CN102335805B - 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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- CN102335805B CN102335805B CN 201010237120 CN201010237120A CN102335805B CN 102335805 B CN102335805 B CN 102335805B CN 201010237120 CN201010237120 CN 201010237120 CN 201010237120 A CN201010237120 A CN 201010237120A CN 102335805 B CN102335805 B CN 102335805B
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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 a kind of Thick Plate Fine mill main drive system restorative procedure of parts, more specifically, the present invention relates to a kind of restorative procedure as the flat head sleeve of connector between Thick Plate Fine rolling mill roll and main shaft, restorative procedure of the present invention can reduce the wearing and tearing of flat head sleeve (flat gesture face) and can will recycle after the flat head sleeve reparation of scrapping.
Background technology
In the Thick Plate Fine mill main drive system, roll and main shaft are its critical pieces.And flat head sleeve is for the connector that connects between roll and the main shaft, thereby, directly bear the impact from roll.Two side groundwork faces of flat head sleeve claim flat gesture face, and flat head sleeve connects roll and main shaft by its two flat-sided gesture face.
The flat head sleeve external form is cylinder, and central inner hole is drum type, and two planes of drum type are the flat gesture face of flat head sleeve, the homalocephalus of flat gesture face and the working roll incompatible transmitting torque that matches.The other end at flat head sleeve is equipped with centering ring, and end face is processed with end-tooth and connecting bolt screwed hole, is connected with connecting bolt with mill's main drive shaft, and the end-tooth on the flat head sleeve and the end-tooth on the final drive shaft be intermeshing to come transmitting torque.
In addition, the flat gesture face of flat head sleeve and the homalocephalus of roll are matched in clearance, and like this, being convenient to roller palm when each replacing roll can extract out and push easily.
Usually need to liner plate be installed at flat gesture face as the flat head sleeve that is used for the connector between connection roll and the main shaft.On the other hand, has larger transmission and turning round the occasion of the work of refusing, for example, usually, what the flat head sleeve 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 transmitting torque 5250kNm.Thereby, turn round in like this large transmission and to refuse under the occasion, for increasing the bulk strength of flat head sleeve, often need to cancel again liner plate.
The characteristics of Thick Plate Fine mill main drive system work are to start braking frequent and frequent rotating, spike, impact, obstruction and often added suddenly the effect that (unloading) carries.This unsettled operation process that is caused by many outer interference, large 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 flat head sleeve.
For example, because the needs of roll change have larger gap between the flat gesture face of flat head sleeve and roller palm, 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 be subject to 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 again closed, thereby produce impact shock.
At this moment, particularly especially outstanding on the impact of flat head sleeve in the finishing mill machinery main transmission, cause flat head sleeve service life short (usually, only being to use one-year age), failure of removal is many.
In addition, for example, heavy plate mill is reversible mill, often forms the impact shock of rotating, and this impact shock forms the impact torsional oscillation of flat head sleeve in transmission process.Cause the flat gesture surface wear aggravation of flat head sleeve, the gap becomes large vicious circle.So that flat head sleeve consumption increases 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 flat head sleeve, but had many disadvantages, and for example, common built-up welding face of weld temperature is high, can make flat head sleeve be heated and ftracture, and finally scraps; Ooze charcoal heat treatment because of the flat gesture face process of flat head sleeve, 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 flat head sleeve that conventional art was applicable to repair only is the flat head sleeve that applies on the pot joint axle, it is to be installed on the homalocephalus of roll by interference, flat gesture face is without relative friction, the surface also need not heat treatment, be an Assurance of Size that the magnitude of interference is installed, the material of flat head sleeve own is also different.Therefore this restorative procedure use occasion is limited.
Summary of the invention
For overcoming the problems referred to above, the object of the invention is to: the restorative procedure that a kind of lining plate-free flat-head cap is provided, according to method for repairing flat-head cap without liner plate of the present invention, the flat gesture face of flat head sleeve surface deposited metal layer has higher anti-wear performance, can reduce the wearing and tearing of flat head sleeve (flat gesture face) and make and scrap recycling after the flat head sleeve reparation, so that flat head sleeve has longer service life.
