A thrust wheel and a structure using the same

Abstract

The utility model discloses a kind of thrust wheel and the structure of application this thrust wheel, belong to cold rolling mill technical field, the working surface of thrust wheel is the closed surface formed by the continuous movement of generatrix around the axis of thrust wheel in space, and working surface is with working roll point contact.Thrust structure is used to limit the working roll in eighteen roll mill, and thrust structure includes: the above thrust wheel, thrust wheel is located at the axial two sides of working roll;And mounting seat, mounting seat is used to support thrust wheel, so that thrust wheel and working roll point contact.This application is optimized to the working surface of thrust wheel, and the working surface of thrust wheel is the closed surface formed by the continuous movement of generatrix around the axis of thrust wheel in space, when using, the working surface of thrust wheel and working roll point contact, this contact mode solves the linear contact between thrust wheel and working roll in prior art, and there is friction, leading to the problem of wear and tear of thrust wheel and working roll, prolongs the service life of thrust wheel.

Description

Technical Field

[0001] This utility model belongs to the field of cold rolling mill technology, and relates to a thrust wheel and a structure using the thrust wheel. Background Technology

[0002] In an 18-roll cold rolling mill, the stop roller is mainly used to bear and limit the axial force of the rolls, ensuring that the rolls can maintain the correct position and axial stability during the rolling process, preventing the work rolls from moving axially, and ensuring production accuracy.

[0003] The specific reasons affecting the service life of the thrust wheel are as follows: I. Causes of Wear: 1) In existing technology, the thrust roller and work roll have line contact and friction exists. 2) The incoming strip may have wedge-shaped bulges, sickle bends, etc. When encountering wedge-shaped or sickle bends during rolling, the rolls will generate asymmetrical pressure distribution and axial force under high pressure, causing excessive load on the work roll and thrust roller bearings, thus accelerating wear. 3) Factors such as improper adjustment of bent rolls, tilting, rolling neutral line, and improper radial angle between the side support and the work roll can all increase axial stress, leading to wear of the work roll and thrust roller.

[0004] II. Causes of Erosion: 1) Material properties and lubrication issues are among the important factors leading to thrust wheel erosion. Emulsion system malfunctions, nozzle blockage, insufficient hydraulic pressure, and poor oil quality can all prevent the thrust wheel from forming a good oil film under high loads, resulting in direct contact between the metal surfaces, generating a large amount of heat, and thus causing erosion. 2) Whether the thrust wheel's structure is reasonable and whether its installation is in place are also important factors causing erosion.

[0005] Therefore, it is necessary to provide a rolling mill thrust wheel with a long service life. Utility Model Content

[0006] To at least solve the problem of line contact and friction between the thrust wheel and the work roller in the prior art, which leads to wear of both the thrust wheel and the work roller, this utility model provides the following technical solution: a thrust wheel, wherein the working surface of the thrust wheel is a closed curved surface formed by the continuous spatial movement of a generatrix around the axis of the thrust wheel, and the working surface is in point contact with the work roller; the generatrix is ​​an arc bending outward from the thrust wheel.

[0007] Optionally, in the aforementioned thrust roller, the midpoint of the arc contacts the working roller.

[0008] Optionally, in the aforementioned thrust wheel, the radius R of the arc ranges from 180 mm to 200 mm; and The angle n of the arc is in the range of 45° to 55°.

[0009] Optionally, in the aforementioned thrust wheel, the hardness HRC of the working surface is 58.0 to 60.0.

[0010] Optionally, in the above-described thrust wheel, the thrust wheel has a central hole for mounting a bearing.

[0011] This utility model also provides the following technical solution: a thrust-stop structure, which is used to limit the movement of work rolls in an 18-roll mill, the thrust-stop structure comprising: As described above, the thrust rollers are located on both axial sides of the work roller; and Mounting base, the mounting base is used to support the thrust wheel so that the thrust wheel makes point contact with the work roller.

[0012] Optionally, in the above-described thrust structure, the mounting base has a mounting groove for accommodating the thrust wheel; The thrust wheel is rotatably connected to the first connection position and the second connection position of the mounting base, respectively. The first connection position and the second connection position are distributed on both sides of the mounting groove.

[0013] Optionally, in the above-described thrust structure, the thrust wheel is connected to the mounting base via a rotating shaft.

[0014] Optionally, in the above-described thrust structure, the thrust wheel is arranged perpendicular to the work roller; and Two thrust wheels are connected in series inside the mounting base.

