SU924090A1 - Cutting fluid for metal machining - Google Patents

Description

The invention relates to lubricant-cooling liquids (coolant) used for the mechanical processing of metals, in particular for honing and superfinishing of products from ferrous metals.

Coolants are known for machining ⁵ metals with an abrasive tool, which are emulsions, aqueous solutions, various oils with the addition of additives [1].

However, these coolants do not meet the increased requirements for finishing processes ^{10 of} abrasive metal processing, do not provide the required quality of the machined surfaces and the necessary working conditions of workers.

Also known is a coolant based on water, carbon- ^{, 5} acidic sodium, sodium nitrite, a dicalium salt of a diester of a mixture of alkenyl succinic octaglycerides, a tetrasodium salt of Ν-octadecyl-Ν-sulfosuccinoyl asparaginic. acid (asparal F), sodium salt of carooxymethyl- ²⁰ cellulose, triethanolamine (2).

However, this coolant is also not effective enough when grinding products.

Closest to the proposed is a cutting fluid for machining metals (3), having the following composition, wt.%:

Sodium Nitrite Triethanolamine

0.2-0.5

0.4-1.2

Sodium carbonate 0.3-0.5

Asparal F 1-3

Disodium salt of alkylpolyoxyethylene glycopeic ester of sulphonic acid 0.4-1

Water Else

However, the known coolant insufficient effectiveness ₄ tively protects the surface from mutual adhesion. During diamond honing of cast iron and steel, processing wastes are deposited on the bars, they are salted, which leads to damage to the tool and the appearance of scoring on the treated surface.

The purpose of the invention is improving the quality of the processed surface and reducing the consumption of diamond-abrasive tools.

This goal is achieved by the fact that С0Ж7 for machining metals, containing water, sodium nitrite, sodium carbonate, asparal F and sodium salt of sulfosuccinic acid ester, as the last one contains 5 gig sodium salt of di-2-ethylhexyl sulfosuccinic acid ester (succinol 2 K) with the following content of components, wt.%:

Nitrite, sodium 0.2-0.6 Sodium carbonate 0.3-0.5 Asparal F 1.0-3.0 Succinol 2K 0.4-0.6 Water Rest Succinol 2K (di-2-ethylhex- sodium salt

sulfonosuccinic acid ester) has the following formula:

No. Cu ^ soo-cn ^ -sn-hsk ^ -si ^ cn- CO0-CI ^ -CH- (C ^ -CH3 ⁷⁾ The presence of the group 8Ο ₃ Νβ in the molecules of asparal F and succinol 2K gives the liquid a high load-bearing capacity.

The proposed coolant has high wetting, detergents, good emulsifying ability, does not lose its properties when oil gets into its composition from the lubrication system of the machine, does not form deposits of salts and hard-to-remove films on the working surfaces of the equipment and processed products.

The proposed coolant is prepared by dissolving all components in water at any temperature. The result is a homogeneous, light yellow liquid, ready for use.

In coolant formulations 1-6, the surface tension at the liquid-gas interface and the contact angle of wetting of the liquid are determined, (in this case, the surface of steel ШХХ15)

In the table. 1 shows the compositions of the proposed and known liquids; in table 2 - physicochemical parameters; ·

Table!

Coolant components Composition Proposed Famous 1 2 3 4 5 6 Sodium nitrite 0.2 0.4 0.6 0.2 0.35 0.5 Triethanolamine - ' - - 0.4 0.8 1,2 Sodium carbonate 0.3 0.4 0.5 03 0.4 0.5 Asparal F 1,0 2.0 3.0 1,0 2.0 3.0

Sulfo alkylpolyoxyethylene glycol ether disodium salt

succinic acid - -. - 0.4 ’ 0.7 1,0 Sodium salt of di-2-ethyl hexyl ester of sulfosuccinic acid 0.4 0.5 0.6 Water 98.1 96.7 95.3 97.7 ’95.75 93 ,:

Τ ·> blitz 2

Coolant Surface tension, n / m Wetting angle ^ deg Famous 34-32 20-18 Proposed 30-28 14-12

As can be seen from the table. 2, the proposed coolant has better spreadability and penetration, which is very important when processing the bars.

Machine tests of the known and proposed coolant are carried out during superfinishing of 40X steel with BP grinding stones

924090 6

60x20x40 63СМ14МЗКЛ according to GOST 2156-75. Processing mode: workpiece rotation speed 5.5 m / min, vibrational motion speed 5 m / min, sweep-oscillation Зх10 “ ^э , machine time 60 s.

The obtained data when testing the coolant are presented in table. 3.

Table 3

g- Composition of coolant Productivity, mm ” ³ / min Bar Consumption, mm ” ³ / min . Roughness, microns 4 115 12,2 0.123 5 118 11.8 0.125 6 P6 11.5 0.119 1 125 11.6 0.118 2 122 113 0.115 3 124 11.3 0.113

As can be seen from the table. 3 when superfinishing with the proposed coolant obtained higher processing rates, increased productivity by 5-10% and reduced consumption of bars in the same range.

These coolants are tested on a mod honing machine. 3821 when machining cast iron midrange

21-40. Processing is carried out by ASR 100/80 — M73-100 bars. Processing mode: hone rotation speed 40 m / min; reciprocating speed 10 m / min; feed for cutting 0.5 μm / dv. stroke, machine time 60 s.

The data obtained when testing the coolant during honing are presented in table. 4.

Table 4

3 $

Composition of coolant Productivity, g / cm ² Bar Consumption, mg / g Roughness, microns 1 0,097 0.0065 1,64 2 OD 15 0.0053 1,60 3 0.118 0.0056 1,57 4 0,081 0.0092 1.75 5 0,084 0.0087 1.72 6 0,085 0.0086 1.70

As can be seen from the table. 4 when honing, processing productivity increases by 10-30%, the consumption of bars decreases by 25-45% with a slight difference in surface roughness.

Thus, the application of the proposed

Coolant provides the required process performance and durability of diamond bars, roughness of processed products. When processing with the proposed coolant is reduced by 8

Sodium nitrite 0.2-0.6

Sodium carbonate 0.3-0.5

Tetrasodium salt

Ν-octadecyl-Ν-sulfosuccinoyl aspartic acid p 1.0-3.0

Sodium salt of di-2-ethylhexyl ether sulfosuccinic acid 0.4-0.6

Water Else

Sources of information taken into account during the examination

1. Kurchik Η. N. et al. Lubricants for metal cutting. M., Chemistry ”, 1972, p. 124-127.

2. USSR copyright certificate on the application Ν® 2726783/04, cl. S 10 M 3/02, 1979.

3. USSR author's certificate No. 816149, cl. C 10 M 3/02, 1979 (prototype).

* heating of the sleeves, increasing the accuracy of processing and improving working conditions.

Claims (1)

Form ul inventions $ Lubricating fluid for mechanical processing of metals containing water, sodium nitrite, sodium carbonate, Ν-octadecyl-Ν-sulfosuccine-> 0 silaspartic acid tetrasodium salt, and sulfonic acid ester sodium salt, characterized in that, in order to reduce the consumption of diamond abrasive tool and improving the quality of the surface to be treated, 15 liquid as the sodium salt of the sulfonic acid ester contains the sodium salt of di-2-ethylhexyl sulfonic succinic ester with the following content nents, wt.%: M