CN104439881A - Laser cladding and on-line machining repair method for roughing mill housing roller positioning groove - Google Patents
Laser cladding and on-line machining repair method for roughing mill housing roller positioning groove Download PDFInfo
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- CN104439881A CN104439881A CN201410664713.8A CN201410664713A CN104439881A CN 104439881 A CN104439881 A CN 104439881A CN 201410664713 A CN201410664713 A CN 201410664713A CN 104439881 A CN104439881 A CN 104439881A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks
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Abstract
The invention relates to a laser cladding and on-line machining repair method for a roughing mill housing roller positioning groove, and belongs to the technical field of surface modification and equipment repair. Machining equipment comprises a 2500 movable boring and milling machine, an all-solid-state laser device, a mechanical hand, a manipulator, a pneumatic powder feeder, a self-made construction platform and the like. The technological process includes the steps of building the platform, leading in the equipment, adjusting, centering and fixing the equipment, performing rough machining, performing precision measurement for flaw detection, performing laser cladding, performing precision measurement for flaw detection, fine machining, performing precision measurement for flaw detection and tracking to verify the effect. The laser cladding and on-line machining repair method has the advantages that the equipment strength is not affected, hot stress influence during repair welding is avoided, while equipment accuracy is recovered, the outage time can be shortened, and the repair cost can be reduced; a metal base material can be effectively protected from abrasion or corrosion by selecting a repair material, the problem is prevented from occurring again, and the service life of the equipment is greatly prolonged; as only the surface of the base material is melt in a micro mode in the laser machining process, the area of a laser cladding heat affected zone is one tenth that of a heat affected zone of argon arc welding.
Description
Technical field
The invention belongs to process for modifying surface and equipment repair technical field, in particular, provide a kind of laser melting coating+online machined restorative procedure of roughing mill breast roll locating slot; Repair online and surface peening for mill housing, not only can recover the dimensional accuracy of locating slot but also significantly improve case hardness, improve wear-resistant, corrosion-resistant, impact-resistant characteristic.
Background technology
Along with the continuous upgrading of Shoudu Iron and Steel Co product quality and description (intensity and precision), improving constantly of output, more and more harsher to the requirement of equipment.The first Qin 4300 rolls under mill housing is operated in high temperature, high humidity environment throughout the year, subject huge impulsive force, and memorial archway material is that (according to design drawing, the material of memorial archway is GS20Mn5 to cast steel, close with domestic ZG20SiMn, belong to low-alloy cast steel, its case hardness is lower, and hardness is not more than HB200), under high temperature, high humidity environment, easy generation distortion and corrosion, cause functions of the equipments precision constantly to decline and decline.
Due to 4300 roughing mills be on active service for many years, the reason such as working condition is harsh, framework memorial archway upper spider roller is caused to locate groove width 350 (+0.100) two sides (the i.e. outlet side of transmission side, fore side and entrance side, face, 8, totally 4 place) wearing and tearing, seriously corroded (estimating at 3 ~ 8mm), cause breast roll bearing install positioning precision lost efficacy.Therefore, affect larger service life on steel plate rolling precision and breast roll.
Summary of the invention
The object of the present invention is to provide a kind of laser melting coating of roughing mill breast roll locating slot+online machined restorative procedure, recover the original drawing dimension precision requirement of locating slot, significantly improve wear-resisting, corrosion resistance and the service life of equipment of repair surface.
Main process apparatus of the present invention comprises: 2500 moving machine boring and milling machines, all solid state laser, manipulator and operator, pneumatic powder feeder and homemade operation platform etc.
Technical process of the present invention is: platform building, and------equipment adjustment centering fixes---roughing---Precision measurement flaw detection---laser melting coating---Precision measurement flaw detection---fine finishining---Precision measurement flaw detection---tracking verification effect etc. in equipment importing.
