Metal cutting fluid testing seeks authoritative testing institutions

Authoritative testing institutions generally refer to testing laboratories that have obtained the national CMA CNAS qualification.

SCC750A stainless steel cutting fluid is made of special high-performance extreme pressure additives, rust inhibitors and other additives, which can form a stable transparent light yellow solution when mixed with water. It has good extreme pressure lubricity, rust resistance, cooling, settling and cleaning properties. It has strong anti-microbial decomposition ability and can maintain its stability under different water hardness conditions, and is a new generation of high-performance multi-purpose foam-free grinding fluid.

The test items specified in GB T 31469-2015 "Semiconductor Material Cutting Fluid" mainly include:

There are relatively few detection indicators of semiconductor material cutting fluid, and the appearance inspection indicators require colorless or yellowish transparent liquid, and the other testing items only have viscosity, density, color, pH value, water content, conductivity and other indicators.

Metal Cutting Fluid Detection:

In fact, there is also a local standard DB22 T 467-2009 "Clean Synthetic Metal Cutting Fluid" for metal cutting fluid testing, because it is not authoritative, we will not repeat it here. There are also several standards for metal detection methods, which are as follows:

SN T Cutting Fluids and Machine Tool Excreta Part 1: Determination of Phosphate Ion chromatography

SN T Cutting fluids and machine tool excreta Part 2: Determination of chlorine and bromine Ion chromatography

SN T Cutting Fluids and Machine Tool Excreta Part 3: Determination of Nitrite Ion Chromatography

SN T Cutting fluids and machine tool excreta Part 4: Determination of mercury Mercury Meter Method

The foreign testing standards for metal detection fluids also include JIS K2241-2017 "Cutting Fluid", DLA VV-C-846, C-2005 "Emulsified Oil Cutting Fluid", ASTM E2148-2011 "Standard Guide for the Use of Metal Processing or Metal Cutting Fluid Health and Safety Related Literature" and so on.

What are the items of quality inspection of cutting oil?

The main quality control indicators of cutting oil are viscosity, flash point, pour point, fat content, sulfur content, chlorine content, copper sheet corrosion, moisture, mechanical impurities, four-ball test, etc. For the determination method, please refer to the relevant test method standards, and only some items are briefly explained here. The method of determination is the copper sheet method.

The magnitude of the corrosive activity is expressed in stages, with grade 1 2 being low or inactive, and grade 3 4 being high activity. The larger the progression, the stronger the corrosive activity. Copper is very sensitive to sulfur, and this method can be used to determine whether there is a sulfur-containing extreme pressure agent in the cutting oil and the active size of the extreme pressure agent (Note:

This method cannot determine the amount of sulfur-containing agent). This item is also an important indicator for the classification of cutting oils.

The water-based cutting fluid should be diluted with water during application, and its test items can also be divided into two parts: direct determination and water addition determination. The items directly measured include storage stability, sulfur and chlorine content, non-volatile components, etc. The items to be measured after adding water include surface tension, pH value, foaming ability, rust resistance, corrosion, adaptability to paint, allowable amount of salt, antibacterial property, etc.

Most of these projects have a clear meaning.

1.Storage stability. Although the concentrate of water-based cutting fluid is homogeneous in appearance, it is actually mostly a colloidal system and contains a considerable amount of water.

After long-term storage and temperature fluctuations, if the formula is not appropriate, it is easy to produce precipitation, delamination and other phenomena, and often cannot be recovered. Therefore, this is an important test item.

2.Non-volatile components. The water-based cutting fluid concentrate contains water, and this item is used to determine its active component content.

3.Allowable amount of table salt. This test was carried out to determine whether the cutting fluid was allowed to be prepared with tap water with a high chlorine content.

4.Surface tension. In most cases, liquids with low surface tension tend to be on solid surfaces, so a significant number of people consider surface tension as a measure of the permeability of cutting fluids.

Strictly speaking, however, there is no direct correspondence between the two. Permeability is a vague concept that seems to be more closely related to wettability and fluidity (viscosity). Surface tension can be used as a judgment index for whether surfactants are added to the cutting fluid.

This is because a small amount of surfactant can drastically reduce the surface tension of water. In addition, the surface tension is not as small as possible, and too little surface tension can sometimes lead to other ***.

5.Antimicrobial test. Water-based liquid, especially emulsion, is prone to bacterial spoilage, so antibacterial ability is an important performance index, but it has not attracted attention in China in the past, and it has not been adopted as a quality index of water-based liquid.

Metal cutting fluid quality test: Cutting fluid is an industrial fluid used to cool and lubricate tools and machined parts. It is mainly used in the process of metal cutting and grinding.

With the continuous development of people's understanding of cutting fluid and the continuous enrichment of practical experience, the application range of cutting fluid is becoming more and more extensive.

Test items: pour point, viscosity, moisture, flash point, sulfur content, copper sheet corrosion, four-ball test, fat content, chlorine content, mechanical impurities, etc.

Test standard: DB22 T 467-2009 Clean Synthetic Metal Cutting Fluid GB T 31469-2015 Semiconductor Material Cutting Fluid GB T 6144-2010 Synthetic Cutting Fluid.

JB T 7453-2013 Semi-synthetic cutting fluids SN T Cutting fluids and machine tool excretions Part 1: Determination of phosphate Ion chromatography SN T Cutting fluids and machine tool excreta Part 2: Determination of chlorine and bromine Ion chromatography SN t Cutting fluids and machine tool excretion fluids Part 3:

Determination of nitrite Ion chromatography SN t Cutting fluids and machine tool excretions Part 4: Determination of mercury Mercury meter method.

If you directly observe with the naked eye without the help of any items, the quality of the cutting fluid is determined from the cutting effect, anti-rust effect, whether it smells and other items; If there is a portable measuring instrument, it can also be used; Then send it to the laboratory for testing.

Appearance density, storage safety.

Transparency pH.

Surface tension. Defoaming grade 1 gray cast iron full immersion for 24 hours.

Grade 1 gray cast iron monolithic 24 hours.

Grade 1 grey cast iron lamination for 4 hours.