[0015] The beneficial effects of the technical solution provided by this utility model embodiment are: This application optimizes the working surface of the thrust wheel. The working surface of the thrust wheel is a closed curved surface formed by the continuous spatial movement of the generatrix around the axis of the thrust wheel. During use, the working surface of the thrust wheel makes point contact with the working roller. This contact method solves the problem of line contact and friction between the thrust wheel and the working roller in the prior art, which leads to wear of the thrust wheel and the working roller, and extends the service life of the thrust wheel. Attached Figure Description

[0016] Figure 1 A schematic diagram of the main structure of a thrust wheel provided in an embodiment of this utility model; Figure 2 A top view of a thrust wheel provided for an embodiment of this utility model; Figure 3 A three-dimensional structural diagram of a thrust wheel provided for an embodiment of this utility model; Figure 4 A top view of a thrust-stop structure provided in an embodiment of this utility model; Figure 5 This is a schematic diagram of the main structure of a thrust-stopping structure provided in an embodiment of the present utility model; Figure 6 This is a schematic diagram showing the position of the work rolls in an 18-roll cold rolling mill in the prior art. In the diagram: 1. Thrust wheel; 11. Working surface; 12. Center hole; 2. Mounting base; 21. Placement groove; 22. First connection position; 23. Second connection position; 3. Working roller; 4. Rotating shaft. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0018] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0019] Please see Figure 1-6 This utility model provides the following technical solution: a thrust wheel, wherein the working surface 11 of the thrust wheel 1 is a closed curved surface formed by the continuous spatial movement of a generatrix around the axis of the thrust wheel 1. The specific profile of the generatrix is ​​not limited in this embodiment. It can be understood that the working surface 11 is actually the outer wall of the thrust wheel 1, which makes point contact with the working roller 3. This contact method solves the problem in the prior art where there is line contact and friction between the thrust wheel 1 and the working roller 3, leading to wear of both the thrust wheel 1 and the working roller 3, thus extending the service life of the thrust wheel 1.

[0020] As an embodiment of the specific structure of the aforementioned busbar, in this embodiment, the busbar is an arc (i.e., Figure 1 The arc AB shown is curved outwards from the thrust wheel 1. Preferably, the midpoint of the arc contacts the work roller 3, thus reducing the contact area between the arc and the work roller 3 and achieving point contact.

[0021] As an example of the specific parameters of the aforementioned arc, in this embodiment, the radius R of the arc ranges from 180 mm to 200 mm, for example, 180 mm, 181 mm, 182 mm, 183 mm, 184 mm, 185 mm, 186 mm, 187 mm, 188 mm, 189 mm, 190 mm, 191 mm, 192 mm, 193 mm, 194 mm, 195 mm, 196 mm, 197 mm, 198 mm, 199 mm, 200 mm. Other values ​​can be used, such as 190.1 mm; the range of the arc angle n is 45° to 55°, such as 45°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, or other values, such as 50.1°, which is beneficial for forming a micro-arc working surface 11. This will not make too much change to the shape of the thrust wheel 1, and will also enable the thrust wheel 1 to make point contact with the working roller 3.

[0022] Traditional thrust wheels 1 are made of medium-carbon alloy structural steel (such as 42CrMo, 38CrMoAl, etc.) or carburized steel (such as 20CrMnTi). These materials require surface hardening treatment (such as nitriding, carburizing, quenching) before use, and are prone to problems such as inadequate heat treatment, deformation, and overheating during use. To avoid the above problems, the thrust wheel 1 of this application is made of high-carbon chromium bearing steel, and its main components and functions are as follows: 1) Carbon (C): 0.9%~1.1%, ensuring high hardness and wear resistance. 2) Chromium (Cr): 1.35%~1.55%, forming carbides to improve corrosion resistance and wear resistance. 3) Manganese (Mn), Silicon (Si): ≤0.25%, assisting in strengthening the matrix and improving toughness. 4) Impurity elements: Phosphorus (P) ≤0.015%, Sulfur (S) ≤0.010%, controlling harmful elements to avoid brittleness.

[0023] The new thrust wheel was put into trial use on the production line. The data collected by the on-site staff is as follows: Table 1: Hardness test results of thrust wheel Table 2: Thrust Wheel Consumption Status As can be seen from Table 1, the hardness of the new thrust wheel is lower than that of the original (old) thrust wheel. The hardness HRC of the working surface 11 of the new thrust wheel is 58.0 to 60.0.

[0024] As can be seen from Table 2, the new thrust wheel is significantly improved in durability and stability compared to the original (old) thrust wheel.

[0025] It should be noted that test production line 1 is a two-roll, eighteen-roll mill (with eight thrust rollers operating simultaneously), while test production line 2 is a three-roll, eighteen-roll mill (with twelve thrust rollers operating simultaneously). The main reason for the decrease in the number of damaged work rolls in test production line 1 in July of last year and test production line 2 in August of last year is that the frequency of manual inspection of the (grinding) thrust rollers was increased during these two months. When abnormalities were found in the thrust rollers, rolling was stopped and the rollers were replaced immediately, thus preventing the damage to the work rolls.

[0026] According to feedback from on-site staff, only a small number of old-type thrust rollers have a service life of more than one month, while most old-type thrust rollers will be damaged within a week. In fact, when the rolling mill is in poor working condition, it is common to replace them every one or two days.

[0027] Studies have found that, under normal circumstances, most new thrust rollers can be replaced every 2 to 3 months. Compared with the old type of thrust rollers that need to be replaced frequently, the economic benefits of using new thrust rollers are significantly improved, and the labor intensity of machine repair is also reduced.