Main technological steps and the technical parameter of online reparation of the present invention and surface reinforcing method are as follows:
1, operation platform is built
Along rolling direction at frame medial surface by direct for construction basic platform handling on work roll changing track, operation platform is positioned at rolling center, firm for guaranteeing construction basic platform, need support with box-girder box beam Welding under milling train lower track, gap channel-section steel and diamond plate are laid.(emphasis: do not allow to carry out fire operation on framework memorial archway! )
2, equipment is in place, equipment is installed, adjustment
The selection that memorial archway carries out repairing machining equipment online is also one of main difficult point, must take into full account the key points such as site space permission, requirement on machining accuracy, on-the-spot centering mode.2500 moving machine boring and milling machines have bearing capacity high, operate steadily, coefficient of friction is little, running precision is high, absorbing performance is good and guide rail without advantages such as wearing and tearing, meet instructions for use completely.Enter rolling-mill housing platform by rolling direction from entrance side, place by frame medial surface partial center 400, adjustment machine tool levelness take into account machine tool guideway X to framework window medial surface linearity < 0.10mm.
3, roughing before locating slot laser melting coating
Roughing is removed locating slot side fatigue layer and is seen iron true qualities, before roughing, benchmark (shown in accompanying drawing 2) is adjusted in boring and milling equipment school, with compensating cylinder window 2540 (+0.200) installed surface, centering linearity, ensure locating slot processing trailing flank and window side depth of parallelism < 0.05, separate with window center line, measure and determine the concrete laser melting coating thickness in each side of locating slot.Because limiting by frame real space condition, repairing can only selection of small with mobile boring and milling equipment, therefore locating slot roughing everywhere need divide four machining operation after four movements, centering equipment.And machine adds back root part and remains circular arc and do back chipping process bottom locating slot.
4, the measuring and calculating of laser melting coating thickness
The thickness measure of locating slot two sides, location laser cladding layer and calculating, mainly determining according to surveying size after roughing, first carrying out nondestructive inspection detection to repair surface after roughing, then quantitatively determines to repair size (see accompanying drawing 1).δ, δ 0: be wear-thickness; δ 1, δ 2: for removing fatigue layer thickness; 1mm: be allowance.The cladding thickness being calculated each locating slot both sides by measurement data is respectively respectively: δ+δ 1+1mm and δ 2+ δ 0+1mm.
5, laser melting coating
End face dye penetrant inspection before laser melting coating, after testing result needs both sides jointly to confirm, can carry out next procedure operation.Find the defects such as crackle as end face, processing scheme is determined at scene by both party, adopts laser melting coating to process Crack Repairing by Party B.
Under laser beam effect, nickel base self-fluxing alloy powder and matrix surface heat (all solid state laser parameter designing is as follows: spot diameter 2mm, Overlapping Parameters 0.5mm, speed 240mm/min, power 2000w and at every turn moltenly cover thickness 0.3 ~ 0.42mm), and melt light beam remove rear self-excitation cooling formed dilution rate extremely low, be the face coat of metallurgical binding with matrix material.The on-the-spot all solid state laser that adopts carries out laser melting coating to damage surface online, ensures operation in 24 hours during construction, under the condition ensureing repair quality and maintenance duration, drop into 3 all solid state lasers, realizes 2 and opens 1 and run for continuous operation mode.
6, locating slot fine finishining
Moving boring and milling equipment school during fine finishining adjusts benchmark identical with roughing operation, and after processing, locating slot size, locating slot side and the positioned opposite groove symmetry of framework window linearity and two sides meet drawing requirement; During same fine finishining, locating slot need divide four machining operation after four movements, centering equipment everywhere.
7, each procedure all carries out the reinspection of precision size, hardness determination and nondestructive inspection after completing after repairing, and ensures repairing effect and quality.Run more than 1 year, arrange to carry out repetition measurement, tracking verification practical effect to each portion size and repair surface hardness after reparation.
