CN102335805A - Method for repairing flat-head cap without liner plate - Google Patents
Method for repairing flat-head cap without liner plate Download PDFInfo
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- CN102335805A CN102335805A CN2010102371205A CN201010237120A CN102335805A CN 102335805 A CN102335805 A CN 102335805A CN 2010102371205 A CN2010102371205 A CN 2010102371205A CN 201010237120 A CN201010237120 A CN 201010237120A CN 102335805 A CN102335805 A CN 102335805A
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Abstract
The invention provides a method for repairing a flat-head cap without a liner plate. The method comprises an annealing process and a product machining process. The method is characterized by comprising the following steps: (1) annealing flat potential surfaces at two sides of the flat-head cap so as to reduce the hardness of a carburized layer to be not more than HRC30 (Rockwell hardness); (2) machining so as to remove hard surface layers of the flat potential surfaces of the flat-head cap; (3) carrying out laser cladding repair on the flat potential surfaces of the flat-head cap so as to form wear-resistant layers on the surfaces of the flat potential surfaces; and (4) carrying out product machining. By adopting the method for repairing the flat-head cap without the liner plate, the cladding layers on the surfaces of the flat-head cap have stronger wear resistance so that wear of the flat-head cap is reduced and the scrapped flat-head cap can be recovered and reused after being repaired, thus prolonging the service life of the flat-head cap.
Description
Technical field
The present invention relates to metallurgy rolling mill and use the drive apparatus field; Concrete; The present invention relates to the restorative procedure of a kind of slab finishing mill main transmission with parts; More specifically, the present invention relates to a kind of restorative procedure of the homalocephalus cover as connector between slab finishing mill roll and main shaft, restorative procedure of the present invention can reduce the wearing and tearing of homalocephalus cover (flat gesture face) and can the homalocephalus cover of scrapping be repaired after utilize again.
Background technology
In slab finishing mill main transmission, roll and main shaft are its critical pieces.And the homalocephalus cover is to be used to connect the connector between roll and the main shaft, thereby, directly bear impact from roll.Two side groundwork faces of homalocephalus cover are claimed flat gesture face, and the homalocephalus cover connects roll and main shaft through its two flat-sided gesture face.
Homalocephalus cover external form is a cylinder, and central bore is a drum type, and two planes of drum type are the flat gesture face of homalocephalus cover, the homalocephalus of flat gesture face and the working roll incompatible transmission moment of torsion that matches.The other end at the homalocephalus cover is equipped with centering ring, and end face is processed with end face tooth and connecting bolt screwed hole, is connected with connecting bolt with mill's main drive shaft, and end face tooth that homalocephalus puts and the end face tooth on the final drive shaft are meshing with each other and transmit moment of torsion.
In addition, the flat gesture face of homalocephalus cover and the homalocephalus of roll are matched in clearance, and like this, when changing roll, being convenient to the roll homalocephalus can extract out and push at every turn easily.
Homalocephalus cover as being used to connect the connector between roll and the main shaft need be installed liner plate usually on flat gesture face.On the other hand; Have the occasion that the work of refusing is turned round in bigger transmission, for example, usually; What the homalocephalus cover of 5 meters Thick Plate Plant finishing mill installations adopted is that the 17CrNiMo6 forging forms through the machined manufacturing; The heat treatment hardness at its place, flat hole is 57+4HRC, and case depth is 4.2+0.3, its specified transmission moment of torsion 5250kNm.Thereby, turn round in like this big transmission and to refuse under the occasion, for increasing the bulk strength of homalocephalus cover, often need cancel liner plate again.
The characteristics of slab finishing mill main transmission work are to start braking frequent and frequent rotating, spike, impact, obstruction and often receive suddenly the effect that (unloading) carries that adds.This by many outer unsettled operation process that causes that disturbs, big to finishing mill machinery main transmission work influence, have a strong impact on service life of finishing mill machinery main transmission.Also have a strong impact on the service life of homalocephalus cover.
