SU1203103A1 - Lubricant for dry drawing of metals - Google Patents

Description

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The invention relates to the processing of metals by pressure, in particular, to technological lubricant for dry wire drawing, of stainless and carbon steels.

The aim of the invention is to provide stable mechanical properties of the wire and reduce the drag force.

The content in the lubricant of the kerosene shale gene improves its technological properties. The combined introduction of shale kerogen and low and / or high pressure polyethylene provides for the transition of a lubricant from an elastic-plastic state to an plastic one and then to a fluid at a temperature in the deformation zone due to a decrease in the dropping temperature of 180-200 ° C and low wetting angle (30 -40 degrees) All this provides a more uniform supply of lubricant to the deformation zone, stabilizes the dragging process, which makes it possible to increase the speed of dragging, reduce scrapes and, ultimately, increase tool life. Introduction of 0s5% polyethylene does not give a tangible effect: in the initial period of dragging the content of the lower melting component, and in this lubricant it is polyethylene. Testing the wire drawing on dual draw wires with a shale kerogen content of 20% showed that before entering the metal in the nap dies molecular polyethylene is melted and caking occurs grease mass, which greatly deteriorates the lubrication and seizure conditions voloche- audio. The introduction of polyethylene in the form of a powder with a dispersion of from 1 μm to 5 mm is due to the dispersity of the other components of the lubricant: liquid powder and kerogen. If the powder is codispersible chalk - up to 400 microns, this facilitates the process in the initial period of drawing: fine particles are more easily carried by the wire to the deformation zone. At steady state, large particles of powder (250-400 µm) of polyethylene are also involved in the drawing process. Casa smiling heated

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, 40 - 45 g

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locks, they are fused and co-deposited on its surface. At the same time, polyethylene consumption is reduced.

On the other hand, large particles of the powder promote better mixing of the lubricant, since the three-component lubricant in the pulping, where the wire is constantly moving along its center, somewhat resembles a centrifuge, where the components with lower specific gravity are located at the top, and heavier at the bottom. The specific weight of soap powder is 0.9 g / cm, kerog-. on slate of 1.35 g / cm, polyethylene

15 0.92-0.93 g / cm. With coarse granular powder, no centrifuging effect is observed. A soap powder, which contains mainly sodium stearates, is taken for the preparation of a lubricant. - Content of fatty acids, including unwashed fat and organic unlabeled substances, in a mass of powder up to 86 wt.% Iodine number 65, so pl. 210 ° C.

Kerogen shale, high-pressure polyethylene (LDPE) with a density of 0.92 g / cm mol. mass 22000 and low pressure polyethylene (HDPE) with a density of 0.94 g / cm, mole, mass 2.10.

The lubricant is prepared in a stirrer container, the axis of which is mounted on a rotating shaft, where the calculated amount of soap powders, keeogrogen shale, polyethylene is poured. The container is hermetically sealed and the mixture is stirred for 20-30 minutes, after which the lubricant is ready to fall asleep in the soap dish of the drawing mill.

4Q At a wire drawing machine at a 1/350 metal lab, with a measure of the force of drawing and strength along the routes, a known lubricant and variants of the proposed lubricant are tested. private reductions of 15-25%, with a total reduction of up to 90% when drawing steel 65С2ВА along the route: 2.45-2.2-1.95- 1.74-1.55-1.43-1.3-, 17-1.01-0.9- 0.8 mm ..

The tests were carried out according to accuracy class II. The tensile strength in the workpiece 300 MPa. The test results are shown in the table.

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As can be seen from the table, the effort is at -80 m / min), at the Grün camp (transfer speed at crossings at the proposed 250 m / min) along the following routes my lubrication is lower than at the known one. for caladium steel grades: 65C2BA-IJ- Offered lubricants provide 10.3-9.5-9.0 mm; 51HFA-7.0-6.2 - stable mechanical properties of 5 5.2 mm pro; 12X18H10T-7.0-6.0 mm: A12-die 6.5-5.5-4.6-4.0 mm.

It also carries out tests at wills. Results of wire dragging on mills 1/750 (of course, the lubricant grips well with the growth of 750 m / min), 1/650 (speed, pitting, scratching, no scratches.

Claims (1)

Lubricant for dry drawing of metals, containing soap powder and oil shale kerogen, characterized in that, in order to ensure stable mechanical properties of the wire and reduce drawing forces, the lubricant additionally contains high and / or low pressure polyethylene in the following ratio, wt.%: Kerogen slate 10-90 High and / or low pressure polyethylene 0.5-20.0 Soap powder The rest is about