The invention has the advantages that: traditional repair method thoroughly can not solve site problems, more serious injury may be caused to equipment in addition, and equipment scrapping change, not only costly and also the cycle long, may realize hardly.Laser melting coating+online machined restorative procedure both need not remove memorial archway, also do not affect equipment intensity, thermal stress impact when also not producing repair welding, and while restorer precision, can also shorten downtime, reduce rehabilitation expense.By selecting repair materials can the not frayed and corrosion of available protecting metal base, avoid the appearance again of this problem, greatly extension device service life.Matrix material is only surperficial micro-molten in laser processing procedure, and laser melting coating heat affected area is 1/10th of argon arc welding.
(1) the method can utilize the small and exquisite flexible feature of solid state laser, is applicable to online reparation.Compared with manual electric arc pile up welding, laser optical head adopts numerically controlled machine hand as processing structure, can realize Automated condtrol, significantly reduce labour intensity.
(2) during laser melting coating, matrix material in laser processing procedure only surperficial micro-molten thickness be 0.05 ~ 0.1mm.Matrix heat affected area is minimum, is generally 0.1 ~ 0.2mm, and the temperature rise of frame matrix is no more than 80 DEG C, substantially without thermal deformation after Laser Processing, very little on the integrally-built impact of rolling-mill housing, can not bring the danger of stand stretch.
(3) according to device requirement, the selection hardness number of laser cladding of material is in HRC27 ~ 30, and there is wear-resistant and corrosion resistant metal material, the combination property of the locating slot after reparation is improved largely compared with former base material, increase the service life, revolutionize the characteristic of detent groove surface, avoid the detent groove surface harm that brings of machined reparation frequently.
(4) for ensureing that the form and position tolerance of repairing rear locating slot meets the requirements, the original function precision of restorer, breast roll locating slot wear surface, after laser melting coating, adopts mobile boring milling machine to carry out fine finishining to cladding surface, guarantees that locating slot meets drawing precision dimensional requirement.
Accompanying drawing explanation
Fig. 1 is the method determining laser melting coating thickness of the present invention.
Fig. 2 is the determination of processing datum.
Fig. 3 is laser melting coating heat affected area schematic diagram.
Fig. 4 is argon arc welding heat affected area schematic diagram.
Detailed description of the invention
Specific implementation process of the present invention:
Step 1, operation platform are built and equipment imports
Carry out safety verification before construction, handle construction formality and welding and cutting permit.Operation platform specification δ 80 × 1800 × 6000-2 part is built in rolling center, and supports with box-girder box beam Welding under milling train lower track.For anti-workmen falls, gap 20# channel-section steel and diamond plate are laid, and surrounding 50# angle steel and φ 16 ~ 20 round steel welding guard rail, build away ladder if desired.From entrance side, 2500 moving machine boring and milling machines are imported the enterprising Row sum-equal matrix of framework platform.
Step 2, roughing remove locating slot medial surface each fatigue layer
Locating slot side fatigue layer (see iron true qualities) is removed in roughing, before roughing, benchmark (see accompanying drawing 2) is adjusted in boring and milling equipment school, with compensating cylinder window 2540 (+0.200) installed surface centering linearity, ensure locating slot processing trailing flank and window side depth of parallelism < 0.05, separate with window center, measure and determine the concrete laser melting coating thickness in each side of locating slot (see accompanying drawing 1).
Step 3, laser melting coating
After the whole roughing of locating slot everywhere terminates, machining equipment moves a side, simultaneously in place while of 2, laser melting coating manipulator, adjustment, laser melting coating; Locating slot two sides laser melting coating thickness is determined according to surveying size after last process roughing, and laser melting coating adopts functionally gradient material (FGM) to repair damage surface.Hardness after reparation carries out nondestructive inspection detection after HRC27 ~ 30. are repaiied.
Step 4, locating slot fine finishining
During fine finishining, mobile boring and milling equipment school adjusts benchmark identical with roughing operation, locating slot side and framework window linearity < 0.10mm after processing, locating slot size conforms 350 (+0.100), entrance side locating slot side is to window center size 1565 (0-0.20), outlet side locating slot side is to window center size 1585 (0-0.20), entrance side DS side and WS side positioned opposite groove symmetry < 0.20, outlet side transmission side and front side positioned opposite groove symmetry < 0.20; Drawing and instructions for use is all met after guaranteeing fine finishining.
