Novel withdrawal and straightening machine roller remanufacturing process method
By using thermal spray welding + high-speed laser cladding technology to prepare a high-hard wear-resistant layer on the surface of the pull-up roller, the problem of difficulty in repairing the existing pull-up roller after wear is solved, and efficient remanufacturing and long-life use of the roller are achieved.
Patent Information
- Application Number
- CN202411886071.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-04-11
AI Technical Summary
The existing puller rollers are difficult to repair after wear, resulting in direct scrapping, resulting in waste and increased production costs.
The high-hard wear-resistant layer is prepared on the surface of the pulling machine roller by thermal spray welding + high-speed laser cladding technology to extend the service life of the roller.
Through thermal spray welding and high-speed laser cladding technology, the wear resistance of the puller roller is significantly improved, the service life is extended by at least ten times, and the maintenance cost is reduced.
Smart Images
Figure CN119800268A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of roller remanufacturing, and specifically relates to a process method for remanufacturing a straightening machine roller by utilizing thermal spray welding + high-speed laser cladding technology. Background Art
[0002] During the cold rolling process, the steel plate may have various shape defects, such as wavy shape, edge bending, etc. The tension straightener straightens the steel plate through the combined action of stretching and bending to improve its straightness and material properties.
[0003] The working principle of the tension leveler is to use two sets of bending rollers and one set of straightening rollers to make the steel plate undergo severe bending under the action of strip tension, resulting in elastic-plastic extension deformation. This deformation helps to eliminate the three-dimensional shape defects of the steel plate. Subsequently, the straightening roller will further adjust the residual curvature of the steel plate to achieve a more ideal straightness.
[0004] The rollers of the tension and leveling machine usually use high-strength alloy tool steel, such as 25CrMo4, 35CrMo, 42CrMo, Cr5, Cr8, etc., to ensure sufficient wear resistance and mechanical properties. The hardness of the wear-resistant layer can reach HRC50-60 to cope with high-wear working conditions.
[0005] The roller surface will wear due to long-term contact with the metal sheet, especially under high speed or high load conditions. Wear will cause the roller surface to be rough, affecting the straightening effect. The material on the roller surface may peel off due to fatigue, especially in areas where there are defects or inclusions on the roller surface. Long-term heavy loads or heat effects may cause permanent deformation of the roller, affecting the straightening accuracy. In short, the tension straightener roller will be damaged in various ways during long-term use.
[0006] After the surface of the straightening machine roller is worn, it can only be used by grinding. After the wear-resistant layer is consumed, the straightening machine roller is scrapped. The existing straightening machine roller is made of high-carbon high-alloy steel, has a tempered martensite structure, and has a small working roller diameter and a length-to-diameter ratio of more than 30. The use of surfacing welding, thermal spray welding, and conventional laser cladding has problems such as welding cracks and deformation, which are difficult to repair. It is directly scrapped after wear, causing a lot of waste and increasing production costs. Summary of the invention
[0007] In order to overcome the above problems, the present invention provides a new process method for remanufacturing of a straightening machine roller. After the straightening machine roller is worn, a high-hardness wear-resistant layer is prepared on the surface by thermal spray welding + high-speed laser cladding technology to meet the repeated use of the straightening machine roller. The service life is at least ten times that of the original straightening machine roller, which can effectively reduce the maintenance cost of the straightening machine roller.
[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A novel process for remanufacturing a straightening machine roller comprises the following steps: Step S1, select a straightening machine roller with a surface wear of more than 0.3 mm, grind it to a diameter smaller than 0.8 mm of the finished product, wipe it with alcohol to remove oil stains and surface attachments, and make the surface clean; Step S2, selecting alloy powder for thermal spraying, the alloy components including C, Ni, W, B, V, Fe, and mixing them evenly; Step S3, performing thermal spraying on the straightening machine roller processed in step S1 to form an alloy layer on the surface thereof; The straightening machine roller processed in step S4 and step S3 is subjected to high-speed laser cladding, with a laser power of 3500 W and argon protection. The alloy powder fed during laser cladding is spherical titanium carbide particles.
[0009] Step S5, fine grinding the laser clad straightening machine roller to the finished product size to obtain a repaired straightening machine roller.
[0010] A further improvement of the technical solution of the present invention is that the contents of the alloy components in step S2 are as follows: C0.2%, Ni25%, W45%, B15%, V5%, and the balance is Fe.
[0011] The technical solution of the present invention is further improved in that: in the thermal spraying process in step S3, the barrel size is 100 mm, the kerosene flow rate is 20 L / h, the oxygen flow rate is 50000 L / h, and the temperature is 1550°C.
[0012] The further improvement of the technical solution of the present invention is that in step S4, the powder feeding is 0.5 kg / h, the light spot is Φ1 mm, and the line speed is 100 mm / min.
