High-speed railway 60N steel rail rolling method capable of achieving accurate plumpness control

Abstract

The invention relates to the technical field of railway steel rail production processes, and provides a high-speed railway 60N steel rail rolling method capable of realizing accurate plumpness control, which is used for rolling a 60N steel rail meeting the plumpness requirement and comprises the following steps: enabling profile steel to pass through a UR rolling mill to obtain an intermediate steel rail, the maximum arc radius of the middle part of the rail head vertical roll hole pattern of the UR rolling mill and the maximum arc radius of the middle part of the standard section tread of the 60N steel rail meet the first size requirement; the intermediate steel rail passes through a UF rolling mill, the 60N steel rail meeting the plumpness requirement is obtained, the hole pattern head width size of the UF rolling mill and the standard section head width size of the 60N steel rail meet the second size requirement, and the hole pattern rail height size of the UF rolling mill and the standard section rail height size of the 60N steel rail meet the third size requirement. The plumpness of the steel rail can be accurately controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of railway rail production technology, and in particular to a high-speed railway 60N rail rolling method for achieving precise fullness control. Background Art

[0002] At present, the universal mill for rolling rails usually consists of UR, E and UF rolling mills, which perform three reciprocating rolling passes to produce finished rails.

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

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

[0005] In response to the technical problems raised above, a method for rolling 60N rails for high-speed railways is provided for achieving precise control of the fullness.

[0006] The technical means adopted in the present invention are as follows: A high-speed railway 60N rail rolling method for achieving precise fullness control, for rolling a 60N rail meeting fullness requirements, comprising the following steps: S1: passing the section steel through a UR rolling mill to obtain an intermediate rail, wherein the maximum arc radius of the middle portion of the rail head vertical roller pass of the UR rolling mill and the maximum arc radius of the middle portion of the standard section tread of a 60N rail meet the first dimension requirement; S2: The intermediate rail is passed through a UF rolling mill to obtain a 60N rail that meets the fullness requirement. The hole head width dimension of the UF rolling mill and the standard section head width dimension of the 60N rail meet the second size requirement. The hole rail height dimension of the UF rolling mill and the standard section rail height dimension of the 60N rail meet the third size requirement.

[0007] Furthermore, the expression of the first size requirement is as follows:

[0008] in, The maximum arc radius in the middle of the tread of the standard section of the 60N rail is It is the maximum arc radius in the middle part of the rail head vertical roller hole of the UR rolling mill. is the first difference value set.

[0009] Furthermore, the first difference is 40-60 mm.

[0010] Furthermore, the expression of the second size requirement is as follows:

[0011] in, is the width of the hole head of the UF rolling mill, It is the standard cross-section head width of 60N rail. is the thermal expansion coefficient of the steel, is the second difference.

[0012] Furthermore, the second difference is 0.1-0.2 mm.

[0013] Furthermore, the expression of the third size requirement is as follows:

[0014] in, The height of the hole rail of the UF rolling mill is The standard section height of 60N rails. is the thermal expansion coefficient of the steel, The third difference.

[0015] Furthermore, the third difference is 1.0-1.3 mm.

[0016] Furthermore, the fullness requirement is -0.3~+0.6mm.

[0017] Furthermore, in said S2, the intermediate steel rail is first passed through an edge rolling mill to obtain an edge rolled intermediate steel rail, and then the edge rolled intermediate steel rail is passed through a UF rolling mill.

[0018] Compared with the prior art, the present invention has the following advantages: 1. The present invention provides a method for rolling 60N high-speed railway rails that achieves precise control of rail fullness. Based on the principles of metal forming and the fact that the dimensional accuracy of the rail fullness of the finished rail is related to the dimensional tolerances of the rail head vertical roller pass of the UR rolling mill and the rail head pass of the UF rolling mill, precise control of the rail fullness is achieved by rationally allocating the pass sizes of each rolling mill.

[0019] 2. The present invention avoids the problem of unreasonable metal quantity matching between the UR rolling mill and the UF rolling mill, improves the fullness dimensional accuracy of the finished rail, and is particularly effective in controlling the fullness dimensional accuracy of the rails for high-speed railways.

[0020] 3. Compared with the prior art, the present invention not only improves the qualified rate of rail fullness, but also improves the yield rate of rail rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 This is an overall flow chart of a high-speed railway 60N rail rolling method for achieving precise fullness control in the present invention; Figure 2 This is a standard cross-sectional view of a 60N rail in the present invention; Figure 3 It is a standard cross-sectional view of the pass type of the UR rolling mill in the present invention; Figure 4 It is a standard cross-sectional view of the pass type of the UF rolling mill in the present invention. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0027] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0028] For ease of description, spatially relative terms such as "above," "above," "on the upper surface of," and "above" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" another device or structure would then be positioned as "below" or "below" the other device or structure. Thus, the exemplary term "above" may include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0030] Example 1: like Figures 1 to 4 As shown, a high-speed railway 60N rail rolling method for achieving precise fullness control is used to roll a 60N rail that meets fullness requirements, comprising the following steps: S1: passing the section steel through a UR rolling mill to obtain an intermediate rail, wherein the maximum arc radius of the middle portion of the rail head vertical roller pass of the UR rolling mill and the maximum arc radius of the middle portion of the standard section tread of a 60N rail meet the first dimension requirement; S2: The intermediate rail is passed through a UF rolling mill to obtain a 60N rail that meets the fullness requirement. The hole head width dimension of the UF rolling mill and the standard section head width dimension of the 60N rail meet the second size requirement. The hole rail height dimension of the UF rolling mill and the standard section rail height dimension of the 60N rail meet the third size requirement.