[0028] See Figure 2 and Figure 3 As shown, the thrust wheel 1 has a center hole 12 for mounting the bearing.

[0029] This utility model also provides the following technical solution: a thrust-stop structure for limiting the position of the work roll 3 in an 18-roll cold rolling mill. The thrust-stop structure includes: a thrust wheel 1 and a mounting base 2. Specifically, the thrust wheel 1 is as described above, and the thrust wheels 1 are located on both axial sides of the work roll 3, that is, the number of thrust wheels 1 is twice the number of work rolls 3. Preferably, see [reference needed]. Figure 4 and Figure 5 As shown, the thrust wheel 1 is set perpendicular to the work roller 3, so that the thrust wheel 1 can play a limiting role. The mounting base 2 is used to support the thrust wheel 1, so that the thrust wheel 1 is in point contact with the work roller 3.

[0030] As an embodiment of the specific structure of the mounting base 2 described above, in this embodiment, the mounting base 2 has a mounting groove 21 for accommodating the thrust wheel 1. The thrust wheel 1 is rotatably connected to the first connecting position 22 and the second connecting position 23 of the mounting base 2, respectively; see reference. Figure 4 As shown, the first connecting position 22 and the second connecting position 23 are distributed on both sides of the mounting groove 21. Preferably, the thrust wheel 1 is connected to the mounting base 2 via a rotating shaft 4. That is, after the thrust wheel 1 is mounted on the rotating shaft 4 via a bearing, one end of the rotating shaft 4 is connected to the first connecting position 22 of the mounting base 2, and the other end of the rotating shaft 4 is connected to the second connecting position 23 of the mounting base 2. In this way, the thrust wheel 1 can rotate along the rotating shaft 4 within the mounting groove 21 of the mounting base 2.

[0031] Reference Figure 4As shown, two thrust wheels 1 are installed in the mounting base 2. Specifically, the two thrust wheels 1 are connected in series on the same rotating shaft 4, so that the two thrust wheels 1 can rotate in the same direction.

[0032] See the position of work roller 3. Figure 6 The figure shows a partial structural diagram of an 18-roll cold rolling mill. Arrows from left to right indicate the strip rolling direction. Number 3 is the work roll, number 5 is the intermediate roll, number 6 is the side support roll, number 7 is the swing arm, and number 8 is the backing bearing roll (mainly used to improve the rigidity of the support roll). The side support roll 6 and the backing bearing roll 8 are fixed together in the side support roll box as a single unit. The side support roll 6, intermediate roll 5, and work roll 3 are all mirror-perpendicular to the mill's centerline. The intermediate roll 5 and work roll 3 form a vertical limit; the side support roll 6 and work roll 3 form a limit along the strip length direction. (See also...) Figure 4 and Figure 5 The thrust roller 1 and the work roll 3 form a limit in the width direction of the steel strip (the thrust roller 1 only has rolling freedom). The work roll 3 has a certain amount of free movement in the width direction of the steel strip. Whether it moves towards the operating side or the transmission side is affected by the balance of the roll system, the shape of the incoming plate, the tilt adjustment, the horizontal component of the rolling force, and whether the emulsion cooling is uniform. For example, if the side support roller 6 is tilted by 1 degree, it may generate 3-5 tons of axial force under a vertical rolling force of 10-13 meganewtons.

[0033] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A thrust wheel, characterized in that, The working surface of the thrust wheel is a closed curved surface formed by the continuous spatial movement of the generatrix around the axis of the thrust wheel, and the working surface is in point contact with the working roller; the generatrix is ​​an arc that bends outward from the thrust wheel.

2. The thrust wheel according to claim 1, characterized in that, The midpoint of the arc contacts the work roller.

3. The thrust wheel according to claim 1, characterized in that, The radius R of the arc is in the range of 180 mm to 200 mm; and The angle n of the arc is in the range of 45° to 55°.

4. The thrust wheel according to claim 1, characterized in that, The hardness (HRC) of the working surface is 58.0–60.

0.

5. The thrust wheel according to claim 1, characterized in that, The thrust wheel has a central hole for mounting the bearing.

6. A thrust-stopping structure, characterized in that, The thrust stop structure is used to limit the movement of the work rolls in an 18-roll mill. The thrust stop structure includes: The thrust roller as described in any one of claims 1-5, wherein the thrust roller is located on both axial sides of the work roller; and Mounting base, the mounting base is used to support the thrust wheel so that the thrust wheel makes point contact with the work roller.

7. The thrust-stopping structure according to claim 6, characterized in that, The mounting base has a mounting groove for accommodating the thrust wheel; The thrust wheel is rotatably connected to the first connection position and the second connection position of the mounting base, respectively. The first connection position and the second connection position are distributed on both sides of the mounting groove.

8. The thrust-stopping structure according to claim 6, characterized in that, The thrust wheel is connected to the mounting base via a rotating shaft.

9. The thrust-stopping structure according to claim 6, characterized in that, The thrust wheel is arranged perpendicular to the work roller; and Two thrust wheels are connected in series inside the mounting base.

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