Step 5, according to repairing standard to reparation end face carry out dye penetrant inspection, hardness and repair size check and accept reach instructions for use.End face after reparation meets under normal circumstances, and laser cladding layer does not come off, in 10 years, corrosion-free, the wearing and tearing in the base material position of memorial archway laser melting coating or wear-resisting, the corrosion-resistant index of cladding layer are greater than base material more than 10 times.
The work such as step 6, plant equipment, operation platform etc. are withdrawn, environment cleaning.
Step 7, follow-up inspection actual effect.
Repair operation after 18 months, dismantle two breast rolls and find that sticking up skin, losing flesh or obscission does not appear in cladding layer, and do not find crackle after nondestructive testing is carried out to cladding layer.Carry out repetition measurement to the breast roll location dimensional accuracy of locating slot and form and position tolerance further all not exceed standard, and wear extent is all less than 0.4mm.And repair first 28 months locating slots and add up wear extent and reach 6mm, demonstrate wear-resisting, the anti-corrosion and shock resistance of detent groove surface further and largely improved.
Before and after repairing, data refer to following table:
The contrast of anteroposterior dimension accuracy data repaired by table 1
As can be seen from Table 1, after the locating slot reparation of roughing mill breast roll location, the dimensional accuracy at each position meets drawing and instructions for use.
Table 2 measurement data summary sheet
As can be seen from Table 2, after roughing mill breast roll location locating slot is repaired, the form and position tolerance at each position meets drawing and instructions for use.Laser cladding layer thickness in monolayer is within the scope of 0.3 ~ 0.42mm, and one-sided thickness is maximum to be reached at 8mm, and computing formula is (after roughing size-cladding size+layer thickness)/2, beyond the maximum allowable depth 7mm of laser cladding layer.
Table 3 measurement data summary sheet
As can be seen from Table 3, after roughing mill breast roll locating slot is repaired, laser cladding layer hardness range (HRC), in 26.6 ~ 36.5 scopes, meets Shou Qin company and proposes hardness requirement.
Knotty problem and processing method
(1) adjust cladding powdered ingredients, solve overlarge area reparation
In conjunction with basic material feature, modulation ni-based self-fluxing alloy cladding powder, makes cladding layer possess superior adhesion strength, can be firmly attached to metallic substrate surface, long-term work and can not coming off; And self there is high compression strength, even if up under the roll-force effect of 1900 tons, material also can not damage; There is good shock resistance, the impact of breast roll to locating slot can be absorbed, decrease the degree of wearing and tearing, there is good corrosion resistant, wear-resisting and shock resistance simultaneously.And temperature rise is no more than 80 degree in repair process, without thermal stress deformation, adverse effect is not caused to memorial archway.
(2) argon arc welding and laser melting and coating technique combine, cladding layer thickness exceeds standard control
In the online repair process of laser, after roughing removal locating slot side fatigue layer is shown in iron true qualities, find that direction, entry operation side entrance locating slot end wear is serious, wear extent reaches 8mm.And repair maximum gauge≤7mm in domestic existing laser melting coating reparation case, if exceed the maximum gauge of laser cladding layer permission, will be unfavorable for guaranteeing repairing quality.According to the field condition of first Qin roughing mill breast roll locating slot, adopt argon arc welding mode melting welding about 2mm, reduce laser melting coating thickness, make it to reach optimum Working.Then manual grinding grinds flat, then carries out laser melting coating, to ensure that laser cladding layer quality meets normal instructions for use.
