Page 11 - Dycert_Havryluk

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of friction coefficient curves for LCLs and LCLr in the range of 100 ... 1000 N

characterizes the lubricating ability stability of the new LCL. The total wear on the

cutting path S = 1000 m with LCLo emulsion is 5 g and with LCLs emulsion - 7.86 g. It

is established that 3% LCLs emulsion provides 1.5 times larder wear than LCLo.

The drilling speed was determined by drilling of 12Kh18АG18Sh steel under axial

load 150 N. The optimal range of cutting speeds for high strength steels with new LCLs

is 1.3 times higher, and comparing with to dry cutting - by 2.8 times. At the same time

the stability of a tool increases by 1.6 times. When chemical composition of LCLo is

changed to LCLs or LCLr at 3% concentration the duration of 38KhN3МFА steel

samples drilling increases by 60%, while under turning value of tool wear decreases

accordingly by 2 times. The results of LCL tribological investigations correlate with

electrochemical and adsorption measurements data.

Scientific novelty of the obtained results.

The composition of new environmentally friendly LCLs with increased

anticorrosion effect, providing the protection of parts and equipment during the
interoperate period after machining of high strength steels is proposed and

substantiated. The reaction of transesterification of triglycerides with triethanolamine
and the double bonding with monoethanolamine of sunflower and rapeseed oils

increased anticorrosion and lubricity of LCLs on their basis.
The rational concentrate content in the working fluid (3 wt.%) was established on

the basis of electrochemical and tribological investigations of new LCL. It was found
that in LCL on the basis of sunflower and rapeseed oils, compared with mineralized

water, the corrosion rate of 38KhN3МFА steel reduces by an order of magnitude and its

degree of corrosion protection exceeds 90%. It is shown that in the new LCL

38KhN3МFА steel corrosion proceeds at anode control and after mechanical processing

passivates.

The mechanism of proposed LCL action, which consists in LCL chemosorption

on the steel surface after machining, is revealed. The LCLs (LCLr) adhesion for

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38KhN3МFА steel is 63.6 ∙ 10 (63.9 ∙ 10 ) N/m, which is less than ~ 1.7 times in
comparison with mineralized water (110.4 ∙ 10 N/m).
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