RU2355744C1 - Concentrate of lubricant-cooling liquid for mechanical treatment of metals - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to concentrates of ecological water-soluble lubrication-cooling liquids, provided for metals mechanical treatment. Nature: concentrate contains in wt %: glycerol 77, isopropyl alcohol 5, copper complex of Trilon B and Trilon B 2, soda ash 0.5, boric acid 0.25, water 15.25. In preference copper complex of Trilon B and Trilon B 2 contains in weight relation 1:1.

EFFECT: cutter power increasing, ability of dilution of the concentrate by water of any rigidity, absence of special recovery during the discharge of spent lubrication-cooling liquid into sewage system.

2 cl, 1 tbl

Description

The invention relates to concentrates of cutting fluids (coolant) and can be used in various industries of the metal industry to increase the durability of metal cutting tools.

There are various concentrates for the preparation of aqueous emulsions and solutions, consisting of oils, inorganic and organic compounds, surface-active substances (surfactants), etc. [1-3].

The most environmentally friendly are oil-free water-soluble coolants. These include Modos cutting fluids (TU 2422-003-76664814-2005) (based on ethylene glycol and triethanolamine); “K-1” (TU 0258-001-53511781-2001) (based on salts of fatty acids); “MGD-11” (TU 10RF561-90) (based on saponified tar from distillation of fatty acids), etc.

However, the resistance of metal-cutting tools when using such SOTS remains not high enough. In addition, to dilute their concentrates, it is necessary to use water of general hardness 2-7 mEq. / L at a pH of 5.2-7.0, which significantly reduces the cost-effectiveness of their use (in connection with the preparation of water) or the breadth of application.

More promising are coolant concentrates that implement a selective transfer regime in the cutting zone.

Such highly effective coolants include a water-based coolant prepared on the basis of a concentrate containing surfactants (saponified tar), as well as salicylalanilinate or copper acetate (Cu ²⁺ ion donors) and salicylalaniline (surface complex ligand) in a weight ratio of 1: 1 and 1.5 : 1 for copper acetate [4].

However, the resistance of the instruments when using this fluid is still not high enough. At the same time, high water requirements are maintained when the concentrate is diluted, there is insufficient ecological purity of the spent emulsion (aniline derivatives and surfactants) and instability of the working solution during storage (hydrolysis of copper compounds with the formation of precipitation).

The aim of the present invention is to increase the durability of a metal cutting tool, the full provision of environmental cleanliness and stability during storage of coolant and its concentrate, as well as the possibility of diluting the concentrate with water of any hardness.

This goal is achieved in that the concentrate of cutting fluid for machining metals includes:

a) glycerol CH ₂ OH-CHOH-CH ₂ OH mixed with isopropanol CH ₃ -CHOH-CH ₃ , providing the required fluid viscosity and good lubricating effect, having a sufficiently high adhesion to the metal, having comparable tribological properties, well soluble in water and well washable from the surface of parts and the machine; non-toxic, non-volatile, without an unpleasant odor and harmful effects on the skin and mucous membranes of the human body;

b) a water-soluble complex of copper (II) with Trilon B Cu [Na (OOCH ₂ C) ₂ N (CH ₂ ) ₂ N (CCH ₂ COO) ₂ Na], which ensures the presence of copper (II) ions due to thermal dissociation cutting zone;

c) Trilon B Na, H (OOCH ₂ C) ₂ N (CH ₂ ) ₂ N (CCH ₂ COO) ₂ H, Na, not bound in a complex, to soften tap water;

d) boric acid H ₃ BO ₃ , which provides bactericidal properties, which is soluble in water (table) and alcohols, in particular, this refers to glycerin with which it is able to form a compound in an aqueous medium;

e) soda ash Na ₂ CO ₃ · 10H ₂ O, which provides an anti-corrosive effect, is environmentally friendly, is approved for use in households to soften water, remove scale and as a corrosion inhibitor in heating systems, while it does not have an unpleasant odor that is irritating skin and toxic action, non-allergen, readily soluble in water, easily washed off surfaces and prevents the development of putrefactive microflora due to the creation of a slightly alkaline environment;

f) water - for intensification of cooling, since it has a high heat capacity (specific heat of water 4.2 kJ / kg × K) and heat of vaporization (specific heat of evaporation of water at 100 ° C is 2258 kJ / kg),

at the following content of components, weight%:

