One Preparation method
Cutting fluid Preparation It is related to the stability of diluent. Before the cutting fluid is used, the dilution ratio and the volume of the required diluent must be determined first. Then calculate the cutting fluid used. ( Crude solution )Quantity and quantity of water. First, water is injected into the dispensing tank., Then stir (or circulate) and add the amount of fluid. 。 When the diluent is prepared, the speed of the addition of the original solution does not appear.dissolve into a liquid The original fluid is accurate. After mixing, the concentration was determined by Refractometer until the desired concentration was obtained.
Cutting fluid join water Shun in Order must not be reversed.
Two Supplementary method
The consumption of liquid or evaporation of water during use will result in concentration deviation or decrease of liquid volume. The correct way to add is to press first. One The preparation method is formulated with diluent and added into the liquid tank. If the concentration is low, it can be directly added to the original solution and then determined by the refractometer until the desired concentration is achieved.
Water quality requirement
Because the water soluble cutting fluid is diluted with water, the quality of the water will directly affect the performance of the cutting fluid. Generally, the ideal water quality requirements are as follows:
Adverse effects beyond ideal value
Six ~ Eight
Too low or too high to affect diluent. PH value
Eighty ~ One hundred and twenty PPM
Lower than Eighty Easy to produce bubbles that are difficult to remove; higher than
One hundred and twenty Will reduce the stability and life of the liquid.
Too high is easy to cause rust.
Sulfate ion content
Too high is easy to cause rust.
Other unlisted impurity ions are not listed in general tap water due to their low contents. If the water quality of customers is special, they should be fully considered when they are used.
Management in use process
Because the water soluble cutting fluid is a kind of unstable system in strict sense, it is directly related to the service life and performance of the liquid.
First, Management of cutting fluids being used
One , Keep the prescribed concentration and replenish the new fluid in time when the cutting fluid is consumed.
Two , Keep clean to prevent foreign matter and dust from entering.
Three , Remove slick and chip in time.
Four , Daily circulation of cutting fluid at least. 1~2 Hours, especially holidays.
Five , When PH Lower than Eight Two Replenish new fluids and adjust them in time.
Six Regularly remove chips, sludge and sludge.
Two. Monitoring content of water soluble cutting fluid
Stable and uniform
No less than two times a week.
greater than Eight point two
less than 2%
less than Two Milliliter /10Minute
Rust resistance cast iron
monolithic Twenty-four hour qualified
Lamination Eight hour qualified
Once a month (seasonally strong)
less than Ten Five / Milliliter
Chloride ion content
less than 70PPM
One Concentration management
As the concentration of liquid is directly related to the performance of the liquid, if the concentration is abnormal, the following problems may occur:
* Bubbling problem
* Impact on the human body (irritating the skin)
* Influence on mechanical lacquer surface
* Dirt is easily formed around machinery and machinery.
* Poor machinability (due to insufficient lubricity leading to tool life, machining accuracy, and finish finish).
* Rust, such as machineries, machinery, chips, etc.
* Low corrosion resistance (shortened life)
Therefore, concentration management is the most important part in the management of water-soluble cutting fluids. Regular determination Diluent The concentration was kept at recommended concentration. + One It is an important means to ensure the normal use of cutting fluid. The commonly used concentration measurement method is determined by refractometer, but there is a certain error in the cutting fluid after use. Users should learn from experience.
Two , PH Value management
PH The reduction of the value is one of the direct causes of the corrosion of the liquid and the rust of the workpiece. PH Value and keep it within the range of the index value, will effectively prevent the use of liquid premature corruption and rust phenomenon. PH The best way to determine the value is to use it. PH To avoid mismanagement caused by test paper errors. If found PH The phenomenon of reduction in value is first examined by concentration, if the concentration is normal. PH The value is upwards to the organic amine or alkali; if the concentration is low, the original solution is first replenish and the concentration is corrected. PH If the value is still low, organic ethanolamine or alkali should also be added. PH Value. PH The management target value of the value is Eight point five Above, in general, when PH Lower than Eight We should consider supplement. PH Upward agent.
