SU941408A1 - Process lubricant for metal press-working - Google Patents

Description

one

The invention relates to the production of mineral oils for the lubrication of rolls, tape and strip in the processing of metals by multi-roll rolling mills.

These oils are necessary for lubrication of the rolling stock and rolls of rolling mills, where the economic feasibility of using special oils is dictated by an increase in the quality of rolled products, a decrease in roll wear, oil pollution and an improvement in the processes of degreasing and filterability. Such oils can be used in the production of belts and strips on rolling mills from both non-ferrous and precision alloys.

The main requirements for oils of a similar purpose are the improvement of the quality of rolled products and its properties, high lubricity, good antioxidant, anti-corrosion, anti-wear, anti-foam and viscosity properties, the possibility of using an automatic lubrication system for rolls and tapes.

A lubricating oil is known for lubricating rollers and ribbons from non-ferrous and precision alloys, which is a mixture of diesel fuel of DS and oleic acid 1 type.

The disadvantage of this composition is increased roll wear.

It is known to use as a lubricant for cold working of coriander oil 2.

The disadvantage of using this oil is the scarcity and complexity of its production technology, i.e. The oil is additionally subjected to hydration, refining and deodorization in order to obtain high purity of the rolled surface, which requires additional costs for its production.

Known lubricant for cold and warm treatment of metals, 39, contained and mineral oil, EH and s. Scale of additives for improving lubricant, anti-corrosion and anti-oxidant properties 3 Lack of lubricant composition 1; And there is instability of the emulsion during storage and npki which adversely affects the lubricity of the composition, and the complexity leads to the complexity of its preparation and high cost. The closest in composition to the offer is process oil for cold metal processing, containing mineral millo, zinc dialkyldithiophosphate, + -methyl-2, 6-di-tert-butylphenol, trans-isomerized vegetable lasla i / L phosphoric acid tributyl ether. The disadvantage of this oil is that A drift of the HG powder filter to the surface to be treated is observed, due to which the oil properties and the quality of the surface to be treated deteriorate. The purpose of the invention is to improve the anti-wear properties of the oil and improve the desiccation of the surface of the treated metal. The goal is achieved by the fact that technological oil for cold treatment of metals with a mixture containing mineral siacno, dialkyldithiophosphate of zinc and -methyl-2, 6 di-tert-butylphenol, additionally contains ether of pentaerythritol and synthetic fatty acids (FFA) of the Cg-Cg fraction at the following ratio of kO |. components, May. / o: Dialkyl dithiophosphate zinc, 5 4 - Methyl-2, 6-di-tert-butylphenol 0,) - 0.7 Ester of pentaerythritol and systhetic fatty acids of C.IJ-CQ1-2 fraction Mineral oil Else Pentzerythritol is introduced to provide optimal friction conditions between the driven strip and work rolls, between the driven and 1-thick supporting rolls, in order to improve the magnetic properties of the rolled metal and improve filterability, due; Zinc dialkyldithiophosphate provides anti-seize, anti-wear and anti-corrosion properties; 4-methyl-2, 6-di-tert-butylphenol (ion) provides thermo-oxidative stability as in the process of operation1 .and | .-. current I-: at a, litteg; l.1; - wound f-icjia. 3 As a mineral base, it is preferable to use a deeply refined oil, which consists of 8 (5; methanoneaphthenic hydrocarbons with a minimum aromatics content (not more than 2.0 mg s.%), Which, 8 excess, significantly affects the quality of the metal for the worse. The maspo has at least 95 and kinematic viscosity cSt at 50 ° C, a narrow fractional composition (IC 280 C, kK), while providing the necessary viscosity properties, the cooling capacity of the oil and the normal annealing process. The oil is prepared by mixing the components used for 40-60 minutes, the composition of the samples of process oil is given in gabl 1. The physicochemical properties of the oils are presented in table 2. Table 3 shows the operational properties of the proposed (samples 1) and known oils Sample 4 was prepared on transformer oil with the addition of transisomerized refined vegetable oil 1.0%, dialkyldithiophosphate zinc 1.5% s tributyl ether of phosphoric acid 2.5% and -meti L-2, 6-di-tert-butylphenol 0.3 % Test by ODA The filterability and filtration rate are carried out on a model filter using a powder filter — zeolite 535, in comparison with the known composition. Comparative tests of samples of technical oil were carried out on the Kaarto 200 mill on rolls with a diameter of 26 mm with a speed of 0.2 m / s; the calculation of the rolling friction coefficient is calculated using the combined Akelund-Druden formula. According to GOST 9 60--75 (spe,; q tests k h, speed of 1400 per minute, load 20 kg), the antiwear properties of the samples are determined. Industrial tests of the proposed Mysl are carried out on a twenty-shaft KOBOM rolling mill in comparison with the known. Comparative performance data of oils are presented in Table. . During the tests (table t) it was found that when applied to a twenty-roll mill of known composition, a stable water emulsion appears in the lubrication system, the presence of which is negative for fine filters and mill bearings. These phenomena are due to the fact that, with the formation of a stable aqueous emulsion, a jelly-like substance appears, which adsorbs on the surface of the filter adsorbent and prevents oil filtration, thereby increasing the pressure in the filter, ground consumption and significantly increasing the pollution after the rolling. In addition, the increased contamination of the oil causes increased wear of the bearings of the support rolls of the rolling mill. The formation in oil of a known composition of a stable water emulsion and a gel-like product is facilitated by the presence of transisomerized refined vegetable oil in oil. When testing the proposed composition of such phenomena is not detected. The operational tests of the known composition of the oil show that the oil is characterized by lower lubricating properties and filterability, contamination of the metal as compared with the proposed oil. When testing, there is a large instability of tensions and speed conditions, for the proposed composition, the rolling speed is higher than that of the known composition, which is explained by its better cooling lubricant properties. The fat content and contamination of the strip after rolling on the oil of the proposed composition is much less than on oil of a known composition. The parameters characterizing the operation of the filtration process are the oil pressure in the filter and the specific flow rate of the earth per ton of rolled metal, which is determined by the cyclical nature of the filter, i.e. time from flushing the earth on the filter plugs to shedding the waste earth when the pressure on the filter rises to 1.2 atm. The data table. k show that the pressure in the filter and the specific consumption of earth when the mill is working on the oil of the proposed composition are respectively lower, and the filter operation with the oil of the proposed composition is characterized by a much greater stability. The quality of products is higher. After annealing, the metal surface is bright and clean. When working on oil of known composition, cases of clogging of the filtration system (filters) are not excluded, as a result of which there are no claims / cases when the filtering powder gets on the rolls and strip and increases bearing wear and deterioration of the strip surface quality. The presence of a stable aqueous emulsion also adversely affects the operation of bearings and rolls. Table 1