[0031] In this embodiment, the expression of the first size requirement is as follows:

[0032] in, The maximum arc radius in the middle of the tread of the standard section of the 60N rail is It is the maximum arc radius in the middle part of the rail head vertical roller hole of the UR rolling mill. is the first difference value set.

[0033] Specifically, the first difference is 40-60 mm.

[0034] In this embodiment, the expression of the second size requirement is as follows:

[0035] in, is the width of the hole head of the UF rolling mill, It is the standard cross-section head width of 60N rail. is the thermal expansion coefficient of the steel, is the second difference.

[0036] Specifically, the second difference is 0.1-0.2 mm, and the thermal expansion coefficient of the steel section is 1.012-1.014.

[0037] In addition, the hole head width dimension of the UF rolling mill designed in this embodiment takes into account that the head width will increase by 0.1-0.2 mm after straightening by the straightening machine.

[0038] In this embodiment, the expression of the third size requirement is as follows:

[0039] in, The height of the hole rail of the UF rolling mill is The standard section height of 60N rails. is the thermal expansion coefficient of the steel, The third difference.

[0040] Specifically, the third difference is 1.0-1.3 mm, and the thermal expansion coefficient of the steel section is 1.012-1.014.

[0041] In addition, the hole rail height dimension of the UF rolling mill designed in this embodiment leaves a margin of 0.7-0.8 mm for the high pressure reduction of the straightening machine rail.

[0042] In this embodiment, the fullness requirement is -0.3~+0.6mm.

[0043] In this embodiment, in S2, the intermediate steel rail is first passed through an edge rolling mill to obtain an edge-rolled intermediate steel rail, and then the edge-rolled intermediate steel rail is passed through a UF rolling mill.

[0044] According to a high-speed railway 60N rail rolling method for achieving precise fullness control provided in this embodiment, the pass profiles of the UR rolling mill and the UF rolling mill are designed. After the roll pass profile is turned, the rolling is carried out on the machine. During the roll gap adjustment process of the rolling mill, the rail head vertical roll gap G1 of the UR rolling mill and the horizontal roll gap G2 of the UF rolling mill cooperate with each other to ensure that the fullness dimensional accuracy of the rails meets the requirements.

[0045] After many experiments and more than ten years of stable production application, it can be known that compared with the existing technology, the qualified rate of rail fullness can be increased from 62% to 95% when rolling rails using the method provided by the present invention.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 high-speed railway 60N rail rolling method for achieving precise fullness control, characterized in that: The process for rolling a 60N rail that meets fullness requirements includes the following steps: S1: passing the section steel through a UR rolling mill to obtain an intermediate rail, wherein the maximum arc radius of the middle portion of the rail head vertical roller pass of the UR rolling mill and the maximum arc radius of the middle portion of the standard section tread of a 60N rail meet the first dimension requirement; S2: The intermediate rail is passed through a UF rolling mill to obtain a 60N rail that meets the fullness requirement. The hole head width dimension of the UF rolling mill and the standard section head width dimension of the 60N rail meet the second size requirement. The hole rail height dimension of the UF rolling mill and the standard section rail height dimension of the 60N rail meet the third size requirement.

2. A high-speed railway 60N rail rolling method for achieving precise fullness control according to claim 1, characterized in that: The expression for the first size requirement is as follows: in, The maximum arc radius in the middle of the tread of the standard section of the 60N rail is It is the maximum arc radius in the middle part of the rail head vertical roller hole of the UR rolling mill. is the first difference value set.

3. A high-speed railway 60N rail rolling method for achieving precise fullness control according to claim 2, characterized in that: The first difference is 40-60 mm.

4. The method for rolling a 60N high-speed railway rail with precise fullness control according to claim 1, characterized in that: The expression for the second size requirement is as follows: in, is the width of the hole head of the UF rolling mill, It is the standard cross-section head width of 60N rail. is the thermal expansion coefficient of the steel, is the second difference.

5. The method for rolling a 60N high-speed railway rail for achieving precise fullness control according to claim 4, characterized in that: The second difference is 0.1-0.2 mm.

6. The method for rolling a 60N high-speed railway rail with precise fullness control according to claim 1, characterized in that: The expression of the third dimension requirement is as follows: in, The height of the hole rail of the UF rolling mill is The standard section height of 60N rails. is the thermal expansion coefficient of the steel, The third difference.

7. A high-speed railway 60N rail rolling method for achieving precise fullness control according to claim 6, characterized in that: The third difference is 1.0-1.3 mm.

8. The method for rolling a 60N high-speed railway rail with precise fullness control according to claim 1, characterized in that: The fullness requirement is -0.3~+0.6mm.

9. The method for rolling a 60N high-speed railway rail with precise fullness control according to claim 1, characterized in that: In the above-mentioned S2, the intermediate steel rail is first passed through the edge rolling mill to obtain the edge rolled intermediate steel rail, and then the edge rolled intermediate steel rail is passed through the UF rolling mill.

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