Radially horizontally machined rail and use thereof

Abstract

Rail possessing a rail head, a rail foot and a rail neck which connects the rail head to the rail foot, wherein radial horizontal cut-outs with a radius (RP) are formed in the cross-section of the rail (17) providing a variable section over the entire length of the rail (17), wherein the minimum value of the length (H) of the rail (17) neck (57) at the location of the cut-out amounts to 4 / 5 of the height of the rail (17) neck (57) at a location outside the cut-out, and the minimum value of the one-sided excess (K7) of the rail (17) foot (67) amounts to 0.1 of the width of the railway sleeper (P7).

Description

[0001] Radially horizontally machined rail and use thereof

[0002] The subject of the present invention is a radially horizontally machined rail, in particular a railway rail, and a use thereof.

[0003] The rails, in particular railway rails, known in the prior art, as described in the PN-EN 13674-1 standard, consist of a foot, a rail head and a neck with a specified minimum value of width. In particular, rails with a variable thickness of the neck and rails with a constant thickness of the neck are distinguished among the solutions used. A common peculiar feature of these solutions is the invariability of the cross-section of the rail over the entire length of the rail.

[0004] The document EA029813B1 discloses a railway rail possessing opening-shaped horizontal cut-outs and arc-like-shaped horizontal cut-outs made in order to reduce the weight of the rail.

[0005] The document RU2491381C1 discloses a railway rail possessing opening-shaped horizontal cut-outs made in order to reduce the weight of the rail.

[0006] Due to their shape and the thermal expansion inherent in steel, the railway rails currently used in practice, e.g. those described in the PN-EN 13674-1 standard, are susceptible to the phenomenon of a spontaneous release of thermal stresses, known as "rail stressing", especially in contactless railway tracks. Moreover, the rails currently used are characterized by their substantial weight. The solution described in RU2491381C1 does not take into consideration the positions and the dimensions of the railway sleepers in the arrangement of the horizontal cut-outs in the rail. This feature of the solution may result in heterogeneity of the stresses arisen in the rail that lead to a premature wear of the rail made acc. to this description. The solution described in EA029813B1 is characterized by the presence of horizontal cut-outs that interfere to a significant extent with the structure of the rail, which may give rise to the phenomenon of a notch that significantly reduces the strength of the rails made acc. to this description. Furthermore, this solution does not take into consideration the dimensions of the railway sleepers in the arrangement of the horizontal cut-outs in the rail.

[0007] The object of the present invention is to supply an improved radially horizontally machined rail which eliminates the inconveniences known from the prior art, such as: an excessive weight of the rail, an unfavorable shape of the horizontal cut-outs and susceptibility to the phenomenon of "rail stressing". The essence of the present invention is to present a shape of the rail that is distinct from the existing solutions and that significantly improves the operational parameters of the rail, that is: to increase the resistance of the rail to "rail stressing"; to reduce the weight of the rail; to save the steel necessary to make the rail.

[0008] The advantage of the present invention with respect to the prior art is that it provides savings in the steel from which the rails are made (which in turn may contribute to a reduction of the production, transport and maintenance costs of the tracks), the weight of the rail is smaller, and also the thermal deformations of the rail associated with the phenomenon of thermal expansion are smaller.

[0009] The subject of the present invention is a rail possessing a rail head, a rail foot and a rail neck which connects the rail head to the rail foot. At the same time, radial horizontal cut-outs with a specific radius are formed at regular intervals in the cross-section of the rail providing a variable section over the length of the rail, wherein the minimum value of the height of the rail neck at the location of the cut-out amounts to 4 / 5 of the height of the rail neck at a location outside the cut-out, and the minimum value of the one-sided excess of the rail foot amounts to 0.1 of the width of the railway sleeper.

[0010] The subject of the present invention is also a use of such a rail in railed railway tracks.

[0011] The embodiments according to the present invention are visualized in the drawings in which

[0012] Fig. 1 - shows a rail in a general view and sections,

[0013] Fig. 2 - shows the sections of the rail in the area of radial horizontal cut-outs.

[0014] The embodiment shown in Fig. 1 and 2 relates to a radially horizontally machined rail 17 the cross-section of which is variable along its length in a manner resulting from horizontal radial cut-outs with radii RP, shown in Fig. 1, having been made by machining on this rail at regular intervals amounting to S7.

[0015] A simplified section, denoted as 18 in Fig. 1, of the rails with the radial horizontal cutouts, made in the axis of symmetry of the railway sleeper marked as 27, of Fig. 1, is similar to a section of the rail described in the commonly available PN-EN 13674-1 standards. Similarly to the known solutions, a rail foot 67, neck 57 and head 47 may be distinguished herein.

