Study On The Machining Technique For Axle Box Body Of Divided Axle Box Component

With the fast development of national economy and the unceasing improvement of the manufacturing technology, the restriction situation of the railway"bottleneck"will be eased because of the speeding up, mean while, the parts of better quality on the railway cars are required. There are two kinds of the axle box body, both of which play important roles on carriage bogie, one being the whole type and the other being the divided type. The divided axis box components are composed of the axis box body, the arm and the hoop. The arm and the hoop are fixed through bolt connection on the outside circle of the axle box body.Based on the project of "The manufacturing processing improvement of the partial elements of carriage bogie of Changchun Railway Vehicles CO,.LTD", this paper analyzed the processing of divided axle box body used in bogie presently are made some researches and explorations to some relatively crucial processes of axle box body, aiming at the quality problem and the situation of low processing efficiency during the production of the axle box body. It has stronger pertinence and practicability.It can be known through the on-the-spot investigation that there are a few problems during the processing of axle box body:â‘ out of tolerance of hole cylindricity of axis box and bearingâ‘¡out of tolerance of the coaxial degree of maze grooves relative to holeâ‘¢The processing efficiency of the existing axle box body is relatively low. According to the analysis and research about the processing, a lot of problems need to be solved, such as the irrationality of blank size, process size and allowance in original processing. On the basis of the size chain principle, we calculated the process size and the mental allowance of the axis box body, pointing out that the cast size and mental allowance are bigger than the required size. The method of cause and effect was adopted to analyze and seek systematically the reason for the quality problem, to analyze the influence of the clipping deformation, the tool and cutting conditions on the precision according to the out of tolerance. Based on material mechanics and Elasticity-related law, the formula of shape error is derived from the clipping deformation which can be used to calculate the deformed size caused by different clamping force. It is discovered that the cutting parameters are much smaller than the required ones in the original process after optimization calculation of cutting parameters was done. Finally, an improved scheme was put forward. And, a set of complete process file was done.