Wheelset Crimp Contact Process Analysis And Research

The main function of the vehicle wheelset is to bear all the dynamic and static loads of the vehicle, transfer it to the guide rails and rotate at high speed along the track under heavy load. Not only that, the driving and braking of rail transit vehicles are also mainly achieved by acting on the wheelset. Therefore, the wheelset plays an extremely critical role in the locomotive, and the quality of assembly directly affects the safety and comfort of railway transportation. The wheelset of rail transit vehicles not only bears the entire load of the train, but also needs to rotate at high speed on the train track under load conditions, which places high demands on the manufacturing process of axles and wheels and the press-fitting process of wheelsets. In the high-speed rail manufacturing process, wheelset press-fitting technology is a very important part, and good press-fitting quality and precision have a vital impact on the safe operation of the train. At present, the mainstream press-fitting method for axles and wheels is crimp contact installation, and the crimp contact pin installation process has become a more commonly used press-fitting process due to its convenient operation and reliable quality.
1 Principle of wheel set contact socket crimp press-fit
First, place the axle horizontally, put the wheel on the axle, and under the action of contact socket crimp loading force, make the wheel move inward along the axial direction, and produce elastic-plastic deformation on the contact surface between the wheel and the axle. When the contact socket crimp loading force is greater than the friction between the contact surfaces, the axle and the hub hole surface will move relative to each other, thus achieving the purpose of contact socket crimp installation. The technical parameters of female crimp contact are as follows: surface roughness, wheel seat cylindricality, hub hole cylindricality, fit interference, press-fit speed, lubricating medium, etc.
2 male crimp contact process flow
The wheelset of the high-speed EMU is connected to the bogie on the one hand, supporting the whole EMU, and on the other hand, it contacts the guide rail and rotates at high speed along the guide rail. It is the most basic and important structure in the train and has an important impact on the safety of the train. It can be said that without the guarantee of the quality of the wheelset, the development requirements of high-speed and heavy-loaded trains are empty talk, so a high press-fit quality is required when pressing the wheelset, which puts high demands on the manufacturing process of the wheelset.