Water-based metal coolants must be properly compounded and maintained at a reasonable concentration range to maximize performance. When the concentrate and water of the coolant are mixed and poured into the reservoir and central system of the machine, the concentration of the coolant must be tested to ensure that the initial concentration is correct. The concentration can be measured using a Heiner chemical refractometer or a concentration tester.

The concentration can be expressed as a percentage or as a ratio of the metal coolant concentrate to the total volume of the mixture. For example, add 4 liters of concentrate = 4% or 1:25 in 96 liters of water. Typical metal coolant concentrations range from 5% to 10%. The ideal mode is to measure the concentration daily and adjust as required. New blends are required each day to compensate for the loss of solutes due to evaporation and use.

Types of water-based metal coolants:

Emulsions (also known as "emulsifiable oils") are mixtures of oils, emulsifiers and other functional additives and water, supplied to the user in the form of a concentrate. Emulsion concentrates and condensates usually contain 60%-90% oil and can be diluted with water. A typical ratio is a concentrate with 20 parts water, ie 5%. An opaque, milky appearance when mixed with water. It is commonly used as a universally applicable coolant because it can usually work with ferrous and non-ferrous metals and has many applications.

Semi-synthetic coolants are much lower than oils in emulsions. A typical concentrate contains 5%-40% i oil. When mixed with water, usually 1 part of the concentrate is mixed with 20 parts of water, that is, the concentration is 5%, and the mixture is opaque to translucent. This type of coolant is also referred to as a chemical or pre-formed chemical emulsion because the concentrate contains water and emulsion or discrete oil during the preparation process, unlike emulsion concentrates, which are only used when diluted. An emulsion is formed. These coolants are generally sufficiently slippery to be used in medium to heavy duty ranges (ie, without centering and creeping feed grinding, or turning and drilling). Its wetting and cooling properties are better than emulsions, supporting higher flow rates and feed rates ii. The fully synthetic coolant is free of mineral oil. Most synthetic coolants have a transparent appearance when mixed with water. Several fully synthetic coolants are classified as synthetic emulsions which are free of mineral oil but which exhibit an opaque emulsion when mixed with water. Fully synthetic coolants can be used in light duty (ie double-side grinding, surface grinding or milling) to heavy duty (ie creep feed grinding, threading and drilling), while synthetic emulsions perform well in very heavy duty applications. Fully synthetic coolants typically have very low foam levels, are clean and have good cooling properties, supporting high processing efficiencies and feeds, high productivity, and good product size control.

How to mix metal coolant

When blending the Heiner coolant, an emulsion is added to the water. The emulsifier suspends the oil droplets in the water and produces a stable diluted emulsion as expected. If water is added to the concentrate in reverse order, the emulsifier will release a portion of the concentrate to capture the water molecules. This produces a reverse emulsion which results in the loss of some components of the coolant such as lubricating components, bactericides and corrosion inhibiting components. Some or all of the chemical components in the coolant may be affected. The stability and concentration of the compounding are also affected by the reverse emulsion. To complete the mixing of the coolant, the concentration should be tested with a refractometer to determine if the requirements for use are met.

Mixing needs

should:

In the case of manual compounding, it is necessary to inject concentration into the water.

To increase the concentration of cooling, add the concentration directly to the well that is suitable for good mixing.

Thoroughly mix the coolant before measuring the concentration.

The concentration of the coolant was tested using a Heiner chemical refractometer.

Not

A concentrate is injected into the liquid tank, and water is poured into the concentrate.

Inject the concentrate into the configuration tank or in the pre-dispensing tank and fill the concentrate with water.

Mix the unknown concentrate in the coolant reservoir.

The concentration is controlled by visual or gross perception.

Fill the concentrate in the working area of ​​the machine and then open the nozzle to mix the concentrate.

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