Selection of the hottest metal cutting fluid

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Selection of metal cutting fluid

I. simple observation method of good cutting fluid:

take a small amount of emulsified oil, mix it with 10~30 times of water in a mineral water bottle, shake it and let it stand for a while: 1 There is no oil and scum on the upper layer 2 There is no hanging wall on the bottle wall and no milk dregs 3 The stock solution and diluent have no stratification after standing for a long time (the stratification of the stock solution is mostly caused by the improper lipophilic and hydrophilic balance value HLB, and some are caused by the increase of the alkali value, which destroys the balance; the stratification of the diluent is mostly caused by the deterioration of hydrophilicity caused by the imbalance of emulsifier) 4 The stock solution has no pungent smell (formaldehyde, phenol, ammonia, etc.), and it is a uniform transparent or slightly turbid liquid when observed at the light transmittance. 5 It feels non heating, lubricated and easy to wash off. The diluent is applied to the back of the hand and the pores of the arm without itching, redness or red pimples. 5 If the conditions are good, the concentration can be measured with a simple refractometer (the price is very low) 6 The rust prevention performance of the products can be compared with that of the processed parts. Then, soak the processed parts with diluent and put them on the white paper. Hold them with a tea bowl to keep the humidity. Generally, there are no rust spots on the white paper within two or three days for better ones (for cast iron and carbon steel materials, other materials have a relatively longer time)

II. Classification of water-soluble cutting fluid:

at present, the water-based cutting fluid sold on the market mainly includes the following types: emulsified oil (including saponified oil), ordinary cutting fluid, antirust cutting fluid, long-term antirust cutting fluid, microemulsion. According to the classification, it can be seen that the mainstream equipment is digital impact testing machine and microcomputer controlled screen impact testing machine, semi synthetic cutting fluid, synthetic cutting fluid and other varieties, and some requirements contain extreme pressure properties

saponified oil and general emulsified oil

is a cheap cutting fluid used in the early stage. Most of the waste oil is saponified with sodium hydroxide after sulfation. Its main purpose is to emulsify. It has poor rust prevention, short service life and easy to stink. Due to low-cost deployment and technology, some products are very smelly (smelly soap, smelly residue, smelly naphthenic acid). The products with poor quality cannot be emulsified at all. The oil floats on the water, but the emulsifier at the bottom makes the water appear white

ordinary cutting fluid

is a product similar to micro lotion, which was accidentally developed in the production process of micro lotion. It does not have the characteristics of transparent or translucent micro lotion, and is slightly white, but it contains a large amount of water, so the cost is low, and it contains a lot of water-soluble rust preventive agents and anti-corrosion bactericides that cannot be dissolved by saponified oil, so its quality is greatly improved compared with saponified oil (general emulsified oil), However, its ratio to water is small, mostly about 10 times water (no more than 15 times). In order to reduce the generation cost, many products have low additive content, which is not only difficult to use, but also must be analyzed or analyzed from the chemical point of view. After a long time, it is easy to stink, blacken and rust. In order to enhance the anti rust effect of the product, more anti-corrosion and anti rust agents such as sodium nitrite and potassium dichromate that are easy to cause skin cancer or toxic and irritate the skin are added. Some are made by mixing naphthenic acid or waste acid residue and acid oil from small refineries directly with about 30% sodium hydroxide water, and then adding a large amount of water-soluble rust inhibitors such as urea and sodium nitrite

antirust cutting fluid

contains a large amount of oil-soluble antirust agent and a small amount of water-soluble antirust agent. According to different customer requirements, products with different antirust periods (2-15 days) can be produced. According to different processing materials, different models of products specifically for cast iron, steel, copper, aluminum and their alloys can also be produced. Products from regular manufacturers can be used safely, However, some products are easy to precipitate or layer due to low content of antirust agents, poor compatibility of various antirust agents, and different selection of base oil; In order to prevent odor in summer, users are required to regularly add antiseptic and bactericide, or sodium carbonate, etc. to the liquid, causing a lot of inconvenience to users. Regular manufacturers with mature technology can completely overcome such problems. At present, some products are milky white because of the addition of water and water-soluble anti rust preservatives on the basis of automatic temperature control, automatic timing and automatic alarm in the emulsified oil-based low-temperature tank. Research and exploration have adopted the methods of joint funding of employers and finance, such as water-soluble film-forming agents, which have low prices, long anti rust period, good quality and different concentrations, and have slowly occupied a certain market, However, some customers think that adding water does not accept

long term Anti Rust cutting fluid contains a large number of well compatible anti rust agents, more than two kinds of anti-corrosion fungicides, more than three kinds of anionic and non-ionic surfactants suitable for soft and hard water, more durable alkali value reserve agents, defoamers, etc. Therefore, its anti rust ability, emulsifying ability, cleaning performance, anti-corrosion resistance have been greatly improved, with good anti rust effect and long service life


the aqueous solution of the real microemulsion is transparent or translucent, which is conducive to the observation of the processed workpiece. The product overcomes the problems of easy corruption, poor rust prevention and poor cleaning of emulsified oil; The synthetic fluid is characterized by poor lubricity. It is a cutting fluid that has just started in China, has the best application and good development prospects. It is mainly composed of more than half of surfactants, rust inhibitors, preservatives, fungicides, etc., and added with different pigments (mostly blue, green, fluorescent yellow, fluorescent red, fluorescent green, etc.), However, there are also many products added with water-soluble thickener and a small amount of activator in the market, which are often called micro lotion, with low concentration and low price, and many substances toxic to human body are applied, affecting the quality image and sales market of the overall micro lotion

synthetic cutting fluid

synthetic cutting fluid produced before in Chinese Mainland has good rust prevention, cleaning and corrosion resistance, but poor lubricity. In recent years, polyalkylene glycol ether borate, phosphate ester lubricants and synthetic water-soluble sulfur phosphorus extreme pressure agents have been introduced into the products of Japan, Germany, Taiwan, China, and some mainland manufacturers. These lubricants have good inverse solubility and are enriched in the contact surface when the temperature of cutting parts and cutters is high, providing lubrication and effectively protecting the cutters. However, due to the high cost of polyether, water-soluble extreme pressure agents and better lubricants, and the high price of products from regular manufacturers, some small manufacturers have applied water-soluble tackifiers (starch, carboxymethyl fibroin, polyvinyl alcohol, etc.), sodium nitrite, sodium benzoate, rust inhibitors with low equivalence of urea, and pigments (mostly green), so the product quality is also mixed

III. select

when users choose cutting fluid, they should choose their own cutting fluid according to the use condition and the condition of machined parts, such as stainless steel and other hard materials, as well as tapping, deep drilling and other processes need cutting fluid with good extreme pressure performance, and reduce the multiple of water addition; When processing aluminum parts, it is easy to have "bonding" phenomenon, chip nodules or cutting marks, strip cracks, etc., and then after a long time, the emulsion is easy to delaminate due to excessive alkaline reaction with aluminum; When processing copper, we should first compare the product quality, and then calculate the economic applicability. We should not only listen to the price per kilogram, but also compare the proportion of water and service life. Although the price of some products is very low, the proportion of water is small (only about 10 times), and the service life is short. (end)

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