SU1395145A3 - Lubricating material for hot plastic metal working - Google Patents

Abstract

Lubricant is preferably applied in an aqueous dispersion. To prevent coagulation of the solids in the aqueous dispersion on the one hand and to obtain a heat-resistant uniform lubricating film on the other hand, the high-temperature lubricant additionally contains, apart from a solid lubricant, an organic product which decomposes without residue, an inorganic additive of polyphosphate, a boron compound and an alkali metal silicate, and also an organic stabiliser.

Description

This invention relates to a metalworking lubricant.

The circuit of the invention is the twisting of the omazkah properties due to the decrease in the friction coefficient, which ensures the formation of a continuous lubricating film at the processing temperature above

, To prepare a lubricant, an inorganic additive is used, which includes (based on the additive) maso% sodium polyphosphate O, 2-98,8i an inorganic boron compound selected from the group consisting of borax, boric acid, ,, KBgOgx, zinc borate ,. .0.2-25.0i liquid sodium glass or liquid potassium glass (with a SlO content of 21-47 wt.) 1.0-99.6.

A sodium polyphosphate of the formula (NaPO.,) Where p-6-50000, preferably p-6-10000, is used in an inorganic additive in an insoluble or insoluble form.

Dp of preparation of the lubricant is also used graphite, polyethylene and organic stabilizer selected from the group including polyvinyl acetate, polyvinyl alcohol, polysaccharides, polyvinyl butyrate, polyvinyl butyral, polyacrylate, polystyrene, alkyl cellulose

It is advisable to use graphite with high purity, for example over 96%, and with an average grain size of not more than 300 microns, the best results are achieved when using graphite of 99.5% purity with an average grain size of 100 microns

The lubricant in the process of processing is used in the form of a 5-70% aqueous dispersion, the viscosity of which is at 10-30 С 500-26000 сП „

Aqueous dispersion is applied to the tool and / or on the workpiece being processed with temperatures in the range of 100-900 ° C and detected. When the dispersion touches the hot surface, the water evaporates and a film of uniform thickness is formed.

In cases where the use of a dispersion is impractical, a high-temperature lubricant can also be applied in the form of powder; for example, by dusting a tool and / or workpiece, rolling it around.

in the lubricant or through them

The high thermal stability of the lubricant, in particular the stability of lubricating films, is ensured by a high proportion of inorganic additives.

Example. A 30% dispersion of lubricant in water is prepared. In this case, the lubricant has the following composition, mAco%:

Crystalline

graphite with degree

purity 96% 54.0.

Inorganic

additive 26,0

Polyethylene18,0

Apkylcellulose2,0

The composition of inorganic additives, maSo%;

Polyphosphate

rub 42,0

(Madreleva salt)

Bura19,0

Liquid glass

rub (sic,

21 wt.%) 39.0

at the same time, the lubricant viscosity is 1900 cPo

The material shows the highest efficiency at a relatively low tool temperature range of 20-250 ° C on continuous rolling mills.

This composition is applied to the tool (e.g. mandrel).

Example 2 Preparing a 70% dispersion of a lubricant in water. The composition of the lubricant corresponds to the composition of Example 1, but using 5 mCo% zinc borate instead of borax as part of an inorganic additive (in an additive of up to 100 masD of liquid soda glass). This lubricant has a viscosity of 2,600 cPo at 20 ° C. When used on continuous rolling mills, it provides an improvement in the water resistance of the deposited layer and sticking it at 20–250 ° C.

EXAMPLE 3 Preparing a dispersion of a lubricant in water. A composition of a lubricant

wt%:

, graphite 60,8

Inorganic

additive35,3

Polyethylene3,7

Alkyl cellulose 0,2

The composition of inorganic additives, maso%:

Polyphosphate

on three

(Madreleva salt) 44.5

Bura25,0

Liquid glass

sodium (SiO

21 wt%

30.5

the lubricant viscosity at 1600 cPo

The lubricant is applied to the instrument having a temperature of 400 - by spraying until a uniform film is formed. During the processing of the workpiece, a uniform course of power consumption by rolling stands is observed, which indicates a high antifriction properties of the lubricant. The coefficient of friction is 0.043 „.

EXAMPLE 4 A composition was prepared as described in Example 3, replacing a borax with the same amount of zinc borate. Viscosity at 20 ° C — 2100 cP, friction coefficient 0.030,

The compositions of inorganic additives using various inorganic compounds of boron, liquid glass polyphosphates are given in table, 1-3, respectively

The compositions of inorganic additives (examples 1-30) are introduced into the lubricant of the following composition, wt%:

Graphite .54

Inorganic

additive26

Polyethylene18

Alkpcellulose2

Moreover, lubricants according to Examples 5-19 include an inorganic additive of compounds 1-15 (table), according to examples 20-25 - compositions 16-21 (table 2); in examples 26-34 - composition- BOB 16-21 (table, 2); in examples 26-34 - compositions 22-30 (tabLoZ).

All lubricants are treated with water to a content of 30 solids and 70 masv% of water and sprayed on the hot surface of the tool. Water evaporates and a lubricating film of uniform thickness and high adhesion is formed.

