SOLUTION FOR PROBLEMS OF RAIL-WHEEL
The problem of joint work of wheel and rail, the increase of their reliability and durability is quite appropriate on all Railways of the world. In the mountainous terrain, and in curves increase corners of crowding of the wheel flange on the rail, which results in high shear forces on the wheel and the associated increased wear of wheels and rails. When higher speeds are possible gatherings cars. On the Railways under adverse operating conditions, there have been outbreaks of catastrophic wear of the wheel and the side surfaces of rails even in the plains in sharp bends.
Urban tram traffic on the rails rate of wear less, but frequent replacement of wheels and especially rails in the conditions of the city are very expensive. Developed by «TOPAS-Technology» technology and equipment for plasma surface hardening of the ridges of solid-rolled and retaining wheels allows hardening of wheel flanges of locomotives, passenger and freight cars, suburban electric trains. A unique experience of forming the optimal (from the point of view of operation together with a lateral side of a rail) hardening structures.
Equipment and technology ensure high resistance against fracturing in the range of change of surface hardness within 300 - 600 HB.
Equipment and technology ensure repeatability of the optimal structure of the hardened zone ridge in the range of change of ambient temperature from - 10 C to +40 C (this effect is protected by a patent and allows hardening rail in any weather and wind in the open atmosphere directly on the tracks).
The intensity of wear of the plasma hardened ridges of wheel pairs is much lower (2.5 - 3 times).
The annual economic effect from the introduction of equipment and technologies from $ 2.5 up to $ 3 million.
In operational TERMS, TRAMS AND RAIL track at a MUCH LOWER LOAD deterioration RATES HARDENED WHEEL AND RAIL will be REDUCED by 30-40%.
Regulation of friction in the contact zone of wheel and rail is an important problem. Friction has a great influence on the interaction of the wheel-rail system and ultimately on the operating costs of Railways. On the Railways of the world's most widespread technical means
reducing the coefficient of friction (lubrication of rails) are stationary travel lubricators. However, they are unserviceable and not provide an adequate level of quality of lubrication. Very often, especially in mountainous conditions, when oil getting on the roll surface to avoid slipping wheels have to pour sand, which leads to the opposite result - increased wear of the wheel flange and side face of the rail head.
Plasma surface hardening
Depreciation slows down the ridge
Working form is saved
1. Not deficient, cheap, высокоэнтальпийная, chemically active plasma products of combustion air with methane is widely used for technological purposes.
2. Developed specialized equipment and technology of high-speed plasma hardening of wheelsets.
3.technical provides surface hardening at a depth of 2-3 mm track width 25-30 mm at speed of 1-1 .5 cm/sec.
4. The hardness of the hardened layer can be adjusted within a wide range from 300 to 700 HB, its structure becomes fine with improved mechanical characteristics.
5. Technology is characterized by new capabilities of increasing contact-fatigue strength of material and service life the wheels of locomotives and cars, as well as resistance against cracking.
6. The intensity of wear of the plasma hardened wheel in 2-3 times less than standard.