Processing technique for top surface of rail

Abstract

The invention relates to a processing technique for the top surface of a rail, which is implemented by the following process flows: primary baiting; saw cutting; press molding; secondary baiting; aligning; milling a compressed section rail base; fine tuning; drilling; milling blot grooves of the rail base and rail web; milling a working edge and a non-working edge of a rail head; milling a rail top and derating; quenching; and leveling. The fine turning flow comprises the following steps of: firstly, leveling the rail base of the rail, ensuring that the flatness of the rail base is less than or equal to 0.5mm; secondly, obtaining the relative altitude difference of the rail base, a rail top surface and two sides of the rail head, detecting the straightness of the two sides of the compressed section rail head and the straightness of the rail top surface by using a leveling ruler, ensuring that an idle line between the two sides of the molded section rail head and raw materials of the rail is 1mm, and the top surface of the molded section rail is 1.5mm higher than the top surface of the raw materials of the rail; and finally, detecting the 1:40 inclination of a heal end and the altitude difference of the rail base by using an altitude difference testing tool and 1:40 inclined testing equipment. According to the processing technique, a novel copying tool is used for machining the rail top surface of the 60D40 rail, so the molded section and a transition section are in smooth transition with the raw materials; the fitting degree of the machined top surface of the 60D40 rail is more complete; and the machining accuracy of the products is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of railway track manufacturing, in particular to a 60D40 rail top surface processing technology. Background technique [0002] In the passenger-only turnout, the point rail and the long center rail are made of 60D40 rail, and the profiled section is hot forged to form a 60kg / m rail section. In order to reduce the influence of the forging section on the performance of the decarburized layer, the top surface A certain amount of processing allowance reserved is removed by processing, so there is a transition problem between the processing section and the raw material. Because of the complexity of the processing of the transition section, the usual method is to adopt the processing method of slicing and gradual transition. There is a transition range of a certain length, where the straightness, hat shape, etc. will have certain deviations. During the operation of the line, the bright band on the top surface of t...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a rail top surface processing technology to solve the existing processing method to solve the problem of deviations in the straightness and hat shape of the rail top in the transition range caused by the long transition range. The processing method of the shape milling cutter can not only achieve a smooth transition, but also ensure the top surface profile of the profiling section rail, eliminate the unevenness of the bright band caused by the uneven connection of the cutter, and improve the operation status of the train

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