A combined roller for an equal angle steel finishing rolling unit

Abstract

The utility model discloses a kind of combined roller for equal-leg angle steel finish rolling unit, belong to profile steel rolling technical field, including upper roll ring and lower roll ring. Upper roll ring includes the first inner tooth roll ring of forming recessed rolling surface and second inner tooth roll ring. Lower roll ring includes several outer tooth roll rings, and outer tooth roll ring forms the convex rolling surface opposite to corresponding recessed rolling surface. The material used for upper roll ring and lower roll ring is hard alloy. Through the combined design of upper roll recessed rolling surface and lower roll convex rolling surface, the rolling area of geometric complementation is formed, and the accurate forming of angle steel leg is realized. Compared with high-speed steel, hard alloy has better wear resistance and red hardness, thereby improving the rolling steel quantity and improving the surface quality of rolled product.

Description

Technical Field

[0001] This utility model belongs to the field of section steel rolling technology, specifically a combined roll for an equilateral angle steel precision rolling mill. Background Technology

[0002] In the field of metal rolling processing, section steel rolling technology has always been a key area of ​​technological research due to the difficulty in controlling the forming of complex cross-sectional shapes and the high requirements for dimensional accuracy. Among them, angle steel, as the most widely used section steel, plays an irreplaceable role in key areas such as power transmission towers, building steel structures, and engineering machinery connectors. With the increasing demands for weather resistance in end-use applications, angle steel products are subject to more stringent technical standards regarding dimensional symmetry, surface finish, and coating adhesion.

[0003] Currently, the industry commonly uses integral high-speed steel rolls for the precision rolling of angle steel, with typical operating temperatures controlled within the range of 950±30℃. While this technical solution meets basic production needs to a certain extent, it has revealed technical defects in actual industrial applications: First, the inherent wear resistance of the high-speed steel matrix is ​​insufficient, resulting in a consistently low steel throughput per roll and a significant hardness gradient distribution along the depth of the roll surface, causing a non-linear decay in forming accuracy during roll service. Second, the uneven wear mechanism leads to rapid deterioration of the groove profile, directly affecting the symmetry of the angle steel leg thickness and worsening the surface roughness of the product, significantly increasing the zinc consumption cost of subsequent galvanizing processes. Furthermore, frequent roll and groove changes not only reduce the effective operating rate but also keep the cost per ton of steel roll high, severely restricting the economic efficiency of the production line. Utility Model Content

[0004] The purpose of this utility model is to provide a combined roll for an equilateral angle steel finishing mill to solve the problems mentioned in the prior art.

[0005] A combined roll for an equilateral angle steel finishing mill is provided, comprising:

[0006] The upper roller ring includes a plurality of first internal tooth roller rings and a plurality of second internal tooth roller rings, wherein a single first internal tooth roller ring and a single second internal tooth roller ring cooperate to form an internal tooth mating group with a concave rolling surface.

[0007] The lower roll ring includes a plurality of external toothed roll rings, wherein the external toothed roll rings form a raised rolling surface opposite to the corresponding concave rolling surface;

[0008] The upper and lower roller rings are made of cemented carbide.

[0009] Furthermore, the upper roller ring also includes an upper roller spacer ring, which is clamped between two adjacent internal gear mating groups.

[0010] By replacing the upper roller spacer rings of different thicknesses, the groove spacing can be quickly adjusted to adapt to the production of angle steel of various specifications.

[0011] Furthermore, it also includes an upper roller shaft, wherein the upper roller ring is interference-fitted with the upper roller shaft.

[0012] The interference fit eliminates the need for a keyway structure, adapting to the brittle characteristics of carbide roll rings and avoiding edge cracks caused by keyway machining. The interference amount generates greater contact pressure, suppressing fretting wear and circumferential misalignment of the split roll rings under high-frequency rolling loads, and maintaining the symmetry of the angle steel leg ends.

[0013] Furthermore, the lower roller ring also includes a lower roller spacer ring, which is sandwiched between two adjacent outer toothed roller rings.

[0014] By replacing the lower roll spacer rings of different thicknesses, the groove spacing can be quickly adjusted to adapt to the production of various specifications of angle steel. The outer toothed roll ring is positioned by the lower roll spacer ring to ensure precise alignment between the raised rolling surface and the recessed rolling surface of the upper roll ring.

[0015] Furthermore, it also includes a lower roller shaft, wherein the lower roller ring is interference-fitted with the lower roller shaft.

