SU1188195A1 - Lubricant for abrasive machining of metals - Google Patents

Abstract

LUBRICANTS FOR ABRASIVE TREATMENT OF METALS containing sulfur, molybdenum disilecans, mineral oil, polyisobutylene and stearic acid, characterized in that (e, in order to increase the durability of the abrasive tool, the lubricant additionally contains sodium sludge in the following ratio of components, wt.%: H 2 sodium 15-20 sulfur 20-25 molybdenum diselenide 10-15 mineral oil 2-3 polyisobutylene 0.5-1.0 stearic acid the rest

Description

00 X

with The invention relates to mechanical engineering, in particular to lubricants for the abrasive treatment of metals used in dry grinding of tools and grinding of parts, mainly from high-speed, tool and nitrided steels. The purpose of the invention is to increase the cost of an abrasive tool. The introduction of sodium nitrite into the composition of coolant (coolant. It is justified only to increase the lubricating properties of liquids. However, the lubricating properties of sodium nitrite can manifest themselves in the temperature range up to. Use of coolant containing nitrite , for machining operations with blade tools, the contact temperature of which exceeds 300 ° C, is impractical due to increased wear of the cutting tool caused by chemical interaction Sodium nitrite decomposition product with a tool material. In the proposed lubricant, sodium nitrite performs the function of a chemically active substance. Decomposition of sodium nitrite in the grinding zone at contact temperatures exceeding 300 ° C causes the oxidation processes of the juvenile surface of the material being processed with the participation of acid nitrite sodium. The formation of brittle oxide films on the surface of the metal and the walls of the microcracks of its destruction reduces the energy required for dispersion metal, and prevent adhesion. The lubricant of the proposed composition is made in the form of cylindrical briquettes. All the other components are placed in a melt of stearic acid, the temperature of which is 75 ° C, and after thorough mixing the mixture is poured into molds, where it hardens. The following components were used in the preparation of the lubricant; technical grade GOST 127-76, molybdenum diselenide TU 89-26-78, steric acid (stearin) GOST 6484-64, high molecular weight polyisobutylene GOST 13303-67, mineral oil (spindle) GOST 1642-75, sodium nitrite GOST 19906- 74. 52 In the formulations used is polyisobutylene P118, molecular weight 100.000-134.000. The following lubricant formulations were prepared (Table 1). For comparison, a known lubricant was prepared (composition 10), wt%: Sulfur 40.0 Molybdenum diselenide 10.0 Mineral oil 3.0 Polyisobutylene1.0 Stearic acid - Up to 100. . Conducted an assessment of the roughness of the treated surface and the stability of the circle when using lubricants compositions 1-10. A quantitative assessment of the durability of the wheel was made by the weight of the ground metal for the period without a burning operation of the wheel, i.e. during processing between his edits. The occurrence of prizhogi on the treated surface was determined visually by the color of tint. The roughness of the treated surface was measured across the processing marks on a Caliber-201 profilograph profilometer. The circle was edited with a diamond in a frame in the following mode: a circle speed of 35 m / s, a feed transverse to T, 7 m / min, a depth of 0.01 mm. The experiments were carried out with a flat mortise grinding of samples of steel grade R6M5, HRC62, dimensions 10x50 mm, abrasive circle PP 200x X16x32 24A40PSM17K5 in the following modes: 35 m / s, V, 10 m / min t 0.01-0.02 mm / dv. move The test results are shown in Table. 2. As a result of the tests (Table 2) it was established that the greatest resistance of the wheel is provided when coatings 2-4 are applied to its working surface. The surface roughness is reduced by 1 bit compared with the use of a known lubricant. The increase in the content of stearic acid due to the extreme decrease in the concentration of the components of the lubricant filler (composition 1) causes a decrease in the durability of the wheel and an increase in the roughness. The lower limit of stearic acid content is 36 May. % due to lubricant manufacturing technology. For lubricants containing less than 36 May,% of the binder component, the distribution of filler powders in the volume of the lubricant briquette turns out to be non-uniform, which causes a deterioration of 95.4. the operational and mechanical properties of the lubricant (part 5). An extreme increase in the concentrations of sulfur, molybdenum diselenide and sodium nitrite in comparison with the use of compositions 2-4 does not give new qualitative results (compositions 6.7.9). Ta blitz 1

0.92 1.28

t, U

-

2.00

1.52 2.08

table 2

0.38 0.48

0.30 0.4

0.30 0.38

1.52 2.08

1.48 2.00

1.44 2.00

1.20 1.60

1.36 1.84

0.84 1.12

note Numerator -, 01 mm / two-way,

Continued table. 2

0.29 0.38

0.31 0.400, 29 0.38

0.40 0.45

0.35

0.44

.0,38 0,44

the denominator — t 0.02 mm / two-way, —the experiment was not conducted due to the unsatisfactory quality of the lubricant briquette.

Claims (1)

GREASING FOR ABRASIVE METAL PROCESSING, containing sulfur, molybdenum dialenide, mineral oil, polyisobutylene and stearic acid, characterized in that, in order to increase the resistance of the abrasive tool, the lubricant additionally contains sodium nitrite in the following ratio ponents, wt.%: Sodium nitride 15-20 Sulfur 20-25 Diselenide molybdenum 10-15 Mineral oil 2-3 Polyisobutylene 0.5-1.0 Stearin <g acid Rest ω I