SU1214740A1 - Lubricating for mechanical metal working - Google Patents

Description

 . 1214740

The invention relates to lubricants for the machining of metals, used to increase the anti-friction and anti-wear properties of cutting tools and, in particular, drills when machining parts from structural, alloyed and chromium-nickel stainless steels.

The purpose of the invention is to increase 2

An increase in the antifriction properties during mechanical processing (drilling) with the use of this lubricant is provided by the formation of boundary films of sulfides and oxides resistant to abrasion, possessing high chemical stability and satisfactory mechanical properties under conditions of high contact

cutting tool bones and power and temperature, processing duration by increasing Lubrication is obtained by following the anti-friction and extreme pressure properties under conditions of high contact

zom.

Stearic acid is melted and ceresin, molybdenum disulfide and molybdenum diselenide are successively introduced into the resulting melt. The mixture is cooled to 60-65 ° C and sodium silicate and sulfur are added with continuous stirring. The resulting mixture is poured into metal molds for cooling.

loads and temperatures.

Molybdenum disulfide is introduced as an antifriction additive to reduce the temperature in the treatment zone. Ceresin has good lubricating properties and increases the ability of the boundary film to resist high loads and high temperatures. Sodium silicate is introduced as a film-forming binder, which prevents the chips from welding to the tool surface and increases the temperature performance of the lubricant, which is especially important for creating friction conditions during machining.

The degree of effectiveness of each composition of solid lubricant was estimated by comparing the tool life when drilling holes in nickel-chromium-stainless workpieces. X18P9T steel and structural steel 40X.

2

An increase in the antifriction properties during mechanical processing (drilling) with the use of this lubricant is provided by the formation of boundary films of sulfides and oxides resistant to abrasion, possessing high chemical stability and satisfactory mechanical properties under conditions of high contact

loads and temperatures; Lubricants are obtained as follows:

loads and temperatures; Lubricants are obtained as follows:

zom.

Stearic acid is melted and ceresin, molybdenum disulfide and molybdenum diselenide are successively introduced into the resulting melt. The mixture is cooled to 60-65 ° C and sodium silicate and sulfur are added with continuous stirring. The resulting mixture is poured into metal molds for cooling.

The following components were used to manufacture the lubricant: molybdenum disulfide CMTU No. 06-1-68, ceresin TU 7658-74, technical sulfur GOST 127-76, molybdenum diselenide TU 89-26-78, sodium silicate TU 130- 79-81, stearic acid GOST 6484-64.

The composition of the lubricants is presented in Table 1.

The durability of the drills was determined by the number of drilled holes until the drill was completely worn out. The lubricant formulations (1-5) were tested in comparison with the known lubricant (6). For wear criteria, the drill face was taken to be worn at the rear face of 0.6 mm.

As a cutting tool, standard twist drills (GOST 19544-74) made of high-speed steel P6M5 (aRC 63-65) were tested (diameter 9.5 mm. The processing was carried out on a vertical drilling machine mod. 2A170, sharpening the drills was carried out on a universal - grinding machine mod. ZA64D with a 24A25CM1K5 bowl wheel.

The lubricant was applied to the cutting part of the tool after each hole was drilled while the drill was being withdrawn from the part.

The processing mode of stainless steel X18H9T: cutting speed of 20 m / min, feed 0.14 mm / rev, depth 15 mm; structural steel cutting speed of 30 m / min, feed 0.2 mm / rev, depth 20 mm.

The results of determining the resistance of drills for all compositions of the lubricants studied are given in Table. 2. The result- | Tata testing the performance of the optimal composition of solid lubricants are given in Table. 3

ITABLE2

Number of drilled holes, pcs

one

Steel H18N9T

Steel 40X

13 18 26

15 20 32

Compiled by T. Salamova Editor I. Segl nick Tehred S. Migunova Proofreader M. Maksimishin ec

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Order 857/38 Circulation 483 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Continuation of table 2

Number of drilled holes, pcs

Steel Х18Н9Т I Steel 40Х

ten

4 5

23 19

28 21

Famous 15 th

12

sixteen

20

.Table 3

As can be seen from the table. 2 and 3, when drilling a hole in a billet of steel X18H9T using the proposed formulations, the resistance of the drills is increased 1.3 times as compared with the use of a known lubricant. When machining 40H steel, resistance increased 1.2 times. The surface roughness does not change.

Claims (1)

LUBRICANT FOR MECHANICAL PROCESSING OF METALS, containing sulfur, molybdenum disylene and stearic acid, characterized in that, in order to increase the resistance of the cutting tool and processing performance, the lubricant additionally contains molybdenum disulfide, ceresin and sodium silicate in the following ratio, May. %: Sulfur 10-15 Molybdenum Diselenide 3-5 Molybdenum disulfide 20-25 Ceresin 8-12 Sodium silicate 8-12 Stearic acid Rest SU ,, 1214740