SU727672A1 - Lubricant for hot pressing of nonferrous metals and their alloys - Google Patents

Description

/ 54 / LUBRICANTS FOR HOT PLASTIC COLORED METALS.

J The present invention relates to the field of process lubricants for the hot working of metals by pressure and can be used in the processes of hot pressing, stamping, rolling and reducing non-ferrous metals and alloys. .

In the process of hot deformation of metals, water-based lubricants containing graphite, clay, borax, sodium metasilinkate, etc. are used. Other additives fl.

A lubricant containing molybdenum disulfide and graphite 2 may also be used.

The use of the above lubricants is associated with the difficulties of their application during the hot working of metals by pressure.

Lubricants for the hot treatment of metals based on sodium tripolyphosphate with the addition of solid fillers, salt eutectics of various compositions and oil fractions are known / 3-5 /

AND THEIR ALLOYS

Mii properties. The use of a solid fine powder as a stabilizer pump further impairs their anti-friction properties.

The closest in composition is a lubricant for the hot treatment of metals based on water, sodium tripolyphosphate, graphite, and the product of saponification of fatty acid distillation tars isolated from vegetable oils or technical fat / 6 /.

However, this lubricant is not effective enough when hot pressing of articles from non-ferrous metals and their alloys, for example, from copper and brass, since the high melting point of the salt component, a well-known lubricant entering into it, leads to a hardening of the lubricant, deterioration of the antifriction properties and a decrease in the surface quality of the finished products.

to work grease in the direction of. low temperatures.

The goal is achieved by the fact that the lubricant for hot treatment me-; tally based on water, sodium tripolyphosphate, graphite, and the product of tarry oil from fatty acid distillation. , isolated from vegetable oils or technical fat (tar oil soaps) / additionally contains mixed sodium and potassium subphosphate 1p 1 ratio of sodium: potassium equal to 2: .. The composition of the lubricant in Wei "%

0.2-20. Sodium tripolyphosphate mixed sodium polyphosphate

0.2–20 and potassium 2–10

Tartar Soaps 2-10 Graphite

up to 100. Water

Sodium tripolyphosphate forms a stable antifriction film on the metal surface.

Studies of salt systems based on sodium and potassium polyphosphates have established that the lowest melting point among those studied has a mixed sodium and potassium polyphosphate, with a weight ratio of

/ Ja: K 2: I. The minimum peak of the melting effect of the mixed sodium polyphosphate, potassium is about 540 ° C, which is 100 ° lower than the melting point of sodium tripolyphosphate and 300 ° C lower than the melting point of potassium tripolyphosphate.

Considering that sodium and potassium e-caped polyphosphate is active against a range of metals, including non-ferrous metals, it has the properties to form viscous melts, it has a relatively low melting point. Name of content of components

it is advisable to use as a salt component of technological lubricant for the process of hot pressing non-ferrous metals.

As a solid antifriction filler, graphite is introduced into the lubricant which improves the antifriction and shielding properties of the lubricant and is widely used as a solid filler for process lubricants.

As a stabilizer in the proposed lubricant, we use tar soaps, which are products of saponification obtained from the distillation of fatty acids of tars isolated from vegetable oils or technical fat.

The complex phase composition of tars allows to obtain multifunctional -,. .- .. ... . . -. , - -.

stabilizer, which, in addition to the main function, in some cases plays the role of an additional lubricant.

Moreover, the properties of the M05KNO salt lubricant should be adjusted in accordance with the requirements of the process by varying the depth of sludge duster.

The lubricant is prepared by mixing the components at a temperature of 4090 ° C. The ratio and concentration of the components may vary depending on

- -. -. ...- ,. , .fji-T -TwrysfKr.

from the conditions of the deformation process and the requirements for the finished product m.

The lubricant can be applied manually directly on the presses / hot pressing / or immersing a heated tool or workpiece / hot rolling a / into the lubricating bath.

The following are examples of lubricant compositions for hot deformation of metals / table 1 /. /

Table 1 of components, in wt.%

Sodium and potassium polyphosphate

The proposed lubricants were tested in comparison with the known following sos1ana / weight,% /:. .

16 2 2 8 8

Born Trine Polyphosphate, Pochash Acid Graphite

Tar soaps

Up to 100 Water

Alloy pipes / VOC extruded on a 1500 ton hydraulic press. The test results are given in tabjjue 2.

As can be seen from the table, the proposed lubrication / FS-4 / provides, in the process of hot pressing, a reduction in the pressing forces compared with the prototype and an improvement in the surface quality of GoIaiiix products.

table 2

: ,,.

Efforts of the press-class Pure Lubrication, t on top. Thus, the use of FS-4 nq pre-lubricating lubricants nq compared to the existing ones improves the antifriction properties of the lubricants, allows CiiH3HTb energy parameters of the hot-pressing process, and improves the surface quality of the good products.

Claims (6)

1. US patent number 3801504, cl. From 01 M 3/04, published. 1974. 2.Patent of France No. 2195675, cl. C 10 M 3/02, published. 1974. 3. USSR author's certificate number 499291, cl. C 10 M 7/02, 1974. 4. USSR Author's Certificate No. 454246 Cl. C 10 M 7/02, 1973., 5.ABjopcKoe Saidel USSR, No. 505674, cl. C 10 M 3/02, 1974. 6. USSR author's certificate number 5668,69, cl. C YuM 7/02, 1975 / prototype /.