SU1407953A1 - Grease for machining metals - Google Patents

Abstract

The invention relates to lubricating compositions (SC) for the machining of metals, in particular for the machining of parts from high-temperature alloys and steels. The goal is to increase the durability of the cutting tool and the quality of the processed surface. The composition of the SC includes, May.%: Sulfur 25-35, polytetrafluoroethylene 0-30, potassium silicate 10-15, stearic acid the rest. This compound enhances antifriction and anti-edging properties during machining, especially when milling grooves. 2 tab.

Description

about ate

00

This invention relates to lubricants used for machining meta. tl, in particular when processing parts from hot-melt alloys; B and i; that lei s

The aim of the invention is to increase the durability of the cutting tool of the quality of the treated surface.

Ll of grease contact with sulfur, polytetrafluoroethylene, potassium silicate and stearic acid.

Polytetrafluoroethylene is one of the carboxylic i-cationic polymers of: troenium. During the processing, it forms strong boundary films that are resistant to abrasion at high temperatures in the treatment zone. However, these films have insufficient adhesion to metal.

Potassium silicate is introduced as a component that improves the adhesion of the resulting film to the metal, which prevents chips from sticking to the cutter surface.

Sweeping of antifriction and proton-hardening properties during mechanical processing, especially when milling manholes, with the use of lubricant, is ensured by the formation of: by sulphide and slug films, which are resistant to abrasion at high temperatures}.

The npo; jeci e handling is hard to work

ib, B3i; ibix high alloys and alloys at high temperatures, steric acid decomposes into a series of high molecular weight monohydric alcohols and higher fatty acids, which, when interacting with sulfur, form sulfurous salts of fatty acids, which have properties to absorb the surface energy of the material being processed reduction of cutting forces and reduction of scuffed material properties.

The proposed lubricant composition was prepared as follows.

Stearic acid is melted at 85 ° C, powdered poitaetrafluoroethylene, m.p. 80 ° C. A mixture of OH.PA / C is given in air to 60-65 ° C and, with}} continuous mixing, jisiioi potassium silicate and sulfur are added. The resulting mixture is set on thermovibrate: for 10 minutes (while maintaining a stable temperature of 60-65 C), and the drip is poured into metal molds; |; s S

50

five

0

five

Q

five

The compositions of lubricants are given in table.1.

The degree of effectiveness of each lubricant composition is evaluated by determining the durability of disk mills and the quality of processing. Milling is subjected to groove surfaces with a depth of 5 mm, a diameter of 6 mm and a length of 45 mm in blanks of heat-resistant alloy ZhS-6K and steel 38XC.

Tool durability is determined by the cutter operation time until the wear on the back surface of 0.5 mm and by the size of the burr that occurs at the transition of the surface to be machined and not to be machined.

As a cutting tool, disc mills with a diameter of 110 mm and a width of 6 mm, made of steel R9K5 with a hardness of HRC 63-65, are tested.

The geometrical parameters of the cutting part of the disk milling cutter are the following, degrees: rake angle 10; rear angle 15; tilt angle 10; lateral rear angle 1.5-2.

The processing is carried out on a horizontal milling machine in the following modes: for ZhS-6K alloy, speed 10 m / min, B 0.03 mm / tooth, S d, 22 mm / min, depth 5 mm; for steel 38XC, the speed is 25 m / min, S 2. 0.03 mm / tooth, Bina 5 mm.

Lubrication is applied to the cutting part of the tool after each groove has been machined.

The tests are carried out in comparison with the known lubricant (composition 8), wt.%:

Sulfur 35

Diselenide

molybdenum15

Mineral oil 2.5

Polyisobutyl 0.75

Stearinova

acid 100

The test results are shown in table 2.

When milling grooves in blanks from ZS-bK alloy, when using the proposed lubricant, the durability of the milling cutters compared to the known lubricant increases 1.4 times, and from 38XC steel - 1.3 times. The durability is determined when the cutter is worn on the back surface to 0, 5 mm. At the same time, the burr value in the processing of the ZhS-6K alloy is in the range of 0.3-0.4 mm, and in the processing of the ZVHS steel, 0.7-0.9 mm.

S d 52 mm / min, glu314079534

Thus, with the use of the cutting of solid lubricant for milling heat tools and the quality of hard-to-work material surface with the purpose of increasing the durability, the lubricant as fishing gear increases the resistance of disk mills with minimal burrs after processing, which reduces the laboriousness of parts manufacturing.

polymeric additive contains polytetrafluoroethylene and additionally potassium dihydrate in the following ratio of components, masd:

in order to improve the cutting tool durability and the quality of the machined surface, lubrication

polymer additive contains a policy to ensure the durability of the cutting tool and the quality of the treated surface, lubrication as

tetrafluoroethylene and additionally potassium sydicate in the following ratio of components, masd:

Claims (1)

Invention Formula A lubricant for the machining of metals, containing stearic acid, sulfur and a polymer additive, 15 characterized in that. Components The content of components, wt.%, In the composition ... J..L.Li..L.L.L..J ... J. 15 20 25 30 35 40 45 Sulfur Polytetrafluoroethylene Potassium silicate Stearic acid 10 15 20 ten 25 thirty 12.5 15 35 18 40 20 Up to 100 Up to 100 Up to 100 Up to 100 Up to 100 Up to 100 Up to 100 Sulfur Polytetrafluoride Silicate Kali Stearinova acid 25-35 20-30 10-15 Remaining Table 1 25 thirty 35 40 ten 12.5 15 18 20 table 2