395145

All lubricants provide a low friction coefficient of 0.03-0.043. Next, lubricants are prepared.

f- with various organic stabilizers: polyvinyl acetate, polyvinyl alcohol, polysaccharides, polyvinyl butyrate, polyvinyl butyral, polyacrylate, polystyrene, and alkyl 10 cellulose

The compositions of lubricants according to examples 35-58 are given in the tablo4o

The lubricants of examples 35-58 are also treated with water with a solids content of 30 masD and sprayed into a hot tool. After the water evaporates, an effective lubricating film is formed.

In lubricants are introduced

polyphosphates (NaPO) with different values According to examples 59-62 n, respectively, equal to 6; 500; 10,000–50,000; 50,000

The inorganic additive for each example lubricant has the composition,% by mass:

Polyphosphate

(according to

value n). 44

Bura24

Liquid glass

(SiO 21%) 32

As a result, the following lubricants are obtained and tested.

0

five

composition, May:

Graphite54.

Inorganic Supplement26

Polyethylene18

Alkyl cellulose2

In these experiments, the expected effect according to the invention is also achieved, as in the previous examples,. For comparison, a composition of a known lubricant was prepared (example 63), wt.%:

Graphite54

Kremneva

acid26

Polyethylene18

Alkyl cellulose2

The lubricant is diluted with water in a high-shear mixer to a content of 30 mCo% solids.

The product is a stable slurry that is sprayed onto a hot tool. Is formed

0

firmly bonded to the film with a film of uniform thickness. Experiments with this film are unacceptable because already 2-3 wt.% Of silicic acid in a solid lubricant produces an abrasive effect on the workpiece and on the tool, and with a share of silicic acid of 26 maso%, you should be afraid of serious damage to the tool Yu and the workpiece. The coefficient of friction of this lubricant is 0.085.

13951А56

coefficient of friction about Temperature test 800 C,

As you can see, the coefficient of friction of the proposed lubricants is significantly lower than the known ones, which leads to higher lubricating properties and quality of the treated surface.

Claims (1)

Invention Formula Made as a composition (example 4), wt,%: Graphite59 Acrylic styrene copolymer19. Colloidal flint acid6 Silicate rub 13 Polysaccharide3 The coefficient of friction of the lubricant according to the example 64 0,06 The composition according to example 65, wt.%: Graphite66 Copolymer vinyl acetate31 Polysaccharide (without silicic acid) 3 The maximum value of the friction coefficient for this composition is slightly lower (perhaps as a result of the absence of silicic acid), but exceeds 0.054 „ Comparative tests are carried out by applying a film of lubricant to the sample of the mandrel. With the aid of a drive motor, the mandrel advances against the resistance pre-heated to 700-1000 With a metal block vertically directed relative to the mandrel. The values of the vertical force (for all tests, this value is taken as 10 tons) and the horizontal force can be calculated , Invention Formula Lubricant for hot metal forming, containing graphite, polyethylene and an inorganic additive, characterized in that, in order to improve lubricating properties, the lubricant as a non-organic additive contains a mixture of components based on the additive at their next ratio, maso%: Sodium polyphosphate formulas (NaPOj), 5 where p 6-500000.2-98.8 Inorganic boron compound, selected from the group including borax, 3Q boric acid,., KV., 08-4H Oh, zinc borate 0.2-25.0 Soda or liquid glass potassium glass with containing 810 21-47 wt.% 1.0-99.6 and the lubricant additionally contains an organic stabilizer selected from the group consisting of polyvinyl acetate, polyvinyl alcohol, polysaccharides, polyvinyl butyrate, polyvinyl butyral, polyacrylate, polystyrene, alkyl cellulose in the following ratio components, wt%: Graphite11.0-60.8 Polyethylene 3,7-18,4 The specified inorganic additive 5,3-35,3 The specified organic stabilizer 0,2-80,0 five 0 45 Table c) Nsorgv Icheskm Lrisadh Woura Bourne cue lot tO KV, 0, Vorat zinc o.a SodArvoes components, for example   T® JT P T T Jujii 25 - - - - 12 - - - .- 0, 1 - - 0 .2 - - - 0.1 25 -25 - 25 12 0.2 25 12 - - 12 - and Fullphosphate (Iadrsleva salt) 52.3 52.3 52.3 Y, 61, B 39 39 39 46 46 46 46 46 46 54 54 Soda glass (SiO. 2IX), 5 47.5 47.5 39 Sv 36 36 36 29 29 42 42 42 34 34 Table 2 . about 21%) 0.2 0.2 74,874,8I Woura Oopifoefat (Madrell eaa salt) Lapikov glass vatr (S10 "2IZ) Liquid glass vatrv (4P) Dust glass ka (diOt 262) eight 8a0,2 0,2 0,2 333 919t 910.2 0.2 0.2 34.5 34.5 34.5 99.6 62.5 99.6 62.5 99.6 .62.5 25 - 25 12 25 12 - - 12 - and 43 98.8-43 13232 {Table 3 99.6 62.5 99.6 62.5 99.6 .62.5 1395145 10 TableA