SU1214743A1 - Lubricant for cold drawing of metals - Google Patents

Description

one

The invention relates to process lubricants for metal forming and can be used, in particular, in flow lines during cold drawing of carbon steel pipes.

The purpose of the invention is to increase the anti-friction and anti-seize properties of lubricants.

In the preparation of lubricants as higher fatty acids, it is advisable to use the bottoms of synthetic fatty acids (FFA) TU 38-10754-74, oleic acid TU 6-09-2739-73, which when saponified with triethanolamine MRTU 6-02-403-64 form the corresponding mrs. Phosphoric acid GOST 10678-76, phosphoric anhydride TU 6-08-163-70 were also used and any vegetable oil after hardening of parts, in particular cotton, sunflower oil, can be used as used vegetable oil.

and others. In the proposed lubricants cotton oil is used after the opera-. hardening.

Table 1 shows the physico-chemical characteristics of the original and used cottonseed oil.

The presence of the triethanolamine mixture of higher fatty acids in the lubricant leads to high antifriction properties. The presence of phosphoric acid and phosphoric anhydrire, and in lubrication leads to the formation of a sub-lubricant coating on the surface of the deformable metal and to the splitting of the rubbing surfaces of the pipe and tool, improves the anti-seizure properties of the lubricant.

Used vegetable oil is a surfactant and contributes to the activation of the lubricating medium in the deformation zone.

The proposed lubricant is prepared as follows.

16 bottoms of LF, 3% oleic acid and 1.75% triethanolamine are poured into the heated tank, thoroughly mixed and heated to 180-190 C. In another tank, pour 10% phosphoric acid, and then in small portions at Continuously stirring the acid with 3% phosphoric anhydride. Used vegetable oil, in particular, hlop32

Forged, heated to 200 ° C and kept at this temperature for 1 hour.

Then triethanolamine soap and cottonseed oil are poured into one container at 90-190 ° C and after cooling the composition to 80-90 s, phosphoric acid with phosphoric anhydride is poured. The resulting composition is thoroughly mixed and after 2-3 hours the lubricant is ready for use.

Table 2 shows lubricant compositions.

For comparison, the proposed and known lubricants were applied to a carbon steel strip (steel 10), which was drawn with a reduction rate of 21%. The effectiveness of different lubricant compositions were compared in terms of the coefficient of friction and dragging forces determined on an MT testing machine. -1 (anti-friction properties), according to the state of the surface of the deformed strip - to the presence of defects and cleanliness class (pro-wear properties),

A purity ICnacc (Ra) was determined on a profilometer profilometer. In this case, for each of the variants of lubricants 10 tests were carried out.

The results of the average tests are given in table. 3.

As can be seen from the table. 3 the proposed lubricant composition (1, 2 and 3) in contrast to

known (6), having lower friction coefficients and 5 dragging, has higher anti-friction properties.

When deforming, there are no defects on the surface of the products that are traces of metal sticking to the tool, and the purity class is higher, which indicates a higher protostage properties of the proposed lubricant. In addition, the proposed lubricant easily fade when heat-treated pipes.

The use of lubricant composition (4) with a lower content of components and

lubricants (5) with a high content of components did not provide sufficient antifriction and extreme pressure properties (the coefficient of friction is higher, the process of

flows with trembling, breakage of strips and sticking of metal to the instrument, as a result of which the efforts (dragging) sharply increase.

For comparison, the proposed and known lubricants were tested under industrial conditions with alignment and mandrel drawing of pipes made of 10-20 steel.

The drawing was carried out along the following routes: 22x4.5 mm - 19x4 mm, 15x3.2 mm - 12x2.9 mm, 10x2.7 mm - 7x2.5 mm.

The proposed lubricant contains 7 thousand meters of pipes. When drawing pipes on a known lubricant,

T a b l and 1

Cottonseed oil

Indicator

OriginalWorked up

h

Density, 918-0,9320,950-0,963

The saponification number, mgKOH / g 191-199158-166.

Iodine number100-12088-91

 / Viscosity, cSt100-120420-500

".

table 2

Number Composition of lubrication, wt.1

grease

Amino-Phosphoric Phosphoric Triethanol- Spent paraffin acid anhydride amine cottonseed oil

soap greasy

acids

i

1 2 3 4 5 6

80

 9 10 11 8 12 20

metal sticking to the tool, breakage of heads, trembling. The dragging force was 5 tons, the cleanliness of the pipe surface after dragging corresponded to a roughness of 0.63 microns. When pipes were drawn on the proposed lubricant, there was no sticking of metal to the tool, the drag forces were within 3.5–2.5 t, the surface finish of the finished pipes corresponded to a roughness of 0.16 µm.

18 20 22 17 23

71 67 63 74 60

The drawing is stable.

Strip strip (2, 3 and 7 pcs. Respectively in lubricants 4, 5 and 6).

Editor I. Segl nick

Sostayntel T. Salamova

Tech |) ed S.Migunova Corrector S. Cherni

Order 857/38

Circulation 483

VNIIPI USSR State Committee

on affairs of inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

Table 3

Subscription

Claims (1)

Lubricant for cold metal drawing containing phosphoric acid and a nitrogen-containing organic compound, characterized in that, in order to increase the antifriction and extreme pressure properties, the lubricant contains triethanolamine soap of higher fatty acids and additionally phosphorus anhydrous oil as the nitrogen-containing organic compound. ratio of components, i ^ ac.%: Higher fatty acid triethanolamine soap Phosphoric acid Phosphoric anhydride Spent vegetable oil 18-22 9-11 2-4 Rest SU-, 1214743