CN101225463B - Method for restoring and improving service life of hot roller and cold rolling subsidiary roller - Google Patents
Method for restoring and improving service life of hot roller and cold rolling subsidiary roller Download PDFInfo
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- CN101225463B CN101225463B CN2008100522129A CN200810052212A CN101225463B CN 101225463 B CN101225463 B CN 101225463B CN 2008100522129 A CN2008100522129 A CN 2008100522129A CN 200810052212 A CN200810052212 A CN 200810052212A CN 101225463 B CN101225463 B CN 101225463B
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Abstract
The present invention relates to a method to resume and improve the service life of hot rollers and cold auxiliary rollers, which comprises the following steps: (1) test the stress of working roller body of invalid or scrapped rollers, and then test the damage degree of cracks and peeling layers on stress concentration parts; evaluate the residue life and analyze the strength based on the tested damage degree; evaluate remanufacturing craftwork and economical efficiency, forecast the service life and design the service life period on the basis; (2) use laser quick shape deposition manufacture to quickly form the original shape of the roller with designed service life; (3) after the roller is quickly formed through laser quick shape deposition manufacture, conduct the process treating of strengthening and toughening for the material of the deposition layer. The method to resume and improve the service life of hot rollers and cold auxiliary rollers has the advantages that: the steel rolling throughput during the rolling process can be improved by 30% to 50%; the service cycle can be prolonged; and the service life of the backup roller can be improved by more than 30%.
Description
Technical field
The present invention relates to iron and steel metallurgical industry, particularly relate to a kind of method of recovering to improve hot roll and cold rolling help roll work-ing life.
Background technology
In the iron and steel enterprise, hot roll that uses on the cold and hot continuous rolling production line and cold rolling help roll are important, and the parts of consumption in enormous quantities are arranged.For example, support roll is the help roll in the roll, and support roll adopts high carbon containing and high quality steel casting or forging molding.On rolling line, support roll belongs to driven roll.When operation its place ahead squeezed, under pressurized, the rear tension, deep layer is subjected to shear stress.Therefore support roll bears repeated load effects such as extruding draw cut near the point of contact when operation.Because body of roll materials used is forging and residual inclusion during casting defectives such as hole, fine crack.Factor the such as perhaps hardness of material is low has reduced fatigue strength.In the mechanism repeatedly of repeated load, the defective in the material is the source that produces fatigue cracking, causes that support roll peels off damage, lost efficacy or scraps because of deep layer takes place fatigue.
Support roll is a very important help roll on the rolling line.Reach when scrapping the limit when support roll uses, general small-sized support roll is both at home and abroad more adopts conventional overlaying method reparations.Support roll after the process built-up welding reparation has with low cost, the technology characteristic of simple.But work-ing life and result of use are difficult to return to the level of the new roller of former manufacturing.And surpass 30 tons, even reach more than 120 tons in, the support roll of large-scale inefficacy, all not better effective technological method reparations of raising its work-ing life, performance both at home and abroad at present.In using in the domestic iron and steel enterprises, large-scale support roll, from external import, cost an arm and a leg more than 60 percent, be the big consuming cost of one in the steel industry, also be a hard nut to crack.
Summary of the invention
The present invention for solve the technical problem that exists in the known technology provide a kind of can make lost efficacy or scrap in, large-scale support roll recovers functions of use, and the recovery that improves its cycle in work-ing life improves the method in hot roll and cold rolling help roll work-ing life.
The present invention for the technical scheme that solves the technical problem that exists in the known technology and take is: a kind of method of recovering to improve hot roll and cold rolling help roll work-ing life, may further comprise the steps: (1) is carried out stress to the work body of roll of the described roll that lost efficacy or scrapped and is detected, then to showing that crackle is carried out at the stress concentration position and the exfoliation layer degree of injury detects; Carry out strength analysis and residual life evaluation again according to detecting degree of injury; On this basis described roll is carried out anufacturability, economy evaluation again, carry out life-cycle prediction and the design of cycle life-cycle; (2) to finishing the described roll of life-cycle design, application laser entity free forming technology is carried out original shape and is shaped fast; Concrete processing method is: a, employing machining process are cleared up described roll fatigue damage position, remove exfoliation layer and crackle, reach zero defect metal cleaning surface, carry out ultrasonic wave and surface colour nondestructive flaw detection examination, described roll is answered flawless, harmful being mingled with and defective such as hole; B, carry out the quick shape of described rolling face laser deposition and make, the laser fast forming alloy material is on described roll starting material basis, increase the alloying element of anti-combined stress fatigue, simultaneously, in the settled layer alloy, increase nanocomposite ceramic materials such as WC, SIC, CrC; (3) described roll carries out the material reinforcement toughening process of settled layer immediately and handles after the laser fast deposition is shaped.
