Simulation And Technological Analysis Of Die Forming Processes About 50AT Ending Part Of Touque Rail

With the development of high-speed heavy-duty rail transportation,rail is gradually replaced by heavy rail. The corresponding point of the tip rail has been produced by special section of rail; materials are selected U75V steel, it provides a large stiffness, good wear resistance, security, and life-long lines accessories to improve the quality of lines.AT-type orbit due to a sharp end with the complexity of forging forming process, the feasibility, stability, forming quality, materials utilization, as well as how to improve the Mold life is pointed in the development of AT-type side rail forming process with the key points of consideration necessary.This article based on the production conditions of the workshop, the first use of Gleeble-1500 thermal simulation testing machine to measure the U75v steel at high temperature under hot compression of the flow stress to study the deformation parameters (deformation temperature, strain rate, deformation etc.) on the flow stress of steel U75V impact. Determine the flow stress of metal-plastic mathematical model, its mathematical regression model, it proves that this model has a good curve fitting characteristics, computing and technology can be used as the basis for numerical simulation. DEFORM establish an numerical simulation of material models for AT-type orbit with the sharp end of forging forming process, choose the best parameters of the thermal deformation of reference.In the three-dimensional modeling software Pro / ENGINEER Wildfire (Pro / E) of the CAD platform, we did the AT-type orbit with a pointed end of the forming of the mold design step. AT-type tip for rail forging forming process with the end of several key technical issues, shortleg growth, long-track waist high, forming the transitional paragraph and so on, the use of finite element numerical simulation software DEFORM3D of their numerical simulation of forming process. A comprehensive analysis of the AT type with a sharp side-track the process of forging metal forming flow, stress and strain distribution, temperature distribution, and then through a series of simulation, analysis of the friction coefficient on the maximum forming load, the maximum die the effects of temperature, and the least squares polynomial fitting has been the impact of the law between them.Through the study of the subject will die forging process, numerical simulation technology and mold CAD technology combine to achieve a shortened product development cycle to improve the die life, reduce costs such purposes. Results of research on this topic on the tip rail AT-type of production and the associated die design , and can be used to guide production.