[0016] The interference fit eliminates the need for a keyway structure, adapting to the brittle characteristics of carbide roll rings and avoiding edge cracks caused by keyway machining. The interference amount generates greater contact pressure, preventing circumferential misalignment of the outer toothed roll ring due to uneven rolling force, and maintaining the symmetry of the angle steel leg ends.

[0017] Furthermore, it also includes an upper roller shaft, a lower roller shaft, two upper roller limiting rings, and two lower roller limiting rings. The upper roller ring is sleeved around the upper roller shaft and limited between the two upper roller limiting rings, and the lower roller ring is sleeved around the lower roller shaft and limited between the two lower roller limiting rings.

[0018] By using the clamping and limiting rings of the upper and lower rolls, the rolling stability of the upper and lower roll rings is further improved, and axial displacement is avoided, which could lead to a loss of rolling precision.

[0019] Furthermore, there is an upper roller limiting ring integrally formed with the upper roller shaft, and there is an upper roller limiting ring that is detachably connected to the upper roller shaft.

[0020] The integrated upper roller limiting ring provides an axial assembly reference for the upper roller ring, while the detachable upper roller limiting ring provides an assembly channel for the upper roller ring and allows for individual replacement of worn roller ring units, reducing maintenance costs.

[0021] Furthermore, there is a lower roller limiting ring integrally formed with the lower roller shaft, and there is a lower roller limiting ring that is detachably connected to the lower roller shaft.

[0022] The integrated lower roller limiting ring provides an axial assembly reference for the lower roller ring, while the detachable lower roller limiting ring provides an assembly channel for the lower roller ring and allows for individual replacement of worn roller ring units, reducing maintenance costs.

[0023] Furthermore, the opposing surfaces between the upper roller limiting ring and the corresponding lower roller limiting ring form a roller gap adjusting oblique stop.

[0024] The roll gap adjustment ramps provide a reference plane and viewing angle for roll gap adjustment from the front and side directions of the combined rolls, ensuring a uniform and high-precision roll gap between the upper and lower rolls. This provides a basis for arranging multiple slot production lines along the length of the rolls and ensuring the forming accuracy of angle steel on each rolling line.

[0025] Furthermore, the upper and lower roller shafts are made of alloy structural steel.

[0026] Alloy structural steel has greater toughness, which is beneficial for roll bearings to withstand higher frequency alternating stress, and significantly improves rolling service life.

[0027] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0028] 1. By combining the concave rolling surface of the upper roll with the convex rolling surface of the lower roll, a geometrically complementary rolling zone is formed, achieving precise forming of the angle steel leg. Compared to high-speed steel, cemented carbide has better wear resistance and red hardness, thereby increasing the steel throughput and improving the surface quality of the finished rolled product.

[0029] 2. Because the upper roller forms a concave rolling surface, and the cemented carbide material is sintered, resulting in extremely high hardness and brittleness, the integrated concave surface and inner corner forming present challenges due to complex processing procedures and low forming accuracy. Therefore, the concave rolling surface of the upper roller ring is composed of two separate, relatively inclined first and second internal toothed roller rings. These two separate parts are directly molded, eliminating complex processing procedures and improving the forming accuracy of the concave rolling surface after mating. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this drawing 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 only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the overall structure of the combined rolls provided by this utility model.

[0032] In the diagram: 1. Upper roller ring; 11. First internal toothed roller ring; 12. Second internal toothed roller ring; 13. Upper roller spacer ring; 2. Lower roller ring; 21. External toothed roller ring; 22. Lower roller spacer ring; 3. Upper roller shaft; 4. Lower roller shaft; 5. Upper roller limiting ring; 6. Lower roller limiting ring; 7. Roll gap adjusting oblique stop. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0034] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0035] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0036] Please see Figure 1 As shown in the embodiment of this utility model, the combined roll for the equilateral angle steel finishing mill includes an upper roll ring 1 and a lower roll ring 2. The upper roll ring 1 includes a plurality of first internal tooth roll rings 11 and a plurality of second internal tooth roll rings 12, with a single first internal tooth roll ring 11 and a single second internal tooth roll ring 12 cooperating to form an internal tooth mating group with a concave rolling surface. The lower roll ring 2 includes a plurality of external tooth roll rings 21, with the external tooth roll rings 21 forming a convex rolling surface opposite to the corresponding concave rolling surface. The upper roll ring 1 and the lower roll ring 2 are made of cemented carbide.