The present invention can also adopt following technical measures:
Described recovery improves the method in hot roll and cold rolling help roll work-ing life, it is characterized in that: the material reinforcement toughening process of the settled layer of described step (3) is handled and is comprised application flexibility heating unit and temperature program(me) Controlling System, keeps 12 hours in 560～600 ℃ of temperature.
Described recovery improves the method in hot roll and cold rolling help roll work-ing life, it is characterized in that: described step (1) is used the TSC-1M-4 magnetic memory detector to the described roll that lost efficacy or scrap the described roll work body of roll is carried out the stress detection, then to showing that the stress concentration position adopts the PXUT-TX-2008 supersonic reflectoscope to carry out crackle and the exfoliation layer degree of injury detects.
Described recovery improves the method in hot roll and cold rolling help roll work-ing life, and it is characterized in that: described step (2) is used the high-power CO of 6KW
2Laser apparatus carries out the quick shape deposition of described roller body working face laser and makes on five four-linkage numerical control machining tools, laser power 6KW, and scanning speed 360mm/ branch adopts 2 * 20mm rectangle focused light, the once thick 6mm of fast deposition layer.
Advantage and positively effect that the present invention has are: adopt hot roll and cold rolling help roll after the present invention handles, put on the iron and steel rolling line and use, can improve operation of rolling steel amount 30～50%, prolong life cycle, hot roll and cold rolling help roll improve more than 30% work-ing life.The present invention has material-saving, energy-conservation, the advantage that increases rolling stock output.If the steel industry large-scale promotion application will produce sizable economic benefit and remarkable social benefit.
Embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, be described in detail as follows:
Be example with the support roll that uses on the cold rolled sheet material production line, this support roll is a composite roll, the monolateral thickness 275mm of work body of roll working lining roller shell, and roller case material 9Cr2Mo forging is made, hardness HRC45～48.56 tons of support roll substances, total length 5600mm, body of roll Φ 1570mm, the long 2300mm of the body of roll.Find that through life-time service two flake-off pieces, wherein about a 300 * 400mm appear in about 200mm place apart from the edge in the body of roll one side; About 170 * the 230mm of another piece, in the about 10～90mm scope of exfoliation layer thickness, the exfoliation layer periphery has many dark about 10mm left and right sides crackles, and support roll lost efficacy and can not continue to use.
The method that adopts the present invention to recover to improve hot roll and cold rolling help roll work-ing life is carried out laser fast forming and is made reparation again it:
1, at first it is used the TSC-1M-4 magnetic memory detector support roll work body of roll is carried out the stress detection, then to showing that the stress concentration position adopts the PXUT-TX-2008 supersonic reflectoscope to carry out crackle and the exfoliation layer degree of injury detects.Carry out strength analysis and residual life evaluation again according to detecting degree of injury.On this basis support roll is carried out anufacturability, economy evaluation again, life-cycle prediction and the design of cycle life-cycle.
2, the support roll of finishing through the life-cycle design, application laser entity free forming technology is carried out original shape and is shaped fast.Concrete processing method is: at first adopt machining process cleaning support roll fatigue damage position, remove exfoliation layer and crackle, reach zero defect metal cleaning surface, carry out ultrasonic wave and surface colour nondestructive flaw detection examination again, answer flawless, harmful being mingled with and defective such as hole.
Use the high-power CO of 6KW
2Laser apparatus carries out the quick shape deposition of support roll body of roll working face laser and makes on five four-linkage numerical control machining tools.Laser power 6KW, scanning speed 360mm/ branch adopts 2 * 20mm rectangle focused light, the once thick 6mm of fast deposition layer.Laser fast forming on support roll starting material basis, increases the alloying element of anti-combined stress fatigue with alloy material, improves the fatigue of materials pi of strength of settled layer, and settled layer and base material are realized the metallurgical binding of microscopic metal structural state fully.Simultaneously, in the settled layer alloy, increase nanocomposite ceramic materials such as WC, SIC, CrC,, strengthened toughness of material and wear resistance index improving on the support roll operational layer material antifatigue damage strength basis.
3, after support roll laser fast deposition is shaped, carries out the material reinforcement toughening process of settled layer immediately and handle, application flexibility heating unit and 7C5 type intelligent temperature sequence control system kept 12 hours in 560～600 ℃ of temperature.The result has eliminated the material internal stress of support roll integral body accumulation in the long period circulation is on active service on the one hand, recovers the mechanical property of metal structure.Also refinement and the laminated gold copper-base alloy metallographic structure of stably depositing simultaneously improves its intensity index; Make nano ceramics matrix material disperse ground again, dissolve in equably in the support roll laser deposition working lining metal structure, reach the effect of obdurability.
