Roll neck repair with insert ring
By installing an inner ring structure at the roll neck, the problem of short bearing life is solved, enabling efficient repair and sustainable use of the roll, and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANXI TAIGANG STAINLESS STEEL CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-06-23
AI Technical Summary
Damage to the roll neck area causes the bearing life to be shorter than the roll life, and the repair process cannot meet the hardness requirements, resulting in a large number of roll damages and production difficulties.
By trimming the roll neck and fitting the first and second inner rings, the inner rings are pressurized to fit the trimmed roll neck through a hot assembly process, forming an inner ring inlay structure, thus enabling the roll neck to be replaced and repaired.
It improves the service life of the roll neck, reduces repair costs, realizes sustainable utilization of the roll throughout its entire life cycle, and solves the problem of roll retention.
Smart Images
Figure CN224389596U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of abnormal repair of rolls with specific functions, and relates to an inner ring structure for repairing specific roll necks of rolls. Background Technology
[0002] The 18-roll mill is a crucial unit for Taiyuan Iron & Steel Group (TISCO) in rolling stainless steel cold-rolled sheets, boasting advantages such as high control precision. Due to its high roll system integration, the intermediate rolls employ a design where the roll neck acts as the inner sleeve of the bearing, a design intended to reduce bearing costs.
[0003] However, a new problem arose during the assembly and use of the rolls and has plagued the industry for many years: the bearing life is shorter than the roll life, and bearing failure damages the roll neck, leading to extensive abnormal damage to the rolls and preventing them from reaching their normal service life. Attempts were made to repair the roll neck using laser cladding technology, but the localized heat treatment during the process failed to meet the technical requirements for hardness and other aspects of the roll neck, resulting in the failure of the repair process.
[0004] During the production process, a large number of rolls are left on site due to abnormal damage to the roll neck, causing difficulties in production and supply and a significant increase in roll consumption. There is an urgent need to propose an effective repair structure to solve this problem. Utility Model Content
[0005] To overcome the deficiencies in the aforementioned related technologies, this utility model proposes an inner ring structure for repairing specific roll necks of rolling mills.
[0006] To achieve the above technical objectives, this utility model provides an inner ring structure for repairing specific roll necks, applicable to rolls with damaged roll neck surfaces. The inner ring structure for repairing specific roll necks includes:
[0007] The trimmed roll neck is formed by cutting a damaged roll neck.
[0008] The first inner ring is a tubular component. The outer diameter of the first inner ring is the same as the diameter of the roll neck of the rolling mill. The inner diameter of the first inner ring is interference-fitted with the diameter of the dressing roll neck. The first inner ring is fitted onto the dressing roll neck.
[0009] The second inner ring is a tubular component. The outer diameter of the second inner ring is the same as the diameter of the roll neck. The inner diameter of the second inner ring is interference-fitted with the diameter of the dressing roll neck. The sum of the lengths of the first inner ring and the second inner ring is the same as the length of the roll neck. The second inner ring is fitted onto the dressing roll neck.
[0010] Preferably, the first inner ring and the second inner ring are fitted onto the trimming roller neck using a thermal assembly process.
[0011] Preferably, the first inner ring and the second inner ring have the same length.
[0012] Preferably, the thickness is 7.9 mm and the quenching hardness is 58-64 HRC.
[0013] Preferably, the diameter of the trimming roller neck is ø254.2mm (+0.08, +0.109).
[0014] Preferably, the outer diameter of the first inner ring and the second inner ring is 270 mm.
[0015] The beneficial effects of the utility model are as follows:
[0016] The repair channel for the characteristic roll neck, which is used as a bearing inner sleeve, was opened up, thus solving the problem of roll retention.
[0017] This makes the repair of rolls with such neck damage highly effective, low-cost, and easy to operate.
[0018] The replaceability of the inner sleeve enables sustainable repair, thereby realizing the utilization value of the roll throughout its entire life cycle.