1) glycerin - 77

2) isopropanol - 5

3) copper complex trilon B and trilon B - 2

4) soda ash - 0: 5

5) boric acid - 0.25

6) water - 15.25

The technology for the preparation of coolant concentrate per 1 kg is as follows: dissolve with small heating copper sulfate 5 g in 50 g 50 ml of water, add this solution in 770 g (610 ml) of glycerol and add Trilon B * (* Half Trilon B in the concentrate remains unbound in the copper complex) (10 g), mix well until completely dissolved, dissolve boric acid (2.5 g) and soda ash (5 g) in 50 g (63 ml), then add the resulting mixture to the glycerin solution, mix, and add in small portions concentrated NaOH solution until reaching a pH of 9-9.5 (control on universal indicator paper).

For industrial use, the concentrate is delivered ready-made, always in a plastic container, since the presence of copper salts does not allow the concentrate to be stored in iron barrels. The concentrate is diluted with 1: 9 tap water.

Coolant testing on the basis of the proposed concentrate was carried out with steel turning by 45 cutters equipped with non-turning T15K6 trihedral carbide inserts on a model 1K625 screw-cutting lathe with the following modes: cutting depth t = 0.5 mm, feed S = 0.43 ^mm / _oh , cutting speed

V = 204.6 ^m / _min ). The working time of the cutters was 20 minutes. Coolant was supplied to the cutting zone at a flow rate of 5 l / min. The concentrate was diluted with tap water with a hardness of 11 mEq. The spent coolant is environmentally safe, as it contains substances that are acceptable for discharge into the sewer, and does not require additional cleaning. The results of persistent tests are shown in table 1. The amount of wear was measured on a large BIM-21 instrumental microscope.

Information sources

1. Lubricating and cooling technological means for metal cutting. Directory. / Under the total. ed. Entelisa S.G. - M.: Mechanical Engineering, 1995 .-- 496 p.

2. Handbook. An Engineering Journal No. 6 (111). - M., 2006. - 64 p. - Modern coolant and their application in the processing of metal blanks by cutting. / L.V. Khudobin. - 111-16.

3. Zlotnikov I.I. Water soluble soap silicate based coolant. / I.I. Zlotnikov, M.I. Zubritsky, S.F. Silitsky, N.F. Solovey, A.B. Kozlov // Friction and wear. - 2006. - T.27, No. 4. - S. 417-421.

4. Concentrate of cutting fluid for machining metals. / A.S. Kuzharov, V.A. Kokhanovsky, G.P. Barchan and others // A.S. USSR No. 727674, C10M 3/28, C10M 3/188, 04.15.80, B.I. No. 14.

Test 10% coolant based on the proposed concentrate (t = 0.5 mm, S = 0.43 ^mm / _rev , V = 204.6 ^m / _min ) No. p / p The composition of the concentrate, wt.% Average wear on the rear face, mm Note Glycerol Trilon B Copper Complex and Trilon B Isopropanol one 40 2 5 0.642 2 77 2 5 0.579 3 90 2 5 0.716 cooling deteriorates four 77 one 5 0.670 hard water, sediment not applicable 5 77 3 5 0.580 consumption increases 6 77 2 2 0.620 the solubility of the components is reduced 7 77 2 8 0.692 cooling deteriorates 8 Prototype 0.643

Claims (2)

1. Concentrate of cutting fluid for machining metals, characterized in that it contains, wt.%:
glycerol 77 isopropanol 5 Trilon B copper complex and Trilon B 2 soda ash 0.5 boric acid 0.25 water 15.25 2. The concentrate according to claim 1, characterized in that it contains a copper complex of Trilon B and Trilon B in a weight ratio of 1: 1.