A high-speed railway 60N rail rolling method with accurate control of fullness

Abstract

The present application relates to the technical field of railway rail production process, and provides a rolling method for realizing precise control of fullness of high-speed railway 60N rail, which is used for rolling 60N rail meeting fullness requirements, and comprises the following steps: making profiled steel pass through a UR rolling mill to obtain intermediate body rail, wherein the maximum arc radius of the intermediate part of the rail head vertical roll hole profile of the UR rolling mill meets the first size requirement with the maximum arc radius of the intermediate part of the standard section tread of the 60N rail; and making the intermediate body rail pass through a UF rolling mill to obtain 60N rail meeting fullness requirements, wherein the hole profile head width size of the UF rolling mill meets the second size requirement with the standard section head width size of the 60N rail, and the hole profile rail height size of the UF rolling mill meets the third size requirement with the standard section rail height size of the 60N rail. The present application can realize precise control of the fullness of the rail.

Description

Technical Field

[0001] This invention relates to the field of railway rail production technology, and more particularly to a method for rolling high-speed railway 60N rails to achieve precise control of fullness. Background Technology

[0002] Currently, universal rolling mills used for rolling steel rails typically consist of UR, E, and UF mills, which reciprocate and roll the finished steel rails in three passes.

[0003] Among them, the control of the dimensional accuracy of rail rolling is an important link. The tread fullness dimension is crucial for rails, especially for high-speed railway rails. Fullness involves the contact area and state between the train wheel and the rail. The dimensional accuracy of rail fullness is an aspect that needs to be reasonably controlled in rail production standards.

[0004] However, existing technologies often cannot achieve precise control over the fullness of the rails. Summary of the Invention

[0005] To address the aforementioned technical problems, a method for rolling 60N high-speed railway rails that achieves precise control of fill factor is provided.

[0006] The technical means employed in this invention are as follows:

[0007] A method for rolling 60N high-speed railway rails with precise control of rail fill, used to roll 60N rails that meet the fill requirements, includes the following steps:

[0008] S1: The steel section is passed through the UR rolling mill to obtain the intermediate rail. The maximum arc radius of the middle part of the rail head vertical roll of the UR rolling mill and the maximum arc radius of the middle part of the standard cross section tread of the 60N rail meet the first dimension requirement.

[0009] S2: Pass the intermediate rail through the UF rolling mill to obtain a 60N rail that meets the fullness requirements. The width of the UF rolling mill's pass head and the standard cross-sectional width of the 60N rail meet the second dimension requirement. The height of the UF rolling mill's pass head and the standard cross-sectional height of the 60N rail meet the third dimension requirement.

[0010] Furthermore, the expression for the first size requirement is as follows:

[0011]

[0012] in, This refers to the maximum radius of curvature of the middle section of the standard cross-section tread of a 60N steel rail. This refers to the maximum radius of the arc in the middle of the vertical roll pass of the UR rolling mill. This is the first difference that is set.

[0013] Furthermore, the first difference is 40~60mm.

[0014] Furthermore, the expression for the second dimension requirement is as follows:

[0015]

[0016] in, This refers to the width of the roll pass in the UF rolling mill. This refers to the standard head width dimension of a 60N steel rail. is the coefficient of thermal expansion of the steel section. This is the second difference.

[0017] Furthermore, the second difference is 0.1~0.2mm.

[0018] Furthermore, the expression for the third size requirement is as follows:

[0019]

[0020] in, This refers to the rail height dimensions of the UF rolling mill. This refers to the standard cross-sectional rail height dimensions of a 60N steel rail. is the coefficient of thermal expansion of the steel section. This is the third difference.

[0021] Furthermore, the third difference is 1.0~1.3mm.

[0022] Furthermore, the fullness requirement is -0.3 to +0.6 mm.

[0023] Furthermore, in step S2, the intermediate rail is first passed through a rolling mill to obtain a rolled intermediate rail, and then the rolled intermediate rail is passed through a UF rolling mill.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. This invention provides a method for rolling 60N high-speed railway rails to achieve precise control of rail fullness. Based on the principle of metal forming and the relationship between the dimensional accuracy of the finished rail fullness and the dimensional tolerances of the UR rolling mill rail head vertical roll profile and the UF rolling mill rail head profile, the fullness of the rail can be precisely controlled by rationally allocating the dimensions of each rolling mill profile.

[0026] 2. This invention avoids the problem of unreasonable metal quantity matching between UR rolling mill and UF rolling mill, and improves the dimensional accuracy of the finished rail fullness, which is particularly effective for controlling the dimensional accuracy of rail fullness for high-speed railway.

[0027] 3. Compared with the prior art, the present invention improves both the pass rate of rail fullness and the yield of rail rolling. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is an overall flowchart of a high-speed railway 60N steel rail rolling method for achieving precise control of fullness in this invention;

[0030] Figure 2 This is a standard cross-sectional view of the 60N steel rail in this invention;

[0031] Figure 3 This is a standard cross-sectional view of the roll pass of the UR rolling mill in this invention;

[0032] Figure 4 This is a standard cross-sectional view of the UF rolling mill pass in this invention. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0037] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0038] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0039] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0040] Example 1:

[0041] like Figures 1 to 4 As shown, a method for rolling 60N high-speed railway rails with precise control of fill degree is used to roll 60N rails that meet the fill degree requirements, including the following steps:

[0042] S1: The steel section is passed through the UR rolling mill to obtain the intermediate rail. The maximum arc radius of the middle part of the rail head vertical roll of the UR rolling mill and the maximum arc radius of the middle part of the standard cross section tread of the 60N rail meet the first dimension requirement.