(3) apply laser melting coating+online machining technique, realize large-scale memorial archway and repair online
Adopt laser melting coating+online machining technique to produce line roughing mill breast roll locating slot wear surface to 4300mm to repair, reach laser melting and coating technique to be perfectly combined with online machining technique, and obtain the multifunctionalities such as wear-resisting, anti-corrosion, shock-resistant after repairing.Have both need not remove memorial archway, also not affect equipment intensity, thermal stress impact when also not producing repair welding, and while recovery and lifting means precision, the advantage such as downtime, reduction rehabilitation expense can also be shortened.
(4) polishing, argon arc welding and laser melting coating combine, process overlength crackle
After locating slot roughing, dye penetrant inspection is carried out to four locating slots, eight faces such as entry operation side, entrance transmission side, export operation side, outlet transmission sides, find that there is three faces and there is crackle, respectively at fore side inlet side total length of cracks 100mm, fore side outlet side total length of cracks 50mm, transmission side inlet side total length of cracks 80mm processing method:
1) polish to crack depth 3 ~ 4mm, remove crackle, adopt argon arc welding mode to carry out melting welding, after melting welding, polishing is ground flat, carries out dye penetrant inspection after polishing, ensures that the defects such as flawless can carry out next step laser melting coating;
2) to crack depth more than 3 ~ 4mm, manual grinding is eliminated after crackle, adopts argon arc welding mode to carry out melting welding, closed crack, prevents crackle from continuing expansion and stretches.After melting welding, gentle dye penetrant inspection is ground in polishing, carries out laser melting coating again after ensureing flawless defect.Three place's crackles all eliminate the defects such as crackle after polishing repair welding flaw detection.
(5) take to get out of the way the renovation technique at R angle, obtain good cladding layer
Project draws experience and lessons in the past before repairing, and recognizes that the position at locating slot R angle is special, uses, mostly be region of stress concentration as escape in processing.In repair process, change tradition and repair custom, do not carry out laser melting coating operation at R angle place and avoid local heating.Laser cladding layer is rear naturally excessively to R angle by polishing by hand, and eliminate stress the generation of concentrating and causing crackle, obtains good repair layer, to meet normal instructions for use.
(6) apply local laser restorative procedure, reduce costs the reduction of erection time
1) local laser reparation before roughing
Online rehablitation project, before roughing, adopts precise detection technology to grasp breast roll location locating slot each portion state of wear and cracks.In order to obtain best cost performance, determining to take local laser reparation to 8 locating surfaces of location locating slot after workshop research, reaching wear-resisting, the anti-corrosion and shock resistance of location locating slot entirety and promoting.
2) local laser reparation in roughing process
In roughing process, if locating surface can go out larger area by light, be only concentrated wear serious, have the problem such as crackle or pit, again carry out Precision measurement, the cutting carrying out local spills iron true qualities, adopts the method that local laser is repaired afterwards.
Therefore, before roughing and in process, adopt local laser renovation technique, the cutting output of repair surface can be reduced, the use amount of cladding material powder can be reduced again, reach and find datum level fast, shorten the construction period, make the cladding layer after reparation obtain best cost performance.
