SU1752188A3 - Solid lubricant for pairs of friction wheel crest-rail - Google Patents

Abstract

The essence of the invention: the lubricant contains, wt.%: Epoxy resin 10-20; maleic anhydride 3-6: dibutyl phthalate 2-4; propylene glycol-1,2 2,5-3,5; concentrate based on molybdenum disulfide else. 2 tab.

Description

This invention relates to solid lubricants designed to protect the crests of wheel sets and rails from wear.

It is known that the most effective way to protect the crests of wheelsets and rails from wear is to use lubricants at the wheel-to-rail contact. Various types of lubricants have been proposed for this purpose; liquid oils, greases, pastes and solid lubricants, which were recommended to be applied to the contact area of the wheel-rail by means of various types of lubricators: locomotive, track, and also placed on special transport units.

However, the use of known ways to solve the problem of reducing the wear of the ridges of the wheel rails of rails proved difficult in the USSR. The unique length of the track, the intensity of movement, and the temperature gradient from -60 to + 60 ° C make it almost impossible to use and operate road lubricators that apply liquid or plastic lubricants to the rails.

The simplest solution to this problem is the use of solid lubricants made in the form of rods mounted on locomotives and supplying lubricant to the wheel flange.

Solid lubricants (lubricating rods) are known for use in these locomotive lubricators.

One of these technical solutions is graphite lubricating rods.

Yu.

09 00

 CJ

nor containing components wt.%: graphite brand TG-60; urea formaldehyde resin MF-11-30; L-90 axial oil: trichloromethylphosphinic acid dibutyl ester 1.0. Lubricating rods made of the specified lubricant have good lubricating properties, reduce the wear of the ridges 1.5-3.0 times.

However, these rods were not introduced in rail transport. With extensive operational tests, significant shortcomings were identified that make them practically inapplicable, namely: they were not provided with uninterrupted feed to the wheel flange (in winter, the rod freezes to the guide cylinder of the feeding device) and also due to increased brittleness, the lubricating rods are destroyed under the influence of vibration when driving locomotives.

The prototype of the invention is solid lubrication-lubricating rods ME-22 according to TU 32 CT. 558-83, - containing components wt.%: Molybdenum concentrate KMF (GOST 212-76) 85,0; ED-5 epoxy diane resin (GOST 1058776) 12.0; maleic anhydride (GOST 872877) 3,6.

However, the known lubrication turned out to be practically unacceptable on railway transport, both because of the poor lubricating properties of the ME-22 lubricant rods (molybdenum concentrate, which forms the basis of these rods, approximately 50% consists of sand, which is an abrasive material), and because uninterrupted supply of lubricant to the wheel flange (freezing of the rod to the surface of the feeding device in the winter period, destruction of the rods from vibration as a result of increased fragility).

The aim of the invention is to improve the anti-wear properties of the lubricant and ensure its uninterrupted supply to the pas; re friction.

To achieve this goal, the solid lubricant contains the following components, wt.% The epoxydian resin is 10-20; maleic anhydride 3-6; dibutyl phthalate 2-4, propylene glycol 1.2 2.5-3.5 and concentrate based on molybdenum disulfide the rest

up to 100.

It is recommended to use for the preparation of lubricants molybdenum concentrate of the brand KMF (GOST 212-76), epoxy diane of the brand ED 5 (GOST 10587-76), maleic anhydride (GOST). dibutyl phthalate (GOST 5894-78 or GOST 11153-75) propylene glycol 1.2 (TU 6-01-929-79).

The proposed solid lubricant can be prepared by a well-known specialist in the art by mixing to form a homogeneous mass of ingredients: molybdenum concentrate, propylene glycol 1.2, dibutyl acid Lat, an epoxidine resin mixture with maleic anhydride, heated to 60 ° C. The resulting mixture can be molded by pressing into a rod, for example, with a diameter of 20 mm, a length of 200 mm, or into a briquettes, for example, with a square section of 20 mm x 20 mm x 200 mm. The final operation is to heat the rod or bar to a temperature of 140-150 ° C, followed by aging for 24 hours in order to cure

0 epoxy resin.

PRI me R. In accordance with this technology, a 20 mm base and a 200 mm height are prepared in the form of cylindrical rods with a series of solid lubricant samples.

5 material containing various amounts of the above ingredients.

Recipe solid lubricants are given in table. one.

Cooked Lubricants

0 is subjected to the following tests.

Lubricating properties are examined on the SMTs-2 mechanical training unit, the friction unit of which consists of two rollers made of bandage and rail steel. The lower roller is rotated, the upper one is motionless. The lubricant is applied to the lower roller for 1 min by pressing a rod to it. At a rotation speed of 500 rpm and a load of 70 N, a running-in is performed for 10 min.

0 formation on the upper base spot roller. After that, the load increases to 700 N and the experiment continues until a sharp increase in the moment of friction. Lubricant is deemed to have passed

5 if he has worked for at least 30 minutes without a bully, and the area of the roller wear area does not exceed 040 cm2. When this condition is fulfilled, wear of the wheel flange is possible when using a lubricant material by no less than 1.5-2.0 times. This requirement is necessary to effectively protect the wheel flanges from wear.

Resistance of lubricating rods to

5 destruction under the action of vibration is determined on a vibration stand. In this case, the feeding device of a full-scale locomotive comb-lubricator is placed on the shaker table. Tests are performed at a frequency of 100 Hz and an amplitude of 1.5 mm.

min The evaluation of the state of the rods after the test is made visually. At the same time, the rod should not have signs of destruction: its surface should be smooth without cracks and chips.

The adhesion of a solid lubricant to ice is determined by the displacement forces of the metal plate on which the lubricant is applied, by the specially prepared ice surface. Starting from the maximum surface, the rod is freezing to the surface of the feeding device and the minimum force is pressed to the wheel flange. solid lubricant over the ice surface; however, it should not exceed 0.02 N / cm.

The service life of the lubricating rod for continuous lubrication should be calculated not less than for the locomotive traction shoulder, i.e. about 1000 km. Taking into account the overall dimensions of the body and the frequent locomotive chassis, the length of the lubricating rod should not be more than 200-220 mm, i.e. rod consumption should not exceed 6 mm / 100 km. The life of the lubrication rod is evaluated on an MT-CRI laboratory tribometer, where a steel roller (dHap 35 mm) and a solid lubrication rod base (dHap 8 mm) are used as the friction unit, which is pressed against the roller with a spring of 2N Roller roughness 0 , 7 microns. roller rotation speed 400 rpm, total test time 30 min. During the first 5 minutes, the roller is stopped every minute and the lubricant is removed with a cotton swab moistened with gasoline. A similar operation is performed for the next 10 minutes every 2 minutes and for the last 15 minutes every 3 minutes. The amount of rod wear is determined by the gravimetric method. The rod is considered to have passed the test if its wear rate does not exceed 0.0020 g.

The test results are presented in Table. 2

As follows from the data presented in table. 2. Ms 1 lubricant samples meet your requirements.

Nh 2 No. 3, that is, the components containing a high content, may%: epoxy resins U-20, maleic anhydride 3 0-6,0. dibutyl {chambers 2-4, prprilenglihr and 1 22 5- 3.5 and molybdenum concentrate CMF, Sample No. 4, containing epoxy resin below the specified limits, are not formed due to lack of binder. Sample No. 5, containing epoxy resin

above this norm, it is characterized by unsatisfactory lubricating properties. Samples No. 6 and N 7 with the content of dibutyl phthalate below and above the specified limits do not correspond

requirements for vibration and work life, respectively. Samples N 8 and No. 9 with the content of propylene glycol -1,2 below and above the specified limits do not correspond to the anti-icing properties and

resource work. Samples No. 10 and No. 11 with a content of maleic anhydride below and above the specified limits do not pass through the work resource and lubricating properties, respectively. Sample No. 12, described

in the literature, does not meet the requirements for anti-icing properties. Sample No. 13 (prototype) is characterized by unsatisfactory lubricating, anti-icing properties, vibration resistance and service life. Sample No. 14, which does not contain propylene glycol-1,2, did not pass the test for vibration resistance and anti-icing properties. Sample No. 15, not containing dibutyl phthalate, not

Claims (1)

Meets the requirements for vibration resistance, the claims of the invention are solid lubricant for a pair of friction wheel-rail comb containing a concentrate based on molybdenum disulfide, epoxy diane resin and maleic anhydride, characterized in that, in order to improve the antiwear properties of the lubricant and ensure its supply to the friction pair, the lubricant additionally contains dibutylft lat and propylene glycol-1,2 in the following ratio, wt.%: Epoxy-diane resin 10- 20 Maleic anhydride 3-6 Dibutyl phthalate 2-4 Propylene glycol-1,2 2,5-3,5 Concentrate on the basis of molybdenum disulfide Else Table 1 (prototype) 81.0 69.5 73.5 82.5 67.0 75.5 72.5 76.0 7, O 76.5 72.5 85.0 76.0 76.5 10.0 20.0 15.0 3.0 21.0 15.0 15.0 15.0 15.0 15.0 15.0 12.0 15.0 15.0 3.0 6.0 M 3.0 6.0 5.0 5.0 m m 2.5 6.5 3.0 5.0 5.0  KMF - molybdenum concentrate of grade KMF-1 (ore), which includes molybdenum hisisulfide (MoS2) 9.52 May, sand (5 South) 5.0 mA%, compounds C, Pb, As, P - 0, 8 May D. A sample of lubricant has the following composition, masd: graphite grade TG - 60.0; urea formaldehyde resin 30.0, axial oil L 9.0, trichloromethylphosphinic acid dibutyl ester 1.0. O.O -iO 0.038 0.045 oh oh but 0.040 0.033 Bez remarks Beth chdme-chapich cholly Take notice Without notice - osprey Without s1nechani | No remark No note Eamechani Nal tre Without chachimle chips No change- Chachiaie chipped chanmn Without zamena-chipped Scientific research institute oh oh 2.5 3.5 2.5 3.0 3.0 3.0 2.0 A.O. 3.0 3.0 M 3.5 table 2 whoin 0.018 0.018 0.018 0.025 0,016 0,017 0,017 Oh, OM 0.052 0.060 0.018 0,0020 0,0020 0.025 0, P02 0.0030 0.030 0.0020 0.0020 0, 0.0020 0.0020