For example, because the needs of roll change, overlapping between flat gesture face and roll homalocephalus at homalocephalus has bigger gap, and when the finishing mill accelerated service, these gaps are closed.Because the linear velocity of roller-way is higher than the linear velocity of roll; When biting, operation roll of mill receive workpiece front end impact and to preacceleration, thereby the gap of originally fitting is thrown off; In this moment; Rolled piece is nipped rapidly, the moment that roll-force forms operation roll of mill is slowed down and make disengagement ask that the crack is closed again, thereby produce impact shock.
At this moment, particularly especially outstanding to the influence of homalocephalus cover in the finishing mill machinery main transmission, cause homalocephalus cover service life short (usually, only being to use one-year age), failure of removal is many.
In addition, for example, heavy plate mill is a reversible mill, often forms the impact shock of rotating, and this impact shock forms homalocephalus and is enclosed within the impact torsional oscillation in the transmission process.Cause homalocephalus to overlap flat gesture surface wear aggravation, the gap becomes big vicious circle.Make the homalocephalus cover consume and increase severely, consume a large amount of spare parts purchasing expenses.
In the past, also the someone adopted the mode of common built-up welding to repair the homalocephalus cover, but had many disadvantages, and for example, common built-up welding face of weld temperature is high, can make the homalocephalus cover be heated and ftracture, and finally scraps; Because of homalocephalus overlaps flat gesture face through oozing charcoal heat treatment, the degree of depth reaches 4mm, and case hardness is high, and carbon content is high, so adopt common built-up welding can't implement at all.In addition; The homalocephalus cover of the technology reparation that is applicable in the past only is the homalocephalus cover that applies on the pot joint axle; It is to be installed on the homalocephalus of roll by interference, and flat gesture face does not have relative friction, and the surface also need not heat treatment; Just the size that the magnitude of interference is installed guarantees that the material of homalocephalus cover own is also different.Therefore this restorative procedure use occasion is limited.
Summary of the invention
For overcoming the problems referred to above; The objective of the invention is to: the restorative procedure that a kind of lining plate-free flat-head cap is provided; According to lining plate-free flat-head cap restorative procedure of the present invention; Homalocephalus overlaps flat gesture face surface deposited metal layer and has higher anti-wear performance, can reduce the wearing and tearing of homalocephalus cover (flat gesture face) and make and scrap homalocephalus cover reparation back recycling, makes the homalocephalus cover have longer service life.
Technical scheme of the present invention is following:
A kind of lining plate-free flat-head cap restorative procedure, said method comprise annealing and product manufacturing procedure, and it is characterized in that: said method step is following:
(1) homalocephalus is overlapped two flat-sided gesture faces and anneal, reducing flat gesture face carburized layer hardness to≤HRC30,
(2) machining, removing the fatigue layer that homalocephalus overlaps flat gesture face,
(3) the flat gesture face to the homalocephalus cover carries out the laser cladding reparation, forms the wearing layer of atomizing Co-based alloy powder atomizing Co-based alloy powder on flat gesture face surface,
(4) product processing.
According to lining plate-free flat-head cap restorative procedure of the present invention, it is characterized in that,
In the step 1, the said intermediate frequency that is annealed into is annealed, and said annealing temperature is the 600-650 degree.
Flat gesture surface hardness is high, directly removes very difficulty of fatigue layer, thus, cause not only can causing damage to cutter, and the cycle is long the reduction case hardness of therefore must annealing; Use the conventional annealing mode, can have influence on the precision that need not repair the position.So the present invention adopts induction coil, the intermediate frequency annealing way is adopted at the position that needs are repaired.
According to lining plate-free flat-head cap restorative procedure of the present invention, it is characterized in that,
In step 2, remove the fatigue layer that homalocephalus overlaps flat gesture face by the milling means, the fatigue layer that flat gesture face is removed in said milling is 1mm-10mm.