Through the laser fast forming combination technique and again the manufacturing engineering technology its fatigue flake damage field is carried out life-cycle design and the quick shape deposition of laser is repaired manufacturing again, recovered former supporting body of roll size and use properties claimed range.Recycle through production cycle, find to repair and make position generation fatigue flake and crackle again.Through the applying unit record case, reach original design use properties and cycle military service technical requirements, it is nearly 70% to prolong this support roll time in work-ing life, has saved nearly more than the 300 ten thousand yuan of funds that more renew roller, increase and produce nearly 300,000 tons of steel plate, for enterprise brings remarkable economic efficiency.
Claims (3)
1. method of recovering to improve hot roll and cold rolling help roll work-ing life is characterized in that: may further comprise the steps:
(1) the work body of roll of the described roll that lost efficacy or scrapped is carried out stress and detect, then to showing that crackle is carried out at the stress concentration position and the exfoliation layer degree of injury detects; Carry out strength analysis and residual life evaluation again according to detecting degree of injury; On this basis described roll is carried out anufacturability, economy evaluation again, carry out life-cycle prediction and the design of cycle life-cycle;
(2) to finishing the described roll of life-cycle design, the quick shape deposition of application laser manufacturing technology is carried out original shape and is shaped fast; Concrete processing method is:
A, employing machining process are cleared up described roll fatigue damage position, remove exfoliation layer and crackle, reach zero defect metal cleaning surface, carry out ultrasonic wave and surface colour nondestructive flaw detection examination, and described roll is answered flawless, harmful being mingled with and hole defect;
B, carry out the quick shape of described rolling face laser deposition and make, it is on described roll starting material basis that the quick shape deposition of laser is made with alloy material, increase the alloying element of anti-combined stress fatigue, simultaneously, in the settled layer alloy, increase WC, SiC, CrC nanocomposite ceramic material;
(3) described roll is after the quick shape deposition of laser is made, carrying out the material reinforcement toughening process of settled layer immediately handles, the material reinforcement toughening process of described settled layer is handled and is comprised application flexibility heating unit and temperature program(me) Controlling System, keeps 12 hours in 560～600 ℃ of temperature.
2. recovery according to claim 1 improves the method in hot roll and cold rolling help roll work-ing life, it is characterized in that: described step (1) is used the TSC-1M-4 magnetic memory detector to the described roll that lost efficacy or scrap the described roll work body of roll is carried out the stress detection, then to showing that the stress concentration position adopts the PXUT-TX-2008 supersonic reflectoscope to carry out crackle and the exfoliation layer degree of injury detects.
3. recovery according to claim 1 improves the method in hot roll and cold rolling help roll work-ing life, and it is characterized in that: described step (2) is used the high-power CO of 6KW
2Laser apparatus carries out the quick shape deposition of described roller body working face laser and makes on five four-linkage numerical control machining tools, laser power 6KW, and scanning speed 360mm/ branch adopts 2 * 20mm rectangle focused light, the once thick 6mm of fast deposition layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100522129A CN101225463B (en) | 2008-01-30 | 2008-01-30 | Method for restoring and improving service life of hot roller and cold rolling subsidiary roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100522129A CN101225463B (en) | 2008-01-30 | 2008-01-30 | Method for restoring and improving service life of hot roller and cold rolling subsidiary roller |
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| Publication Number | Publication Date |
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| CN101225463A CN101225463A (en) | 2008-07-23 |
| CN101225463B true CN101225463B (en) | 2011-07-20 |
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| CN2008100522129A Expired - Fee Related CN101225463B (en) | 2008-01-30 | 2008-01-30 | Method for restoring and improving service life of hot roller and cold rolling subsidiary roller |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818342B (en) * | 2009-12-15 | 2011-12-21 | 江苏大学 | Method and device for preparing working layer of metallurgical hot roll by laser direct deposition |
| CN102154643B (en) * | 2011-05-17 | 2014-06-04 | 江苏共昌轧辊股份有限公司 | Method for repairing composite roller by laser rapid forming |
| CN102424255A (en) * | 2011-08-12 | 2012-04-25 | 天津理工大学 | Remanufacture technology for waste support roller of belt conveyor |
| CN102744259A (en) * | 2012-06-15 | 2012-10-24 | 鞍钢股份有限公司 | Groove modifying method for reducing roller consumption |
| CN103710496B (en) * | 2014-01-13 | 2016-04-20 | 攀枝花钢城集团有限公司 | Section roll restorative procedure |
| CN106868499B (en) * | 2017-01-18 | 2019-06-07 | 唐山市丰南区天泽科技有限公司 | A kind of reproducing method of pass hot roll |
| CN109541166A (en) * | 2018-11-30 | 2019-03-29 | 蓬莱市超硬复合材料有限公司 | A kind of method of quality control of hard alloy roll checking process |
| CN109557181A (en) * | 2018-12-03 | 2019-04-02 | 四川科特检测技术有限公司 | A kind of wellhead assembly on-line checking technique |
| CN113553738B (en) * | 2021-07-01 | 2022-11-15 | 邯郸钢铁集团有限责任公司 | Fatigue life prediction method for hot-rolled plate strip rolling mill |
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