Special-shaped rail manufacturing method

Abstract

The invention provides a special-shaped rail manufacturing method. A special-shaped rail comprises a groove type rail, a transition rail and a standard I-shaped steel rail which are connected in sequence, wherein the end face of one end of the transition rail is matched with the end face of the standard I-shaped steel rail, and the end face of the other end of the transition rail is matched with the end face of the groove type rail. The manufacturing method comprises the following steps that 1, a five-axis linkage numerical control machining center is adopted for fixing a forging stock, and the forging stock is machined into the transition rail through a numerical control profiling forming tool; 2, the end faces of the two ends of the transition rail are aligned and attached to the pretreated end faces of the groove type rail and the standard I-shaped steel rail correspondingly, and then a flash welding machine is adopted for welding; and 3 post-treatment is carried out on welding seams after flash welding is conducted between the groove type rail and the transition rail and between the standard I-shaped steel rail and the transition rail. According to the special-shaped rail manufacturing method, the problems existing in die forging forming and a large amount of manual welding of the special-shaped rail in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of railway turnout manufacturing, in particular to a method for manufacturing a special-shaped rail. Background technique [0002] Domestic trams mostly use 50kg / m standard I-shaped rails in stations, while 59R2 grooved rails are mostly used on main lines. At the joint between the standard I-shaped rail and the grooved rail, two different types of rails with height differences are usually connected together by on-site direct butt welding, and then special-shaped fishtail reinforcement is welded at the weak position of the wrong surface of the rail waist joint plate. Due to the large size difference of the welding surface, the welding can only be carried out under the condition that the working edge is smooth, and the rest of the parts have large misalignment, low joint strength, poor toughness, and obvious stress concentration effect, which is not conducive to the running speed of the tram improvement. Th...

AI Technical Summary

Problems solved by technology

Although the special-shaped transition rail has the advantages of simple forging process and low cost, it has the following defects: when the reinforcement plate is welded, the reinforcement plate needs to be welded around the reinforcement plate manually, resulting in many manual welding positions and weak links, resulting in low joint strength and Poor appearance

In addition, a lot of manual polishing is required to smooth the uneven parts after the reinforcement plate is welded, which is time-consuming and labor-intensive

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