[0019] By adopting the method of this utility model, the repair of the characteristic rolls that make the roll neck act as the inner sleeve of the bearing can be cost-effective and efficient, and the roll life can be increased from 50% to 100%, ensuring the sustainable repair and use of the roll throughout its entire life cycle. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a structural diagram of the present invention. Detailed Implementation
[0022] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0023] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.
[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0025] like Figure 1 As shown, this utility model provides an inner ring structure for repairing specific roll necks of rolling mills, applied to rolling mills with damaged roll neck surfaces. The inner ring structure for repairing specific roll necks of rolling mills includes:
[0026] Trimmed roll neck 1, wherein the trimmed roll neck 1 is formed by cutting a damaged roll neck;
[0027] The first inner ring 2 is a tubular component. The outer diameter of the first inner ring 2 is the same as the diameter of the roll neck of the roll. The inner diameter of the first inner ring 2 is interference-fitted with the diameter of the dressing roll neck 1. The first inner ring 2 is fitted onto the dressing roll neck 1.
[0028] The second inner ring 3 is a tube. The outer diameter of the second inner ring 3 is the same as the diameter of the roll neck. The inner diameter of the second inner ring 3 is interference-fitted with the diameter of the dressing roll neck 1. The sum of the lengths of the first inner ring 2 and the second inner ring 3 is the same as the length of the roll neck. The second inner ring 3 is fitted onto the dressing roll neck 1.
[0029] Preferably, the first inner ring 2 and the second inner ring 3 are fitted onto the trimming roller neck 1 by a heat assembly process.
[0030] Preferably, the first inner ring 2 and the second inner ring 3 have the same length.
[0031] Preferably, the thickness is 7.9 mm and the quenching hardness is 58-64 HRC.
[0032] Preferably, the diameter of the trimming roller neck 1 is ø254.2mm (+0.08, +0.109).
[0033] Preferably, the outer diameter of the first inner ring 2 and the second inner ring 3 is 270 mm.
[0034] After heating the first inner ring 2 to 100-120℃, it is fitted onto the dressing roller neck. Then, the second inner ring is heated to 100-120℃ and fitted onto the dressing roller neck. After assembly, the surfaces of the first inner ring 2 and the second inner ring can be dressed.
[0035] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
[0036] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. An inner ring structure for repairing specific roll necks of rolling mills, applied to rolling mills with damaged roll neck surfaces, characterized in that, The inner ring structure for the specific roll neck repair of the roll includes: The trimmed roll neck is formed by cutting a damaged roll neck. The first inner ring is a tubular component. The outer diameter of the first inner ring is the same as the diameter of the roll neck of the rolling mill. The inner diameter of the first inner ring is interference-fitted with the diameter of the dressing roll neck. The first inner ring is fitted onto the dressing roll neck. The second inner ring is a tubular component. The outer diameter of the second inner ring is the same as the diameter of the roll neck. The inner diameter of the second inner ring is interference-fitted with the diameter of the dressing roll neck. The sum of the lengths of the first inner ring and the second inner ring is the same as the length of the roll neck. The second inner ring is fitted onto the dressing roll neck.
2. The inner ring structure for repairing specific roll necks according to claim 1, characterized in that, The first inner ring and the second inner ring are fitted onto the trimming roller neck using a thermal assembly process.
3. The inner ring structure for repairing specific roll necks according to claim 2, characterized in that, The first inner ring and the second inner ring have the same length.
4. The inner ring structure for repairing specific roll necks according to claim 3, characterized in that, The thickness is 7.9 mm, and the quenching hardness is 58-64 HRC.
5. The inner ring structure for repairing specific roll necks according to claim 4, characterized in that, The diameter of the trimming roller neck is ø254.2mm (+0.08, +0.109).
6. The inner ring structure for repairing specific roll necks according to claim 5, characterized in that, The outer diameter of the first inner ring and the second inner ring is 270 mm.