[0037] The rolling mill rolls consist of an upper roll and a lower roll, with a roll gap formed between them. The upper roll is mainly composed of an upper roll ring 1 and an upper roll shaft 3, with the upper roll ring 1 fitted around the upper roll shaft 3. The lower roll is mainly composed of a lower roll ring 2 and a lower roll shaft 4, with the lower roll ring 2 fitted around the lower roll shaft 4.

[0038] The upper roller ring 1 is provided with several internal tooth mating groups along its length. Each internal tooth mating group consists of a first internal tooth roller ring 11 and a second internal tooth roller ring 12. The first internal tooth roller ring 11 and the second internal tooth roller ring 12 are separate hard alloy components that are molded and sintered separately. After mating on the upper roller shaft 3, they form a concave rolling surface, which is used to form the convex surface of the angle steel.

[0039] The lower roller ring 2 is provided with several external toothed roller rings 21 along its length. Each external toothed roller ring 21 is a single molded and sintered integral hard alloy component. After being fitted on the lower roller shaft 4, it forms a raised rolling surface. The raised rolling surface is used to form the concave surface of the angle steel.

[0040] Therefore, through the relative cooperation between the upper roller ring 1 and the lower roller ring 2, multiple rolling grooves formed by concave rolling surfaces and convex rolling surfaces are formed in the roll gap along the length direction of the upper roller shaft 3 and the lower roller shaft 4, thereby forming multiple angle steel rolling production lines.

[0041] The upper roller ring 1 and the lower roller ring 2 are made of cemented carbide. The binder phase content of the cemented carbide should be between 20% and 35%, and grades such as H20, H30, G40, G50, YG20, YG25, and YG30 can be selected.

[0042] Furthermore, the upper roll ring 1 also includes an upper roll spacer ring 13, which is sandwiched between two adjacent internal tooth mating groups. The upper roll spacer ring 13 is also made of cemented carbide. The spacing of each internal tooth mating group can be adjusted by using upper roll spacer rings 13 of different thicknesses, thereby adjusting the spacing of each groove.

[0043] Similarly, the lower roll ring 2 also includes a lower roll spacer ring 22, which is sandwiched between two adjacent outer toothed roll rings 21. The lower roll spacer ring 22 is also made of hard alloy material. The spacing of each outer toothed roll ring 21 can be adjusted by using lower roll spacer rings 22 with different thicknesses, while taking into account the thickness of the upper roll spacer ring 13, thereby adjusting the spacing of each groove.

[0044] In one embodiment, the upper roller ring 1 is interference-fitted with the upper roller shaft 3, and similarly, the lower roller ring 2 is interference-fitted with the lower roller shaft 4. The interference fit eliminates the need for a keyway structure, adapting to the brittle characteristics of the cemented carbide roller ring, avoiding machining of the cemented carbide roller ring, such as keyway cutting, protecting the integrity of the brittle material of the roller ring, and preventing the loss of surface hardness of the sintered cemented carbide.

[0045] The combined roll assembly also includes two upper roll limiting rings 5 ​​and two lower roll limiting rings 6. When the upper roll ring 1 is fitted around the upper roll shaft 3, it restricts the entire upper roll ring 1 between the two upper roll limiting rings 5. When the lower roll ring 2 is fitted around the lower roll shaft 4, it restricts the entire lower roll ring 2 between the two lower roll limiting rings 6. The upper roll ring 1 forms a rigid axial constraint at both ends of the upper roll shaft 3 through the two upper roll limiting rings 5, restricting the axial degree of freedom of the upper roll ring 1. The lower roll ring 2 forms a rigid axial constraint at both ends of the lower roll shaft 4 through the two lower roll limiting rings 6, restricting the axial degree of freedom of the lower roll ring 2.

[0046] Furthermore, there is an upper roller limiting ring 5 integrally formed with the upper roller shaft 3, and another upper roller limiting ring 5 detachably connected to the upper roller shaft 3. One upper roller limiting ring 5 is integrally formed with the upper roller shaft 3 by forging or casting, while the other upper roller limiting ring 5 is connected to the upper roller shaft 3 by a locking nut. The integral upper roller limiting ring 5 serves as an axial reference surface to ensure the initial installation accuracy of the upper roller ring 1 group; the detachable upper roller limiting ring 5 presses the upper roller ring 1 group with preload to achieve rapid assembly.

