Fishplate improvements and enhancements
The fishplate is a common railway accessory, but the fishplate will crack during use, so how to reduce the occurrence of cracks? According to the mechanism of fish plate crack occurrence and fretting fatigue theory, three important factors affecting crack generation can be considered, namely friction coefficient, sliding amplitude and contact pressure, to reduce the probability of crack generation.
(1) Reduce the coefficient of friction. This can be achieved in various ways, such as surface treatment, improving surface quality, or adding some form of intermediate to the contact surface of the material, etc.
(2) Reduce the slip range. To reduce the magnitude of the relative action between the rail and the fishplate, the slippage can be reduced by adjusting the fastening force between the rail and the fishplate, or by improving the condition of the joint and reducing the impact. Railway fittings manufacturers introduce glued fish The tail plate rarely broke, which also shows the effect of controlling the sliding amplitude on the life of the fish plate.
(3) Reduce the contact pressure. There are many factors that affect the contact pressure. Reducing the contact pressure will reduce the interaction strength between the track and the fishplate, working conditions, axle load, vehicle speed, etc., which will have a great impact on it, and some must be borne under working conditions Some, such as load and vehicle speed, can be adjusted by improving conditions, such as maintaining proper rail joints and good joint maintenance. In addition, the shape of the mating surface between the rail and the fishplate also affects the contact pressure.
Therefore, the production of fishplates must be carried out in strict accordance with the production process and the prescribed heat treatment system, and quality inspection should be carried out to reduce early failures caused by materials. Moreover, from the perspective of the complex use conditions of the fishplate, ensuring its production quality is also one of the useful safety measures.
