Management of rail wave mills

Management of rail wave mills

Rail wave wear is one of the forms of rail injury and damage. At present, the measurement of rail wave wear (measurement of rail short wave unevenness)

and remediation is the main content of the current.

For line maintenance personnel, generally only need to use 1m fixed length straightedge and plug ruler, directly measure the short wave uneven depth, according to whether the depth exceeds the standard value to determine whether the operation needs to repair. For researchers, waveform data is generally obtained through hand-pushed shortwave measurement equipment, the one-third octave energy value of the waveform is calculated and compared with the normative reference value, or the vehicle-track coupling dynamics method is used to analyse the train response caused by wave wear, and then the maintenance specifications for safety and smoothness of traffic are used as the basis to achieve the assessment of wave wear, so that a A recommendation is made as to whether maintenance is required.

At present, the rail short-wave irregularity management method is mainly based on the current rail surface short-wave existence state, relying on the line maintenance personnel's traditional measurement, and rely on personal experience to develop grinding plan. The measurement results are not very accurate and the grinding plan is not perfect. In order to properly solve the problem of measuring short wave irregularities and to develop a more perfect grinding plan, Southwest Jiaotong University has developed this system through 5 years of theoretical research and field practice, and after 4 generations of product iteration, it has now reached a mature and reliable state for market application. 

The MCR series of rail short wave unevenness precision measuring equipment can be used to detect the rail surface condition, its detection data can be used as the main basis for the development of the rail grinding plan, and can check the quality of the rail grinding operation.MCR series of products are simple to operate, by the operator to push the trolley, can achieve the detection of rail short wave unevenness. The principle of detection is the one chord N point chord measurement method, which can be used quickly and easily and can detect long railway intervals, thus solving the problem of measuring short-wave irregularities in rails.

Of course, rail grinding is the most common method used to deal with all types of wave wear, apart from rail replacement, grinding (or rail profile optimisation) is also the only way to remove existing wave wear. Rail grinding can be divided into four different types depending on the stage: new rail grinding, preventive grinding, maintenance grinding and repair grinding.
Type 1: New rail grinding, which is carried out on new rails just after the construction of a new line or after the replacement of rails.
Type 2: Preventive grinding, is in the rail short wave unevenness defects reach serious before the preventive grinding operation, to prevent the fatigue type wave grinding generation and development, grinding cycle is short, shallow depth, the operation according to the operating cycle to determine.
Type 3: Maintenance grinding, mainly in the light microwave wear section can be used maintenance grinding, namely to prevent the rail surface disease further development and restore the rail profile and grinding, the main purpose is to slow down the development of wave wear and other contact fatigue injury.
Type 4: Maintenance grinding, depending on the extent and symptoms of the rail defects, is carried out to eliminate the defects on the rail surface, thus keeping the rail in a healthy condition.