The effect of GOST R 50558-93 applies to all types of lubricating coolants (COOLANT), the State standard of the Russian Federation GOST R 50558-93 was introduced on 01.01.1994.
General technical requirements This standard applies to all types of lubricants (coolants) that are used at the stage of processing parts by cutting processes, and also sets standards for the purity of coolant during transportation, storage, mixing, use and disposal.
The main requirements of paragraphs 1.1, 1.3, 1.3.1, 1.3.2 are mandatory, the rest are recommended.
1.
Standards for the purity of COOLANT during transportation, storage, mixing, use and disposal.
1.1 Transportation and storage of hydrocarbon-type COOLANT, as well as the initial components for mixtures to be diluted with water, must comply with GOST 1510.
1.2 At the stage of mixing and preparation of coolant (dilution with water), in the process of preparing for the application of hydrocarbon coolant, all measures must be taken to exclude various contaminants from entering the coolant (Appendix 1 contains a list of terms).
1.3 The coolant used in cutting operations must comply with the purity indicators specified in the technological documentation for a particular part production process.
1.3.1 Sampling to determine the degree of contamination of coolant is carried out after cleaning the latter in the pressure line for supplying liquid to the machine using a sampler or at the stage of removal from the nozzle (supplies coolant to the cutting area).
The quantity and volume of the sample are indicated in Appendix No. 2 - No. 4.
1.3.2 The purity of coolant can be described when evaluating the following values: - the average value of the particle parameter d, microns (Appendix 3); - the degree of concentration of mechanical impurities C, g/dm3: 1.
for those that are to be mixed with water - according to Appendix 2; 2.
for hydrocarbons - according to GOST 6370 or GOST 26378.2; - standard deviation of particle parameters σ, µm (Appendix 3); - percentage of non-emulsified oils in coolant to be mixed with water (Appendix 4); - points of fungal resistance, bacteriostability, according to GOST 9.085.
1.3.3 If there are no special requirements for the technological process of processing the workpiece, then the coolant purity indicators should be within the values specified in Table 1.
Table 1.
Boundary values of indicators of purity of lubricating and cooling mixtures during operation Type of mechanical processing Indicators of purity of coolant * C, g/dm3 d, µm σ, µm Cm**, % 1.
Round external grinding: preliminary 0.4 30 8 1 final 0.1 5 1.5 0.5 2.
Flat grinding: preliminary 0.3 20 6 1 final 0.04 3 1 0.5 3.
Turning: preliminary 0.5 100 50 1 final 0.3 20 30 1 4.
Drilling 0.4 50 20 1 5.
Countersink 0.3 15 10 1 6.
Deployment 0,1 10 5 1 * The value of points, according to GOST 9.085.
** For coolant to be mixed with water.
1.3.4 The boundary values of coolant purity, which are used in individual systems of application in production with a wide range, are determined by the part in the processing of which coolant with a purity index of an order of magnitude higher is used.
1.3.5 The boundary values of coolant purity used in centralized systems are determined by the process, which shows the use of COOLANT with a higher purity index.
1.4 The purity indicators of hydrocarbon coolants, which are subject to delivery to enterprises processing similar substances, must comply with GOST 21046.
1.5 The purity values of the coolant to be mixed with water, which are supplied to the recycling (regeneration) plants, should not be higher than the limit values shown in Table 2.
Table 2 Boundary values of the purity of coolant to be mixed with water Coolant purity index Coolant decomposition method Reagent Evaporative Membrane 1.
The mass concentration of mechanical impurities C, g / dm3, not more than 1.5 0.3 0.1 2.
The content of foreign oils Cm, %, not more than 4.5 1.5 1.5 * During the delivery of spent coolant, limit values should be provided according to the table at the COOLANT consumer enterprise.
09 Martha 2017
