Rail vehicle wheel shaft thermal insert technique method

Abstract

A hot charging technique method of wheel axles of railway vehicles comprises the steps of matching tread diameter and the diameter of the internal hole of the two wheels arranged on the same axle, confirming magnitude of interference matched with the axle, scrubbing the surface of the wheels, putting the wheels in an incubator according to the sequence of the wheel shaft on the axles after natural drying, setting temperature to be 220 to 240 DEG C and constant temperature time to be 2.5 to 3.5 hours, heating, at the moment putting the axles on a shelf in sequence, opening the incubator after 2.5 to 3.5 hours, assembling wheels according to the sequence of the wheels on the wheel shaft, at the same time detecting the wheel-position difference and the distance of inner side until being qualified, detecting the wheel-position difference and the distance of inner side again after cooling for 1 to 2 hours, starting an anti-thrust test in which testing load value is 840 to 1100 kilonewton after cooling for 24 hours, and continuing the check of resistance value and flaw inspection. Surface contact stress of the invention is zero, and 100 percent flaw inspection is qualified, thus service life is greatly prolonged and back repair rate and rejection rate are zero; the wheel-position difference can be steadied within 0.3 mm and assembly error can be completely avoided.

Description

technical field [0001] The invention relates to a wheel axle assembling process method, in particular to a rail vehicle wheel axle thermal assembling process method. Background technique [0002] The traditional press-fitting of vehicle wheel axles is to select two inner holes of the wheels and the corresponding diameters of the wheel seats on both sides of the axle to confirm the interference; then put the wheels on both sides of the axle in advance and transport them to the special platform of the equipment; The equipment press-fits the left and right wheels one by one, and adjusts the running speed of the piston in advance to run at about 120-160mm per minute. During the press-fitting process, observe the composite curve shape of displacement and load. After visually observing the position, press the stop button instantly , to make the piston retract, because the tolerance is only 0.5-1 mm, so the operator is required to respond within 0.1 second; detect the inner distanc...

AI Technical Summary

Problems solved by technology

Even if the ultrasonic flaw detection is qualified, it will definitely reduce the service life of the axle during the maintenance process; in addition, due to various subjective and objective reasons, the repair rate of this press-fitting process is generally around 8%, and the scrap rate is generally around 1.5%. , the direct economic loss will be close to 10,000 yuan, especially if the wheel set with the gearbox is press-fitted. There will be a delay of several months; and because the operator's brain is required to respond extremely fast, and the annual output reaches 8,000-10,000 pieces, there is a probability of error; at the same time, this press-fitting process cannot achieve precise assembly accuracy, and the wheel position is poor 0.5 mm is the limit accuracy, it is impossible to improve