Blind hole sleeve structure for repairing roller end of working roller
By designing the blind hole sleeve structure at the working roller end, and using bearing steel material and hot assembly technology, the problem of damage to the working roller end under long-term extrusion is solved, and the roll end is reliable repair and service life are extended, ensuring the stability of the rolling process and the quality of the steel strip.
Patent Information
- Application Number
- CN202421985418.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-08-16
AI Technical Summary
The end of the working roller is damaged under long-term extrusion, resulting in slag and block loss and cannot be continued to be used. The prior art lacks an effective repair structure.
A blind hole sleeve structure for repairing the work roller end is designed, a cylindrical blind hole sleeve made of bearing steel is fixed to the damaged work roller end by thermal assembly, and the top hole is processed at the outer end of the blind hole sleeve to ensure consistent coaxiality, internal and external circular interference fit, and matching baffle and chamfer design to meet long-term extrusion needs.
It effectively extends the service life of the working roller, avoids the impact of the roller end on the surface quality of the steel strip when it is damaged, and ensures the stability and safety of the rolling process.
Smart Images
Figure CN223070139U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a blind hole sleeve structure for repairing the end of a working roll, belonging to the technical field of repairing the end of a working roll or a roll of the same type. Background Technique
[0002] The working roll is the main working component of the rolling mill for rolling steel strips. During the actual production process, while the roll surface bears huge rolling forces, the end of the roll is squeezed against the thrust bearing to control the transverse force generated on the working roll due to the lateral movement of the intermediate roll (as Figure 1 shown). The long-term extrusion causes damage to the end of the working roll, such as chipping and peeling, making it unusable.
[0003] A roll end repair structure that can withstand extrusion and be effective in the long term is the key to extending the life cycle of the working roll. There is an urgent need for a roll end repair structure. Content of the Utility Model
[0004] In order to overcome the above deficiencies, the utility model provides a blind hole sleeve structure for repairing the end of a working roll, which can effectively repair the end of the working roll, withstand long-term extrusion, and effectively extend the life cycle of the working roll.
[0005] The technical solution adopted by the utility model is:
[0006] A blind hole sleeve structure for repairing the end of a working roll is provided with a blind hole sleeve at the end of the working roll. Its structure is cylindrical and is fixed to the end of the working roll after being damaged and turned by hot assembly. A center hole for a center point is machined at the outer end of the blind hole sleeve, and the center line of this center hole for a center point is consistent with the axes of the outer circle and the inner circle of the blind hole sleeve.
[0007] The blind hole sleeve is made of bearing steel.
[0008] The stepped fine shaft end of the working roll end and the inner circle of the blind hole sleeve are in interference fit.
[0009] When the diameter of the working roll is 200 mm, the supporting blind hole sleeve structure for repairing the end of the working roll is as follows: the outer diameter of the cylinder of the blind hole sleeve is 130 mm, the inner diameter is 90 mm, the thickness is 20 mm, and the length of the cylinder is 75 mm. The thickness of the baffle is 20 mm, the small hole diameter of the center hole for a center point is 10 mm, the large hole diameter is 26 mm, and the central angle corresponding to the large hole is 60°. A 5.0×45° chamfer is provided at the contact between the blind hole sleeve and the working roll end.
[0010] The beneficial effects brought by the blind hole sleeve structure for repairing the end of the working roll provided by the utility model are:
[0011] (1) It is used for repairing the end of the roll and can safely, reliably, and effectively solve the problem that the long-term extrusion causes damage to the end of the working roll, such as chipping and peeling, making it unusable during use;
[0012] (2) It is applicable to the repair of the roller ends of work rolls or the same type of rolling rolls, with strong universality and practicability.
[0013] The following further describes the present utility model in conjunction with the accompanying drawings and embodiments. Description of the Drawings
[0014] Figure 1 It is a diagram of the extrusion of the roller end of the work roll and the thrust bearing in the prior art;
[0015] Figure 2 It is a schematic diagram of the blind hole sleeve structure of the present utility model;
[0016] Figure 3 It is a diagram of the use state of the present utility model.
[0017] In the figure: 1 is the upper work roll, 2 is the lower work roll, 3 is the first thrust bearing, 4 is the second thrust bearing, 5 is the chamfer, 6 is the blind hole sleeve, 7 is the outer circle, 8 is the inner circle, 9 is the baffle, 10 is the center hole, 11 is the work roll; A is the interference fit. Specific Embodiments Embodiment
[0018] As Figure 2 and 3 shown, a blind hole sleeve structure for repairing the roller end of a work roll is provided with a blind hole sleeve 6 at the roller end of the work roll. Its overall structure is cylindrical, and a baffle 9 is provided at the outer end; the blind hole sleeve is fixed at the roller end of the work roll 11 after being damaged and turned by hot assembly. A center hole 10 is machined in the center of the baffle of the blind hole sleeve, and the center line of the center hole is consistent with the axes of the outer circle 7 and the inner circle 8 of the blind hole sleeve.