According to lining plate-free flat-head cap restorative procedure of the present invention, preferably,
In step 2, remove the fatigue layer that homalocephalus overlaps flat gesture face by the milling means, the fatigue layer that flat gesture face is removed in said milling is 1mm-5mm.
Thus, can obtain homalocephalus cover full intensity.
According to lining plate-free flat-head cap restorative procedure of the present invention, it is characterized in that,
In step 2, remove the fatigue layer of flat gesture face in machining after, the check dye penetrant inspection, if any crackle, then the reconditioning crackle is all removed until flat gesture face surface crack.
According to lining plate-free flat-head cap restorative procedure of the present invention, it is characterized in that,
In step (2), reset condition before reparation after the intermediate frequency annealing, after machining is removed fatigue layer, to the detection that evenly distributes of the hardness number of whole flat gesture face, requires hardness＜HRC30.
According to lining plate-free flat-head cap restorative procedure of the present invention, it is characterized in that,
Said detection method is: every individual region, promptly on the flat gesture face of per 1/4 part, divide 6 lines equally, and every line is divided 6 test points equally and is detected.So, the maximum test point of every flat-sided gesture face can reach 4*36=144 point.Certainly, according to different situations, guarantee evenly to detect situation under, said test point also can be less, for example, dozens of and even ten.
According to lining plate-free flat-head cap restorative procedure of the present invention, it is characterized in that,
In step 2, the air line distance that homalocephalus overlaps between two flat-sided gesture faces to be measured, requirement can not surpass sets size 10mm.
If record said air line distance greater than 10mm, the insufficient strength of homalocephalus cover then.
According to lining plate-free flat-head cap restorative procedure of the present invention, it is characterized in that,
In step 2, after the homalocephalus cover being carried out intermediate frequency annealing and removing fatigue layer, detect with the matrix composition of spectroscopic methodology to the flat gesture face of workpiece position, phosphorus content is controlled at 0.2%-0.3%.
According to lining plate-free flat-head cap restorative procedure of the present invention, it is characterized in that,
In step (2), the air line distance between two flat gesture faces of homalocephalus cover is measured, require to be no more than the 10mm that sets size.
Vacuum aerosolization Co-based alloy powder is adopted in said laser cladding reparation, the nickeliferous 65-75% of said Co-based alloy powder, and carbon containing 20-25% contains molybdenum, contains each 2.5-10% of chromium, and all the other are unavoidable impurities.
According to lining plate-free flat-head cap restorative procedure of the present invention, it is characterized in that,
The wear-resisting bed thickness 1-5mm of said Co-based alloy powder.
Vacuum aerosolization Co-based alloy powder is adopted in said laser cladding reparation, the nickeliferous 65-75% of said Co-based alloy powder, and carbon containing 20-25% contains molybdenum, contains each 2.5-10% of chromium, and all the other are unavoidable impurities.
According to lining plate-free flat-head cap restorative procedure of the present invention, in step 4, make, the assembling centering ring, above-mentioned centering ring is installed on a side of homalocephalus cover, promptly near the end face flank, is used for the centering effect to the working roll homalocephalus.
According to the restorative procedure of lining plate-free flat-head cap of the present invention, used 1 year through the homalocephalus of the present technique reparation machine that is enclosed within, it is 0.5mm that following machine is measured wear extent, and the new product homalocephalus cover of going up machine the same period is measured wear extent behind the machine down and is reached 4.5mm.Restorative procedure according to lining plate-free flat-head cap of the present invention; Homalocephalus cover surface deposited metal layer has higher anti-wear performance; Can reduce the wearing and tearing of homalocephalus cover and make and scrap homalocephalus cover reparation back recycling, the homalocephalus cover of reparation of the present invention has longer service life, can reach more than 6 years.
Description of drawings:
Fig. 1 is that sketch map is implemented in lining plate-free flat-head cap reparation of the present invention.
Fig. 2 is a lining plate-free flat-head cap restorative procedure main flow chart of the present invention.
Fig. 3 is about the branch flow chart (T1) of laser cladding in the lining plate-free flat-head cap restorative procedure main-process stream of the present invention.
Fig. 4 overlaps the branch flow chart (T2) of assembling detailed step about the homalocephalus after repairing in the lining plate-free flat-head cap restorative procedure main-process stream of the present invention.
Among the figure, 1. homalocephalus cover, 2. flat gesture face, 3. laser cladding head, 4. double threaded screw, 5. pressing plate, 6. nut, 7.V type base.
The specific embodiment
According to Fig. 1 structure of the present invention and principle are described, 1. homalocephalus overlap 2. flat gesture face 3. laser cladding heads 4. double threaded screws 5. pressing plates 6. nut 7.V type bases among Fig. 1.
Homalocephalus external member 1 is hung on V-type base element 7; The flat gesture face 2 that part 1 homalocephalus is overlapped through dial gauge carries out the levelness adjustment; Appliance 4 double threaded screws and part 5 pressing plate spares 6 nuts are fixed part 1 homalocephalus cover then, utilize part 3 laser cladding machines that part 1 homalocephalus is overlapped flat gesture face 2 and carry out the laser cladding reparation.
Below, according to flow chart 2, Fig. 3, Fig. 4 operating procedure of the present invention is described:
At first, remove homalocephalus and put each assembly, rust cleaning, cleaning homalocephalus cover are checked homalocephalus cover to be repaired comprehensively, confirm the reset condition (size, crackle, hardness etc.) of workpiece, flat gesture is opened a grade equidimension check; And surface colour is carried out in flat gesture position detect a flaw, determine whether to exist initial crack; Measure the hardness of flat gesture, hardness measurement adopts every individual region (the flat gesture face of 1/4 part) to divide 6 lines equally, and every line is divided 6 test points equally.Totally 144 test points.
The flat gesture surface hardness of homalocephalus cover is high, directly removes very difficulty of fatigue layer, if use the conventional annealing mode, then can have influence on the precision that need not repair the position.In the present embodiment, make induction coil, the intermediate frequency annealing way is adopted at the position (a flat-sided gesture face) that needs are repaired.Said annealing temperature is the 600-620 degree.Carry out the surface colour flaw detection again after having moved back fire, confirm whether annealing process produces the crack; Measure the hardness of flat gesture.Every individual region (the flat gesture of 1/4 part) is divided 6 lines equally, and every line is divided 6 points equally.Whether the hardness on surface as not, once more returns last process less than HRC30.
The flat gesture face hardstanding of homalocephalus cover is removed in milling, promptly removes the fatigue layer that homalocephalus overlaps flat gesture face by the milling means, and in the present embodiment, the fatigue layer thickness that flat gesture face is removed in said milling is 3mm.Check cooperates dye penetrant inspection, if any crackle, adopts the artificial rotation file reconditioning crackle of using, and all removes until surface crack.
The flat gesture face surface composition of spectroscopy measurements homalocephalus cover is mainly measured phosphorus content, if phosphorus content continues processing greater than 0.2%-0.3%, prepares for laser repairing provides technology.
Laser cladding is repaired the flat gesture face of homalocephalus cover, adopts vacuum aerosolization Co-based alloy powder.The nickeliferous 65-70% of said Co-based alloy powder, carbon containing 20-25% contains molybdenum, contains each 2.5-10% of chromium, and all the other are unavoidable impurities.Form vacuum aerosolization Co-based alloy powder wearing layer 3mm at flat gesture face.
Laser cladding mechanical performance bond strength reaches body more than 90%; That is, the bond strength of welding material and body, the bonded area of its two objects reaches more than 90%; The hardness on the flat gesture face surface of homalocephalus cover can reach about about HRC35, and the wearability on surface is superior to former workpiece; Process flat gesture by the drawing milling machine and repair the position with other.Size detection, confirm the distortion situation behind the laser cladding; Flaw detection: the surface of position dye penetrant inspection after built-up welding is repaired; Hardness test: in each individual region of flat gesture plane (the flat gesture of 1/4 part), divide 6 lines equally, every line is divided 6 points equally, detects hardness number, and above data qualifier finishes repair process.
Matrix composition to flat gesture face detects, and phosphorus content is controlled at 0.2%.
The no temperature rise in surface when the consummating function of laser cladding reparation of the present invention is the laser built-up welding does not have distortion, can not produce fire check, and molten deposited wearing layer is more wear-resisting.
Except following difference, other carry out the reparation of lining plate-free flat-head cap as embodiment 1.
The flat gesture face that needs are repaired adopts the intermediate frequency annealing way.Said annealing temperature is the 620-650 degree.The fatigue layer thickness that is overlapped flat gesture face by milling means removal homalocephalus is 5mm.The nickeliferous 70-75% of said Co-based alloy powder, carbon containing 20-25% contains molybdenum, contains each 2.5-10% of chromium, and all the other are unavoidable impurities.Form vacuum aerosolization Co-based alloy powder wearing layer 5mm at flat gesture face.
Matrix composition to flat gesture face detects, and phosphorus content is controlled at 0.3%.
Except following difference, other carry out the reparation of lining plate-free flat-head cap as embodiment 1.
The fatigue layer thickness that is overlapped flat gesture face by milling means removal homalocephalus is 4mm.The nickeliferous 70-75% of said Co-based alloy powder, carbon containing 20-25% contains molybdenum, contains each 2.5-10% of chromium, and all the other are unavoidable impurities.Form vacuum aerosolization Co-based alloy powder wearing layer 4mm at flat gesture face.
Matrix composition to flat gesture face detects, and phosphorus content is controlled at 0.3%.
According to the restorative procedure of lining plate-free flat-head cap of the present invention, used 1 year through the homalocephalus of the present technique reparation machine that is enclosed within, it is 0.5mm that following machine is measured wear extent, and the new product homalocephalus cover of going up machine the same period is measured wear extent behind the machine down and is reached 4.5mm.Restorative procedure according to lining plate-free flat-head cap of the present invention; Homalocephalus cover surface deposited metal layer has higher anti-wear performance, can reduce the wearing and tearing of homalocephalus cover and make and scrap homalocephalus cover reparation back recycling; The homalocephalus cover of reparation of the present invention has the longer service life that reaches 6 years
Claims (10)
1. lining plate-free flat-head cap restorative procedure, said method comprise annealing and product manufacturing procedure, and it is characterized in that: said method step is following:
(1) homalocephalus is overlapped two flat-sided gesture faces and anneal, reducing flat gesture face carburized layer hardness to≤HRC30,
(2) machining, removing the fatigue layer that homalocephalus overlaps flat gesture face,
(3) the flat gesture face to the homalocephalus cover carries out the laser cladding reparation, forms the molten wearing layer that applies of atomizing Co-based alloy powder atomizing Co-based alloy powder on flat gesture face surface,
(4) product processing.
2. lining plate-free flat-head cap restorative procedure as claimed in claim 1 is characterized in that,
In step (1), the said intermediate frequency that is annealed into is annealed, and said annealing temperature is the 600-650 degree.
3. lining plate-free flat-head cap restorative procedure as claimed in claim 1 is characterized in that,
In step (2), remove the fatigue layer that homalocephalus overlaps flat gesture face by the milling means, the fatigue layer that flat gesture face is removed in said milling is 1mm-10mm.
4. lining plate-free flat-head cap restorative procedure as claimed in claim 3 is characterized in that,
The fatigue layer that flat gesture face is removed in said milling is 1mm-5mm.
5. lining plate-free flat-head cap restorative procedure as claimed in claim 1 is characterized in that,
In step (2), after machining is removed fatigue layer, check dye penetrant inspection, if any crackle, then the reconditioning crackle is all removed until surface crack.
