SU1546472A1 - Concentrated lubricant for cold-working of metals by application of pressure - Google Patents

Abstract

The invention relates to process lubricants and can be used in metallurgical production for cold metal forming, in particular during rolling and drawing ferrous and non-ferrous metals. The purpose of the invention is to increase tool life. The lubricant concentrate contains, wt.%: The cubic residue of synthetic fatty acids of 6.3-16.2

sodium salts of the cubic residue of synthetic fatty acids 15.4-17.3

Soap stock of vegetable oils 68,4-76,4. The use of a lubricant reduces the drag force by 82N and the drag voltage by 56 MPa when the brass wire is drawn. 5 tab.

Description

The invention relates to process lubricants and can be used in metallurgical production for cold metal forming, in particular during rolling and drawing ferrous and non-ferrous metals.

The purpose of the invention is to increase tool life by reducing drag forces.

The following products are used as feedstock for the preparation of lubricants:

distillation residue of synthetic fatty acid production - (SCC), OST 38.01182-80, which is a mixture of high molecular weight organic

acid fraction-Cu and above, the acid number of 70-90 mg KOH / g,

Soap stock of vegetable oils (soap and alkaline solution), TU 18 USSR 621-83, is obtained by alkaline refining of vegetable oil - sunflower according to GOST 1129-73, soybean according to GOST 7825-76 and has in its composition, May. % total fat 12.8, associated fatty acids (in the form of sodium salts) 11.1, neutral fat 1.7, alkali free (NaOH) 0.216%. moisture content 80%

Lubricants are prepared using the following technology.

SL

Yu

20

Soap stock of vegetable oils is placed in a heated tank with a stirrer, heated to 60-70 ° G, and then the calculated amount of melted bottoms FFA is loaded into the same tank and mixed vigorously. The process of neutralizing free alkali proceeds very quickly, the process is determined by measuring the pH of the obtained JQ concentrate, which should be no more than 8. The resulting concentrate is a practically odorless brown mass, the pH is diluted to a solution concentration. 15 The concentrate can be used both in the initial and diluted state. Dilution is carried out with ordinary water to a concentration5 provided for in the rolling or drawing process. The content of water in the soap stock during the preparation of the lubricant in some cases does not require its additional introduction, since the amount of water contained in the soap stock makes it easy to apply the lubricant in the form of a concentrate.

The compositions of lubricants are given in table.1. The composition of the lubricants 1-5 determined the stability, corrosivity and pH of the diluted solutions.

Stability is an indicator of the durability (separation) of an emulsion over time. The tests are carried out according to GOST. The emulsion being tested, as a rule of that concentration, which is used during rolling or drawing ()) is poured into a cylinder in an amount of 100 ml and left to stand at room temperature (20 + 5 ° C) for the time required by the standard or specification on the tested lubricant. After a set time has elapsed, the amount of oil (ml) released on the emulsion surface is determined. The formation of a concentrated emulsion in the form of cream in the upper layer while maintaining the homogeneity of the remaining emulsion is taken as the absence of emulsion separation.

Corrosion aggressiveness is determined visually according to GOST. An emulsion is considered aggressive if, after A h aging, a darkening occurs on the t gray iron plate according to GOST under a cap of 55 lei emulsion. The results of testing the compositions of lubricants () are given in Table 2.

The effectiveness of the compositions was evaluated by analyzing the effect of the lubricant on the stretch ratio and the advance with constant installation.

thirty

35

40

45

50

when rolling mill rolls.

The stretch ratio is determined by the formula

by

where 10 and 1, is the length of the sample, respectively, before and after rolling.

The more ju, the more effective technological lubricant.

For the experimental determination of advance, the method of core prints is usually used. It means that using a core or other tool, marks (risks) are made on the surface of the roll, the distance between which is measured. After rolling, the distance between the respective imprints on the surface of the strip is measured. The lead is calculated by the formula

1n It

where is 1.

U distance between risks on

roll;

fingerprint spacing

on the strip.

The emulsion applied to the rollers and the strip reduces the coefficient of friction during rolling, therefore, the bands rolled with more effective lubrication have a greater stretch, a smaller thickness and lead time than the bands rolled with less effective lubrication.

Antifriction properties of the lubricant is evaluated by the coefficient of friction. The effectiveness of the lubricants is evaluated by the pressure of the metal on the rolls. It should be borne in mind that the higher the coefficient of friction, the greater the pressure force.

For the pilot rolling, specimens of an Obkp steel of size 1.5 x 30 x 500 mm were used. Rolling conducted on the mill 200 at a speed of 0.9 m / s. First, samples were rolled on dry rolls, i.e. without applying lubricant to the rolls and strip, and then with the flow of experimental compositions in the form of 5% emulsions to the rolls and strip.

The effectiveness of the compositions was evaluated by analyzing the effect of the lubricant on the stretch ratio and the advance with constant installation.

when rolling mill rolls.

The stretch ratio is determined by the formula

by

where 10 and 1, is the length of the sample, respectively, before and after rolling.

The more ju, the more effective technological lubricant.

For the experimental determination of advance, the method of core prints is usually used. It means that using a core or other tool, marks (risks) are made on the surface of the roll, the distance between which is measured. After rolling, the distance between the respective imprints on the surface of the strip is measured. The lead is calculated by the formula

1n It

where is 1.

U distance between risks on

roll;

fingerprint spacing

on the strip.

five

0

five

0

The emulsion applied to the rollers and the strip reduces the coefficient of friction during rolling, therefore, the bands rolled with more effective lubrication have a greater stretch, a smaller thickness and lead time than the bands rolled with less effective lubrication.

Antifriction properties of the lubricant is evaluated by the coefficient of friction. The effectiveness of the lubricants is evaluated by the pressure of the metal on the rolls. It should be borne in mind that the higher the coefficient of friction, the greater the pressure force.

For the pilot rolling, specimens of an Obkp steel of size 1.5 x 30 x 500 mm were used. Rolling conducted on the mill 200 at a speed of 0.9 m / s. First, samples were rolled on dry rolls, i.e. without applying lubricant to the rolls and strip, and then with the flow of experimental compositions in the form of 5% emulsions to the rolls and strip.

51

The averaged measurement results are shown in Table. 3

The effectiveness of the formulations prepared was also assessed by the change in the drag force. If wire drawing is carried out under the same conditions (same workpiece material, drawing tool, strain rate, etc.) with different lubricants, then the lubricant providing the minimum drag force has the best anti-friction properties. The drawing was carried out on a UMM-5 type tensile machine, imitating a single-drawing mill, at a speed of 100 mm / min. Brass 70-mm-diameter brass wire with a diameter of 1, and L 69 brass wire with a diameter of 6.22 mm were chosen as blanks.

As a working tool

porcelain made of hard alloy type VK-6. Technological lubrication, falling into the deformation zone (die channel), improves the conditions of contact friction, thereby reducing the frictional force, strength, and consequently, the dragging voltage.

726

L-69 - in table. 5 (data in table. 5 are given for 5% emulsions of lubricants). The application of the proposed lubricant when drawing brass-plated wire reduces the drag force by 82 N and the pull voltage by 56 IPa; when brass wire is drawn, the drag force is reduced by 838 H, the draw voltage is 40 MPa.

Claims (1)

Formula from found and Lubricant concentrate for cold pressure treatment of metals, containing the soap stock of vegetable oils, which is characterized by the fact that, in order to increase tool durability, the concentrate additionally contains the vat residue of synthetic fatty acids and sodium salts of the vat residue of synthetic fatty acids in the following ratio components, May. %: Cube synthetic fatty acids6,, 2 Sodium salt vat residue synthetic