Three Miscellaneous oil management
Usually the water soluble cutting fluid has certain anti oil ability, but a large amount of miscellaneous oil (such as rail oil, hydraulic oil, etc.) will greatly aggravate the deterioration of the liquid, resulting in the use of liquid separation, corruption and so on. Therefore, in order to remove mixed oil in a timely manner, it is necessary to record the supply of lubricating oil regularly and repair the leakage area in time, so that the mixing amount of miscellaneous oil will be reduced to a minimum, which will effectively prolong the service life of the liquid and reduce the use cost.
Four Chip management
Because the new chip has strong reactivity and consumes the active ingredients of the liquid, the timely removal of chips (for example, installation of filters, magnetic separators, etc.) is also an important means to maintain the performance of the liquid.
Five Bacterial count management
The microorganisms in cutting fluid are mainly bacteria and yeasts in soil. In fact, the incorporation of microbes is unavoidable. Therefore, in order to prevent the use of liquid spoilage, the number of bacteria in the liquid should be exceeded. One X Ten Five individual /ml Immediately add fungicides. BK 1000ppm (use liquid) 10000L When is 10L ) The number of bacteria in the liquid can be determined by Schmid. The results are in One X Ten Three individual /ml The following is the ideal value. Users can also add bactericides regularly according to their experience to ensure the service life of the liquid.
Six Rust prevention management
Cast iron is very easy to rust material, especially in the high temperature and humidity season, we must pay special attention to its rust prevention. The deterioration of rust resistance of general water soluble cutting fluids can be divided into the following:
A Low concentration
B Bacteria reproduction (antirust additives are decomposed by bacteria).
C , PH Low value
D Accumulation of chloride and sulfate ions in water. 500PPM This is dangerous and has a great effect on rust prevention.
Therefore, when the rust resistance is low, first deduce the reasons, and then take the following countermeasures for various reasons.
A The reason is low concentration. Supplemental solution concentration
B The reason is bacterial multiplication. Add to BK sterilization
C The reason is PH The value is low... Increase of organic amine or alkali. PHvalue
D The reason is ion accumulation. Increasing concentration and supplementing treated water quality
E If no countermeasures can be resumed, they should be restored. Replacement of new liquid 。
Replacement of new liquid
In the daily use of cutting fluids, even if new fluids are supplied and well managed, they will gradually deteriorate. Once the main performance can not meet the requirements, new fluids must be replaced.
Usually, the liquid exchange cycle of a single machine is Six to Seven Six months, the centralized liquid supply system is Two Year.
Even with good maintenance, the cutting fluid still needs to be replaced. The life of the new liquid depends on the cleanliness and disinfection effect of the coolant system, especially the water-soluble cutting fluid. If the characteristic parameters of the cutting fluid can not be recovered even after being corrected, it should be replaced. When the water soluble cutting fluid is applied to the following circumstances, it should be replaced:
One The smell of cutting fluid is unpleasant.
Seven Floating thick foam on the surface
Thirteen The water is too hard.
Two The cutting fluid becomes unstable.
Eight Tool life degradation
FourteenDeterioration of filtration performance
9 PH Increase or decrease
Fifteen If soap is formed
Four Degradation of cutting fluid performance
Ten Microbial multiplication
SixteenDeterioration of workpiece surface quality
Five A large amount of sediment is gathered on machine tools.
Eleven Electrolyte level increase
SeventeenThickening of cutting fluid
Six Excessive solid and liquid impurities
Twelve Cutting fluid circulation pipe blockage
The old cutting fluid to be replaced often contains a lot of metal powder and dirt, and a certain amount of detritus and dirt is accumulated inside the machine tool pipe. Therefore, in order to remove the accumulated dirt, the system must be cleaned to prevent contamination of new liquid, resulting in the rapid decay of new liquid.
The steps to replace the new fluid are as follows:
One , Emptying stock solution As far as possible, emptying the original working fluid completely.
Two , Scavenging: thoroughly remove the working fluid system and liquid tank with working fluid, machine tool surface, pump and circulation piping system and filtration system, and remove objects including chips, sludge, impurity oil, sludge and other impurities without leaving dead ends.
Three , Cleaning and sterilization: use 1~2% Cutting fluid and 0.1~0.3% The disinfectant is used to prepare the cleaning liquid, and the circulating cleaning system is at least not lower than that of the disinfectant. One Hours can be extended to Four Hour.
Four , Emptying, check cleaning effect. 。
Five , Add new liquid, after operation cycle, confirm the concentration. Access to normal use.