CS200878B1 - Metal cutting fluid - Google Patents

Abstract

The cutting fluid for metalworking based on an aqueous solution of alkali metal nitrite contains an addition of alkali metal phosphates, preferably sodium phosphates, which have a buffering and anti-corrosion effect, namely Me^PO^ . 12 HgO in an amount of 1 to 20% by weight and MegHPO^ . 12 HgO in an amount of 0.2 to 10% by weight. Me means an alkali metal atom* The combination of both components leads to an unforeseen mutual reinforcement of the individual qualitative effects (anti-corrosion effect) and at the same time to an increase in the buffering (buffering) ability of these substances. The fluids are harmless to health, bring an economic effect and improve hygienic conditions in production and improve the environment.

Description

The conventional metalworking fluid based on an aqueous alkali nitrite solution contains the addition of both an alkali metal phosphate, preferably sodium, and a corrosion-inhibiting, preferably sodium, phosphate. 12 HgO in an amount of 1 to 20% by weight and MegHPO4. 12 HgO in an amount of 0.2 to 10% by weight.

Me means alkali metal atom *

Combination of both components leads to unforeseen mutual enhancement of individual qualitative effects (anticorrosive effect) and at the same time enhances the buffering ability of these substances. Liquids are harmless to health, bringing an economic effect and improving hygienic conditions in production and improving the environment.

200 878

200,878 (51) Int. Cl? C 10 II 1/10

200 878

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alkali metal nitrite solution, preferably sodium nitrite, in an amount of 0.1 to 2%, preferably 0.2%, at a pH of 8.0 to 9.5, optionally with the addition of emulsifiers.

The known metal cutting fluids are based on aqueous solutions of various compounds, mainly inorganic ones, which, in addition to cooling the workpiece, also protect the workpiece from corrosion and / or lubricating effect. they have anticorrosive effect even at low alkalinity (about pH 8.5) · Lubricating effect is usually provided by the addition of organic substances, such as hydrocarbons, usually in combination with emulsifiers of various types (see Bumbálek, Oštádal, Šafr: Cutting fluids, Prague SNTL 1963 , pp. 38-39) ·

[0008] The above-mentioned drawbacks are aimed at eliminating the present invention of a metal-cutting coolant, which comprises the addition of an oral or anti-corrosive alkali metal phosphate, preferably sodium phosphate, in an amount of 1 to 20 Me2 PO4 · 12 HgO. % by weight and MegHPO4, 12 HgO in an amount of 0.2 to 10% by weight, in which the general chemical formulas Me represents an alkali metal atom;

The most important advantage of the cutting fluid according to the invention is that it combines the advantages of the anti-corrosive nitrites with the phosphate buffering action, which, as is known, also has an anti-corrosive effect on iron. The result of this combination is a significant anticorrosive effect of both said anticorrosive substances as well as an anticorrosive favorable alkalinity range of the solution thus obtained.

The coolant coolant influences heat dissipation from the machining point and the tool, .5 S < _: .i SX " _Δ ί.ί * Α.Ης.βΒ reduces the friction between the tool and the workpiece and increases the cutting effect and combines the advantages of cutting. Ί in terms of lubrication effect · Chips are quickly washed away in the machining process * Kapali-Jji 01;

it is also suitable for demanding operations · The liquid has good wettability · When using the liquid, partial phosphating occurs and thus the cutting and grinding tools are protected

ÍíÍ5V knows Ísšívs “Aísixsffs! riotsssc ixilsv xxtstóxd fiabafivsit saxtsQsS OJsx cold. At the same time, the liquid has a cleaning effect. It does not foam, it is ap, r <e ^, it undergoes bacterial decomposition, so it has a long service life. The machining process prevents infection and growth of bacteria of different strains such as Esch.coli,

H 0 ' ⁵ J.? ř ⁱⁿ VT? M 0? S 1

Pseudomonas aeruginosa, Proteus vulgaris, Candida álbioans and others

They are spreading around, ,,ίοίι ^ η ^^ ,, ζ ^ ύβ ^ ίη »- jg ^ e fZííůaoMxSW ¹ 'W

Liquids are harmless to health while maintaining safety and hygiene regulations.

200

878

The cutting fluid according to the invention brings an economic effect and an improvement of hygienic conditions in the production and improvement of the environment ·

Example 1

Ia ₃ PO ₄ · 12 HgO 150 kg Ha ₂ HP0 ₄ · 12 HgO 30 kg NaN0 ₂ 3 kg etbyl-englycol 7 kg glyoerine 3 kg polyethylene glycol 7 kg methylene blue 0.002 kg water 1000 kg

The coolant prepared in this way is suitable for machining and grinding ooell and non-ferrous metals, especially in terms of smoothing effect.

Example 2

Va ₃ P0 ₄ 12 12 H ₂ 0 50 kg

Va2HP0 ₄ · 12 HgO 10 kg

KNOg 2,5 kg silicone oil with emulsifier 8 kg water 1000 kg

The fluid can be advantageously utilized in terms of both cooling and lubrication effect * Cutting resistance is significantly reduced during machining, thus enabling increased machine performance and extending tool life * Liquid exhibits particularly long tool life *

Example 3

Na ₃ P0 ₄ . 12 HgO 120 kg Na ₂ BP0 ₄ · 12 HgO 15 kg NaN0 ₂ 3 kg mineral oil e emulsifier 10 kg water 1000 kg

This liquid is suitable for machining very strong materials, especially for very demanding machining operations.

Claims (1)

OF THE INVENTION Cutting fluid for machining metals based on an aqueous solution of an alkali metal nitrite, preferably sodium nitrite, in an amount of 0.1 to 2%, preferably 0.2%, with a pH of 8.0 to 9.5, optionally with the addition of emulsifiers, characterized in that 2. The composition of claim 1, characterized in that it contains an addition of an alkali metal phosphate, preferably also an anticorrosive agent. 200,878 sodium, namely Me 2 PO 4 · 12 HgO in an amount of 1 to 20% by weight and MegHPO ^. 12 HgO in an amount of 0.2 to 10% by weight in which chemical formulas Me represents an alkali metal atom.