SLL «SPE «Bimetal»
_______________________________________
02068, Kyiv, str. A. Akhmatova, house. 3, ap. 89, EDRPOU 39676999,
Tin 396769926598, p/p number 26008300878841 in the "State savings bank of
Ukraine», MFO 322669.
Powder metallurgy is one of the most progressive technological processes of
production of composites with desired tribological properties.
At the present time powder metallurgy achieved high results in the production
of antifriction materials for sliding bearings. Opportunities in the creation of
compositions of composite materials (the possibility of introducing in the
composition of non-metallic components) allow obtaining materials with high
tribological properties (low friction coefficient, high wear resistance), the receipt
of which traditional methods are not possible.
Production of powder parts occurs on traditional technology: preparation of
raw materials (grind to get necessary granulometric composition)-dosage-mixingpressing-sintering. In this process of pressing phase there are serious restrictions
on the dimensions of the product (area pressing and height). For removal of these
restrictions the specialists of our company developed and mastered the
technology, as well as selected composition for manufacturing bimetal composite
which allows production of bearings without any restrictions on the geometrical
dimensions of the bearing.
Bimetal is a steel sheet (of required thickness) placing with a layer of
antifriction composite (of required thickness) and required dimensions, which is
used for the manufacture of bimetallic Inserts of bearings sliding.
Bimetal bearing sliding this is a unit assembly consisting of a steel chassis into
which are pressed bimetallic liners. A method of producing and composition of
composite bimetal is protected by patents of Ukraine (№ 40101 А; № 40102 А;
№ 73868).
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The bimetal is a made by our developed and approved technical conditions
ТУ У 28.7-34249896-001:2006
The composite material has the following characteristics:
1. Allowable surface pressure – 150 kg/cm2
2. Hardness – 90 HB
3. Coefficient of friction with no lubrication – 0,03-0,04
with lubrication – 0,005-0,007
4. Increased wear resistance (higher than Bronze and Babbitt from 5 times to
several orders of magnitude, depending in the modes and conditions of
operation)
The use of bimetallic sliding bearings allows to:
1. To increase the reliability working of the components and mechanisms
(material is capable of continuous working without lubrication).
2. Extend the life of units and mechanisms (due to the high wear resistance).
3. To improve the energy performance of components and mechanisms
(reducing energy costs) – due to the lower coefficient friction (increase
efficiency).
4. Significantly (ten or more times) reduce the consumption of non-ferrous
metals and alloys in the manufacture of bearings sliding.
In May 2003 in the U. S. the city of Campbell in laboratory tribological studies
were conducted comparative tests of bimetal with bronze and Babbitt, on the
basis of which the certificate was issued. These laboratory studies were confirmed
by a lifetime test and manufacturing tests, which showed high, wear resistance
(more than 40 times) greater than the wear resistance of the conventionally used
materials. Data obtained during the tests summarized in table no. 1.
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Table No. 1
Setting
P,
Mpa
(V),
mm/s
10
Material A
Grease
T,
o
C
Coeff.
friction
1
-
25
0,187
10
100
-
25
10
10000
-
25
10
1
+
25
10
100
+
25
10
10
10000
100
+
+
25
100
0,20,38
0,250,4
0,127
0,090,1
0,018
0,13
10
100
+
200
0,13
1
100
-
25
1
10000
-
25
1
100
+
25
0,1
100
-
25
0,1
10000
-
25
0,20,88
0,150,35
0,087
0,30,25
0,50,33
Wear
µm/km
Material b
Coeff.
friction
Wear
µm/km
0,16
8-10
16
0,220,33
0,240,144
0,126
20
35
Bronze 544
Wear
µm/km
0,28
13к
0,250,47
0,163
8к-12к
1000
0,250,4
0,14
0,008
35
0,11
0,130,075
80
0,09
10
0,01
7
0,5
2
0,015
0,127
5
4
0,02
0,18
0,10,134
3
40
25
2
0,250,18
3-5
0,2-0,6
275
3
0,26
2
0,2-0,6
210
1,5
3
0,047
0,310,22
0,350,2
1,2
1,2
0,015
0,250,6
0,320,55
Coeff.
friction
Wear
µm/km
10к
7
0,13
Babbitt
Coeff.
friction
0,20,37
20-25к
4000
110
3
85
Application of bimetal bearings is possible not only when replacing bearings
made of traditionally used materials but also when replacing rolling bearings
working in hard mode (the scanty supply of lubricant, high temperature, shock)
when sliding speeds of up to 10 m/s, inclusive.
From October 2007 on railroad, according to orders, ЦВ УЗ No. 00050/ЦВ,
from Wednesday, 03 October 2007 on route 1 Rokovataia-Uzhgorod-Košice was
experienced wagon No. 66227018 with the bimetallic bearings sliding in nodes
pâtnikovye.
According to the Act of Commission examination from 24.06.2010 g.
experienced wagon passed 202.5 thous. km, with dimensions of pyatnik and
podpyanyik, as well as bearing sliding remained virtually unchanged.
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