Method for controlling welding curved surface deformation of cab of railway vehicle

Abstract

The invention discloses a method for controlling welding curved surface deformation of a cab of a railway vehicle, which relates to the field of welding and is invented to solve the problem of difficulty in controlling of the welding curved surface deformation of the cab of the railway vehicle and the like in the prior art. The method comprises the following steps of: connecting a vehicle top plate structure with plate structures on both sides of the vehicle top plate by spot welding so as to form an arc-shaped blank carriage; arranging a support tool and a pulling tool in the blank carriage; upwardly deforming the vehicle top plate under the action of the support tool; inwardly deforming the plate structures on both sides under the action of a pulling tool; welding the vehicle top plate, the vehicle top plate and the plate structures on both sides so as to finish a semi-finished carriage; after weld joint temperature falls, removing the support tool and the pulling tool; and heating and adjusting the semi-finished carriage so as to obtain a finished carriage. An internal supporting and pulling method before welding is adopted, the height of the carriage is greater than a tolerance dimension before welding, the distance between the plate structures on both sides is smaller than a width tolerance dimension, supporting and pulling external force is removed after welding and cooling, and most detection points on the vehicle top plate and the plate structures on both sides rebound into a tolerance range, so that adjustment and maintenance workload is lowered and an outer profile is ensured.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for controlling the deformation of the welding curved surface of a rail vehicle driver's cab Background technique [0002] Due to the high-speed operation of the EMU, it bears the impact of high-frequency vibration loads. The shape of the aluminum alloy carriages of the EMU, especially the front part, is designed in a three-dimensional streamlined design, so the control of its outline is very important. According to the existing manufacturing process of the car body, although it can meet the production requirements in theory, the deformation of the outer contour of the car body due to factors such as large welding volume and excessive heat generation has not been considered in the actual work on site. , the rigid fixation of the jig on the assembled tire cannot guarantee its outer contour after welding. Most of the welds on the roof are outside. It is difficult to repa...

AI Technical Summary

Problems solved by technology

According to the existing manufacturing process of the car body, although it can meet the production requirements in theory, the deformation of the outer contour of the car body due to factors such as large welding volume and excessive heat generation has not been considered in the actual work on site. , the rigid fixation of the jig on the assembled tire cannot guarantee its outer contour after welding. Most of the welds on the roof are outside. It is difficult to repair, which seriously affects the quality of the car body and greatly increases the production cycle

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