[0016] Simplified sections C7-C7, D7-D7 and E7-E7 of Fig. 1, made in the area of the radial horizontal cut-outs, are shown in Fig. 2. The rail with the radial horizontal cut-outs implemented by, e.g., machining or extrusion, is intended for use in sleepered railway tracks with a regular gauge of the sleepers, denoted as S7 in the axes of symmetry of the sleepers in Fig. 1. Is it preferable to use radial horizontal cut-outs, as this shape of the cut-out minimizes the occurrence probability of the phenomenon of a notch. The rail with the radial horizontal cutouts may be made through radial cut-outs made on an existing finished product, e.g. described in the PN-EN 13674-1 standard, while maintaining the relationships shown in Fig. 1 and relating to the minimum value of the length of the neck H (that is, min. H = h-4 / 5) and the minimum value of the one-sided excess (overhang) K7 of the rail 17 foot 67 from the railway sleeper 27 (that is, min. K7 = 0.1 of P7). The value of the radius of the cut-out RP results from the aforementioned relationships and from the circumstances shown in Fig. 1.

[0017] Fig. 1 shows the standardized rail 17 in a cross-section. The rail 17 has dimensions typical of standard railway rails (it meets the requirements of the PN-EN 13674-1 standard), i.e. the total height of the rail is 149 mm (for the rail 49E1), 172 mm (for the rail 60E1), the width of the foot (67) is 125 mm (for the rail 49E1), 150 mm (for the rail 60E1). The rail is produced from, among others, carbon-manganese steel R260 or R350 HT. The length of the rail neck 57 for the rail 60E1 amounts to h = 89.5 mm, for the rail 49E1 it amounts to h = 70 mm. The width P7 of the sleeper 27 amounts to 160 mm at the location where the rail is supported.

[0018] The radial cut-outs with the radius RP, passing through the rail foot 67 and partially through the rail neck 57 were made by machining over the entire length of the rail 17, at regular intervals amounting to S7. The radius (RP) of the cut-out amounts to 288 mm (in the case of the gauge S7 of the sleepers 27 amounting to S7 = 0.6 m) or 623 mm (in the case of the gauge S7 of the sleepers 27 amounting to S7 = 0.8 m) - the rail 60E1. In the case of the rail 49E1, the radius (RP) of the cut-out amounts to 350 mm (for S7 = 0.6 m) or 779 mm (for S7 = 0.8 m).

[0019] The rail with the radial horizontal cut-outs can be made as a separate finished product, while maintaining the relationships as above, shown in Fig. 1.

[0020] The present invention finds use in the railway industry, and especially in the construction of railed railway tracks. List of reference signs:

[0021] 17- radially horizontally machined railway rail,

[0022] 18 - simplified section of the radially horizontally machined railway rail, made outside the area of machining, i.e., in the axis of symmetry of railway sleeper 27,

[0023] 27 - railway sleeper for the rail 17,

[0024] F7 - axis of symmetry of the railway sleeper 27,

[0025] S7 - gauge of the railway sleepers 27 in the axes of symmetry F7,

[0026] 37 - arcuate surface created as a result of radial cut-out with radius RP,

[0027] 47 - radially horizontally machined rail head,

[0028] 57 - radially horizontally machined rail neck,

[0029] 67 - radially horizontally machined rail foot,

[0030] C7 - C7 characteristic section of the radially horizontally machined rail,

[0031] D7 - D7 characteristic section of the radially horizontally machined rail,

[0032] E7 - E7 characteristic section of the radially horizontally machined rail,

[0033] H - minimum height of the rail neck in the area of horizontal machining, h - height of the rail neck outside the area of horizontal machining,

[0034] K7 - magnitude of one-sided excess (overhang) of the rail foot from the railway sleeper,

[0035] P7 - width of the railway sleeper for the radially horizontally machined rail,

[0036] RP - radius of the cut-out created as a result of radial horizontal machining.

Claims

Claims1. A rail possessing a rail head, a rail foot and a rail neck which connects the rail head to the rail foot, characterized in that radial horizontal cut-outs with a radius (RP) are formed in the cross-section of the rail (17) providing a variable section over the entire length of the rail (17), wherein the minimum value of the length (H) of the rail (17) neck (57) at the location of the cut-out amounts to 4 / 5 of the height of the rail (17) neck (57) at a location outside the cut-out, and the minimum value of the one-sided excess (K7) of the rail (17) foot (67) amounts to 0.1 of the width of the railway sleeper (P7).

2. A use of the rail as set out in claim 1 in railed railway tracks.

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