[0019] The blind hole sleeve 6 is made of bearing steel.
[0020] The stepped thin shaft end at the roller end of the work roll 11 and the inner circle 8 of the blind hole sleeve are in hot assembly and interference fit.
[0021] Taking the work roll with a diameter of 200 mm as an example, the outer diameter of the cylinder of the blind hole sleeve is 130 mm, the inner diameter is 90 mm, the thickness is 20 mm, and the length of the cylinder is 75 mm. The thickness of the baffle is 20 mm, the small hole diameter of the center hole is 10 mm, the large hole diameter is 26 mm, and the central angle corresponding to the large hole is 60°. A 5.0×45° chamfer 5 is provided at the contact between the blind hole sleeve and the roller end of the work roll. As Figure 2 shown.
[0022] This blind hole sleeve structure includes the following designs:
[0023] (1) Blind hole sleeve structure design:
[0024] When manufacturing the blind hole sleeve structure, the coaxiality of the outer circle, inner circle, and center hole must be ensured to be consistent. The material is selected as bearing steel. After multiple rolling and extrusion tests under different quenching hardness conditions, it is determined that the matching effect is the best when the hardness is 60-62HRC. This hardness can not only meet the requirements of rolling and extrusion but also prevent the steel strip surface from being damaged due to the excessive hardness of the steel when it is damaged.
[0025] For the selection of roll end repair, it is necessary to ensure normal and good operation, and also ensure that the damage mode has the least damage to the steel strip when it is damaged. The blind hole sleeve structure design has an overall strength, and the best match of material and hardness, which can meet the requirement that the slag and the body are always adhered together when damaged, and will not cause quality problems to the steel strip due to steel breakage.
[0026] (2)Assembly process guarantee for the blind hole sleeve and the roll end of the working roll:
[0027] When the blind hole sleeve is installed at the roll end, the stepped shaft end processed at the roll end and the inner circle of the blind hole sleeve are in interference fit and are assembled by heating, but the heating temperature does not exceed 120°C.
[0028] After assembly, ensure that the coaxiality of the blind hole sleeve at the roll end, the center hole, and the roll surface of the working roll is consistent: during subsequent grinding, it is clamped and fixed by the center holes at both ends. Poor assembly accuracy will result in grinding problems such as non-round grinding of the roll surface.
[0029] This structure is made of bearing steel; the actual working conditions such as grinding and rolling of the working roll should be fully considered, including the following points:
[0030] 1. The first point: After the roll end is repaired, ensure that the mechanical properties such as strength and hardness are not inferior to the original roll end, and meet the long-term extrusion force during the rolling process;
[0031] 2. The second point: Facilitate the control of machining accuracy. After the roll end is repaired, it is necessary to ensure good coaxiality of the roll end sleeve, the center hole, and the roll surface of the working roll, which is convenient for subsequent grinding.
[0032] This utility model excludes the through-hole sleeve which is simple to process and has good accuracy guarantee, and selects the structure design of the blind hole sleeve. It can not only ensure normal and good operation but also ensure that the damage mode has the least damage to the steel strip when it is damaged. The blind hole sleeve structure design has an overall strength, and the best match of material and hardness, which can meet the requirement that the slag and the body are always adhered together when damaged, and will not cause quality problems to the steel strip due to steel breakage.
[0033] Although this technical solution has been disclosed as above with embodiments, it is not intended to limit the protection scope of this utility model. Any other modifications or equivalent replacements made by those familiar with this technology without departing from the concept and scope of this utility model shall fall within the protection scope of this utility model.
Claims
1. A blind hole sleeve structure for repairing the end of a work roll, characterized in that: The blind hole sleeve is arranged at the end of the work roll. Its overall structure is cylindrical, and a baffle is provided at the outer end. A center hole for a center point is provided at the center of the baffle of the blind hole sleeve, and the center line of this center hole for a center point is aligned with the axes of the outer circle and the inner circle of the blind hole sleeve.
2. The blind hole sleeve structure for repairing the working roll end according to claim 1, wherein: The blind hole sleeve is made of bearing steel.
3. The blind hole sleeve structure for repairing the working roll end according to claim 1, characterized in that: An interference fit is provided between the stepped thin shaft end at the end of the work roll and the inner circle of the blind hole sleeve.
4. The blind hole sleeve structure for repairing the working roll end according to claim 1, characterized in that: When the diameter of the work roll is 200 mm, the structure of the blind hole sleeve for repairing the end of the work roll is as follows: the outer diameter of the cylinder of the blind hole sleeve is 130 mm, the inner diameter is 90 mm, the thickness is 20 mm, and the length of the cylinder is 75 mm.
5. The blind hole sleeve structure for repairing the end of a work roll according to claim 1, characterized in that: The thickness of the baffle is 20 mm, the diameter of the small hole of the center hole for a center point is 10 mm, the diameter of the large hole is 26 mm, and the central angle corresponding to the large hole is 60°; a 5.0×45° chamfer is provided at the contact between the blind hole sleeve and the end of the work roll.