6. lining plate-free flat-head cap restorative procedure as claimed in claim 1 is characterized in that,
In step (2), reset condition before reparation after the intermediate frequency annealing, after machining is removed fatigue layer, to the detection that evenly distributes of the hardness number of whole flat gesture face, requires hardness＜HRC30.
7. lining plate-free flat-head cap restorative procedure as claimed in claim 1 is characterized in that,
In step (2), the air line distance between two flat gesture faces of homalocephalus cover is measured, require to be no more than the 10mm that sets size.
8. lining plate-free flat-head cap restorative procedure as claimed in claim 1 is characterized in that,
In step (2), after the homalocephalus cover being carried out intermediate frequency annealing and removing fatigue layer, detect with the matrix composition of spectroscopic methodology to flat gesture face, phosphorus content is controlled at 0.2%-0.3%.
9. lining plate-free flat-head cap restorative procedure as claimed in claim 1 is characterized in that,
Vacuum aerosolization Co-based alloy powder is adopted in said laser cladding reparation, the nickeliferous 65-75% of said Co-based alloy powder, and carbon containing 20-25% contains molybdenum, contains each 2.5-10% of chromium, and all the other are unavoidable impurities.
10. lining plate-free flat-head cap restorative procedure as claimed in claim 1 is characterized in that,
The molten deposited wear-resisting bed thickness 1-5mm of said Co-based alloy powder.
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| CN 201010237120 CN102335805B (en) | 2010-07-26 | 2010-07-26 | Method for repairing flat-head cap without liner plate |
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| CN 201010237120 CN102335805B (en) | 2010-07-26 | 2010-07-26 | Method for repairing flat-head cap without liner plate |
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Cited By (5)
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| CN102335808A (en) * | 2010-07-27 | 2012-02-01 | 宝山钢铁股份有限公司 | Method for finishing flat potential surfaces of flat-head cap of roll |
| CN102794598A (en) * | 2012-06-28 | 2012-11-28 | 宝钢不锈钢有限公司 | Maintenance method of valve core gap attrition quantity of hydraulic slide valve |
| CN102873496A (en) * | 2012-09-11 | 2013-01-16 | 宝钢不锈钢有限公司 | Lossless and uniform diameter-expanding method |
| CN108115351A (en) * | 2016-11-30 | 2018-06-05 | 宝山钢铁股份有限公司 | A kind of flat head sleeve repair method of bores |
| CN111020563A (en) * | 2019-12-11 | 2020-04-17 | 安徽泰尔表面工程技术有限公司 | Remanufacturing method for direct laser cladding of failure carburized and quenched part |
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| CN101422850A (en) * | 2007-11-01 | 2009-05-06 | 宝钢集团上海梅山有限公司 | Flat-head cap build-up welding repair method |
| CN101890609A (en) * | 2009-05-18 | 2010-11-24 | 上海宝钢设备检修有限公司 | Method for repairing lining plate-free flat-head cap of spindle of rolling mill |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102335808A (en) * | 2010-07-27 | 2012-02-01 | 宝山钢铁股份有限公司 | Method for finishing flat potential surfaces of flat-head cap of roll |
| CN102335808B (en) * | 2010-07-27 | 2013-09-04 | 宝山钢铁股份有限公司 | Method for finishing flat potential surfaces of flat-head cap of roll |
| CN102794598A (en) * | 2012-06-28 | 2012-11-28 | 宝钢不锈钢有限公司 | Maintenance method of valve core gap attrition quantity of hydraulic slide valve |
| CN102873496A (en) * | 2012-09-11 | 2013-01-16 | 宝钢不锈钢有限公司 | Lossless and uniform diameter-expanding method |
| CN108115351A (en) * | 2016-11-30 | 2018-06-05 | 宝山钢铁股份有限公司 | A kind of flat head sleeve repair method of bores |
| CN111020563A (en) * | 2019-12-11 | 2020-04-17 | 安徽泰尔表面工程技术有限公司 | Remanufacturing method for direct laser cladding of failure carburized and quenched part |
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|---|---|
| CN102335805B (en) | 2013-04-24 |
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