Claims (1)
1. the laser melting coating of roughing mill breast roll locating slot adds an online machined restorative procedure, and process equipment comprises: 2500 moving machine boring and milling machines, all solid state laser, manipulator and operator, pneumatic powder feeder and homemade operation platform; It is characterized in that, processing step and technical parameter as follows:
(1) operation platform is built
Along rolling direction at frame medial surface by direct for construction basic platform handling on work roll changing track, operation platform is positioned at rolling center, and support with box-girder box beam Welding under milling train lower track, gap channel-section steel and diamond plate are laid;
(2) equipment is in place, equipment is installed, adjustment
Enter rolling-mill housing platform by rolling direction from entrance side, place by frame medial surface partial center 400, adjustment machine tool levelness take into account machine tool guideway X to framework window medial surface linearity < 0.10mm;
(3) roughing before locating slot laser melting coating
Roughing is removed locating slot side fatigue layer and is seen iron true qualities, before roughing, benchmark is adjusted in boring and milling equipment school, with compensating cylinder window 2540 (+0.200) installed surface, centering linearity, ensure locating slot processing trailing flank and window side depth of parallelism < 0.05, separate with window center line, measure and determine the concrete laser melting coating thickness in each side of locating slot; Locating slot roughing everywhere need divide four machining operation after four movements, centering equipment; And machine adds back root part and remains circular arc and do back chipping process bottom locating slot;
(4) measuring and calculating of laser melting coating thickness
The thickness measure of locating slot two sides, location laser cladding layer and calculating, determining according to surveying size after roughing, first carrying out nondestructive inspection detection to repair surface after roughing, then quantitatively determines to repair size; δ, δ 0: be wear-thickness; δ 1, δ 2: for removing fatigue layer thickness; 1mm: be allowance; The cladding thickness being calculated each locating slot both sides by measurement data is respectively respectively: δ+δ 1+1mm and δ 2+ δ 0+1mm;
(5) laser melting coating
End face dye penetrant inspection before laser melting coating, after testing result needs both sides jointly to confirm, carries out next procedure operation; When end face finds crack defect, laser melting coating is adopted to process Crack Repairing by Party B;
Under laser beam effect, nickel base self-fluxing alloy powder and matrix surface heat, and all solid state laser parameter designing is: spot diameter 2mm, Overlapping Parameters 0.5mm, speed 240mm/min, power 2000w and at every turn moltenly cover thickness 0.3-0.42mm; It is extremely low that fusing light beam removes rear self-excitation cooling formation dilution rate, is the face coat of metallurgical binding with matrix material;
(6) locating slot fine finishining
Moving boring and milling equipment school during fine finishining adjusts benchmark identical with roughing operation, and after processing, locating slot size, locating slot side and the positioned opposite groove symmetry of framework window linearity and two sides meet drawing requirement; During same fine finishining, locating slot need divide four machining operation after four movements, centering equipment everywhere;
(7) each procedure all carries out the reinspection of precision size, hardness determination and nondestructive inspection after completing after repairing.
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| CN106695239A (en) * | 2015-11-18 | 2017-05-24 | 上海宝冶集团有限公司 | Disassembling overhauling method of mandrel of pickling-rolling uncoiling machine |
| CN108118335A (en) * | 2017-12-28 | 2018-06-05 | 沈阳大陆激光技术有限公司 | A kind of laser repair method of high-pressure water descaling collector |
| CN108817840A (en) * | 2018-07-11 | 2018-11-16 | 上海宝钢工业技术服务有限公司 | The fixed online restorative procedure for tiltedly carving locating slot in rolling-mill housing memorial archway |
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| CN106695239A (en) * | 2015-11-18 | 2017-05-24 | 上海宝冶集团有限公司 | Disassembling overhauling method of mandrel of pickling-rolling uncoiling machine |
| CN109477303A (en) * | 2016-07-29 | 2019-03-15 | 福伊特专利有限公司 | The method for coating drying cylinder |
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| CN110158081A (en) * | 2019-06-21 | 2019-08-23 | 辽宁瀛寰科技有限公司 | The online method for repairing and constructing of steelmaking converter laser reinforcing |
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| CN111390494A (en) * | 2020-04-23 | 2020-07-10 | 安徽马钢重型机械制造有限公司 | Repairing device for positioning groove of side guide plate sliding seat of rolling mill and repairing method thereof |
| CN114295637A (en) * | 2021-12-31 | 2022-04-08 | 四川翔越电力线路构件有限公司 | Electric power iron tower angle steel factory detection equipment |
| CN114918611A (en) * | 2022-05-19 | 2022-08-19 | 泰尔(安徽)工业科技服务有限公司 | Repairing method for bearing seat of hot rolling large-scale rolling mill |
| CN114918611B (en) * | 2022-05-19 | 2023-10-20 | 泰尔(安徽)工业科技服务有限公司 | Repairing method for bearing seat of hot-rolled large-scale rolling mill |
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| CN104439881B (en) | 2017-02-08 |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |