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track mounted rail grinders

track mounted rail grinders

Rail Grinding Types And Practices AGICO Rail

When talking about rail grinding, the rail defects are needed to be introduced first. Rails are subjected to extreme stress and compact from train wheels. Damages on the rail surface will inevitably appear. Common rail defects include vertical wear, side wear, rail corrugation, contact fatigue wear , plastic flow, etc. These independent defects of the rail will be a shock each time the train wheel passing by, and then generate a load that is several times higher than normal. Therefore, the rails are under high pressure. Under normal circumstances, these damages will expand further, some severe conditions will cause the railway to fail. Not only the rails are affected. The rails cant absorb all the energy produced by the impact. These shocks will continue to pass on other track structure such as the rail pads and sleepers. Finally, the trackbed will sink locally and the railway loses its stability.

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The rail defects lead to the change of rail profile which causes the rail wheel contact unstable. Rail grinding is actually to cut the surface of the rail, remove the defects, and restore the rail to the optimal profile. The optimal rail profile is shown below in the figure. When the train is running on a straight line or a curve with a large radius, the wheel tread is in contact with the railhead area B. In this state, the contact stress and lateral creep force are the smallest; when the wheel flange is close to the rail gauge angle, that is in area C in the figure, when a conformal contact is formed, the contact stress is the smallest. The profile of the rail head is similar to an arc shape, but the actual grinding is to divide the rail head into different areas according to the angle, that is, the rail head profile is regarded as composed of line segments divided by angles, and the position that needs to be ground corresponds to is a certain angle. The more...

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Pre grinding

Pre grinding the new rail can remove the decarbonized layer and eliminate surface defects in the production, welding, transportation and construction of the rail. It can also optimize the profile of the rail head, and improve the smoothness of the welded joint. Besides, it can repair the rail surface damage caused during the track laying process. Rail wear developed in a time of progress, ensuring good contact between wheels and rails from the beginning can limit the initial damage.

Preventive grinding

Preventive grinding refers to grinding rails regularly, restore the rail profile so that the surface stress cracks on the rail can be eliminated at the initiation stage, and the propagation of the rail rolling contact fatigue cracks can be well controlled.

Corrective grinding

Corrective grinding refers to the operation of grinding rail after the surface defects are generated. Corrective grinding was prevalent at the birth stage of rail grinding technology. It is mainly carried out to repair rails by removing the severe damage on rail surfaces such as fatigue cracks, corrugation, spalling, plastic flow and other defects. The figure below shows the effect of preventive grinding and corrective grinding on the life of the rail. The yellow line represents preventive gr...

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How rails are ground There are mainly three ways. 1. Sliding shoe grinding Sliding shoe grinding is to grind away the surface of the rail by pressing the grindstone on the rail to perform the reciprocating motion. This grinding method can only grind the rail head longitudinally, and cannot adjust the rail profile or grind the switch. Also, the grinding speed is low. This method has been gradually eliminated. 1. Grinding wheel Grinding wheel grinding usually uses a high speed rotating grinding wheel driven by an electric motor or a hydraulic motor to grind the rail. This is an active grinding method and is currently the main grinding method. The rail is ground vertically and horizontally. There is also a kind of passive grinding. The position of the grinding wheel is inclined to a certain angle with the travelling direction of the train. The high speed operation of the power tractor drives the grinding wheel to rotate at a high speed on the rail. The relative movement between the gr...

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