SU863623A1 - Cutting fluid for mechanical working of metals - Google Patents

Description

(54) LUBRICATING LIQUID

FOR MECHANICAL WEDDING OF METALS The invention relates to the machining of metals, in particular to metalworking with a diamond abrasive tool, and can be used in enterprises producing high-precision products. Known aqueous compositions of cutting fluids (coolant) for abrasive treatment of metals, containing electrolyte solutions and surfactants 1, are known. However, such aqueous coolants form salt deposits on the working parts of equipment, cause corrosion of ferrous and non-ferrous metals, do not meet the requirements to the quality of processed products. During abrasive machining, the use of these coolant lubricants leads to intensive wear of the grinding and tool and a reduction in the surface roughness class of the treated parts. Coolant based on water, sodium nitrite and sugar 2 is also known. However, this coolant has insufficient protective properties and low bearing capacity, which leads to premature clogging of the abrasive tool, increasing friction and cutting power in the contact zone of the tool and part. This reduces the efficiency of the treatment process. Closest to the invention in terms of composition and the result achieved is a coolant containing water, sodium nitrite and soda ash 3. However, this fluid has a low bearing capacity, which causes a rise in torque, jamming of the tool and its breakage. The quality of the surface to be treated does not meet the requirements. The purpose of the invention is to increase the productivity of the machining process and tool life. To achieve this goal, the coolant for machining metals, containing water, sodium nitrite and soda ash, additionally contains caprolactam with the following content of components, wt.%: 0.5-2.0 Caprolactam 0.15-0.3 Nitrite sodium calcined 0,15-0,3 the rest

In the preparation of coolant, all components are dissolved in the required amount of water.

Table 1 shows the prepared coolant compositions.

These coolant compositions 1-6 are tested when honing bushings made of cast iron SCH 21-40 with a diameter of 24 mm and a length of 100 mm on a machine model 3821. The proposed coolant containing

Test modes: caprolactam, has a whiter high

The rotational speed bearing capacity compared to

rpm 560 known, lower carrying capacity The speed of which verticality causes an increase

supply, m / min 10 twisting moment, jamming of inRadial sub-tool and its breakage,

bars, µm / two-digit code 1tf The proposed coolant provides such an assessment of the effectiveness of liquids and higher efficiency is produced by comparing the cryotsent when honing cast iron SCh 21 m m: removal of metal, specific wear 40 and on average 5-10% higher than

diamond layer, roughness obra-compared with the well-known on all shown surface.

Content, wt.%, In compositions. |

Components G „- I

Suggested Famous

- - - - - - - -. - - - - - - - - - - -. - - - -

123 4 5 ".1-.1L111 - :: ode calcined 0, 15 0.20 0.30 0.05 0.20 0.30 0.30

Sodium nitrite 0.15 0, @ 0 0.30 0.15 0.15 0.20 0.30

Caprolactam 0.50 1.00 2.00

Water; 99.20 98.60 97.40 99.70 99.60 99.40

soy-1 Removal Specific i-j Roughness of tava I metal, nose of diamond 1 surface, micron g / min layer, mg / g

The results of the tests of the coolant are presented in table 2.

Thus, comparative tests of cooling liquids demonstrate the advantages of the proposed coolant compared to the known.

Table 1.

40Table2

0.084

1.7.8 0.096 18.9 0.091 16.9 0.176 14.5 0.186 15.8)}

Vc} In the process of testing with this coolant, the torque value rises above the critical value, which causes a breakdown of the cold trap and the cessation of experience.

1.68 1.57 1.63 1.79 1.75)

Claims (3)

1. Kurchik N.N. and others. Lubricants for metal cutting. M., Himi, 1972, p.127-131. 2. Authors certificate of the USSR 389127, cl. C 10 M 1/06., 1973. 3. Lubricating and cooling technological tools used for cutting metals at metal cutting, Sat, M, TsNIITELegpishchemash, 1U73, s, 11 (prototype).