[0047] Similarly, one lower roller limiting ring 6 is integrally formed with the lower roller shaft 4, and another lower roller limiting ring 6 is detachably connected to the lower roller shaft 4. One lower roller limiting ring 6 and the lower roller shaft 4 are integrally formed by forging or casting, while the other lower roller limiting ring 6 is connected to the lower roller shaft 4 by a locking nut. The integral lower roller limiting ring 6 serves as an axial reference surface to ensure the initial installation accuracy of the lower roller ring 2 assembly; the detachable lower roller limiting ring 6 uses preload to press the lower roller ring 2 assembly, enabling rapid assembly.

[0048] The opposing surfaces of the upper roll limiting ring 5 and the corresponding lower roll limiting ring 6 form a roll gap adjusting oblique stop 7. The roll gap adjusting oblique stops 7 on both sides of the roll consist of an inclined roll gap and a horizontally extending roll gap, respectively, wherein the angle between the inclined roll gap and the horizontal plane can be 5° to 20°. The horizontally extending roll gap provides a reference for adjusting the actual vertical deviation of the roll gap on the side of the roll, ensuring the consistency of the vertical spacing throughout the roll gap; the inclined extending roll gap provides a reference for adjusting the actual horizontal deviation of the roll gap on the front of the roll, controlling the horizontal offset of the upper and lower rolls, so that the concave tip of the concave rolling surface and the convex tip of the convex rolling surface are precisely aligned.

[0049] The upper roller shaft 3 and the lower roller shaft 4 are made of alloy structural steel. Alloy structural steel has high impact toughness, forming a rigid-flexible composite structure with the high hardness of the hard alloy roller ring. The alloy structural steel grades that can be selected are 40Cr, 35CrMo, 42CrMo, 20CrMnTi, etc.

[0050] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A combined roll for an equilateral angle steel finishing mill, characterized in that, include: The upper roller ring (1) includes a plurality of first internal tooth roller rings (11) and a plurality of second internal tooth roller rings (12), wherein a single first internal tooth roller ring (11) and a single second internal tooth roller ring (12) cooperate to form an internal tooth mating group with a concave rolling surface; The lower roll ring (2) includes a plurality of external toothed roll rings (21), wherein the external toothed roll rings (21) form a raised rolling surface opposite to the corresponding concave rolling surface; The upper roller ring (1) and the lower roller ring (2) are made of cemented carbide.

2. The combined roll for an equilateral angle steel finishing mill according to claim 1, characterized in that, The upper roller ring (1) also includes an upper roller spacer ring (13), which is held between two adjacent internal gear sets.

3. A combined roll for an equilateral angle steel finishing mill according to claim 2, characterized in that, It also includes an upper roller shaft (3), wherein the upper roller ring (1) is interference-fitted with the upper roller shaft (3).

4. A combined roll for an equilateral angle steel finishing mill according to claim 1, characterized in that, The lower roller ring (2) also includes a lower roller spacer ring (22), which is sandwiched between two adjacent external toothed roller rings (21).

5. A combined roll for an equilateral angle steel finishing mill according to claim 4, characterized in that, It also includes a lower roller shaft (4), wherein the lower roller ring (2) is interference-fitted with the lower roller shaft (4).

6. A combined roll for an equilateral angle steel finishing mill according to claim 1, characterized in that, It also includes an upper roller shaft (3), a lower roller shaft (4), two upper roller limiting rings (5) and two lower roller limiting rings (6). The upper roller ring (1) is sleeved around the upper roller shaft (3) and limited between the two upper roller limiting rings (5). The lower roller ring (2) is sleeved around the lower roller shaft (4) and limited between the two lower roller limiting rings (6).

7. A combined roll for an equilateral angle steel finishing mill according to claim 6, characterized in that, There is an upper roller limiting ring (5) integrally formed with the upper roller shaft (3), and there is an upper roller limiting ring (5) detachably connected with the upper roller shaft (3).

8. A combined roll for an equilateral angle steel finishing mill according to claim 6, characterized in that, There is a lower roller limiting ring (6) integrally formed with the lower roller shaft (4), and there is a lower roller limiting ring (6) detachably connected with the lower roller shaft (4).

9. A combined roll for an equilateral angle steel finishing mill according to claim 6, characterized in that, The opposing surfaces between the upper roller limiting ring (5) and the corresponding lower roller limiting ring (6) form a roller gap adjusting oblique stop (7).

10. A combined roll for an equilateral angle steel finishing mill according to claim 6, characterized in that, The upper roller shaft (3) and the lower roller shaft (4) are made of alloy structural steel.

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