the 5% diluent and place in a clear reagent bottle with the lid closed. Then shake the reagent bottle up and down with normal force for 15 seconds, and then stand on the table to start timing and observe: if the foam produced in the bottle can disappear within 15 seconds, the faster the disappearance rate is the better. The foam performance is qualified. 04 Rust and corrosion prevention The longer the time, the longer the natural anti-rust and anti-corrosion ability. Configure the appropriate amount of 5% concentration diluent, select the machining parts of moderate size (there are machining surfaces after cutting) to soak in the cutting fluid for an appropriate time (half an hour to several hours. According to the length of processing time of the parts), it is taken out in the air to observe the rust or corrosion of the parts after 3-5 days. Special note: This performance can only be preliminarily judged by this method. For some special materials (such as aviation aluminum alloy), strict laboratory verification is often required. 05 Antibacterial ability The sooner the cutting fluid becomes smelly, the worse its antibacterial ability. Configure the appropriate amount of 5% concentration diluent and stand in the container to smell the change of the taste of the cutting fluid regularly. This is directly related to the service life of the cutting fluid. The principle of inhibiting bacteria of most products is based on the bactericide in the product formula, only a very small number of products, using advanced biological bacteriostasis, effectively solve the problem of potential harm to the skin of the bactericide. 06 Anti-miscellaneous oil ability Observe the change of the dividing line: The cutting fluid with weak anti-impurity oil ability will soon mix with the oil and make the dividing line become more and more blurred. Configure an appropriate amount of 5% concentration diluent and stand in a transparent container, and then drip an appropriate amount of hydraulic oil or rail oil into the cutting fluid. The oil will float on the surface of the cutting fluid, and there will be a clear dividing line between oil and water. 07 Whether it contains nitrite Use a special nitrite test strip to test. Or ask the manufacturer to provide MSDS file. If the test paper turns red, 99% of the time it can be determined to contain carcinogenic nitrite. The deeper the reddness, the higher the content. Mainstream imported brand products do not contain nitrite; However, the use of nitrite as an Anti-Rust Additive in domestic products is very common. For the safety and health features of the product, it is an effective way to ask the manufacturer to provide the MSDS file and ask the content of it. For inferior products, the supplier usually fails to provide the MSDS file of the product or provides a fabricated MSDS file that is difficult to justify itself. 08 Consumption of cutting fluid carried away Two kinds of cutting fluid, other properties are similar; One kind of unit price 7,500 yuan a barrel, the other price 9,000 yuan a barrel. With the same amount of processing, the former consumes 2 barrels per month, while the latter consumes only 1.5 barrels. Which one would you buy? A simple calculation shows that the cost of the latter, which is significantly higher, is 10% lower than that of the former, which is cheaper. Diluents of the same concentration can be prepared separately from two reagent vials and maintained at the same capacity. Then take two identical standard samples (such as two long steel rods), dip them into the cutting fluid in the reagent bottle in the same way and remove them (the cutting fluid will adhere to the sample and drip on the outside). After repeating the same dipping action for the same number of times, compare the amount of cutting fluid remaining in the reagent bottle. The remaining more, indicating that the cutting fluid is not easy to be taken away by parts and chips and consumed. Taking away products with high consumption will bring higher use costs. In addition, there is a lack of simple methods for comparing cooling performance. However, as long as it is a water-soluble product, the cooling performance is not very different. For the fully synthetic grinding fluid, there are also settleability requirements. That is, the ability of grinding chips and metal particles to settle rapidly in the grinding fluid. This can be a very intuitive observation of the change in the transparency of the grinding fluid. Products with better sedimentation can maintain good transparency for a long time. There are many specific evaluation methods for the performance evaluation of cutting fluid in the laboratory, but in the general factory, the above
simple method can also be used to obtain a relatively considerable and effective evaluation.
