Processing technique for top surface of rail

A surface processing and rail top technology, applied in metal processing equipment, manufacturing tools, details of milling machine equipment, etc., can solve the problems of rail top straightness, hat shape deviation, uneven bright band in the transition range, and achieve a perfect fit. , to ensure product processing accuracy, the effect of good machined surface quality

CN101716717AActive Publication Date: 2010-06-02CHINA RAILWAY BAOJI BRIDGE GRP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-06-02

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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.
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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...

Examples

Embodiment Construction

[0010] The present invention is suitable for the full-length processing of the top surface of 60D40 rails, and its technological process is as follows: one-time blanking→saw cutting→pressing→secondary blanking→straightening→milling and pressing the rail bottom of the profiled section→fine adjustment→drilling→milling Rail bottom and rail waist bolt groove → milling rail head working side and non-working side → milling rail top reduction value → quenching → correction.

[0011] Program implementation steps and control points:

[0012] 1. Cutting and sawing: take the 60D40 rail of the required length;

[0013] 2. Pressing section pressing: press the 60D40 rail pressing section into a 60kg / m rail for easy connection with the guide rail.

[0014] 3. Straightening: Because forging belongs to hot processing, after the forging is completed, the rough adjustment process of the rail must be completed on the top bender, because there is a certain machining allowance on the rail head and...