Zinc dialkyldithiophosphate

-Methyl-2, 6-di-tert-butylphenol

Ether pentaerythritol and SLC fraction Se-Sp

Mineral oil

2.0

2.5 0.6

0.7

2.0 To 100 To 100

Kinematic viscosity, cSt

Flash point in open crucible, С

Acid number, mg KOH / g Coking ability,% Ash content,%

Content of mechanical impurities

The content of water-soluble acids and alkalis

Corrosion plates Art. +0 3 hours

Filtration rate at l / min

Pressure in the fine filter, atm

Friction coefficient

Oil temperature after testing, C

Thermal resistance by differential thermal analysis (decomposition temperature), C

The surface roughness of the tape Ra, km

Anti-wear properties (diameter of spot wear), mm

table 2

5.7 5.7

7.2

holds

18.0 18.5

0, 0.6

,five

Table 3

0.069 0.065 0.066

0.077

tO

40

0

228

236

22.8 235

0.20

Do not form

0.60

0.36 O, 0.37

to

9 "1 08

Table C

Claims (1)

Process oil for cold pressure treatment of metals, containing mineral oil, zinc dialkyldithiophosphate and 4-methyl-2,6-di-tert-butylphenol, characterized in that, in order to improve the antiwear properties of the oil and improve the degreasing of the surface of the metal, oil additionally contains the ester of pentaerythritol and synthetic fatty acids fraction C ^ -Cd in the following ratio, wt.%: Dialkyldithiophosphate zinc 1.5-2.5 4-Methyl-2,6-di-tert-butylphenol 0.5-0.7 Pentaerythritol ester and synthetic fatty acids C ^ -Cd 1-2 fractions Mineral oil Rest