[0043] S2: Pass the intermediate rail through the UF rolling mill to obtain a 60N rail that meets the fullness requirements. The width of the UF rolling mill's pass head and the standard cross-sectional width of the 60N rail meet the second dimension requirement. The height of the UF rolling mill's pass head and the standard cross-sectional height of the 60N rail meet the third dimension requirement.

[0044] In this embodiment, the expression for the first size requirement is as follows:

[0045]

[0046] in, This refers to the maximum radius of curvature of the middle section of the standard cross-section tread of a 60N steel rail. This refers to the maximum radius of the arc in the middle of the vertical roll pass of the UR rolling mill. This is the first difference that is set.

[0047] Specifically, the first difference is 40~60mm.

[0048] In this embodiment, the expression for the second size requirement is as follows:

[0049]

[0050] in, This refers to the width of the roll pass in the UF rolling mill. This refers to the standard head width dimension of a 60N steel rail. is the coefficient of thermal expansion of the steel section. This is the second difference.

[0051] Specifically, the second difference is 0.1~0.2mm, and the coefficient of thermal expansion of the steel section is 1.012~1.014.

[0052] In addition, the head width of the UF mill designed in this embodiment takes into account that the head width will increase by 0.1~0.2mm after straightening by the straightener.

[0053] In this embodiment, the expression for the third size requirement is as follows:

[0054]

[0055] in, This refers to the rail height dimensions of the UF rolling mill. This refers to the standard cross-sectional rail height dimensions of a 60N steel rail. is the coefficient of thermal expansion of the steel section. This is the third difference.

[0056] Specifically, the third difference is 1.0~1.3mm, and the thermal expansion coefficient of the steel section is 1.012~1.014.

[0057] In addition, the UF rolling mill designed in this embodiment has a margin of 0.7~0.8mm for the high pressure reduction of the straightening mill rail.

[0058] In this embodiment, the fullness requirement is -0.3 to +0.6 mm.

[0059] In this embodiment, in step S2, the intermediate rail is first passed through a rolling mill to obtain a rolled intermediate rail, and then the rolled intermediate rail is passed through a UF rolling mill.

[0060] According to the high-speed railway 60N rail rolling method for achieving precise control of fullness provided in this embodiment, the roll profiles of UR and UF rolling mills are designed. After the roll profiles are machined, the rails are rolled on the mills. During the adjustment of the roll gap, the roll gap G1 of the rail head vertical roll of the UR rolling mill and the roll gap G2 of the UF rolling mill cooperate with each other to ensure that the dimensional accuracy of the rail fullness is qualified.

[0061] Through numerous experiments and over a decade of stable production application, it has been found that, compared to existing technologies, using the method provided by this invention to roll rails can increase the rail fullness qualification rate from 62% to 95%.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for rolling 60N high-speed railway rails to achieve precise control of fill factor, characterized in that, The process for rolling 60N steel rails to meet fullness requirements includes the following steps: S1: The steel section is passed through the UR rolling mill to obtain the intermediate rail. The maximum arc radius of the middle part of the rail head vertical roll of the UR rolling mill and the maximum arc radius of the middle part of the standard cross section tread of the 60N rail meet the first dimension requirement. S2: Pass the intermediate rail through the UF rolling mill to obtain a 60N rail that meets the fullness requirement. The width of the UF rolling mill's pass head and the standard cross-sectional width of the 60N rail meet the second dimension requirement. The height of the UF rolling mill's pass head and the standard cross-sectional height of the 60N rail meet the third dimension requirement. The expression for the first size requirement is as follows: in, This refers to the maximum radius of curvature of the middle section of the standard cross-section tread of a 60N steel rail. This refers to the maximum radius of the arc in the middle of the vertical roll pass of the UR rolling mill. The first difference is set to be 40~60mm; The expression for the second dimension requirement is as follows: in, This refers to the width of the roll pass in the UF rolling mill. This refers to the standard head width dimension of a 60N steel rail. is the coefficient of thermal expansion of the steel section. The second difference is 0.1~0.2mm; The expression for the third dimension requirement is as follows: in, This refers to the rail height dimensions of the UF rolling mill. This refers to the standard cross-sectional rail height dimensions of a 60N steel rail. is the coefficient of thermal expansion of the steel section. The third difference is 1.0~1.3mm.

2. The method for rolling 60N high-speed railway rails with precise control of fill factor as described in claim 1, characterized in that, The required fullness is -0.3 to +0.6 mm.

3. The method for rolling 60N high-speed railway rails with precise control of fill factor as described in claim 1, characterized in that, In step S2, the intermediate rail is first passed through a rolling mill to obtain a rolled intermediate rail, and then the rolled intermediate rail is passed through a UF rolling mill.

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