Heavy Steel Rail Side wear

Heavy duty rail wear

Heavy-duty rail wear mainly refers to the small radius curve on the side of the heavy rail wear and wave wear. As for the vertical wear is generally normal, with the axle weight and increased by the increase in gross weight. Improper setting of the track geometry causes the vertical wear rate to be accelerated, which is to be prevented by adjusting the geometric size of the track.

(1) side wear

Side wear occurs on a heavy-duty rail with a small radius curve, which is one of the main types of damage on the curve. When the train is running on the curve, the friction and sliding of the wheel and rail are the root cause of the outer rail side grinding. Train through a small radius curve, usually there will be two wheel and rail contact situation, then the largest side of the grinding. The size of the side mill can be expressed by the product of the conductor and the impact angle, that is, the wear factor. Improve the conditions of the train through the curve, such as the use of wear-type wheel tread, the use of radial bogie will reduce the rate of side grinding.

From the business point of view, should improve the heavy rail material, the use of wear-resistant rails, such as high hard rare earth rail wear resistance is about 2 times the normal track, quenching rail more than 1 times.

Strengthen the maintenance and repair, set the appropriate gauge, the outer rail high and rail base slope, increase the flexibility of the line, in the side of the heavy rail oil, etc., can reduce the side wear effect.

(2) wavy wear

Wavy wear refers to the heavy rails appear on the top of the wavy uneven wear, in essence, wave-shaped collapse. Wave grinding will cause a high wheel-rail power to accelerate the damage to the locomotive and rail parts, increase maintenance and repair costs; in addition to the violent vibration of the train will make passengers discomfort, serious threat to traffic safety; origin of. Some of our cargo lines on the line, there has been a serious wave mill. Its development faster than the side grinding, as the main reason for the change.

Wave mill can be divided into short wavelength (or ripple) and long wave (or wave). The ripple is a periodic irregularity with a wavelength of about 50 to 100 mm and a fluctuation of 0.1 to 0.4 mm. The long wave is a periodic irregularity with a wavelength of 100 mm or more and 3000 mm or less.

The wave mill mainly appears on the heavy transport line, especially the coal transportation line is particularly serious, in the high-speed high passenger line also have different degrees of occurrence, the city subway is also more common. Train speed higher on the railway, the main occurrence of ripple wear, and mainly in the straight line and brake lots. In the lower speed of heavy transport lines on the main wave wear, and generally appear in the curve of the lot. There are many factors that affect the development of heavy rails, involving heavy rail material, line and vehicle conditions and other aspects. Countries around the world are committed to the study of the causes of heavy gauge rail wear. There are dozens of theories about the origin of wavemaking, which can be divided into two categories: the theory of dynamic genesis and the theory of non-dynamic genesis. In general, the dynamic effect is the formation of heavy-duty rail wave mill, the performance of heavy rail material is the internal cause of wave. In fact, it is quite difficult to summarize all the causes of heavy-duty rails by means of a certain aspect of the analysis, and the vehicle and the orbit must be used as a system to study the formation of various vibrations, from a multifaceted, multidisciplinary study , In order to grasp the whole picture of the cause of wave.