[0013] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is: The present invention provides a novel process method for remanufacturing a straightening machine roller. After the straightening machine roller is worn, a high-hardness wear-resistant layer is prepared on the surface by adopting thermal spray welding + high-speed laser remelting technology to meet the requirements of repeated use of the straightening machine roller. The service life is at least ten times that of the original straightening machine roller, which can effectively reduce the maintenance cost of the straightening machine roller.
[0014] The technology of the present application avoids the stress cracks, deformation and other problems of conventional laser cladding and surfacing. The cladding layer is uniform and has high processing accuracy, with a processing allowance of 0.2mm, which reduces the repair cost and grinding processing cost.
[0015] The thermal spraying material used in this application is a wear-resistant material, which can improve the wear resistance of the surface; then high-speed laser remelting is used to avoid cracks on the one hand, and to increase the bonding strength of the coating and avoid coating peeling on the other hand; spherical titanium carbide particles are added during the high-speed remelting process, and the combined effect of the thermal spraying material further improves the surface wear resistance. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 3 is the metallographic structure diagram of the tension and leveling machine roller after remanufacturing in the embodiment. DETAILED DESCRIPTION
[0017] The present invention is further described in detail below in conjunction with embodiments: The present invention discloses a process method for remanufacturing a straightening machine roller. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to achieve the remanufacturing process.
[0018] When the surface wear of the straightening machine roller of a rolling line exceeds 0.3mm, the straightening machine roller is ground to 0.8mm smaller than the finished product diameter, using thermal spray welding + high-speed laser remelting technology.
[0019] The specific steps include: Step S1, grinding the straightening machine roller with a surface wear of more than 0.3 mm to a diameter smaller than 0.8 mm of the finished product, and wiping with alcohol to remove surface attachments such as oil stains to make the surface clean; Step S2, selecting alloy powder for thermal spraying, the alloy components including C, Ni, W, B, V, and Fe, mixing them evenly, and the content of the alloy components is as follows: C 0.2%, Ni 25%, W 45%, B 15%, V 5%, and the balance is Fe; Step S3, thermal spray welding is performed on the straightening machine roller processed in step S1 to form an alloy layer on its surface; in the thermal spray welding process, the barrel size is 100 mm, the kerosene flow rate is 20 L / h, the oxygen flow rate is 50000 L / h, and the temperature is 1550°C.
[0020] The straightening machine roller processed in step S4 and step S3 is subjected to high-speed laser cladding, with argon protection. The alloy powder fed during laser cladding is spherical titanium carbide particles. The laser power is 3500W, the powder feeding is 0.5kg / h, the spot is Φ1mm, and the line speed is 100mm / min. A 0.5mm thick cladding layer is added (1mm in the diameter direction), and then finely ground to the finished product size. The hardness of the wear-resistant layer is HRC62-66, and the machine is used repeatedly.
[0021] Figure 1This is the metallographic structure diagram of the straightening machine roller after remanufacturing in this embodiment. It can be seen from the figure that the wear-resistant layer contains wear-resistant alloys such as W, B, and V, and the wear resistance is significantly improved; the wear-resistant layer contains a large number of TiC particles, and the wear resistance is further improved. The wear-resistant layer and the wear-resistant particles interact with each other, and the overall wear resistance is improved by more than ten times.
Claims
1. A new process for remanufacturing rollers of a tensioning and leveling machine, characterized in that The following steps are involved: Step S1, select a straightening machine roller with a surface wear of more than 0.3 mm, grind it to a diameter smaller than 0.8 mm of the finished product, wipe it with alcohol to remove oil stains and surface attachments, and make the surface clean; Step S2, selecting alloy powder for thermal spraying, the alloy components including C, Ni, W, B, V, Fe, and mixing them evenly; Step S3, performing thermal spraying on the straightening machine roller processed in step S1 to form an alloy layer on the surface thereof; The straightening machine roller processed in step S4 and step S3 is subjected to high-speed laser cladding, with a laser power of 3500W and argon protection. The alloy powder fed during laser cladding is spherical titanium carbide particles; Step S5, fine grinding the laser clad straightening machine roller to the finished product size to obtain a repaired straightening machine roller.
2. A novel process for remanufacturing a straightening machine roller according to claim 1, characterized in that: The content ratio of the alloy components in step S2 is: C0.2%, Ni25%, W45%, B15%, V5%, and the balance is Fe.
3. The novel process for remanufacturing a straightening machine roller according to claim 1 is characterized in that: In the thermal spraying process in step S3, the barrel size is 100 mm, the kerosene flow rate is 20 L / h, the oxygen flow rate is 50000 L / h, and the temperature is 1550°C.
4. The novel process for remanufacturing a straightening machine roller according to claim 1 is characterized in that: In step S4, the powder feeding rate is 0.5 kg / h, the light spot is Φ1 mm, and the linear speed is 100 mm / min.