Technical scheme of the present invention is as follows:
A kind of method for repairing flat-head cap without liner plate, described method comprise annealing and product manufacturing procedure, and it is characterized in that: described method step is as follows:
(1) flat head sleeve two flat-sided gesture faces are annealed, reducing flat gesture face carburized layer hardness to≤HRC30,
(2) machining, with the fatigue layer of the flat gesture face of removal flat head sleeve,
(3) the flat gesture face of flat head sleeve is carried 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 method for repairing flat-head cap without liner plate of the present invention, it is characterized in that,
In the step 1, the described intermediate frequency that is annealed into is annealed, and described annealing temperature is the 600-650 degree.
Flat gesture surface hardness is high, and it is very difficult directly to remove 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 does not need to repair the position.So the present invention adopts induction coil, the intermediate frequency annealing way is adopted at the position that needs are repaired.
Step 1 adopts the intermediate frequency annealing process, reduce need built-up welding repair the hardness number at position (hardness by 54+4HRC be reduced to≤HRC30), the flat gesture face position of need annealing is divided into two sides because of it, segmentation is carried out, and, carries out at twice annealing in process that is.
According to method for repairing flat-head cap without liner plate of the present invention, it is characterized in that,
In step 2, by the fatigue layer of the flat gesture face of milling means removal flat head sleeve, the fatigue layer that flat gesture face is removed in described milling is 1mm-10mm.
According to method for repairing flat-head cap without liner plate of the present invention, preferably,
In step 2, by the fatigue layer of the flat gesture face of milling means removal flat head sleeve, the fatigue layer that flat gesture face is removed in described milling is 1mm-5mm.
Thus, can obtain the sufficient intensity of flat head sleeve.
According to method for repairing flat-head cap without liner plate of the present invention, it is characterized in that,
In step 2, remove the fatigue layer of flat gesture face in machining after, check dye penetrant inspection, if any crackle, reconditioning crackle then is until flat gesture face surface crack is all removed.
According to method for repairing flat-head cap without liner plate 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 method for repairing flat-head cap without liner plate of the present invention, it is characterized in that,
Described detection method is: every individual region, namely divide 6 lines equally at the flat gesture face of per 1/4 part, 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, described test point also can be less, for example, dozens of and even ten.
According to method for repairing flat-head cap without liner plate of the present invention, it is characterized in that,
In step 2, the air line distance between flat head sleeve two flat-sided gesture faces to be measured, requirement can not surpass sets size 10mm.
If record described air line distance greater than 10mm, then the insufficient strength of flat head sleeve.
According to method for repairing flat-head cap without liner plate of the present invention, it is characterized in that,
In step 2, after flat head sleeve 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 method for repairing flat-head cap without liner plate of the present invention, it is characterized in that,
In step (2), the air line distance between two flat gesture faces of flat head sleeve is measured, require to be no more than the 10mm that sets size.
Vacuum aerosolization Co-based alloy powder is adopted in described laser cladding reparation, the nickeliferous 65-75% of described Co-based alloy powder, and carbon containing 20-25% contains molybdenum, contains each 2.5-10% of chromium, and all the other are inevitable impurity.
According to method for repairing flat-head cap without liner plate of the present invention, it is characterized in that,
The wear-resisting bed thickness 1-5mm of described Co-based alloy powder.
Vacuum aerosolization Co-based alloy powder is adopted in described laser cladding reparation, the nickeliferous 65-75% of described Co-based alloy powder, and carbon containing 20-25% contains molybdenum, contains each 2.5-10% of chromium, and all the other are inevitable impurity.
According to method for repairing flat-head cap without liner plate of the present invention, in step 4, make, the assembling centering ring, above-mentioned centering ring is installed on a side of flat head sleeve, namely near the end face flank, is used for the certralizing ability to the working roll homalocephalus.
According to the restorative procedure of lining plate-free flat-head cap of the present invention, the flat head sleeve of repairing through present technique used 1 year at machine, and it is 0.5mm that lower machine is measured wear extent, and the same period upper machine the new product flat head sleeve under measure wear extent behind the machine and reach 4.5mm.Restorative procedure according to lining plate-free flat-head cap of the present invention, flat head sleeve surface deposited metal layer has higher anti-wear performance, can reduce the wearing and tearing of flat head sleeve and make and scrap recycling after the flat head sleeve reparation, the flat head sleeve of reparation of the present invention has longer service life, can reach more than 6 years.
Description of drawings:
Fig. 1 is that schematic diagram is implemented in lining plate-free flat-head cap reparation of the present invention.
Fig. 2 is method for repairing flat-head cap without liner plate main flow chart of the present invention.
Fig. 3 is about minute flow chart (T1) of laser cladding in the method for repairing flat-head cap without liner plate main-process stream of the present invention.
Fig. 4 is minute flow chart (T2) of assembling detailed step in the method for repairing flat-head cap without liner plate main-process stream of the present invention about the flat head sleeve after repairing.
Among the figure, 1. flat head sleeve, 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. flat head sleeves, 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, by dial gauge the flat gesture face 2 of part 1 flat head sleeve is carried out Level-adjusting, then appliance 4 double threaded screws and part 5 pressing plate spares 6 nuts are fixed part 1 flat head sleeve, utilize part 3 laser cladding machines that the flat gesture face 2 of part 1 flat head sleeve is carried 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 each assembly on the flat head sleeve, rust cleaning, cleaning flat head sleeve check flat head sleeve to be repaired comprehensively, determine 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 flat head sleeve is high, and it is very difficult directly to remove fatigue layer, if use the conventional annealing mode, then can have influence on the precision that does not need to 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.Described annealing temperature is the 600-620 degree.Carry out again the surface colour flaw detection 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 no, again returns last process less than HRC30.
The flat gesture face hardstanding of flat head sleeve is removed in milling, is namely removed the fatigue layer of the flat gesture face of flat head sleeve by the milling means, and in the present embodiment, the fatigue layer thickness that flat gesture face is removed in described milling is 3mm.Check cooperates dye penetrant inspection, if any crackle, adopts artificial with rotary file reconditioning crackle, until surface crack is all removed.
The flat gesture face surface composition of spectroscopy measurements flat head sleeve 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 flat head sleeve, adopts vacuum aerosolization Co-based alloy powder.The nickeliferous 65-70% of described Co-based alloy powder, carbon containing 20-25% contains molybdenum, contains each 2.5-10% of chromium, and all the other are inevitable impurity.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 two object reaches more than 90%, the hardness on the flat gesture face surface of flat head sleeve can reach about about HRC35, and the wearability on surface is better than former workpiece; Process flat gesture and other reparation position by the drawing milling machine.Size detection, determine the deformation 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 surface without distortion, can not produce fire check without temperature rise when the consummating function of laser cladding reparation of the present invention was the laser built-up welding, and deposited wearing layer is more wear-resisting.
Embodiment 2
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.Described annealing temperature is the 620-650 degree.The fatigue layer thickness of being removed the flat gesture face of flat head sleeve by the milling means is 5mm.The nickeliferous 70-75% of described Co-based alloy powder, carbon containing 20-25% contains molybdenum, contains each 2.5-10% of chromium, and all the other are inevitable impurity.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%.
Embodiment 3
Except following difference, other carry out the reparation of lining plate-free flat-head cap as embodiment 1.
The fatigue layer thickness of being removed the flat gesture face of flat head sleeve by the milling means is 4mm.The nickeliferous 70-75% of described Co-based alloy powder, carbon containing 20-25% contains molybdenum, contains each 2.5-10% of chromium, and all the other are inevitable impurity.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, the flat head sleeve of repairing through present technique used 1 year at machine, and it is 0.5mm that lower machine is measured wear extent, and the same period upper machine the new product flat head sleeve under measure wear extent behind the machine and reach 4.5mm.Restorative procedure according to lining plate-free flat-head cap of the present invention, flat head sleeve surface deposited metal layer has higher anti-wear performance, can reduce the wearing and tearing of flat head sleeve and make and scrap recycling after the flat head sleeve reparation,, the flat head sleeve of reparation of the present invention has the longer service life that reaches 6 years.
Claims (9)
1. method for repairing flat-head cap without liner plate, described method comprise annealing and product manufacturing procedure, and it is characterized in that: described method step is as follows:
(1) flat head sleeve two flat-sided gesture faces are annealed, reducing flat gesture face carburized layer hardness to≤HRC30, describedly be annealed into intermediate frequency annealing, described annealing temperature is the 600-650 degree,
(2) machining, with the fatigue layer of the flat gesture face of removal flat head sleeve,
(3) the flat gesture face of flat head sleeve carried out the laser cladding reparation, forms the deposited wearing layer of atomizing Co-based alloy powder on flat gesture face surface,
(4) product processing.
2. method for repairing flat-head cap without liner plate as claimed in claim 1 is characterized in that,
In step (2), by the fatigue layer of the flat gesture face of milling means removal flat head sleeve, the fatigue layer that flat gesture face is removed in described milling is 1mm-10mm.
3. method for repairing flat-head cap without liner plate as claimed in claim 2 is characterized in that,
The fatigue layer that flat gesture face is removed in described milling is 1mm-5mm.
4. method for repairing flat-head cap without liner plate 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, reconditioning crackle then is until surface crack is all removed.
5. method for repairing flat-head cap without liner plate 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.
6. method for repairing flat-head cap without liner plate as claimed in claim 1 is characterized in that,
In step (2), the air line distance between two flat gesture faces of flat head sleeve is measured, require to be no more than the 10mm that sets size.
7. method for repairing flat-head cap without liner plate as claimed in claim 1 is characterized in that,
In step (2), after flat head sleeve 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%.
8. method for repairing flat-head cap without liner plate as claimed in claim 1 is characterized in that,
Vacuum aerosolization Co-based alloy powder is adopted in described laser cladding reparation, the nickeliferous 65-75% of described Co-based alloy powder, and carbon containing 20-25% contains molybdenum, contains each 2.5-10% of chromium, and all the other are inevitable impurity.
9. method for repairing flat-head cap without liner plate as claimed in claim 1 is characterized in that,
The deposited wear-resisting bed thickness 1-5mm of described 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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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111020563B (en) * | 2019-12-11 | 2022-01-04 | 泰尔(安徽)工业科技服务有限公司 | Remanufacturing method for direct laser cladding of failure carburized and quenched part |
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| DE102005048781B3 (en) * | 2005-10-12 | 2006-11-30 | Thomas Gerd Pohl | Repairing a worn bore for receiving a roller bearing comprises widening the bore, inserting a coaxial sleeve and injecting a hardenable material into the gap between the sleeve and bore |
| 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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2010
- 2010-07-26 CN CN 201010237120 patent/CN102335805B/en active Active
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| US5136766A (en) * | 1991-02-07 | 1992-08-11 | National Roll Inc | Rolling mill sleeve |
| RU2155658C1 (en) * | 1998-12-16 | 2000-09-10 | Костромская государственная сельскохозяйственная академия | Method for restoring worn surfaces of parts by shifting local volumes of metal |
| DE102005048781B3 (en) * | 2005-10-12 | 2006-11-30 | Thomas Gerd Pohl | Repairing a worn bore for receiving a roller bearing comprises widening the bore, inserting a coaxial sleeve and injecting a hardenable material into the gap between the sleeve and bore |
| 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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