A Micro-deformation Control Technology of Split Type Axle Box

Abstract

The invention relates to a micro-deformation control process for a split axle box body. The micro-deformation control process specifically comprises the following steps: carrying out blank casting onan upper box body and a lower box body separately; carrying out rough machining on single elements; carrying out heat treatment on the single elements; carrying out finish machining on the single elements; carrying out box combination, machining a bearing hole, a node hole and the two end surfaces of the axle box body and a node, machining a labyrinth groove in the inner surface of the bearing hole as well as a shock absorber seat, a cowcatcher installation seat, a top surface, a bottom surface and a cylinder which surround the axle box body by taking the machined bearing hole, node hole and end surfaces as location reference; carrying out semi-finish milling and boring for the bearing hole; carrying out box splitting, and then placing the box bodies under a room-temperature condition andcarrying out aging treatment separately; carrying out fine trimming on a box splitting surface; carrying out box combination and carrying out semi-finish milling and boring for the bearing hole; carrying out box splitting, and then carrying out polishing; and carrying out box combination again, detecting the axle box body subjected to the box combination, and then carrying out sand blasting and painting. According to the micro-deformation control process disclosed by the invention, the micro-deformation of the axle box body is prevented and controlled simultaneously in many aspects through reasonable optimization for a process flow and optimization for process parameters, so that the product pass percent is increased, the production period is ensured, and the production cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of axle box body processing of rail vehicles, and in particular relates to a micro-deformation control process of a split axle box body. Background technique [0002] In order to meet the requirements of the Railway Corporation for the replacement of a single-wheel set without lifting the car, a split axle box structure is used on the standard EMU and the high-cold EMU to replace the original integral axle box. According to the processing technology requirements of the split axle box, the upper and lower boxes need to be separated after the finishing of the axle box, and reassembled with bolts, flat washers, and spring washers with a torque wrench after 4 hours. After assembly, it is required to measure the inside of each section Hole size, within tolerance. [0003] After the split-type axle box undergoes traditional processing technology, it needs to go through many processes such as unpacking, box closin...

AI Technical Summary

Problems solved by technology

[0003] After the split-type axle box undergoes traditional processing technology, it needs to go through many processes such as unpacking, box closing, transportation, and painting. Before the axle box is assembled, the bearing hole sizes are often inconsistent, and the bearing hole sizes in different parts are out of tolerance. Problems such as micro-deformation occur, resulting in a low pass rate after assembly, increased manufacturing costs, and prolonged production cycles

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